CIRCUIT
PROTECTION
SOLUTIONS
Electronics Circuit Protection
Product Selection Guide
A guide to selecting Littelfuse circuit protection
components for electronic applications.
Broadest and Deepest
Portfolio of Product
Backed by Unparalleled
Circuit Protection
Expertise
Topic Page
Littelfuse Circuit Protection Technologies 2–3
Overcurrent Protection Technologies
Fuses 4–5
Fuseholders 6
Positive Temperature Coefficient Devices (PTCs) 7
Overvoltage Suppression Protection
Varistors (MOVs, MLVs) 8
Gas Discharge Tubes (GDTs) 9
PulseGuard® ESD Supressors 9
TVS Diodes 10–11
TVS Diode Array
SPA® Diodes 12
PLED Light-Emitting Diode (LED) Protectors 13
SIDACtor® Protection Thyristors 14–15
Switching Thyristors 16–17
Common Circuit Threats and Protection Solutions 18–19
Application Solutions by Circuit Type and Related Threat 20–23
About this guide
This guide provides a summary of key circuit protection consideration factors, descriptions
of the technologies Littelfuse offers, and product selection tables. It is designed to help you
quickly find a protection solution appropriate to your application.
Specifications descriptions and illustrative material in this literature are as accurate as known at the time of publication,
but are subject to changes without notice. Visit littelfuse.com for more information.
©2015 Littelfuse, Inc.
littelfuse.com
WHY CHOOSE CIRCUIT PROTECTION
Circuit protection devices interrupt overcurrent events and divert
overvoltage transients. They increase safety and enable end
products to survive harsh electrical conditions.
Most electrical and electronic equipment require circuit protection
devices. In many cases they must be installed to comply with safety
and performance standards before the end products can be sold
or used.
Beyond this, strategically-selected protection devices will:
• Improve end-product uptime, sustainability and reliability
• Assure low warranty return, repair and replacement costs
• Minimize fire and shock risks and larger damage potential
• Minimize operating dangers and potential liabilities
WHY CHOOSE LITTELFUSE
Littelfuse is the global leader in circuit protection solutions.
We are the only company to offer all of the pertinent circuit
protection technologies, with products that can be used in
virtually everything that uses electrical energy.
Complementing our wide portfolio of circuit protection products
is a global network of design and technical support expertise.
We offer decades of design experience to help you address
application challenges and achieve regulatory compliance.
Your Single Source
Littelfuse offers an extensive circuit protection product line.
We design forward-thinking, application-specific solutions to
provide assurance that your most demanding requirements will
be met. Our goal is to provide the most complete range of options
so that you will not have to make compromises.
Testing Support
Littelfuse can help assure that your products will withstand most
common threats repeatedly and will fail safely under extreme
circumstances. We can serve as an independent source to provide
assistance as you design by offering lab testing capabilities for
customer applications. This testing includes industry specific
required power fault and ESD/EFT/lightning surge conditions.
Application Knowledge
For over 85 years, Littelfuse has maintained a focus on circuit protection,
and we will continue to adapt as technologies evolve. Engineers and
circuit designers around the world have come to rely on Littelfuse
products and application knowledge to support their designs.
Global Support
Littelfuse products, application knowledge and technical support are
available around the globe. We offer a network of regional customer
support offices and hundreds of independent authorized distributor
contacts to assist you. Visit www.littelfuse.com/contact-us to find local
support near you.
Standards Compliance Expertise
Most Littelfuse products comply with a wide range of applicable industry
and government guidelines, as well as our own rigorous quality and
reliability criteria. We continually look forward and adapt to changing
requirements, so that our products will comply with industry specific,
national and international standards such as CCC, CSA, IEC, IEEE, ISO,
ITU, Meti, RoHs, Telcordia, TIA and many more.
FOR FURTHER GUIDANCE
Littelfuse product representatives will work with you to find circuit
protection technologies that will meet your requirements.
To address your requirements or questions in detail, please contact
a representative near you (Littelfuse.com/contact-us).
For reference diagrams, technical articles, and other application
guidance materials to assist in your design processes, please visit
Littelfuse.com/designsupport
For detailed selection of Littelfuse circuit protection technologies
and their common applications, please visit Littelfuse.com/products
For a library of detailed application guides, please visit
Littelfuse.com/technical-resources/application-designs
To download the most current edition of this brochure and our product
catalogs, please visit Littelfuse.com/catalogs
Littelfuse
Circuit Protection
Technologies
Technology
Key Features
and Protection
Characteristics
When / Where
Typically Used
Surge Energy
Rating Range
Typical Voltage
Clamping
Speeds
Typical
Capacitance/
Insertion Loss
Mounting/
Size/Packaging
Options
Overcurrent Protection Technologies:
Fuses
Completely stop current flow,
which helps to identify faults;
Wide range of options
Ultimate protection for sensitive/
expensive/critical components Low thru Very High Not applicable Series impedance
measured in nH
Very Extensive Range
of Options
PTCs
Resettable; No device
replacement after most
common overcurrent events
Where overcurrent events may
occur often, and continuous uptime
desired
Low thru High Not applicable Series resistance
measured in ohms
Surface Mount, Radial
Leaded, Axial Strap
Overvoltage Suppression Technologies:
Multi-Layer
Varistors (MLVs)
Compact and capable of handling
significant surges for their size
ESD and EFT suppression in
smaller and portable electronics Low thru Medium Moderate High Miniature
Surface Mount
Metal-Oxide
Varistor (MOVs)
Capable of withstanding very
high energy transients;
Wide range of options
Appliance, industrial and very high
energy suppression applications
Medium thru
Very High Moderate High Radial Leaded,
Industrial Terminal
GDTs
Switches that turn to on state and
shunt overvoltage to ground using a
contained inert gas as an insulator
Protection of
telecom equipment
from lightning surges
Medium thru High Fast Low
Surface Mount, Axial
Leaded,
2/3 Lead Radial
PulseGuard®
ESD Suppressors
Extremely low capacitance;
Fast response time;
Compact size
ESD suppression;
Ultra fast reaction;
Low signal distortion
Low Moderate Low Miniature
Surface Mount
PLED LED
Protectors
Shunt function bypasses open
LEDs; ESD and reverse power
protection
High brightness outdoor
LED lighting applications Low Very Fast Medium Miniature
Surface Mount
TVS Diode Array
SPA® Diodes
Low capacitance /
low clamping voltage;
Compact size
ESD suppression; Low distortion;
Ideal for I/O interfaces and digital &
analog signal lines
Low thru Medium Very Fast Low Extensive range of
surface mount options
TVS Diodes
Fast response to
fast transients;
Wide range of options
Semiconductor protection;
telecom I/O interfaces, electronics,
industrial equipment
Medium thru High Fast High Axial Leaded, Radial
Leaded, Surface Mount
SIDACtor®
Protection
Thyristors
Specifically designed to
serve stringent telecom/
networking standards
Telecom / Datacom and
networking applications Medium thru High Very Fast Low
Extensive range of
surface mount and
thru-hole options
Switching Technologies:
Power Thyristors
Solid state switches that switch
to low “on” state and control the
flow of current
Home appliances, power tools,
outdoor equipment Not applicable Not applicable Not applicable
Extensive range of
surface mount and
thru-hole options
littelfuse.com
1. Fuses and Holders —
Fuses– Full range including
surface mount, axial, glass or
ceramic, thin-film or Nano2®
style, fast-acting or Slo-Blo®
fuse.
Clips– Used in applications
that require a fuse to be
easily mounted to a PCB, but
real-estate is scarce. Clips
are also ideal for high-current
applications, allowing for
better heat management of
the fuse. They are the most
economical solution.
Blocks– An alternative solution
to Clips but with easier
placement on the PC board
during manufacturing. In some
instances, Blocks may provide
insulation to the side ears of
the clips. In addition to being
through-hole, Blocks can also
be screwed or riveted in place.
Holders– The ideal solutions for
those applications that require
the cartridge fuse to be
protected, providing a shock-
safe environment. Panel-
mount holders allow for easy
replacement of the fuse from
outside of the appliance,
perfect for applications that
require replacing the fuse
without opening the appliance
enclosure. (Pages 4-6).
2. Positive Temperature
Coefficient Devices (PTCs) —
Provide resettable overcurrent
protection for a wide range of
applications (Page 7).
3. Varistors — Multiple forms,
from Metal Oxide Varistors
(MOVs) and Thermally Protected
MOV (TMOV® varistors) that
suppress lightning transient
voltages to Multi-Layer Varistors
(MLVs) designed for applications
requiring protection from various
ESD/EFT transients in computers
and handheld devices as well
as industrial and automotive
applications (Page 8).
4. Gas Discharge Tubes
(GDTs) — Available in small
footprint leaded and surface
mount configurations, Littelfuse
GDTs respond fast to transient
overvoltage events, reducing
the risk of equipment damage
(Page 9)
.
5. PulseGuard® ESD
Suppressors — Available in
various surface mount form
factors to protect high-speed
digital lines without causing
signal distortion (Page 9).
6. TVS Diodes — Suppress
overvoltage transients such as
Electrical Fast Transients (EFT),
inductive load switching and
lightning in a wide variety of
applications in the computer,
industrial, telecom and
automotive markets (Pages 10 –11).
7. TVS Diode Array –
SPA® Diodes —Designed
specifically to protect analog
and digital signal lines
from electrostatic discharge
(ESD) and other overvoltage
transients such as EFT and
Lightning (Page 12).
8. PLED Bypass Protectors —
Specialty silicon devices that
enable LED lighting strings
to continue to function if any
single LED fails as an open
circuit, and also offer ESD and
reverse power protection
(Page 13).
9. SIDACtor® Protection
Thyristors — Complete line of
protection thyristor products
specifically designed to
suppress overvoltage transients
in a broad range of telecom and
datacom applications
(Pages 14 –15).
10. Switching Thyristors —
Solid-state switches used to
control the flow of electrical
current in applications, capable
of withstanding rated blocking/
off-state voltage until triggered
to the on-state (Pages 16–17).
1
58
7
2
3
4
10
6
9
Overcurrent Protection Technologies Product
Specifications and
Selection Guide
FUSE PRODUCTS
Fuses provide protection by completely stopping the flow of energy to sensitive circuits. If current exceeds the fuse’s operating range, the metal
wire or strip melts safely within an enclosure. Littelfuse offers the most extensive range of fuses available, and for easy replacement of cartridge
fuses Littelfuse offers a wide selection of fuseholders including panel mount, in-line, and surface and thru-hole circuit board mount devices.
See page 6 for fuseholder selection.
(1) Detailed information about most product series listed here can be found on our web site.
(2) Size for these surface mount items refers to common industry length and width dimensions of the device surface area. Example: 0402 = .04” x .02”
(3) In some cases for these categories the ratings, agency approvals and specifications vary by part number and are presented here as ranges representing the whole series.
Please refer to product data on www.littelfuse.com and in our data sheets for detailed information by part number.
* Please refer to data sheet for detailed specifications.
Series
Name1
View Datasheet
Order Samples
Size2
Time Lag
Fast Acting
Very Fast Acting
Device Range 3
(Operating
Current Options
in Amps)
Max. Voltage
Rating 3
(Volts)
Interrupting
Rating at
Max. Voltage
Rating 3
(Amps)
Operating
Temperature
Range
Agency
Approvals 3
Halogen Free
RoHS Compliant
Lead Free
UL
UR
CSA
PSE
UMF
Surface Mount:
Ceramic Chip
437 • • 1206 •0.25 - 8 125 / 63 / 32 50
-55°C to +150°C
• • • •
438 • • 0603 •0.25 - 6 32 / 24 50 • • • •
440 • • 1206 •1.75 - 8 32 50 •• •••
441 • • 0603 •2 - 6 32 50 •• •••
469 • • 1206 •1 - 8 24 / 32 24 - 63 •• •••
501 • • 1206 •10, 12, 15, 20 32 150 • • • •
Thin Film
466 • • 1206 •0.125 - 5 125 / 63 / 32 50
-55°C to +90°C
• • • •
429 • • 1206 •7 24 35 • • • •
468 • • 1206 •0.5 - 3 63 / 32 35 - 50 •• •••
467 • • 0603 •0.25 - 5 32 35 - 50 •• •••
494 • • 0603 •0.25 - 5 32 35 - 50 •• •••
435 • • 0402 •0.25 - 5 32 35 •• •••
Nano2® Fuse
448 • • 2410 •0.062 - 15 125 / 65 35 - 50
-55°C to +125°C
••• ••
449 • • 2410 •0.375 - 5 125 50 ••• ••
451 / 453 •2410 •0.062 - 15 125 / 65 35 - 50 •••• ••
452 / 454 •2410 •0.375 - 12 125 / 72 50 ••• ••
456 • • 4012 •20, 25, 30, 40 125 100 • • •
458 • • 1206 •1.0 - 10 75 / 63 50 • • •
443 • • 4012 •0.5 - 5 250 50 • • •
464 • • 4818 •0.5 - 6.3 250 100 ••••
465 • • 4818 •1 - 6.3 250 100 ••••
462 • • 4118 •0.500 - 5 350 100 -40°C to +80°C • • •
485 • • 4818 •0.500 - 3.15 600 100 -55°C to +125°C • • •
Telelink® Fuse 461 • • 4012 0.5 - 2.0 600 60 -55°C to +125°C
• • • •
461E 4012 1.25 600 60 • • •
OMNI-BLOK®
Fuseholder
154 • • *•0.062 - 10.0 125 35 - 50 -55°C to +125°C
• • •
154T *•0.375 - 5 125 50 • • •
Fuse and Clip
Assemblies
157 *•0.062 - 10 125 35 - 50
-55°C to +125°C
• • •
157T *•0.375 - 5 125 50 • • •
159 • • *0.5 - 2 600 60 • • •
160 *•0.5 - 5 250 50 • • •
PICO® SMF
Fuse
459 • • *•0.062 - 5 125 50 - 300 -55°C to +125°C
• •
460 • • *•0.5 - 5 125 50 • •
Flat Pak 202 • • *•0.062 - 5 250 50 -55°C to +125°C
• •
203 • • *•0.25 - 5 250 50 • •
EBF 446 • • *•2.0 - 10.0 350 100 -40°C to +125°C
• •
447 • • *•2.0 - 10.0 350 100 • •
littelfuse.com
Series
Name1
View Datasheet
Order Samples
Time Lag
Medium Acting
Fast Acting
Very Fast Acting
Device
Range 3
(Operating
Current
Options in
Amps)
Max. Voltage
Rating 3
(Volts)
Interrupting
Rating at
Max Voltage
Rating 3
(Amps)
Operating
Temperature
Range
Agency Approvals 3
RoHS Compliant
Lead Free
Americas Europe Asia
UL
UR
CSA
QPL
UMF
CE
VDE
TUV
BSI
Semko
PSE
K
CCC
CQC
Radial Leaded / Socket:
Micro™
Fuse /
TR3 Fuse
262/268 • •• •0.002 - 5 125 10,000 -55°C to +125°C • • •
269 ••0.002 - 5 125 10,000 -55°C to +125°C • • • •
272/278 • •• •0.002 - 5 125 10,000 -55°C to +125°C • • •
273/279 • •• •0.002 - 5 125 10,000 -55°C to +85°C • • •
274 ••0.002 - 5 125 10,000 -55°C to +85°C • •
303 • • •0.5 - 5 125 50 -55°C to +70°C • • • • •
TR5®
Fuse
370 • • •0.4 - 6.3 250 35 - 50
-40°C to +85°C
• • • • • • • •
372 • • •0.4 - 6.3 250 35 - 50 • • • • • • • • • •
373 • • •0.5 - 10 250 50 • • • • •
374 • • •0.5 - 10 250 50 • • • • •
382 • • •1 - 10 250 100 • • • • • • • • • •
383 • • •1 - 10 300 50 - 100 • • • • • •
TE5
369 • • •1 - 6.3 300 50
-40°C to +85°C
• • • • •
385 • • •0.35 - 1.5 125 50 • • • •
391 • • •0.125 - 4 65 50 • • • •
392 • • •0.8 - 6.3 250 25 - 63 • • • • • • • • •
395 • • •0.05 - 6.3 125 100 • • • •
396 • • •0.05 - 6.3 125 100 • • • • •
397 • • •0.35 - 1.5 125 50 • • • •
398 • • •0.125 - 4 65 50 • • • •
399 • • •0.125 - 4 65 50 • • • •
400 • • •0.5 - 6.3 250 130 • • • • • •
804 • • •0.8 - 6.3 250 150 -40°C to +125°C • • • • • • • •
808 • • •2 - 5 250 100 -40°C to +85°C • • • •
TE7 807 • • •0.8 - 6.3 300 100 -40°C to +125°C • • • • • • • •
Axial Leaded / Cartridge:
PICO®
Fuse /
PICO® II
Fuse Axial
251 • • •0.062 - 15 125 300DC / 50AC
-55°C to +125°C
• • • • • •
253 • • •0.062 - 15 125 300DC / 50AC • • • • •
275 • • •20 - 30 32 300DC / 50AC • • •
263 • • •0.062 - 5 250 50 • • • • •
471 • • •0.5 - 5 125 50 • • • • •
472 • • •0.5 - 5 125 50 • • •
473 • • •0.375 - 7 125 50 • • • • •
265/266/267 •
•••
•0.062 - 15 125 300DC / 50AC • • • • •
3.6x10 mm
874 • • •0.1 - 10 250 50
-55°C to +125°C
• • • •
875 • • •0.1 - 10 250 50 • • • •
876 • • •0.125 - 5 250 35 - 50 • • • • •
877 • • •2 - 6.3 250 35 - 63 • • • • •
4.5x14.5
mm
(2AG)
208 • • •0.125 - 10 350 100
-55°C to +125°C
• • • • • •
209 • • •0.25 - 7 350 100 • • • • • •
220 • • Special Fuse 0.3 - 7 250 / 300 / 350 35 - 100 • • • • • • •
2205 • • •0.25 - 2.5 250 35 • • • • •
224/225 • •• •0.375 - 10 250 / 125 35 - 500 • • • • • • •
229/230 • •• •0.25 - 7 250 / 125 35 - 400 • • • • • • •
5x20
mm
217 • • •0.032 - 15 250 35 - 150
-55°C to +125°C
•• •• ••••• • •
218 • • •0.032 - 16 250 35 - 100 •• •• ••••• • •
213 • • •0.2 - 6.3 250 35 - 63 • • • • • • • • • •
219XA • • •0.04 - 6.3 250 150 • • • • • • • • • •
216 • • •0.05 - 16 250 750 - 1500 •• •• ••••• • •
215 • • •0.125 - 20 250 400 / 1500 •• •• ••••• • •
232 • • •1 - 10 250 / 125 300 / 10,000 • • • • •
235 • • •0.1 - 7 250 / 125 35 - 10,000 • • • • • • •
233 • • •1 - 10 125 10,000 • • • • • • •
234 • • •1 - 10 250 100 - 200 • • • • • • •
239 • • •0.08 - 7 250 / 125 35 - 10,000 • • • • • • •
285 • • •0.125 - 20 250 400 - 1500 • • • •
477 • • •0.5 - 16 400DC / 500AC 100 - 1500 • • • • • • •
977 • • •0.5 - 16 450DC / 500AC 200 / 100 • • • • •
6.3x32 mm
(3AG/3AB)
312/318 • •• •0.062 - 35 250 / 32 35 - 300
-55°C to +125°C
• • • • • • • •
313/315 • •• •0.01 - 30 250 / 125 / 32 35 - 300 • • • • • • • •
314/324 • •• •0.375 - 40 250 35 - 1000 • • • • • • • •
322 • • •12 - 30 65 200 - 1000 • • • •
332 • • •1- 10 250 100 / 200 • • • • • •
325/326 • •• •0.01 - 30 250 100 - 600 • • • • • • • •
505 • • •10 - 30 450 / 500 20,000 - 50,000 • • • • •
506 • • •15 - 20 600DC 10,000 • • • • •
508 • •
1000VAC / DC
High Voltage
Fuse
0.315 - 1 1000 10,000 • • • • •
FusehoLdeR seLeCtioN guide
Circuit Connection Method Wire Wire Connector Terminals TH= Thru-Hole SM= Surface Mount CT= Wire Connector Terminal QC= Quick Connect
Fuseholder Type In- Line
Fuseholders
Panel Mount
Fuse Enclosures
Circuit Board Mount
Fuse Enclosures Fuse Blocks Fuse Clips
Fuse Type
Fuse Series
4.5x14.5
mm
(2AG)
208 / 209
225 / 229
150274
150300
150307
150308
3452 series Int. Shocksafe CT 254 011 - 008 TH 111501
345 series Int. Shocksafe ( old ) TH 254 101, 254 121 SM 111505
245001 Solder QC TH 254 131 TH 111506
245002 Nema QC QC 254 201 - 208 TH 111510
286377 Fip Top TH 111512
5x20
mm
213 / 215
216 /
217
218 / 219XA
232 / 233
234 / 235
239 / 285
377 / 477
617 / 618
150274
150300
150307
150308
150315
150316
150317
150318
150319
PTF0080M
FH503
345 Shocksafe TH 345121 Shocksafe TH 354252 TH 100 / 111 Series
3455 Int. Shocksafe TH 4450718 / 595 / 596 TH 445073 TH 04450001 / 00300210
286677 Flip Top TH 598 / 652 TH 520 002, 520 101 TH 5200001
800 / 801 / 802 / 821 Series TH 810 / 811 / 813 / 814 QC 520 003, 520 005 TH 52000001009
823 Series Snap-in TH 830 / 831 / 834 CT 520 004 TH 52100001009
824 / 824 - 20 / 850 / 851 / 860 series TH 852 / 853 / 862 TH 646 / 649 / 656 TH 51900001009
870 Series Medical Grade TH PTF045 / PTF050 CT 647 TH 51800001009
820/ 820-20 Series Mini Shocksafe SM 658 TH 523 Series
601 CT PTF010 / PTF020 TH 445 Series
445 TH NY61AP
PTF030 / PTF035 / PTF040 TH PTF015 / PTF065 TH OCT136
PTF055 / PTF070 TH PTF075 / PTF077 TH FC51
TH PTF078
FH02A FB55 / FB58
6.3x32
mm (3AB/3AG)
312
313
314
322
326
332
373
505
506
508
605
155 Series
150322
445
PTF080
LH61A800
FH602 / FH604
3453 Series Int. Shocksafe TH 345101 Shocksafe CT 354 Series CT 101001 / 101002
345 Series Int. Shocksafe (old) TH 810 Series QC 35406 CT 101003 / 102064
342 Series Traditionalf TH 811 Series QC 35408 CT 121001 / 121002
342006 Watertight TH 813 Series QC 35409 CT 121003 / 121004
TH 814 Series CT 356 Series TH 102071
344 Series Snap / Panel Mount TH 862 Series CT 359 Series TH 102076 / 102078
348 Series Snap Mount QC OMN002 TH 102079 / 102080
340 Series RF Shielded / Watertight QC OMN004 TH 122083 / 122087
346877 Flip Top QC OMN006 TH 122088 / 122093
342021 (FHN26W) Water Tight QC FB65 / FB66 TH 122090 / 100058
342024 (FHN26G2) Drip Proof TH 51800001009
342025 (FHN20G) Drip Proof CT 101010
800 Series Shocksafe TH 102074
801 / 802 / 803-01 Series TH 10207101009
030201
860 Series 0CT136
TE5 /
TR5® Fuse
303 / 369
370 / 372
373 / 374
382 / 383
385 / 392
395 / 396
397 / 398
400 / 662
663 / 664
665 / 804
807 / 808
570 Series TH 571 0000 000
TH 559 / 560 / 562 Series
SM 564 Series
TH 576 Series
TH 556 / 557
Micro™ Fuse
/ TR3
262 / 268
269 / 272
273 / 274
278 / 279
282001 Front mt. Neoprene TH 281005 Vertical Silver
282007 Front mt. Conductive TH 281007 Horizontal Silver
282002 Rear mt. Neoprene TH 281008 Vertical Tin
282008 Rear mt. Conductive TH 281010 Horizontal Tin
280004 32V indicating
Overcurrent Protection Technologies (continued)
littelfuse.com
PTC PRODUCTS
PTCs (positive temperature coefficient) increase resistance as temperature increases. They are designed to prevent unsafe
levels of current while allowing constant safe current levels, and their resistance will “reset” automatically when the current and
temperature returns to a safe level. PTCs are typically used in applications where automatic reset is desired.
Series Name1
View Datasheet
Order Samples
Size2Hold Current (IHOLD)Max Voltage
(VMAX)
Max Fault
current (IMAX)
Operating
Temperature
Range
Agency Approvals
Halogen Free
RoHS
Lead Free
cUR
UR
TUV
Surface Mount:
LoRho PTC
(Low Resistance)
• •
0402 0.1 - 0.5A
6 / 12 V 50 A • • • • • •
0603 0.5 - 2.0A
0805 0.75 - 3.0A
-40°C to 85°C
1206 0.75 - 4.5A
1812 1.9 - 3.7A
2920 7.0A
0603L • • 0603
(1608) 0.04 - 0.5A 6 - 15 V 40 A • • • • • •
0805L • • 0805
(2012) 0.10 - 1.10 A 6 - 15 V 100 / 40 A • • • • • •
1206L • • 1206
(3216) 0.10 - 2.0A 6 - 30 V 100 A • • • • • •
1210L • • 1210
(3225) 0.05 - 2.0A 6 - 30 V 10 / 100 A • • • • • •
1812L • • 1812
(4532) 0.1 - 3.0A 6 - 60 V 10 / 20 / 100 A • • • • • •
2016L • • 2016
(5041) 0.30 - 2.00 A 6 - 60 V 20 / 40 A • • • • • •
2920L • • 2920
(7351) 0.30 - 3.00 A 6 - 60 V 10 / 40 A • • • • • •
250S • • see data sheet 0.13 A 60 V 3 A • • • •
Radial Leaded:
USBR • •
see data sheet
0.75 - 2.50 A 6 / 16 V 40 A
-40°C to 85°C
• • • • •
16R • • 2.50 - 14.00 A 16 V 100 A • • • • •
30R • • 0.90 - 9.00 A 30 V 40 A • • • • •
60R • • 0.10 - 3.75 A 60 V 40 A • • • • •
72R • • 0.20 - 3.75 A 72 V 40 A • • • • •
250R • • 0.08 - 0.18 A 250 V 3 / 10 A • • • • •
600R • • 0.15 - 0.16 A 600 V 3 A • • • • •
Battery Strap:
SL
(Low Resistance)
• • see data sheet 1.9 - 3.7 A 6 V 50 A -40°C to 85°C • • • • • •
(1) Detailed information about most product series listed here can be found on our web site.
(2) Size for these surface mount items refers to common industry length and width dimensions of the device surface area. Example: 0402 = .04” x .02”
VARISTOR PRODUCTS
Shorthand for “Variable Resistors,” Varistors possess characteristics that divert transient currents away from sensitive components.
Littelfuse offers two types: Miniature surface mount Multi-Layer Varistors (MLVs) for small electronics applications and Metal Oxide
Varistors (MOV) for higher energy applications.
Overvoltage Suppression Protection
Series Name1
View Datasheet
Order Samples
Technology
Type
Operating
AC Voltage
Range
Operating
DC Voltage
Range
Peak Current
Range2 (A)
Peak Energy
Range (J)
Operating
Temperature
Range
Lines
Protected
Mount/
Form Factor Disc Size
Agency Approvals
RoHS
Lead Free
Halogen Free
UR
CSA
VDE
CECC
QPL
Surface Mount MLV / MOV:
MHS • •
Multi-Layer
Zinc Oxide
(MLV)
9 - 42 30 - 135 300
-55 to
+125°C
1
Surface
Mount
Not
Applicable
•
MLE • • 18 18 22 - 28 •
ML • • 2.7 - 107 5.5 - 120 4 - 500 0.02 - 2.5 •
AUML • • 18 •
MLN • • 18 5.5 - 18 30 0.05 - 0.10 4 •
CH • •
Zinc Oxide
(MOV)
14 - 275 18 - 369 100 - 250 1.0 - 8.0
1
• •
SM7 • • 115 - 510 369 - 675 1200 23 - 40 -55 to +85°C
• • • •
SM20 • • 20 - 320 26 6500 165 • • • •
Radial Leaded MOV:
UltraMOV™
Varistor • •
Zinc
Oxide
130 - 625 170 - 825 1750 -10000 12.5 - 720
-55 to +85°C 1 Radial
Leaded
7, 10, 14
20mm •••• •••
UltraMOV™ 25S
Varistor • • 115 - 750 150 - 970 22000 230 - 890 25mm •••• •••
C-III • • 130 - 660 3500 - 9000 40 - 530 10, 14, 20mm ••• •••
LA • • 130 - 1000 175 - 1200 1200 - 6500 11 - 360 7, 10, 14
20mm •••• •••
ZA • • 4 - 460 5.5 - 615 50 - 6500 0.1 - 52 5, 7, 10, 14,
20mm • • • • • •
Industrial High Energy Terminal MOV:
BA/BB ••
•
Zinc
Oxide
130 - 2800 175 - 3500 50000
70000 450 - 10000
-55 to +85°C 1
Screw /
Clip
Terminals
60mm • •
DA/DB ••
•130 - 750 175 - 970 40000 270 - 1050 40mm • • •
HA • • 130 - 750 175 - 970 25000
40000 200 - 1050
Industrial
Packaged
Radial Leads
32, 40mm •• •••
HB34,
HG34, HF34 •130 - 750 175 - 970 40000 270 - 1050 34mm •• •••
DHB34 • • 250 - 2800 330 - 3500 20000
70000 330 - 10000 34mm •• •••
CA • • 250 - 2800 330 - 3500 20000
70000 330 - 10000 Bare Disc 60mm •
Specialty Application MOV:
MA • •
Zinc Oxide
9 - 264 13 - 365 40 - 100 0.06 - 1.7 -55 to +85°C
1
Axial Leaded Not
Applicable •••
RA • • 4 - 275 5.5 - 369 100 - 6500 0.4 - 160 -55 to
+125°C
Inline Radial
Leads
Not
Applicable • • • •
High Reliability •130 - 510 4 - 675 100 - 6500 0.4 - 190 -55 to +85°C (Varies) (Varies) •
Thermally Protected MOV:
SMOV™ 25S
Varistor • •
Zinc Oxide
115 - 750 150 - 970 20000 170 - 670 -45 to +75°C
1
Industrial
Packaged
Radial Leads
25mm • • •
SMOV™ 34S
Varistor • • 115 - 750 150 - 970 40000 280 - 1200 -45 to +75°C
Industrial
Packaged
Radial Leads
34mm • • •
TMOV® 25S
Varistor • • 115 - 750 150 - 970 20000 170 - 670 -55 to +85°C Radial
Leaded 25mm • • • • •
TMOV® 34S
Varistor • • 115 - 750 150 - 970 40000 235 - 1050 -55 to +85°C
Industrial
Packaged
Radial Leads
34mm • • • • •
TMOV® Varistor /
iTMOV® Varistor ••
•115 - 750 150 - 970 6000 - 10000 35 - 480 -55 to +85°C Radial
Leaded 14, 20mm •••• ••
(1) Detailed information about most product series listed here can be found on our web.
(2) Not an applicable parameter for Crowbar devices
littelfuse.com
GDT PRODUCTS
GDTs (gas discharge tube) dissipate voltage transients through a contained plasma gas. They have high insulation resistance plus low
capacitance and leakage to ensure minimal effect on normal operation of equipment. Littelfuse devices offer a small footprint and are available
in leaded and surface mount configurations, with high surge handling capability. Their fast response to transient over-voltage events, and ability
to dissipate large amounts of energy, translates into reduced risk of equipment damage. The amount of energy they can dissipate makes them a
good choice for lightning surge protection, particularly for telecom equipment located in outdoor structures.
Series
Name1
View Datasheet
Order Samples
DC Breakover
Voltage Range
(Nom VBO)
Max AC
Surge Rating
Peak Pulse
Current
(8/20µs)
Max
Capacitance
Operating
Temperature Range
# Terminals
Mounting Options
RoHS Compliant
Lead Free
Mini Tube
Surface
Axial Lead
Radial Lead
Cartridge Clip
High Voltage GDTs:
AC • • 285 - 600
NA
5000A 1.5pF
-40°C to +90°C
2• •
CG3 • • 1000 - 7500 5000A 1.5pF 2 • •
Low to Medium Surge GDTs:
CG5 • • 90 - 600 5A 5000A 1.5pF
-40°C to +90°C
2• • • •
SL0902A • • 90 - 600 5A 5000A 1.5pF 2 • • • •
SL1002A • • 75 - 600 5A 5000A 1.2pF 2 • • • •
SL1003A • • 90 - 500 10A* 10,000A 1.2pF 3 • • • • •
SL1011A • • 75 - 600 5A 5000A 1.5pF 2 • • • •
Medium to High Surge GDTs:
SG
(1812 Size) • • 75 - 420 500 - 750 1.0pF
-40°C to +90°C
• • •
SL1122A • • 90 - 260 10A* 10000A* 100-270pF 3 • •
SL1021A • • 90 - 600 10A* 10000A* 1.5pF 3 • • • •
SL1024A • • 90 - 600 10A* 10000A* 1.5pF 3 • • • •
PMT8 • • 90 - 400 10A* 20000A* 1.5pF 3 • • • •
SL1011B • • 75 - 350 10A 10000A 1.5pF 2 • • • •
SL1411A • • 75 - 600 10A 10000A 1.5pF 2 • • • •
PMT3 • • 90 - 500 20A* 20000A* 1.5pF 3 •••
CG/CG2 • • 75 - 1000 20A 20000A 1.5pF 2 • • • •
Very High Surge GDTs:
SL1021B • • 90 - 600 10A* 20000A* 1.5pF
-40°C to +90°C
3• • • •
SL1024B • • 90 - 600 10A* 20000A* 1.5pF 3 • • • •
SL1026 • • 275 - 700 10A* 20000A* 2 •••
(1) Detailed information about most product series listed here can be found on our web site.
* Total current through center (ground) terminal
PULSEGUARD® ESD SUPPRESSORS
Series
Name
View Datasheet
Order Samples
Surface Mount
Through-Hole
Technology Type Working Voltage Array Package
(No. of Lines)
Single Line
Package
Typical Device
Capacitance
Leakage
Current
Rated
Immunity to
IEC 61000-4-
2 level 4
Also Rated
for EFT or
Lightning
Bidirectional
(transients
of either
polarity)
Performs Low
Pass Filtering
PulseGuard® ESD Suppressors:
PGB1 • • •Voltage Variable
Material 0–24VDC SOT23 (2) 0402,
0603 0.04–0.12pF <1nA • •
PGB2 • • •Voltage Variable
Material 0–12VDC NA 0402,
0201 0.07pF <1nA • •
Overvoltage Suppression Protection (continued)
TVS DIODES
TVS Diodes are used to protect semiconductor components from high-voltage transients. Their p-n junctions have a larger cross-sectional
area than those of a normal diode, allowing them to conduct large currents to ground without sustaining damage. Littelfuse supplies TVS
Diodes with peak power ratings from 200W to 30kW, and reverse standoff voltages from 5V to 512V.
Series Name Photo
View Datasheet
Order Samples
Package Type Reverse Standoff Voltage
(VR)
Peak Pulse Power
Range†
(PPP)
Peak Pulse
Current
(IPP 8/20μs)
Operating
Temperature
Halogen-Free
RoHS Compliant
UR Recognized
Surface Mount-Standard Application (200–5000W):
SMF • • SOD-123 5.0 - 54 200W
-85° to +302° F
(-65° to +150° C)
• • *
SMAJ
• • DO-214AC 5.0 - 440 400W • • •
P4SMA
• • DO-214AC 5.8 - 495 400W • • •
SMA6J • • DO-214AC 5.0 - 12 600W • • •
SMA6L • • DO-221AC 5.0 - 85 600W • • *
SACB • • DO-214AA 5.0 - 50 500W • • •
SMBJ •DO-214AA 5.0 - 440 600W • • •
P6SMB
• • DO-214AA 5.8 - 495 600W • • •
1KSMB
• • DO-214AA 5.8 - 136 1000W • • •
SMCJ • • DO-214AB 5.0 - 440 1500W • • •
1.5SMC •DO-214AB 5.8 - 495 1500W • • •
SMDJ •DO-214AB 5.0 - 170 3000W • • •
5.0SMDJ • • DO-214AB 12 - 170 5000W • • •
Axial Leaded-Standard Application (400–5000W):
P4KE
• • DO-41 5.8 - 495 400W
-85° to +302° F
(-65° to +150° C)
• • •
SA
• • DO-15 5.0 - 180 500W • • •
SAC
• • DO-15 5.0 - 50 500W • • •
P6KE
• • DO-15 5.8 - 512 600W • • •
1.5KE • • DO-201 5.8 - 512 1500W • • •
LCE • • DO-201 6.5 - 90 1500W • • •
3KP • • P600 5.0 - 220 3000W • • •
5KP • • P600 5.0 - 250 5000W • • •
Axial Leaded-High Power:
15KPA • • P600 17 - 280 15000W
-85° to +302° F
(-65° to +150° C)
• • •
20KPA • • P600 20 - 300 20000W • • •
30KPA • • P600 28 - 288 30000W • • •
AK1 • • Radial Lead 76 1000A
-67° to +347° F
(-55° to +150° C)
• • •
AK3 • • Radial Lead 15 - 430 3000A• • •
AK6 • • Radial Lead 30 - 430 6000A• • •
AK10 • • Radial Lead 30 - 430 10000A • • •
AK15 • • Radial Lead 58 - 76 15000A-67° to +257° F
(-55° to +125° C) • • •
Remark: "*" UR approval is pending.
littelfuse.com
Explore the latest LED lighting industry
standards, product information, circuit
diagrams and links to application notes
and videos using this NEW e-book.
Scan this code
to view our
LED Lighting
Design Guide.
LED LIGHTING DESIGN
A guide for protecting Ethernet circuits
and equipment from electrostatic
discharge (ESD), lightning, power faults
and other electrical transient threats.
Scan this code
to view our
Ethernet
Design Guide.
ETHERNET PROTECTION
A guide for protecting electronic circuits
and interfaces from electrostatic
discharge (ESD) using TVS Diode Arrays.
Scan this code
to view our ESD
Protection
Design Guide.
ESD PROTECTION
Learn about the key selection
criteria and tradeoffs among protection
technologies for USB 3.0 devices.
Recently updated!
Scan this code to
view our USB 3.0
Circuit Protection
Application Note.
USB 3.0 CIRCUIT PROTECTION
TVS DIODES (continued)
Series Name Photo
View Datasheet
Order Samples
Package Type Reverse Standoff Voltage
(VR)
Peak Pulse Power
Range†
(PPP)
Peak Pulse
Current
(IPP 8/20μs)
Operating
Temperature
Halogen-Free
RoHS Compliant
UR Recognized
AEC-Q101
Compliant
Automotive Application:
TPSMA6L • • DO-221AC 10 - 60 600W -85° to +302° F
(-65° to +150° C) • • *•
Remark: "*" UR approval is pending.
Overvoltage Suppression Protection (continued)
TVS DIODE ARRAY – SPA® DIODES
TVS Diode Arrays are designed to protect analog and digital signal lines from electrostatic discharge (ESD), Electrical Fast Transients
(EFT), and lightning-induced surge currents. Offering low dynamic resistance for improved clamping performance, TVS Diode
Arrays are offered in a wide range of industry standard discrete and multi-channel SMD packages. Features of this portfolio include
capacitance as low as 0.4 pF and enhanced ESD capability up to ±30kV (contact discharge).
Series Name Photo
View
Datasheet
Order
Samples
Package Type Working
Voltage Capacitance Number of
Channels
ESD Rating
(Contact
Discharge,
IEC61000-4-2)
Clamping Voltage
(tP=8/20µs)
Maximum
Surge
Rating
(tP=8/20µs)
Lead Free/
Green
RoHS
Compliant
General Purpose ESD Protection (SCR Diode Array):
SP720 • •
PDIP
SOIC
2-30V 3pF 14 4kV 2V @ 1A 3A • •
SP721 • • 2-30V 3pF 6 4kV 2V @ 1A 3A • •
SP723 • • 2-30V 5pF 6 8kV 2V @ 2A 7A • •
SP724 • • SOT23 2-20V 3pF 4 8kV 2V @ 1A 3A • •
SP725 • • SOIC 2-30V 5pF 4 8kV 2V @ 2A 14A • •
General Purpose ESD Protection (TVS Discretes and Arrays):
SP05 • •
SC70
SOT23
SOT143
MSOP
5.5V 30pF 2 / 3 / 4 / 5 /
6 30kV N/A N/A • •
SP1001 • •
SC70
SOT553
SOT563
SOT963
5.5V 8pF 2 / 4 / 5 15kV 8.0V @ 1A 2A • •
SP1002 • • SC70 6.0V 5pF 1 / 2 8kV 9.2V @ 1A 2A • •
SP1003 • • 0402 (SOD723)
0402 (SOD882) 5.0V 30pF 1 30kV 12.0V @ 7A 7A • •
SP1004 • • SOT953 6.0V 5pF 4 8kV 10V @ 1A 1A • •
SP1005 • • 0201 (Flipchip)
0402 (SOD882) 6.0V 30pF 1 30kV 9.3V @ 1A 10A • •
SP1006 • • 0201 (µDFN-2) 6.0V 25pF 1 30kV 8.3V @ 1A 5A • •
SP1007 • • 0201 (Flipchip)
0402 (SOD882) 6.0V 3.5pF 1 8kV 11.2V @ 1A 2A • •
SP1008 0201 (Flipchip) 6.0V 6pF 1 15kV 10.7V @ 1A 2.5A • •
SP1011 • • µDFN-6 6.0V 7pF 4 15kV 8.7V @ 1A 2A • •
Low Capacitance ESD Protection:
SP3001 • • SC70 6.0V 0.65pF 4 8kV 9.5V @ 1A 2.5A • •
SP3002 • •
SC70
SOT23
µDFN-6 6.0V 0.85pF 4 12kV 9.5V @ 1A 4.5A • •
SP0504S SOT23
SP3003 • •
µDFN-6
SC70
SOT5x3
MSOP10
6.0V 0.65pF 2 / 4 / 8 8kV 10.0V @ 1A 2.5A • •
SP3004 • • SOT563 6.0V 0.85pF 4 12kV 10.0V @ 1A 4A • •
SP3010 • • µDFN-10 6.0V 0.45pF 4 8kV 10.8V @ 1A 3A • •
SP3011 • • µDFN-14 6.0V 0.40pF 6 8kV 11.0V @ 1A 3A • •
SP3012 • • µDFN-10
µDFN-14 5.0V 0.50pF 4 / 6 12kV 6.6V @ 1A 4A • •
SP3021 0402 (SOD882) 5.0V 0.50pF 1 8kV 13.1V @ 1A 2A • •
SP3030 0402 (SOD882) 5.0V 0.50pF 1 20kV 9.2V @ 1A 3A • •
SP3031 0402 (SOD882) 5.0V 0.80pF 1 10kV 6.9V @ 1A 5A • •
SP0524P µDFN-10 5.0V 0.50pF 4 12kV 6.6V @ 1A 4A • •
Lightning Surge Protection:
SRV05-4 SOT23 6.0V 2.4pF 4 20kV 11.5V @ 5A 10A • •
SP03-3.3 • • SOIC 3.3V 16pF 2 30kV 15V @ 100A 150A • •
SP03-6 • • SOIC 6.0V 16pF 2 30kV 20V @ 100A 150A • •
LC03-3.3 SOIC 3.3V 9.0pF 2 30kV 17V @ 100A 150A • •
SP2502L SOIC 3.3V 5.0pF 2 30kV 20V @ 75A 75A • •
SLVU2.8 SOT23 2.8V 2.0pF 1 30kV 13.9V @ 24A 40A • •
SLVU2.8-4 • • SOIC 2.8V 2.0pF 4 30kV 13.9V @ 24A 40A • •
SR70 • • SOT143 70V 2.0pF 2 30kV 12V @ 30A 40A • •
SP4060 • • MSOP 2.5V 4.4pF 8 30kV 8.0V @ 10A 20A • •
SP2504N µDFN-10 2.5V 3.5pF 4 30kV 6.3V @ 5A 20A • •
SP3304N µDFN-10 3.3V 3.5pF 4 30kV 7V @ 5A 20A • •
littelfuse.com
PLED LIGHT-EMITTING DIODE (LED) PROTECTORS
Littelfuse PLED devices provide added reliability to LED lighting strings. Designed to minimize the impact of losing an entire
LED string due to a single LED failure, PLED devices provide a switching function that will bypass LEDs that go open circuit,
and allow current to flow to the remaining LEDs in the string. PLED devices also offer LED protection against electrostatic
discharge (ESD) and accidental reverse power connection (PLED5 devices only). Designed to serve the needs of high brightness
outdoor LED lighting applications (advertising and traffic signs, roadway/pathway/runway lighting, aircraft and emergency
lighting, etc), PLED devices help assure reliability and lower maintenance costs.
Part Number Photo
View Datasheet
Order Samples
Powermite
QFN 3x3
DO-214
VBR
breakdown IHISIT@VTVT and IT Critical rate of
rise dV/dt
Volts mAmps mAmps Amps Volts Volts
Min Max Max Max Max Max
PLED6M • • •5.5 7.5 12 70 0.35 1.2 N/A
PLED6Q12 • • •
6 16
5 100 1.0 1.2 250V/µs
PLED6S • • •
PLED9Q12 • • •
9 18
PLED9S • • •
PLED13Q12 • • •
13 26
PLED13S • • •
PLED18Q12 • • •
18 33
PLED18S • • •
Part Number Photo
View Datasheet
Order Samples
QFN 2x2
SOT 89
VAK
Input
Voltage
VTO
Turn-On
Voltage
IS
Switching
Current
VOS