© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB Series
• Zener Transient
Overvoltage Suppressors
• Working Peak Reverse
Voltage Range − 5.0 V to
170 V for uni-directional,
and 10 V to 75 V for
bi-directional
• Standard Avalanche
Breakdown Voltage
Range −6.4 V to 209 V for
uni-directional, 11.1 V to
92.07 V for
bi-directional
• Peak Power − 600 W @
1.0 ms
• ESD Rating of Class 3 (>
16 kV) per Human Body
Model
• Maximum Clamp Voltage
@ Peak Pulse Current
• Low Leakage < 5.0 µA
Above 10 V
• Intended for UL 497B Type
Protection
• Response Time is Typically
< 1.0 ns
• Pb-free means 2nd level
interconnect is Pb-free
and the terminal finish
material is tin(Sn) (IPC/
JEDEC J-STD-609A.01)
• SZ Prefix for Automotive
and Other Applications
Requiring Unique Site
and Control Change
Requirements;
AEC−Q101 Qualified and
PPAP Capable
Features
The SZ1SMB series is designed to protect voltage
sensitive components from high voltage, high energy
transients. They have excellent clamping and high surge
capability, as well as fast response time. The SZ1SMB
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 and consumer
applications.
Description
Parameter 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
RƟJL
3.0
40
25
W
mW/°C
°C/W
DC Power Dissipation(Note 3) @ TA = 25°C
Derate Above 25°C
Thermal Resistance from Junction–to– Ambient
PD
RƟJA
0.55
4.4
226
W
mW/°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
Maximum Ratings and Thermal Characteristics
SZ1SMB Series
Stresses exceeding those listed in the Maximum Ratings table may damage the componant. If any of these limits
are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.
1. 10/1000 µs, non−repetitive.
2. 1” square copper pad, FR−4 board.
3. FR−4 board, using Littelfuse minimum recommended footprint
4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum - For
Unidirectional only.
Additional Information
Samples
Resources
Datasheet
Bi-directional
Uni-directional
Agency Approvals
Agency Agency File Number
E128662
Pb
e3
RoHS
Functional Diagram
Bi-directional
Uni-directional
Cathode Anode
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB 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
ITBreakdown Current
VFForward Voltage @ IF
IFForward Current
I-V Curve Characteristics (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 5) = 30 A) For Uni-directional
5. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, non−repetitive duty cycle.
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
ITOn-State Current
I-V Curve Characteristics (TA = 25°C unless otherwise noted) For Bi-directional
Vc V
BR
V
R
I
R
I
T
I
pp
V
Vc
V
BR
V
R
I
pp
I
R
I
T
Bi-directional
Vc VBR VR
IR
IT
Ipp
V
Uni-directional
VF
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB Series
Electrical Characteristics - For Uni-directional
Device Device
Marking
VRWM
(Note 6)
IR @
VRWM
Breakdown Voltage VC @ IPP
(Note 8) Capacitance
(Typical)(Note 9)
VBR @ IT (V) (Note 7) @ ITVCIPP
Volts µA Min Nom Max mA Volts Amps pF
SZ1SMB5.0AT3G KE 5.0 800 6.40 6.70 7. 0 0 10 9.2 65.2 2700
SZ1SMB6.0AT3G KG 6.0 800 6.67 7.02 7.37 10 10.3 58.3 2300
SZ1SMB6.5AT3G KK 6.5 500 7.22 7.60 7.98 10 11. 2 53.6 2140
SZ1SMB7.0AT3G KM 7. 0 500 7.78 8.19 8.60 10 12.0 50.0 2005
SZ1SMB7.5AT3G KP 7. 5 100 8.33 8.77 9.21 1. 0 12.9 46.5 1890
SZ1SMB8.0AT3G KR 8.0 50 8.89 9.36 9.83 1. 0 13.6 44.1 1780
SZ1SMB8.5AT3G KT 8.5 10 9.44 9.92 10.40 1. 0 14.4 41.7 1690
SZ1SMB9.0AT3G KV 9.0 5.0 10.00 10.55 11. 10 1. 0 15.4 39.0 1605
SZ1SMB10AT3G KX 10 5.0 11. 10 11.70 12.30 1. 0 1 7. 0 35.3 1460
SZ1SMB11AT3G KZ 11 5.0 12.20 12.85 13.50 1. 0 18.2 33.0 1345
SZ1SMB12AT3G LE 12 5.0 13.30 14.00 14.70 1. 0 19.9 30.2 1245
SZ1SMB13AT3G LG 13 5.0 14.40 15.15 15.90 1. 0 21.5 27.9 116 0
SZ1SMB14AT3G LK 14 5.0 15.60 16.40 17.20 1. 0 23.2 25.8 1085
SZ1SMB15AT3G LM 15 5.0 16.70 17.60 18.50 1. 0 24.4 24.0 1020
SZ1SMB16AT3G LP 16 5.0 17.80 18.75 19.70 1. 0 26.0 23.1 965
SZ1SMB17AT3G LR 17 5.0 18.90 19.90 20.90 1. 0 27.6 21.7 915
SZ1SMB18AT3G LT 18 5.0 20.00 21.05 22.10 1. 0 29.2 20.5 870
SZ1SMB20AT3G LV 20 5.0 22.20 23.35 24.50 1. 0 32.4 18.5 790
SZ1SMB22AT3G LX 22 5.0 24.40 25.65 26.90 1. 0 35.5 16.9 730
SZ1SMB24AT3G LZ 24 5.0 26.70 28.10 29.50 1. 0 38.9 15.4 675
SZ1SMB26AT3G ME 26 5.0 28.90 30.40 31.90 1. 0 42.1 14.2 630
SZ1SMB28AT3G MG 28 5.0 31.10 32.75 34.40 1. 0 45.4 13.2 590
SZ1SMB30AT3G MK 30 5.0 33.30 35.05 36.80 1. 0 48.4 12.4 555
SZ1SMB33AT3G MM 33 5.0 36.70 38.65 40.60 1. 0 53.3 11. 3 510
SZ1SMB36AT3G MP 36 5.0 40.00 42.10 44.20 1. 0 58.1 10.3 470
SZ1SMB40AT3G MR 40 5.0 44.40 46.75 49.10 1. 0 64.5 9.3 430
SZ1SMB43AT3G MT 43 5.0 47.80 50.30 52.80 1. 0 69.4 8.6 400
SZ1SMB45AT3G MV 45 5.0 50.00 52.65 55.30 1. 0 72.7 8.3 385
SZ1SMB48AT3G MX 48 5.0 53.30 56.10 58.90 1. 0 77.4 7. 7 365
SZ1SMB51AT3G MZ 51 5.0 56.70 59.70 62.70 1. 0 82.4 7. 3 345
SZ1SMB54AT3G NE 54 5.0 60.00 63.15 66.30 1. 0 87.1 6.9 330
SZ1SMB58AT3G NG 58 5.0 64.40 67.80 71.20 1. 0 93.6 6.4 310
SZ1SMB60AT3G NK 60 5.0 66.70 70.20 73.70 1. 0 96.8 6.2 300
SZ1SMB64AT3G NM 64 5.0 71.10 74.85 78.60 1. 0 103 5.8 280
SZ1SMB70AT3G NP 70 5.0 77.80 81.90 86.00 1. 0 113 5.3 260
SZ1SMB75AT3G NR 75 5.0 83.30 87.70 92.10 1. 0 121 4.9 245
SZ1SMB85AT3G NV 85 55.0 94.40 99.20 104.00 1. 0 137 4.4 220
SZ1SMB90AT3G NX 90 5.0 100.00 105.50 111.0 0 1. 0 146 4.1 210
SZ1SMB100AT3G NZ 100 5.0 111. 0 0 11 7. 0 0 123.00 1. 0 162 3.7 190
SZ1SMB110AT3G PE 110 5.0 122.00 128.50 135.00 1. 0 177 3.4 175
SZ1SMB120AT3G PG 120 5.0 133.00 140.00 147.00 1. 0 193 3.1 160
SZ1SMB130AT3G PK 130 5.0 144.00 151.50 159.00 1. 0 209 2.9 150
SZ1SMB150AT3G PM 150 5.0 167.00 176.00 185.00 1. 0 243 2.5 135
SZ1SMB160AT3G PP 160 5.0 178.00 187.50 197.00 1. 0 259 2.3 125
SZ1SMB170AT3G PR 170 5.0 189.00 199.00 209.00 1. 0 275 2.2 120
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB Series
Electrical Characteristics - For Bi-directional
Device Device
Marking
VRWM
(Note 6)
IR @
VRWM
Breakdown Voltage VC @ IPP
(Note 8)
VBR @ IT (V) (Note 7) @ ITVCIPP
Volts µA MIN NOM MAX mA Volts Amps
SZ1SMB10CAT3G KXC 10 5.0 11. 1 11.69 12.27 1. 0 1 7. 0 35.3
SZ1SMB11CAT3G KZC 11 5.0 12.2 12.84 13.5 1. 0 18.2 33.0
SZ1SMB12CAT3G LEC 12 5.0 13.3 14.00 14.7 1. 0 19.9 30.2
SZ1SMB13CAT3G LGC 13 5.0 14.4 15.16 15.9 1. 0 21.5 27.9
SZ1SMB14CAT3G LKC 14 5.0 15.6 16.42 1 7. 2 1. 0 23.2 25.8
SZ1SMB15CAT3G LMC 15 5.0 16.7 17.58 18.5 1. 0 24.4 24.0
SZ1SMB16CAT3G LPC 16 5.0 1 7. 8 18.74 19.7 1. 0 26.0 23.1
SZ1SMB17CAT3G LRC 17 5.0 18.9 19.90 20.9 1. 0 27.6 21.7
SZ1SMB18CAT3G LTC 18 5.0 20.0 21.06 22.1 1. 0 29.2 20.5
SZ1SMB20CAT3G LVC 20 5.0 22.2 23.37 24.5 1. 0 32.4 18.5
SZ1SMB22CAT3G LXC 22 5.0 24.4 25.69 27.0 1. 0 35.5 16.9
SZ1SMB24CAT3G LZC 24 5.0 26.7 28.11 29.5 1. 0 38.9 15.4
SZ1SMB26CAT3G MEC 26 5.0 28.9 30.42 31.9 1. 0 42.1 14.2
SZ1SMB28CAT3G MGC 28 5.0 31.1 32.74 34.4 1. 0 45.4 13.2
SZ1SMB30CAT3G MKC 30 5.0 33.3 35.06 36.8 1. 0 48.4 12.4
SZ1SMB33CAT3G MMC 33 5.0 36.7 38.63 40.6 1. 0 53.3 11. 3
SZ1SMB36CAT3G MPC 36 5.0 40.0 42.11 44.2 1. 0 58.1 10.3
SZ1SMB40CAT3G MRC 40 5.0 44.4 46.74 49.1 1. 0 64.5 9.3
SZ1SMB43CAT3G MTC 43 5.0 47.8 50.32 52.8 1. 0 69.4 8.6
SZ1SMB45CAT3G MVC 45 5.0 50.0 52.63 55.3 1. 0 72.2 8.3
SZ1SMB48CAT3G MXC 48 5.0 53.3 56.11 58.9 1. 0 77.4 7. 7
SZ1SMB51CAT3G MZC 51 5.0 56.7 59.69 62.7 1. 0 82.4 7. 3
SZ1SMB54CAT3G NEC 54 5.0 60.0 63.16 66.32 1. 0 87.1 6.9
SZ1SMB58CAT3G NGC 58 5.0 64.4 67.79 71.18 1. 0 93.6 6.4
SZ1SMB60CAT3G NKC 60 5.0 66.7 70.21 73.72 1. 0 96.8 6.2
SZ1SMB64CAT3G NMC 64 5.0 71.1 74.84 78.58 1. 0 103 5.8
SZ1SMB75CAT3G NRC 75 5.0 83.3 91.65 92.07 1. 0 121 4.9
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. VBR measured at pulse test current IT at an ambient temperature of 25°C.
8. Surge current waveform per Figure 1 and derate per Figure 3 of the General Data − 600 Watt at the beginning of this group.
9. Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB Series
Ratings and Characteristic Curves
Figure 4. Typical Junction Capacitance vs. Bias Voltage
Figure 6. Typical Protection Circuit
Zin
V
in Load VL
Figure 1. Pulse Rating Curve
0.1
1.0
10.0
100.0
0.0001 0.001 0.01 0.1 1 10
Ppk, Peak Power (KW)
tp, Pulse Width(ms)
Non-Repetitive
Pulse Waveform
Figure 3. Surge Derating Curve
0
20
40
60
80
100
120
0 25 50 75 100 125 150 175
10/1000 WAVEFORM
T
A
Ambient Temperature(˚C)
Peak Pulse Derating in %
of Peak Current
Figure 2. Pulse Waveform
Pulse Width (tP) is defined as
that point where the peak
current decays to 50% of IPP
tr ≤10μs
Peak Value . IPP
Half Value . IPP
2
tP
t, Time (ms)
Value (%)
Figure 5. Typical Junction Capacitance vs. Bias Voltage
1,000
100
1
10
Bias Voltage (Volts)
F = 1 MHz
TJ= 25°C
10
SZ1SMB10CAT3G
SZ1SMB18CAT3G
SZ1SMB48CAT3G
SZ1SMB75CAT3G
1 100
C, Capacitance (pF)
10,000
100
1
10
Bias Voltage (Volts)
10
1100
C, Capacitance (pF)
SZ1SMB5.0AT3G
SZ1SMB10AT3G
SZ1SMB48AT3G
SZ1SMB170AT3G
1,000
100
F = 1 MHz
TJ= 25°C
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB Series
Physical Specifications
Weight 0.00326 ounce, 0.1015 grams
Case JEDEC DO214AA. Void-Free, Transfer-Molded, Thermosetting
Plastic Epoxy Meets UL 94V-0
Polarity Color band denotes cathode for unidirectional components.
Terminal Matte Tin-plated leads, Solderable per, JESD22-B102
Soldering Parameters
Temperature (T)
Time (t)
Ts(min)
Ts(max)
TL
TP
ts
Preheat
tL
tp
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 – 120 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) (tL)60 – 150 seconds
Peak Temperature (TP)260+0/-5 °C
Time within 5°C of actual peak Temperature (tp)30 seconds max
Ramp-down Rate 6°C/second max
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Environmental Specifications
High Temp. Storage JESD22-A103
HTRB JESD22-A108
Temperature Cycling JESD22-A104
MSL JEDEC-J-STD-020, Level 1
H3TRB JESD22-A101
RSH JESD22-A111
Dimensions
Dim Inches Millimeters
Min Nom Max Min Nom Max
A0.077 0.091 0.097 1.95 2.30 2.47
A1 0.002 0.004 0.008 0.05 0.10 0.20
b0.077 0.080 0.087 1.96 2.03 2.20
c0.006 0.009 0.012 0.15 0.23 0.31
D0.130 0.140 0.156 3.30 3.56 3.95
E0.16 0 0.170 0.181 4.06 4.32 4.60
HE 0.205 0.214 0.220 5.21 5.44 5.60
L0.030 0.040 0.063 0.76 1.02 1.60
L1 0.51 REF 0.020 REF
Soldering Footprint
Ordering Information
Device Package Shipping
SZ1SMBxxAT3G SMB (Pb−Free) 2,500 / Tape & Reel
SZ1SMBxxCAT3G SMB (Pb−Free) 2,500 / Tape & Reel
H
E
E
D
b
LCA1
A
L1
2.743
0.108
2.159
0.085
2.261
0.089
Sacle 8:1 mm
Inches
( )
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 01/08/21
TVS Diodes
Surface Mount > 600W > SZ1SMB Series
Part Marking System Part Numbering System
SMB TVS
Type Code
A Uni Directional TVS
CA Bi Directional TVS
Zener Automotive
SZ 1SMB CA T3
Tape/Reel Designator
G
Pb Free Plating
xx
VR
VOLTAGE
Tape and Reel Specification
0.47
(12.0)
0.315
(8.0)
0.157
(4.0)
0.52
(13.3)
0.80 (20.2)
Arbor Hole Dia.
13.0 (330)
Dimensions are in inches
(and millimeters).
Direction of Feed
0.061 DIA
(1.55) Cover tape
Cathode mark for
uni-directional components
2
Anode
1
Cathode
LF XXXX
YMAWW
XXXX =Device Code (max four digits)
Y=Year
M=Month
A=Assembly Location
WW =Lot Code
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 http://www.littelfuse.com/disclaimer-electronics.
