© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Surface Mount > 400W > 1SMA5.0AT3G Series
• Working Peak Reverse Voltage Range − 5.0 V to 78 V
• Standard Zener Breakdown Voltage Range −
6.7 V to 91.25 V
• Peak Power − 400 W @ 1 ms
• ESD Rating of Class 3 (> 16 kV) per Human Body Model
• Response Time is Typically < 1 ns
• Flat Handling Surface for Accurate Placement
• Package Design for Top Slide or Bottom Circuit
Board Mounting
• Low Profile Package
• These are Pb−Free Device
Features
The 1SMA5.0AT3G 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 1SMA5.0AT3G 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.
Description
Parameter Symbol Value Unit
Peak Power Dissipation (Note 1) @ TL =
25°C, Pulse Width = 1 ms PPK 400 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
1.0
20
50
W
mW/°C
°C/W
DC Power Dissipation (Note 3)
@ TA = 25°C
Derate Above 25°C
Thermal Resistance from Junction–to–
Ambient
PD
R0JA
0.5
4.0
250
W
mW/°C
°C/W
Forward Surge Current (Note 4) @ TA
= 25°CIFSM 40 A
Operating and Storage Temperature
Range TJ, Tstg
-65 to
+150 °C
Maximum Ratings and Thermal Characteristics
1SMA5.0AT3G Series
Functional Diagram
Bi-directional
Uni-directional
Cathode Anode
Pb
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 µs, non−repetitive.
2. 1” square copper pad, FR−4 board.
3. FR−4 board, using Littelfuse minimum recommended footprint, as shown in 403D-02
case outline dimensions spec.
4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per
minute maximum.
Additional Information
Samples
Resources
Datasheet
OBSOLETE/EOL
DATE June/30/2018 PCN/ECN# LFPCN41246
REPLACED BY SMAJ Series
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Surface Mount > 400W > 1SMA5.0AT3G Series
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
IFMaximum Temperature Coefficient of VBR
VFForward Voltage @ IF
5. 1/2 sine wave or equivalent, PW = 8.3 ms non−repetitive duty cycle
IPP
IF
V
I
IR
IT
VRWM
VCVBR
VF
I-V Curve Characteristics (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF = 30 A for all types) (Note 5)
5. 1/2 sine wave or equivalent, PW = 8.3 ms, non−repetitive duty cycle.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Surface Mount > 400W > 1SMA5.0AT3G Series
Electrical Characteristics
Breakdown Voltage VC @ IPP
(Note 8)
Device* Device
Marking
V
RWM
(Note 6)
IR @
VRWM
VBR @ IT (V) (Note 7) @ ITVCIPP
C Typ.
(Note 9)
Volts µA MIN NOM MAX mA Volts Amps pF
1SMA5.0AT3G QE 5.0 400 6.4 6.7 7.0 10 9.2 43.5 2035
1SMA6.0AT3G QG 6.0 400 6.67 7.02 7.37 10 10.3 38.8 1730
1SMA6.5AT3G QK 6.5 250 7.22 7.6 7.98 10 11.2 35.7 1605
1SMA8.0AT3G QR 8.0 25 8.89 9.36 9.83 113.6 29.4 1035
1SMA8.5AT3G QT 8.5 5.0 9.44 9.92 10.4 114.4 27.8 1265
1SMA9.0AT3G QV 9.0 2.5 10 10.55 11.1 115.4 26.0 1200
1SMA10AT3G QX 10 2.5 11.1 11.7 12.3 117.0 23.5 1090
1SMA11AT3G QZ 11 2.5 12.2 12.85 13.5 118.2 22.0 1000
1SMA12AT3G RE 12 2.5 13.3 14.0 14.7 119.9 20.1 925
1SMA13AT3G RG 13 2.5 14.4 15.15 15.9 121.5 18.6 860
1SMA14AT3G RH 14 2.5 15.6 16.4 17.2 123.2 17.2 800
1SMA15AT3G RM 15 2.5 16.7 17.6 18.5 124.4 16.4 758
1SMA16AT3G RP 16 2.5 17.8 18.75 19.7 126.0 15.4 715
1SMA17AT3G RR 17 2.5 18.9 19.9 20.9 127.6 14.5 680
1SMA18AT3G RT 18 2.5 20 21.05 22.1 129.2 13.7 645
1SMA20AT3G RV 20 2.5 22.2 23.35 24.5 132.4 12.3 585
1SMA22AT3G RX 22 2.5 24.4 25.65 26.9 135.5 11.3 540
1SMA24AT3G RZ 24 2.5 26.7 28.1 29.5 138.9 10.3 500
1SMA26AT3G SE 26 2.5 28.9 30.4 31.9 142.1 9.5 460
1SMA28AT3G SG 28 2.5 31.1 32.75 34.4 145.4 8.8 430
1SMA30AT3G SK 30 2.5 33.3 35.05 36.8 148.4 8.3 405
1SMA33AT3G SM 33 2.5 36.7 38.65 40.6 153.3 7.5 375
1SMA36AT3G SP 36 2.5 40 42.1 44.2 158.1 6.9 345
1SMA40AT3G SR 40 2.5 44.4 46.75 49.1 164.5 6.2 315
1SMA43AT3G ST 43 2.5 47.8 50.3 52.8 169.4 5.8 295
1SMA45AT3G SV 45 2.5 50 52.65 55.3 172.2 5.5 280
1SMA48AT3G SX 48 2.5 53.3 56.1 58.9 177.4 5.2 265
1SMA54AT3G TE 54 2.5 60 63.15 66.3 187.1 4.6 240
1SMA58AT3G TG 58 2.5 64.4 67.8 71.5 193.6 4.3 225
1SMA70AT3G TP 70 2.5 77.8 81.9 86.0 1113 3.5 190
6. 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. V BR 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 = 1.0 MHz, TJ = 25°C.
†Please see 1SMA10CAT3 to 1SMA75CAT3 for Bidirectional devices.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Surface Mount > 400W > 1SMA5.0AT3G Series
Figure 1. Pulse Rating Curve
Ratings and Characteristic Curves
Figure 2. Pulse Waveform
Figure 3 - Pulse Derating Curve Figure 4. Typical Junction Capacitance vs. Bias Voltage
Figure 5. Steady State Power Derating
10 40.11 10
tP
, PULSE WIDTH (ms)
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2.
TA = 25°C
0.010.001
100
10
1
0.1
Ppk, PEAK POWER (kW)
10,000
1,000
100
1
001011
BIAS VOLTAGE (VOLTS)
1SMA5.0AT3G
TJ = 25°C
F = 1 MHz
C, CAPACITANCE (pF)
10
1SMA10AT3G
1SMA36AT3G
1SMA64AT3G
0
6
T, TEMPERATURE (°C)
50 100 150
PD, MAXIMUM POWER DISSIPATION (WATTS)
5
4
3
2
0
1
@ TL = 75°C
PD = 1.5 W
@ TA = 25°C
PD = 0.5 W
25 75 125
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Surface Mount > 400W > 1SMA5.0AT3G Series
Dimensions
Part Marking System
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION b SHALL BE MEASURED WITHIN DIMENSION L.
STYLE 1:
PIN 1. CATHODE (POLARITY BAND)
2. ANODE
Soldering Footrpint
Physical Specifications
Case Void-free, transfer-molded, thermosetting
plastic
Polarity Cathode indicated by molded polarity
notch
Mounting Position Any
Finish All external surfaces are corrosion
resistant and leads are readily solderable
ORDERING INFORMATION
Device Package Shipping†
1SMAxxAT3G SMA
(Pb−Free)
5,000 /
Tape & Reel
Dim
Inches Millimeters
Min Nom Max Min Nom Max
A0.078 0.083 0.087 1.97 2.10 2.20
A1 0.002 0.004 0.008 0.05 0.10 0.20
b0.050 0.057 0.064 1.27 1.45 1.63
c0.006 0.011 0.016 0.15 0.28 0.41
D0.090 0.103 0.115 2.29 2.60 2.92
E0.160 0.170 0.18 0 4.06 4.32 4.57
HE0.190 0.205 0.220 4.83 5.21 5.59
L0.030 0.045 0.060 0.76 1. 14 1.52
E
bD
Lc
A
A1
POLARITY INDICATOR
OPTIONAL AS NEEDED
(SEE STYLES)
HE
4.000
0.157
2.000
0.079
2.000
0.079
mm
inches
SCALE 8:1
Flow/Wave Soldering (Solder Dipping)
Peak Temperature : 260OC
Dipping Time : 10 seconds
D
xx
AY
WW
xx = Device Code (Refer to page 3)
A= Assembly Location
Y= Year
WW = Work Week
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete
Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics.
