SLVU2.8K-4U - Microsemi Corporation

LOW VOLTAGE UNIDIRECTIONAL

TVSarray ™

SCOTTSDALE DIVISION

SLVU2.8K – 4U

WWW.Microsemi .COM SLVU2.8K – 4U

DESCRIPTION APPEARANCE

The SLVU2.8K-4U provides 500 Watt protection with LOW CAPACITANCE, LOW

CLAMPING VOLTAGE and the LOWEST LEAKAGE in the industry for two lines to

ground (common mode). Low unidirectional capacitance of 10 pF for each line and low

standby current provides a more stable signal in higher frequency applications and at

lower operating voltages of 2.8 volts. Negative transients on each line are also clamped

to very low voltages with an anti-parallel forward diode in each leg (line to ground). The

SLVU2.8K-4U is designed for use in applications where protection is required at the

board level from voltage transients caused by electrostatic discharge (ESD) as defined in

IEC 61000-4-2, electrical fast transients (EFT) per IEC 61000-4-4 and effects of

secondary lightning. These arrays are used to protect two lines by connecting both pins 1

and 8 to line 1 and pins 4 and 5 to line 2. Pins 2 and 7 as well as pins 3 and 6 are all

connected to ground as shown in Figures 3, 4 and 5.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

FEATURES APPLICATIONS / BENEFITS

• Protects 2 unidirectional lines to ground with very low

clamping voltage including opposite (negative)

transients on each line with a forward biased diode

• Provides electrically-isolated protection

• Low operating voltage: 2.8 volts

• Low capacitance of 10 pF

• Low standby current

• Low clamping voltage with minimal voltage overshoot

• EIA-RS232 data rate: 19.6 kbs

• EIA-RS422 data rate: 10 Mbs

• EIA-RS423 data rate: 100 kbs

• 10 / 100 Ethernet

• WAN / LAN Equipment

• Lowest standby (leakage) current in the industry

• Very low parasitic inductance resulting in minimal

voltage overshoot (Ldi/dt) effects

• Negative transients minimized that could damage

CMOS transceivers

MAXIMUM RATINGS MECHANICAL AND PACKAGING

• Operating Temperature: -55°C to +150°C

• Storage Temperature: -55°C to +150°C

• Peak Pulse Power: 500 watts

(8/20 µs, Figure 1 and Figure 2)

• Molded SO-8 Surface Mount

• UL 94V-0 Flammability Classification

• Weight 0.066 grams (approximate)

• Marking: Logo, device marking code, date code

• Pin #1 defined by dot on top of package

• Tape & Reel per EIA Standard 481-1-A

• 13 inch reel; 2,500 pieces (STANDARD)

• Carrier tubes; 95 pcs (OPTIONAL)

ELECTRICAL CHARACTERISTICS PER LINE @ 25°C Unless otherwise specified

STANDOFF

VOLTAGE

VWM

VOLTS

PUNCH-THRU

VOLTAGE

VPT

IPT = 2 µA

VOLTS

SNAP-BACK

VOLTAGE

VSB

ISB = 50 mA

VOLTS

STANDBY

CURRENT

VWM = 2.8V

µA

CLAMPING

VOLTAGE

IPP = 2 A

(Figure 2)

VOLTS

CLAMPING

VOLTAGE

IPP = 5 A

(Figure 2)

VOLTS

CLAMPING

VOLTAGE

IPP = 24 A

(Figure 2)

VOLTS

CAPACITANCE

(f=1 MHz) *

@ 0V

PART

NUMBER

DEVICE

MARKING

CODE

MAX MIN MIN MAX MAX MAX MAX TYP

SLVU2.8K-4U 2.8K4U 2.8 3.0 2.8 0.1 5.5 8.5 15 10

* Capacitance line-to-ground is 10 pF typical (including anti-parallel diode for negative transients and low clamping voltage).

Note: Transient Voltage Suppressor (TVS) product is normally selected based on its stand off voltage VWM. Product selected

voltage should be equal to or greater than the continuous peak operating voltage of the circuit to be protected.

Microsemi

Scottsdale Division

8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

Page 1

MSCXXXX.PDF 10-6-2003 REV 0

LOW VOLTAGE UNIDIRECTIONAL

TVSarray ™

SCOTTSDALE DIVISION

SLVU2.8K – 4U

WWW.Microsemi .COM SLVU2.8K – 4U

SYMBOLS & DEFINITIONS

Symbol DEFINITION

VWM Standoff Voltage: Maximum dc voltage that can be applied over the operating temperature range.

VWM must be selected to be equal or be greater than the operating voltage of the line to be protected.

VPT Punch-Thru Voltage: The minimum voltage the device will exhibit at a specified current

VSB Snap-Back Voltage: The minimum snap-back voltage the device will exhibit at a specified current

VC Clamping Voltage: Maximum clamping voltage across the TVS device when subjected to a given current at a

pulse time of 20 µs.

ID Standby Current: Current at VWM.

C Capacitance: Capacitance of the TVS as defined @ 0 volts at a frequency of 1 MHz and stated in picofarads.

GRAPHS

8/20

s 500W Pulse

PPP – Peak Pulse Power (W)

Pulse Time t=µsec FIGURE 2

FIGURE 1 Pulse Wave Form

Peak Pulse Power vs. Pulse Time

Microsemi

Scottsdale Division

8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

Page 2

MSCXXXX.PDF 10-6-2003 REV 0

LOW VOLTAGE UNIDIRECTIONAL

TVSarray ™

Microsemi

Scottsdale Division

8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

Page 3

MSCXXXX.PDF 10-6-2003 REV 0

WWW.Microsemi .COM

SCOTTSDALE DIVISION

SLVU2.8K – 4U

SCHEMATIC

FIGURE 4

FIGURE 3 Circuit Board Layout

Common Mode Configuration

FIGURE 5

Schematic

PACKAGE DIMENSIONS and PAD LAYOUT

PAD LAYOUT

INCHES MILLIMETERS

DIM MIN MAX MIN MAX

A 0.188 0.197 4.77 5.00

B 0.150 0.158 3.81 4.01

C .053 .069 1.35 1.75

D .011 .021 0.28 0.53

F .016 .050 0.41 1.27

G .050 BSC 1.27 BSC

J .006 .010 0.15 0.25

K .004 .008 0.10 0.20

L .189 .206 4.80 5.23

P .228 .244 5.79 6.19

OUTLINE