SMAJ250A - Littelfuse

Revision: November 17, 2011, 16:25

Speciﬁcations are subject to change without notice.

Transient Voltage Suppression Diodes

SMAJ Series

Surface Mount – 400W > SMAJ series

Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.

SMAJ Series

Description

Agency Approvals

AGENCY AGENCY FILE NUMBER

E230531

Features

Maximum Ratings and Thermal Characteristics

(TA=25OC unless otherwise noted)

Parameter Symbol Value Unit

Peak Pulse Power Dissipation at

TA=25ºC by 10x1000µs waveform

(Fig.1)(Note 1), (Note 2)

PPPM 400 W

Power Dissipation on inﬁnite heat

sink at TA=50OCPM(AV) 3.3 W

Peak Forward Surge Current, 8.3ms

Single Half Sine Wave (Note 3) IFSM 40 A

Maximum Instantaneous Forward

Voltage at 25A for Unidirectional

only (Note 4)

VF3.5V/6.5 V

Operating Junction and Storage

Temperature Range TJ, TSTG -65 to 150 °C

Typical Thermal Resistance Junction

to Lead RuJL 30 °C/W

Typical Thermal Resistance Junction

to Ambient RuJA 120 °C/W

Notes:

1. Non-repetitive current pulse, per Fig.3 and derated above TA=25ºC per Fig. 2.

2. Mounted on 5.0x5.0mm copper pad to each terminal.

3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional

device only.

4. VF < 3.5V for VBR _

200V and VF< 6.5V for VBR _

201V.

The SMAJ series is designed speciﬁcally to protect

sensitive electronic equipment from voltage transients

induced by lightning and other transient voltage events.

Applications

TVS devices are ideal for the protection of I/O Interfaces,

VCC bus and other vulnerable circuits used in Telecom,

Computer, Industrial and Consumer electronic applications.

• Halogen-Free

• RoHS compliant

• For surface mounted

applications to optimize

board space

• Low prole package

• Built-in strain relief

• Glass passivated junction

• Low inductance

• Excellent clamping

capability

• 400W Peak Pulsepower

capability at 10 x 1000µs

waveform, repetition rate

(duty cycle): 0.01%

• Fast response time:

typically less than 1.0ps

from 0 Volts to VBR min

• Typical IR less than 1µA

above 12V

• High temperature

soldering: 260°C/40

seconds at terminals

• Typical maximum

temperature coefﬁcient

ΔVBR = 0.1% x VBR@25°C x ΔT

• Plastic package has

Underwriters Laboratory

Flammability 94V-O

• Matte Tin Lead–free

Plated

SMAJ Series

RoHS

Revision: November 17, 2011, 16:25

Speciﬁcations are subject to change without notice.

Transient Voltage Suppression Diodes

SMAJ Series

Surface Mount – 400W > SMAJ series

Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.

Electrical Characteristics

Part

Number

(Uni)

Part

Number

(Bi)

Marking Reverse

Stand off

Voltage VR

(Volts)

Breakdown

Voltage VBR

(Volts) @ IT

Test

Current

(mA)

Maximum

Clamping

Voltage VC

@ Ipp

(V)

Maximum

Peak

Pulse

Current Ipp

(A)

Maximum

Reverse

Leakage IR

@ VR

(µA)

Agency

Approval

UNI BI MIN MAX

SMAJ5.0A SMAJ5.0CA AE WE 5.0 6.40 7.00 10 9.2 43.5 800 X

SMAJ6.0A SMAJ6.0CA AG WG 6.0 6.67 7.37 10 10.3 38.8 800 X

SMAJ6.5A SMAJ6.5CA AK WK 6.5 7.22 7.98 10 11. 2 35.7 500 X

SMAJ7.0A SMAJ7.0CA AM WM 7. 0 7.78 8.60 10 12.0 33.3 200 X

SMAJ7.5A SMAJ7.5CA AP WP 7. 5 8.33 9.21 1 12.9 31.0 100 X

SMAJ8.0A SMAJ8.0CA AR WR 8.0 8.89 9.83 1 13.6 29.4 50 X

SMAJ8.5A SMAJ8.5CA AT WT 8.5 9.44 10.40 1 14.4 27.8 20 X

SMAJ9.0A SMAJ9.0CA AV WV 9.0 10.00 11.10 1 15.4 26.0 10 X

SMAJ10A SMAJ10CA AX WX 10.0 11.10 12.30 1 1 7. 0 23.5 5 X

SMAJ11A SMAJ11CA AZ WZ 11. 0 12.20 13.50 1 18.2 22.0 1 X

SMAJ12A SMAJ12CA BE XE 12.0 13.30 14.70 1 19.9 20.1 1 X

SMAJ13A SMAJ13CA BG XG 13.0 14.40 15.90 1 21.5 18.6 1 X

SMAJ14A SMAJ14CA BK XK 14.0 15.60 17.20 1 23.2 1 7. 2 1 X

SMAJ15A SMAJ15CA BM XM 15.0 16.70 18.50 1 24.4 16.4 1 X

SMAJ16A SMAJ16CA BP XP 16.0 17.80 19.70 1 26.0 15.4 1 X

SMAJ17A SMAJ17CA BR XR 1 7. 0 18.90 20.90 1 27.6 14.5 1 X

SMAJ18A SMAJ18CA BT XT 18.0 20.00 22.10 1 29.2 13.7 1 X

SMAJ20A SMAJ20CA BV XV 20.0 22.20 24.50 1 32.4 12.3 1 X

SMAJ22A SMAJ22CA BX XX 22.0 24.40 26.90 1 35.5 11. 3 1 X

SMAJ24A SMAJ24CA BZ XZ 24.0 26.70 29.50 1 38.9 10.3 1 X

SMAJ26A SMAJ26CA CE YE 26.0 28.90 31.90 1 42.1 9.5 1 X

SMAJ28A SMAJ28CA CG YG 28.0 31.10 34.40 1 45.4 8.8 1 X

SMAJ30A SMAJ30CA CK YK 30.0 33.30 36.80 1 48.4 8.3 1 X

SMAJ33A SMAJ33CA CM YM 33.0 36.70 40.60 1 53.3 7. 5 1 X

SMAJ36A SMAJ36CA CP YP 36.0 40.00 44.20 1 58.1 6.9 1 X

SMAJ40A SMAJ40CA CR YR 40.0 44.40 49.10 1 64.5 6.2 1 X

SMAJ43A SMAJ43CA CT YT 43.0 47.80 52.80 1 69.4 5.8 1 X

SMAJ45A SMAJ45CA CV YV 45.0 50.00 55.30 1 72.7 5.5 1 X

SMAJ48A SMAJ48CA CX YX 48.0 53.30 58.90 1 77.4 5.2 1 X

SMAJ51A SMAJ51CA CZ YZ 51.0 56.70 62.70 1 82.4 4.9 1 X

SMAJ54A SMAJ54CA RE ZE 54.0 60.00 66.30 1 87.1 4.6 1 X

SMAJ58A SMAJ58CA RG ZG 58.0 64.40 71.20 1 93.6 4.3 1 X

SMAJ60A SMAJ60CA RK ZK 60.0 66.70 73.70 1 96.8 4.1 1 X

SMAJ64A SMAJ64CA RM ZM 64.0 71.10 78.60 1 103.0 3.9 1 X

SMAJ70A SMAJ70CA RP ZP 70.0 77.80 86.00 1 113.0 3.5 1 X

SMAJ75A SMAJ75CA RR ZR 75.0 83.30 92.10 1 121.0 3.3 1 X

SMAJ78A SMAJ78CA RT ZT 78.0 86.70 95.80 1 126.0 3.2 1 X

SMAJ85A SMAJ85CA RV ZV 85.0 94.40 104.00 1 137.0 2.9 1 X

SMAJ90A SMAJ90CA RX ZX 90.0 100.00 111.0 0 1 146.0 2.7 1 X

SMAJ100A SMAJ100CA RZ ZZ 100.0 111.0 0 123.00 1 162.0 2.5 1 X

SMAJ110A SMAJ110CA SE VE 110.0 122.00 135.00 1 177.0 2.3 1 X

SMAJ120A SMAJ120CA SG VG 120.0 133.00 147.00 1 193.0 2.1 1 X

SMAJ130A SMAJ130CA SK VK 130.0 144.00 159.00 1 209.0 1. 9 1 X

SMAJ150A SMAJ150CA SM VM 150.0 167.00 185.00 1 243.0 1. 6 1 X

SMAJ160A SMAJ160CA SP VP 160.0 178.00 197.00 1 259.0 1. 5 1 X

SMAJ170A SMAJ170CA SR VR 170.0 189.00 209.00 1 275.0 1. 5 1 X

SMAJ180A SMAJ180CA ST VT 180.0 201.00 222.00 1 292.0 1. 4 1

SMAJ200A SMAJ200CA SV VV 200.0 224.00 247.00 1 324.0 1. 2 1

SMAJ220A SMAJ220CA SX VX 220.0 246.00 272.00 1 356.0 1. 1 1

SMAJ250A SMAJ250CA SZ VZ 250.0 279.00 309.00 1 405.0 1. 0 1

SMAJ300A SMAJ300CA TE UE 300.0 335.00 371.00 1 486.0 0.8 1

SMAJ350A SMAJ350CA TG UG 350.0 391.00 432.00 1 567.0 0.7 1

SMAJ400A SMAJ400CA TK UK 400.0 447.00 494.00 1 648.0 0.6 1

SMAJ440A SMAJ440CA TM UM 440.0 492.00 543.00 1 713.0 0.6 1

For bidirectional type having VRWM of 10 volts and less, the IR limit is double.

For parts without A (VBR is ± 10% and VC is 5% higher than with A parts).

Revision: November 17, 2011, 16:25

Speciﬁcations are subject to change without notice.

Transient Voltage Suppression Diodes

SMAJ Series

Surface Mount – 400W > SMAJ series

Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.

Ratings and Characteristic Curves (TA=25°C unless otherwise noted)

100

0255075100 125150 175

TA-Ambient temperature (ºC)

Peak Pulse Power (PPP) or Current (IPP)

Derating in Percentage %

100

1000

10000

1.010.0100.01000.0

Cj (pF)

Tj=25ºC

f=1.0MHz

Vsig=50mVp-p

Uni-directional V=0V

Bi-directional V=0V

Uni-directional @V

Bi-directional @V

- Reverse Breakdown Voltage (V)

0.1

0.0000010.000010.0001 0.001

td-Pulse Width (sec.)

PPPM-Peak Pulse Power (kW)

0.2x0.2" (5.0x5.0mm)

Copper Pad Area

Figure 1 - Peak Pulse Power Rating Curve Figure 2 - Pulse Derating Curve

IPPM- Peak Pulse Current, % IRSM

100

150

1.0 2.0 3.0 4.0

tr=10µsec

Peak Value

IPPM

TJ=25°C

Pulse Width(td) is deﬁned

as the point where the peak

current decays to 50% of IPPM

10/1000µsec. Waveform

as deﬁned by R.E.A

t-Time (ms)

Half Value

IPPM ( )

Figure 3 - Pulse Waveform Figure 4 - Typical Junction Capacitance

0255075100 125 150 175

PM(AV), Steady State Power Dissipation (W)

TA - Ambient Te mperature (ºC)

bargaining

3.0

0.6

1.2

1.8

3.6

2.4

Figure 5 - Steady State Power Dissipation Derating

Curve

110100

Number of Cycles at 60 Hz

IFSM - Peak Forward Surve Current

(A)

Figure 6 - Maximum Non-Repetitive Forward Surge

Current Uni-Directional Only

Revision: November 17, 2011, 16:25

Speciﬁcations are subject to change without notice.

Transient Voltage Suppression Diodes

SMAJ Series

Surface Mount – 400W > SMAJ series

Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.

Dimensions

Physical Speciﬁcations

Weight 0.002 ounce, 0.061 gram

Case JEDEC DO-214AC Molded Plastic over

glass passivated junction

Polarity Color band denotes cathode except Bipolar

Terminal Matte Tin-plated leads, Solderable per

JESD22-B102D

Dimensions Inches Millimeters

Min Max Min Max

A 0.049 0.065 1.250 1.650

B 0.157 0.177 3.990 4.500

C 0.100 0.110 2.540 2.790

D 0.078 0.090 1.980 2.290

E0.030 0.060 0.780 1.520

F - 0.008 - 0.203

G 0.194 0.208 4.930 5.280

H 0.006 0.012 0.152 0.305

I 0.070 - 1.800 -

J 0.082 - 2.100 -

K - 0.090 - 2.300

L 0.082 - 2.100 -

Environmental Speciﬁcations

Temperature Cycle JESD22-A104

Pressure Cooker JESD22-A102

High Temp. Storage JESD22-A103

HTRB JESD22-A108

Thermal Shock JESD22-A106

Soldering Parameters

Temperature (T)

Time (t)

Ts(min)

Ts(max)

Preheat

Ramp-up Critical Zone

TL to TP

Ramp-down

t 25˚C to Peak

25˚C

Reﬂow Condition Lead–free assembly

Pre Heat

- Temperature Min (Ts(min))150°C

- Temperature Max (Ts(max))200°C

- Time (min to max) (ts)60 – 180 secs

Average ramp up rate (Liquidus Temp

(TL) to peak 3°C/second max

TS(max) to TL - Ramp-up Rate 3°C/second max

Reﬂow - Temperature (TL) (Liquidus) 217°C

- Time (min to max) (ts)60 – 150 seconds

Peak Temperature (TP)260+0/-5 °C

Time within 5°C of actual peak

Temperature (tp)20 – 40 seconds

Ramp-down Rate 6°C/second max

Time 25°C to peak Temperature (TP)8 minutes Max.

Do not exceed 280°C

DO-214AC (SMA)

Cathode Band

(all dimensions in mm)

Solder Pads

Revision: November 17, 2011, 16:25

Speciﬁcations are subject to change without notice.

Transient Voltage Suppression Diodes

SMAJ Series

Surface Mount – 400W > SMAJ series

Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.

Part Numbering System

VOLTAGE

BI-DIRECTIONAL

5% VOLTAGE TOLERANCE

SMAJ XXX C A

SERIES

Part Marking System

Packaging

Marking Code

Littelfuse Logo

Cathode Band

XXXXX

Trace Code Marking

Tape and Reel Speciﬁcation

0.47

(12.0)

0.157

(4.0)

0.157

(4.0)

0.49

(12.5)

0.80 (20.2)

Arbor Hole Dia.

13.0 (330)

Dimensions are in inches

(and millimeters).

Direction of Feed

0.059 DIA

(1.5) Cover tape

Part number Component

Package Quantity Packaging

Option

Packaging

Speciﬁcation

SMAJ-xxxXX DO-214AC 5000 Tape & Reel - 12mm/13” tape EIA STD RS-481

Cathode