1Publication Order Number:
P6SMB11CAT3/D
P6SMB11CAT3G Series,
SZP6SMB11CAT3G Series
600 Watt Peak Power Zener
Transient Voltage
Suppressors
Bidirectional*
The SMB series is designed to protect voltage sensitive
components from high voltage, high energy transients. They have
excellent clamping capability, high surge capability, low zener
impedance and fast response time. The SMB series is supplied in
the Littelfuse exclusive, cost-effective, highly reliable
package and is ideally suited for use in communication
systems, automotive, numerical controls, process controls,
medical equipment, business machines, power supplies and many
other industrial/consumer applications.
Features
•Working Peak Reverse Voltage Range − 9.4 to 77.8 V
•Standard Zener Breakdown Voltage Range − 11 to 91 V
•Peak Power − 600 W @ 1 ms
•ESD Rating of Class 3 (> 16 kV) per Human Body Model
•Maximum Clamp Voltage @ Peak Pulse Current
•Low Leakage < 5 mA Above 10 V
•UL 497B for Isolated Loop Circuit Protection
•Response Time is Typically < 1 ns
•SZ Prefix for Automotive and Other Applications Requiring Unique
Site and Control Change Requirements; AEC−Q101 Qualified and
PPAP Capable
•These are Pb−Free Devices
Mechanical Characteristics:
CASE: Void-Free, Transfer-Molded, Thermosetting Plastic
FINISH: All External Surfaces are Corrosion Resistant and Leads are
Readily Solderable
MAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES:
260°C for 10 Seconds
LEADS: Modified L−Bend Providing More Contact Area to Bond Pads
POLARITY: Polarity Band Will Not be Indicated
MOUNTING POSITION: Any
*Please see P6SMB6.8AT3 to P6SMB200AT3 for Unidirectional devices.
PLASTIC SURFACE MOUNT
ZENER OVERVOLTAGE
TRANSIENT SUPPRESSORS
9.4−78 VOLTS
600 WATT PEAK POWER
Device Package Shipping
ORDERING INFORMATION
SMB
CASE 403A
PLASTIC
MARKING DIAGRAM
AYWW
xxC G
G
xxC = Device Code
A = Assembly Location
Y = Year
WW = Work Week
G= Pb−Free Package
(Note: Microdot may be in either location)
P6SMBxxCAT3G SMB
(Pb−Free)
2,500 /
Tape & Reel
The “T3” suffix refers to a 13 inch reel.
SZP6SMBxxCAT3G SMB
(Pb−Free)
2,500 /
Tape & Reel
Littelfuse.com
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 13
P6SMB11CAT3G Series, SZP6SMB11CAT3G Series
MAXIMUM RATINGS
Rating Symbol Value Unit
Peak Power Dissipation (Note 1) @ TL = 25°C, Pulse Width = 1 ms PPK 600 W
DC Power Dissipation @ TL = 75°C Measured Zero Lead Length (Note 2)
Derate Above 75°C
Thermal Resistance, Junction−to−Lead
PD
RqJL
3.0
40
25
W
mW/°C
°C/W
DC Power Dissipation (Note 3) @ TA = 25°C
Derate Above 25°C
Thermal Resistance, Junction−to−Ambient
PD
RqJA
0.55
4.4
226
W
mW/°C
°C/W
Operating and Storage Temperature Range TJ, Tstg −65 to +150 °C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. 10 X 1000 ms, non−repetitive
2. 1″ square copper pad, FR−4 board
3. FR−4 board, using Littelfuse minimum recommended footprint, as shown in 403A case outline dimensions spec.
ELECTRICAL CHARACTERISTICS
(TA = 25°C unless otherwise noted)
Symbol Parameter
IPP Maximum Reverse Peak Pulse Current
VCClamping Voltage @ IPP
VRWM Working Peak Reverse Voltage
IRMaximum Reverse Leakage Current @ VRWM
VBR Breakdown Voltage @ IT
ITTest Current
QVBR Maximum Temperature Coefficient of VBR Bi−Directional TVS
IPP
IPP
V
I
IR
IT
IT
IR
VRWM
VCVBR
VRWM VC
VBR
ELECTRICAL CHARACTERISTICS (Devices listed in bold, italic are Littelfuse Preferred devices.)
Device* Device
Marking
VRWM
(Note 4
)
IR @
VRWM
Breakdown Voltage VC @ IPP (Note 6)
QVBR
Ctyp
(Note 7)
VBR Volts (Note 5) @ ITVCIPP
Volts mAMin Nom Max mA Volts Amps %/°C pF
P6SMB11CAT3G
P6SMB12CAT3G
11C
12C
9.4
10.2
5
5
10.5
11.4
11.05
12
11.6
12.6
1
1
15.6
16.7
38
36
0.075
0.078
865
800
P6SMB15CAT3G
P6SMB16CAT3G
P6SMB18CAT3G
P6SMB20CAT3G
15C
16C
18C
20C
12.8
13.6
15.3
17.1
5
5
5
5
14.3
15.2
17.1
19
15.05
16
18
20
15.8
16.8
18.9
21
1
1
1
1
21.2
22.5
25.2
27.7
28
27
24
22
0.084
0.086
0.088
0.09
645
610
545
490
P6SMB22CAT3G
P6SMB24CAT3G
P6SMB27CAT3G
P6SMB30CAT3G
22C
24C
27C
30C
18.8
20.5
23.1
25.6
5
5
5
5
20.9
22.8
25.7
28.5
22
24
27.05
30
23.1
25.2
28.4
31.5
1
1
1
1
30.6
33.2
37.5
41.4
20
18
16
14.4
0.09
0.094
0.096
0.097
450
415
370
335
P6SMB33CAT3G
P6SMB36CAT3G
P6SMB39CAT3G
P6SMB43CAT3G
33C
36C
39C
43C
28.2
30.8
33.3
36.8
5
5
5
5
31.4
34.2
37.1
40.9
33.05
36
39.05
43.05
34.7
37.8
41
45.2
1
1
1
1
45.7
49.9
53.9
59.3
13.2
12
11.2
10.1
0.098
0.099
0.1
0.101
305
280
260
240
P6SMB47CAT3G
P6SMB51CAT3G
P6SMB56CAT3G
P6SMB62CAT3G
47C
51C
56C
62C
40.2
43.6
47.8
53
5
5
5
5
44.7
48.5
53.2
58.9
47.05
51.05
56
62
49.4
53.6
58.8
65.1
1
1
1
1
64.8
70.1
77
85
9.3
8.6
7.8
7.1
0.101
0.102
0.103
0.104
220
205
185
170
P6SMB68CAT3G
P6SMB82CAT3G
68C
82C
58.1
70.1
5
5
64.6
77.9
68
82
71.4
86.1
1
1
92
113
6.5
5.3
0.104
0.105
155
130
4. A transient suppressor is normally selected according to the working peak reverse voltage (VRWM), which should be equal to or greater than
the DC or continuous peak operating voltage level.
5. VBR measured at pulse test current IT at an ambient temperature of 25°C.
6. Surge current waveform per Figure 2 and derate per Figure 3 of the General Data − 600 Watt at the beginning of this group.
7. Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C
*Include SZ-prefix devices where applicable.
2Publication Order Number:
P6SMB11CAT3/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 13
P6SMB11CAT3G Series, SZP6SMB11CAT3G Series
P , PEAK POWER (kW)
P
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2
tP
, PULSE WIDTH
1
10
100
0.1 ms1 ms10 ms 100 ms1 ms 10 ms
0.1
Figure 1. Pulse Rating Curve
01234
0
50
100
t, TIME (ms)
VALUE (%)
HALF VALUE - IPP
2
PEAK VALUE - IPP
tr≤ 10 ms
Figure 2. Pulse Waveform
TYPICAL PROTECTION CIRCUIT
Vin VL
Zin
LOAD
Figure 3. Pulse Derating Curve
PEAK PULSE DERATING IN % OF
PEAK POWER OR CURRENT @ T
A= 25 C°
100
80
60
40
20
00 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
120
140
160
tP
PULSE WIDTH (tP) IS DEFINED AS
THAT POINT WHERE THE PEAK
CURRENT DECAYS TO 50% OF
IPP
.
Figure 4. Typical Junction Capacitance vs. Bias
Voltage
P6SMB11CAT3G
P6SMB18CAT3G
P6SMB47CAT3G
P6SMB91CAT3G
BIAS VOLTAGE (VOLTS)
11010
0
10
100
1000
C, CAPACITANCE (pF)
1
5
TJ = 25°C
f = 1 MHz
3Publication Order Number:
P6SMB11CAT3/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 13
P6SMB11CAT3G Series, SZP6SMB11CAT3G Series
APPLICATION NOTES
Response Time
In most applications, the transient suppressor device is
placed in parallel with the equipment or component to be
protected. In t his situation, t here i s a time d elay a ssociated with
the capacitance of the device and an overshoot condition
associated w ith t he inductance o f t he d evice and t he i nductance
of the connection method. The capacitive effect is of minor
importance in the parallel protection scheme because it only
produces a time delay in the transition from the operating
voltage to the clamp voltage as shown in Figure 4.
The inductive effects in the device are due to actual turn-on
time ( time r equired f or t he d evice t o g o f rom z ero c urrent t o f ull
current) a nd l ead i nductance. T his i nductive e ffect p roduces a n
overshoot in the voltage across the equipment or component
being protected as shown in Figure 5. Minimizing this
overshoot is very important in the application, since the main
purpose for adding a transient suppressor is to clamp voltage
spikes. The SMB series have a very good response time,
typically < 1 ns and negligible inductance. However, external
inductive effects could produce unacceptable overshoot.
Proper circuit layout, minimum lead lengths and placing the
suppressor device as close as possible to the equipment or
components to be protected will minimize this overshoot.
Some input impedance represented by Zin is essential to
prevent overstress of the protection device. This impedance
should be as high as possible, without restricting the circuit
operation.
Duty Cycle Derating
The data of Figure 1 applies for non-repetitive conditions
and at a lead temperature of 25°C. If the duty cycle increases,
the peak power must be reduced as indicated by the curves of
Figure 6 . Average p ower m ust b e d erated a s t he l ead o r a mbient
temperature rises above 25°C. The average power derating
curve normally given on data sheets may be normalized and
used for this purpose.
At first glance the derating curves of Figure 6 appear to be
in error as the 10 ms pulse has a higher derating factor than
the 10 ms pulse. However, when the derating factor for a
given pulse of Figure 6 is multiplied by the peak power value
of Figure 1 for the same pulse, the results follow the
expected trend.
VL
V
Vin
Vin (TRANSIENT)
VL
td
V
Vin (TRANSIENT)
OVERSHOOT DUE TO
INDUCTIVE EFFECTS
tD = TIME DELAY DUE TO CAPACITIVE EFFECT
t t
Figure 5. Figure 6.
Figure 7. Typical Derating Factor for Duty Cycle
DERATING FACTOR
1 ms
10 ms
1
0.7
0.5
0.3
0.05
0.1
0.2
0.01
0.02
0.03
0.07
100 ms
0.1 0.2 0.5 2 5 10 501 20 100
D, DUTY CYCLE (%)
PULSE WIDTH
10 ms
4Publication Order Number:
P6SMB11CAT3/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 13
P6SMB11CAT3G Series, SZP6SMB11CAT3G Series
UL RECOGNITION
The entire series has Underwriters Laboratory
Recognition for the classification of protectors (QVGQ2)
under the UL standard for safety 497B and File .
Many competitors only have one or two devices recognized
or have recognition in a non-protective category. Some
competitors have no recognition at all. With the UL497B
recognition, our parts successfully passed several tests
including Strike Voltage Breakdown test, Endurance
Conditioning, Temperature test, Dielectric
Voltage-Withstand test, Discharge test and several more.
Whereas, some competitors have only passed a
flammability test for the package material, we have been
recognized for much more to be included in their Protector
category.
5Publication Order Number:
P6SMB11CAT3/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 13
#E128662
P6SMB11CAT3G Series, SZP6SMB11CAT3G Series
PACKAGE DIMENSIONS
SMB
CASE 403A−03
ISSUE J
2.261
0.089
2.743
0.108
2.159
0.085 ǒmm
inchesǓ
SCALE 8:1
SOLDERING FOOTPRINT
E
bD
c
L1
L
A
A1
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION b SHALL BE MEASURED WITHIN DIMENSION L1.
DIM
AMIN NOM MAX MIN
MILLIMETERS
1.95 2.30 2.47 0.077
INCHES
A1 0.05 0.10 0.20 0.002
b1.96 2.03 2.20 0.077
c0.15 0.23 0.31 0.006
D3.30 3.56 3.95 0.130
E4.06 4.32 4.60 0.160
L0.76 1.02 1.60 0.030
0.091 0.097
0.004 0.008
0.080 0.087
0.009 0.012
0.140 0.156
0.170 0.181
0.040 0.063
NOM MAX
5.21 5.44 5.60 0.205 0.214 0.220
HE
0.51 REF 0.020 REF
D
L1
HE
POLARITY INDICATOR
OPTIONAL AS NEEDED
6Publication Order Number:
P6SMB11CAT3/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 13
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military,
aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or
any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property
damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be
deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be
liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in
applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale,
unless otherwise agreed by Littelfuse.
