P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series 600 Watt Peak .../media/electronics/datasheets/tvs... · P6SMB6.8AT3/D P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series 600 Watt Peak Power Zener

1 Publication Order Number:P6SMB6.8AT3/D

P6SMB6.8AT3G Series,SZP6SMB6.8AT3G Series

600 Watt Peak Power ZenerTransient VoltageSuppressors

Unidirectional*

The SMB series is designed to protect voltage sensitivecomponents from high voltage, high energy transients. They haveexcellent clamping capability, high surge capability, low zenerimpedance and fast response time. The SMB series is supplied inthe Littelfuse exclusive, cost-effective, highly reliable package and is ideal ly sui ted for use in communication systems, automotive, numerical controls, process controls, medical equipment, business machines, power supplies and many other industrial/consumer applications.

Specification Features:• Working Peak Reverse Voltage Range − 5.8 to 171 V

• Standard Zener Breakdown Voltage Range − 6.8 to 200 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 �A Above 10 V

• UL 497B for Isolated Loop Circuit Protection

• Response Time is Typically < 1 ns

• SZ Prefix for Automotive and Other Applications Requiring UniqueSite and Control Change Requirements; AEC−Q101 Qualified andPPAP Capable

• These Devices are Pb−Free and are RoHS Compliant

Mechanical Characteristics:CASE: Void-free, transfer-molded, thermosetting plasticFINISH: All external surfaces are corrosion resistant and leads are

readily solderableMAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES:

260°C for 10 SecondsLEADS: Modified L−Bend providing more contact area to bond padsPOLARITY: Cathode indicated by polarity bandMOUNTING POSITION: Any

*Please see P6SMB11CAT3 to P6SMB91CAT3 for Bidirectional devices.

PLASTIC SURFACE MOUNTZENER OVERVOLTAGE

TRANSIENT SUPPRESSORS5.8−171 VOLTS

600 WATT PEAK POWER

Cathode Anode

Device Package Shipping

ORDERING INFORMATION

SMBCASE 403A

PLASTIC

P6SMBxxxAT3G SMB(Pb−Free)

2,500 / Tape & Reel

A = Assembly LocationY = YearWW = Work Weekxx = Device Code (Refer to page 3)� = Pb−Free Package

MARKING DIAGRAM

(Note: Microdot may be in either location)

AYWWxx ��

SZP6SMBxxxAT3G SMB(Pb−Free)

2,500 / Tape & Reel

Littelfuse.com

Specifications subject to change without notice. © 2016 Littelfuse, Inc.September 19, 2016 − Rev. 14

jchen4

Text Box

OBSOLETE/EOL DATE June/30/2018 PCN/ECN# LFPCN41246 REPLACED BY P6SMB Series

Uni−Directional TVS

IPP

IF

V

I

IRIT

VRWMVC VBRVF

P6SMB6.8AT3G Series, SZP6SMB6.8AT3G 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 from Junction−to−Lead

PD

R�JL

3.04025

WmW/°C°C/W

DC Power Dissipation (Note 3) @ TA = 25°CDerate Above 25°C

Thermal Resistance from Junction−to−Ambient

PD

R�JA

0.554.4226

WmW/°C°C/W

Forward Surge Current (Note 4) @ TA = 25°C IFSM 100 A

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 functionalityshould not be assumed, damage may occur and reliability may be affected.1. 10 X 1000 �s, non−repetitive2. 1″ square copper pad, FR−4 board3. FR−4 board, using Littelfuse minimum recommended footprint, as shown in 403A case outline dimensions spec.4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum.

ELECTRICAL CHARACTERISTICS(TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF(Note 4) = 30 A, VF = 1.3 V Max. @ IF (Note 4) = 3 A) (Note 5)

Symbol Parameter

IPP Maximum Reverse Peak Pulse Current

VC Clamping Voltage @ IPP

VRWM Working Peak Reverse Voltage

IR Maximum Reverse Leakage Current @ VRWM

VBR Breakdown Voltage @ IT

IT Test Current

�VBR Maximum Temperature Coefficient of VBR

IF Forward Current

VF Forward Voltage @ IF5. 1/2 sine wave or equivalent, PW = 8.3 ms, non−repetitive

duty cycle




ELECTRICAL CHARACTERISTICS

Device*Device

Marking

VRWM(Note 6)

IR @VRWM

Breakdown Voltage VC @ IPP (Note 8)

�VBR

Ctyp(Note 9)VBR V (Note 7) @ IT VC IPP

V �A Min Nom Max mA V A %/°C pF

P6SMB6.8AT3GP6SMB7.5AT3GP6SMB8.2AT3GP6SMB9.1AT3G

6V8A7V5A8V2A9V1A

5.86.47.027.78

100050020050

6.457.137.798.65

6.87.518.29.1

7.147.888.619.55

1010101

10.511.312.113.4

57535045

0.0570.0610.0650.068

2380218020151835

P6SMB10AT3GP6SMB12AT3GP6SMB13AT3G

10A12A13A

8.5510.211.1

1055

9.511.412.4

1012

13.05

10.512.613.7

111

14.516.718.2

413633

0.0730.0780.081

169014351335

P6SMB15AT3GP6SMB16AT3GP6SMB18AT3GP6SMB20AT3G

15A16A18A20A

12.813.615.317.1

5555

14.315.217.119

15.05161820

15.816.818.921

1111

21.222.525.227.7

28272422

0.0840.0860.0880.09

117511101000910


22A24A27A30A

18.820.523.125.6

5555

20.922.825.728.5

2224

27.0530

23.125.228.431.5

1111

30.633.237.541.4

201816

14.4

0.0920.0940.0960.097

835775700635


33A36A39A43A

28.230.833.336.8

5555

31.434.237.140.9

33.0536

39.0543.05

34.737.841

45.2

1111

45.749.953.959.3

13.212

11.210.1

0.0980.0990.1

0.101

585540500460


47A51A56A62A

40.243.647.853

5555

44.748.553.258.9

47.0551.05

5662

49.453.658.865.1

1111

64.870.17785

9.38.67.87.1

0.1010.1020.1030.104

425395365335


68A75A91A

58.164.177.8

555

64.671.386.5

6875.05

91

71.478.895.5

111

92103125

6.55.84.8

0.1040.1050.106

305280235


100A120A130A

85.5102111

555

95114124

100120

130.5

105126137

111

137165179

4.43.63.3

0.1060.1070.107

215185170


150A160A180A

128136154

555

143152171

150.5160180

158168189

111

207219246

2.92.72.4

0.1080.1080.108

150140130

P6SMB200AT3G 200A 171 5 190 200 210 1 274 2.2 0.108 1156. 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.7. VBR measured at pulse test current IT at an ambient temperature of 25°C.8. Surge current waveform per Figure 2 and derate per Figure 3.9. Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C* Include SZ-prefix devices where applicable.




P ,

PEAK

PO

WER

(kW

)P

NONREPETITIVEPULSE WAVEFORMSHOWN IN FIGURE 2

tP, PULSE WIDTH

1

10

100

0.1 �s 1 �s 10 �s 100 �s 1 ms 10 ms0.1

Figure 1. Pulse Rating Curve

0 1 2 3 40

50

100

t, TIME (ms)

VALU

E (%

)

HALF VALUE - IPP2

PEAK VALUE - IPP

tr�≤ 10 �s

Figure 2. Pulse Waveform

TYPICAL PROTECTION CIRCUIT

Vin VL

Zin

LOAD

Figure 3. Pulse Derating Curve

PEAK

PU

LSE

DER

ATIN

G IN

% O

FPE

AK P

OW

ER O

R C

UR

REN

T @

T A=

25C°

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 ASTHAT POINT WHERE THE PEAKCURRENT DECAYS TO 50% OFIPP.

Figure 4. Typical Junction Capacitance vs.Bias Voltage

P6SMB6.8AT3G

P6SMB18AT3G

P6SMB51AT3G

P6SMB200AT3G

BIAS VOLTAGE (VOLTS)

1 10 100 1000

10

100

1000

10,000

C, C

APA

CIT

AN

CE

(pF)

1

5

TJ = 25°Cf = 1 MHz




APPLICATION NOTES

Response TimeIn most applications, the transient suppressor device is

placed in parallel with the equipment or component to beprotected. In this situation, there is a time delay associatedwith the capacitance of the device and an overshootcondition associated with the inductance of the device andthe inductance of the connection method. The capacitiveeffect is of minor importance in the parallel protectionscheme because it only produces a time delay in thetransition from the operating voltage to the clamp voltage asshown in Figure 5.

The inductive effects in the device are due to actualturn-on time (time required for the device to go from zerocurrent to full current) and lead inductance. This inductiveeffect produces an overshoot in the voltage across theequipment or component being protected as shown inFigure 6. Minimizing this overshoot is very important in theapplication, since the main purpose for adding a transientsuppressor is to clamp voltage spikes. The SMB series havea very good response time, typically < 1 ns and negligibleinductance. However, external inductive effects couldproduce unacceptable overshoot. Proper circuit layout,

minimum lead lengths and placing the suppressor device asclose as possible to the equipment or components to beprotected will minimize this overshoot.

Some input impedance represented by Zin is essential toprevent overstress of the protection device. This impedanceshould be as high as possible, without restricting the circuitoperation.

Duty Cycle DeratingThe 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 curvesof Figure 7. Average power must be derated as the lead orambient temperature rises above 25°C. The average powerderating curve normally given on data sheets may benormalized and used for this purpose.

At first glance the derating curves of Figure 7 appear to bein error as the 10 ms pulse has a higher derating factor thanthe 10 �s pulse. However, when the derating factor for agiven pulse of Figure 7 is multiplied by the peak power valueof Figure 1 for the same pulse, the results follow theexpected trend.

VL

V

Vin

Vin (TRANSIENT)VL

td

V

Vin (TRANSIENT)OVERSHOOT DUE TOINDUCTIVE EFFECTS

tD = TIME DELAY DUE TO CAPACITIVE EFFECTt t

Figure 5. Figure 6.

Figure 7. Typical Derating Factor for Duty Cycle

DE

RAT

ING

FA

CTO

R

1 ms

10 �s

10.70.5

0.3

0.05

0.1

0.2

0.01

0.020.03

0.07

100 �s

0.1 0.2 0.5 2 5 10 501 20 100D, DUTY CYCLE (%)

PULSE WIDTH10 ms




UL RECOGNITION

The entire series has Underwriters LaboratoryRecognition for the classification of protectors (QVGQ2)under the UL standard for safety 497B and File .Many competitors only have one or two devices recognizedor have recognition in a non-protective category. Somecompetitors have no recognition at all. With the UL497Brecognition, our parts successfully passed several tests

including Strike Voltage Breakdown test, EnduranceConditioning, Temperature test, DielectricVoltage-Withstand test, Discharge test and several more.

Whereas, some competitors have only passed aflammability test for the package material, we have beenrecognized for much more to be included in their Protectorcategory.



#E128662


PACKAGE DIMENSIONS

SMBCASE 403A−03

ISSUE J

E

b D

cL1L

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.

2.2610.089

2.7430.108

2.1590.085 � mm

inches�SCALE 8:1

SOLDERING FOOTPRINT

DIMA

MIN NOM MAX MINMILLIMETERS

1.95 2.30 2.47 0.077

INCHES

A1 0.05 0.10 0.20 0.002b 1.96 2.03 2.20 0.077c 0.15 0.23 0.31 0.006D 3.30 3.56 3.95 0.130E 4.06 4.32 4.60 0.160

L 0.76 1.02 1.60 0.030

0.091 0.0970.004 0.0080.080 0.0870.009 0.0120.140 0.1560.170 0.181

0.040 0.063

NOM MAX

5.21 5.44 5.60 0.205 0.214 0.220HE

0.51 REF 0.020 REF

D

L1

HE

POLARITY INDICATOROPTIONAL AS NEEDED



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.

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P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series 600 Watt Peak .../media/electronics/datasheets/tvs... · P6SMB6.8AT3/D P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series 600 Watt Peak Power Zener