© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
•Zener Transient
Overvoltage Suppressors
• Working Peak Reverse
Voltage Range −5V to 70V
for uni-directional and 10 V
to 78 V for bi-directional
• Standard Zener
Breakdown Voltage Range
−11.1 V to 95.83 V for bi-
directional, 6.4 V to 86.0 V
for uni-directional
• 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
• 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 SZ1SMA 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 SZ1SMA 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 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
RƟJL
1.5
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
RƟJA
0.5
4.0
250
W
mW/°C
°C/W
Forward Surge Current (Note 4) @ TA = 25°C
(for uni-directional) IFSM 40 A
Operating and Storage Temperature Range TJ
Tstg
-65 to
+150 °C
Maximum Ratings and Thermal Characteristics
SZ1SMA Series
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
4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per
minute maximum. (for uni-directional)
Additional Information
Samples
Resources
Datasheet
Bi-directional
Uni-directional
Agency Approvals
Agency Agency File Number
E128662
RoHS
Pb
e3
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA 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
I-V Curve Characteristics (TA = 25°C unless otherwise noted) – For Bi-directional
I
PP
I
PP
I
R
I
T
I
T
I
R
V
RWM
V
C
V
BR
V
RWM
V
C
V
BR
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
IFForward Current
VFForward Voltage @ IF
I-V Curve Characteristics (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF = 30 A for all types) (Note 5) – For Uni-directional
5. 1/2 sine wave or equivalent, PW = 8.3 ms, non−repetitive duty cycle.
For Uni-directional
For Bi-directional
Functional Diagram
Bi-directional
Uni-directional
Cathode Anode
V
I
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Electrical Characteristics – For Uni-directional
Device Device
Marking
VRWM
(Note 10)
IR @
VRWM
Breakdown Voltage VC @ IPP(Note 8) C Typ.
(Note 9)
Agency
Approval
VBR @ IT (V) (Note 7) @ ITVCIPP
Volts µA MIN NOM MAX mA Volts Amps pF
SZ1SMA5.0AT3G QE 5.0 400 6.40 6.70 7. 0 0 10 9.2 43.5 2035 X
SZ1SMA6.0AT3G QG 6.0 400 6.67 7.02 7.37 10 10.3 38.8 1730 X
SZ1SMA6.5AT3G QK 6.5 250 7.22 7.60 7.98 10 11. 2 35.7 1605 X
SZ1SMA8.0AT3G QR 8.0 25 8.89 9.36 9.83 113.6 29.4 1035 X
SZ1SMA8.5AT3G QT 8.5 5.0 9.44 9.92 10.40 114.4 27.8 1265 X
SZ1SMA9.0AT3G QV 9.0 2.5 10.00 10.55 11.10 115.4 26.0 1200 X
SZ1SMA10AT3G QX 10 2.5 11. 10 11.70 12.30 11 7. 0 23.5 1090 X
SZ1SMA11AT3G QZ 11 2.5 12.20 12.85 13.50 118.2 22.0 1000 X
SZ1SMA12AT3G RE 12 2.5 13.30 14.00 14.70 119.9 20.1 925 X
SZ1SMA13AT3G RG 13 2.5 14.40 15.15 15.90 121.5 18.6 860 X
SZ1SMA14AT3G RH 14 2.5 15.60 16.40 17.20 123.2 1 7. 2 800 X
SZ1SMA15AT3G RM 15 2.5 16.70 17.60 18.50 124.4 16.4 758 X
SZ1SMA16AT3G RP 16 2.5 17.80 18.75 19.70 126.0 15.4 715 X
SZ1SMA17AT3G RR 17 2.5 18.90 19.90 20.90 127.6 14.5 680 X
SZ1SMA18AT3G RT 18 2.5 20.00 21.05 22.10 129.2 13.7 645 X
SZ1SMA20AT3G RV 20 2.5 22.20 23.35 24.50 132.4 12.3 585 X
SZ1SMA22AT3G RX 22 2.5 24.40 25.65 26.90 135.5 11.3 540 X
SZ1SMA24AT3G RZ 24 2.5 26.70 28.10 29.50 138.9 10.3 500 X
SZ1SMA26AT3G SE 26 2.5 28.90 30.40 31.90 142.1 9.5 460 X
SZ1SMA28AT3G SG 28 2.5 31.10 32.75 34.40 145.4 8.8 430 X
SZ1SMA30AT3G SK 30 1. 0 33.30 35.05 36.80 148.4 8.3 405 X
SZ1SMA33AT3G SM 33 2.5 36.70 38.65 40.60 153.3 7. 5 375 X
SZ1SMA36AT3G SP 36 2.5 40.00 42.10 44.20 158.1 6.9 345 X
SZ1SMA40AT3G SR 40 2.5 44.40 46.75 49.10 164.5 6.2 315 X
SZ1SMA43AT3G ST 43 2.5 47.80 50.30 52.80 169.4 5.8 295 X
SZ1SMA45AT3G SV 45 2.5 50.00 52.65 55.30 172.2 5.5 280 X
SZ1SMA48AT3G SX 48 2.5 53.30 56.10 58.90 177.4 5.2 265 X
SZ1SMA54AT3G TE 54 2.5 60.00 63.15 66.30 187.1 4.6 240 X
SZ1SMA58AT3G TG 58 2.5 64.40 67.80 71.50 193.6 4.3 225 X
SZ1SMA70AT3G TP 70 2.5 77.80 81.90 86.00 1113.0 3.5 190 X
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Electrical Characteristics - For Bi-directional
Device Device
Marking
VRWM
(Note 6)
IR @
VRWM
Breakdown Voltage VC @ IPP(Note 8)
Agency
Approval
VBR @ IT (V) (Note 7) @ ITVCIPP
Volts µA MIN NOM MAX mA Volts Amps
SZ1SMA10CAT3G QXC 10 2.5 11. 10 11.69 12.27 11 7. 0 23.5 X
SZ1SMA12CAT3G REC 12 2.5 13.30 14.00 14.70 119.9 20.1 X
SZ1SMA13CAT3G RGC 13 2.5 14.40 15.16 15.92 121.5 18.6 X
SZ1SMA15CAT3G RMC 15 2.5 16.70 17.58 18.46 124.4 16.4 X
SZ1SMA16CAT3G RPC 16 2.5 17.80 18.74 19.67 126.0 15.4 X
SZ1SMA18CAT3G RTC 18 2.5 20.00 21.06 22.11 129.2 13.7 X
SZ1SMA20CAT3G RVC 20 2.5 22.20 23.37 24.54 132.4 12.3 X
SZ1SMA24CAT3G RZC 24 2.5 26.70 28.11 29.51 138.9 10.3 X
SZ1SMA26CAT3G SEC 26 2.5 28.90 30.42 31.94 142.1 9.5 X
SZ1SMA28CAT3G SGC 28 2.5 31.10 32.74 34.37 145.4 8.8 X
SZ1SMA30CAT3G SKC 30 2.5 33.30 35.06 36.81 148.4 8.3 X
SZ1SMA33CAT3G SMC 33 2.5 36.70 38.63 40.56 153.3 7. 5 X
SZ1SMA36CAT3G SPC 36 2.5 40.00 42.11 44.21 158.1 6.9 X
SZ1SMA40CAT3G SRC 40 2.5 44.40 46.74 49.07 164.5 6.2 X
SZ1SMA43CAT3G SSC 43 2.5 47.93 50.30 52.70 169.0 5.8
SZ1SMA45CAT3G STC 45 2.5 50.02 52.73 55.43 171.5 5.6
SZ1SMA48CAT3G SXC 48 2.5 53.30 56.11 58.91 177.4 5.2 X
SZ1SMA58CAT3G TGC 58 2.5 64.40 67.79 71.18 193.6 4.3 X
SZ1SMA60CAT3G TKC 60 2.5 66.70 70.21 73.72 196.8 4.1 X
SZ1SMA70CAT3G TPC 70 2.5 77.80 81.90 85.99 1113.0 3.5 X
SZ1SMA78CAT3G TTC 78 2.5 86.70 91.27 95.83 1126.0 3.2 X
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.
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Figure 1. Pulse Rating Curve
Ratings and Characteristic Curves
Figure 2. Pulse Waveform
Figure 3 - Surge Derating Curve Figure 4. Typical Junction Capacitance vs. Bias Voltage
10
100
1000
10000
100000
0.0001 0.001 0.01 0.1 1 10
Ppk, Peak Power (W)
tp,Pulse Width (ms)
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2.
TA=25˚C
0
20
40
60
80
100
120
0 40 80 120 160 200
Peak Pulse Derating in
of Peak Current (%)
TA Ambient Temperature (˚C)
10/1000 WAVEFORM
TA= 25°C
PW (ID) is defined as the
point where the peak current
decays to 50% of IPP
= 10µs
Peak Value
IPPM
Half Value - IPP/2
10/1000 µs Waveform
as defined by R.E.A.
td
012345
120
100
80
60
40
20
0
t, Time (ms)
IPPM, Peak Pulse Current (%)
1,000
100
1
BIAS VOLTAGE (VOLTS)
F = 1 MHz
C, CAPACITANCE (pF)
10
SZ1SMA10CAT3G
SZ1SMA18CAT3G
SZ1SMA48CAT3G
SZ1SMA78CAT3G
1 10 100
Figure 5. Typical Junction Capacitance vs. Bias Voltage Figure 6. Steady State Power Derating
BIAS VOLTAGE (VOLTS)
TJ
= 25°C
F = 1 MHz
C, CAPACITA NCE (pF)
10,000
1,000
100
10
1
1 10 100 0
6
T, TEMPERA TURE (°C)
50 100 150
PD, MAXIMUM POWER DISSI PATION (WATTS)
5
4
3
2
0
1
@ TL = 75°C
PD = 1.5 W
@ TA = 25°C
PD = 0.5 W
25 75 125
TJ= 25°C
SZ1SMA10AT3G
SZ1SMA5.0AT3G
SZ1SMA36AT3G
SZ1SMA64AT3G
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Physical Specifications
Weight 0.00246 ounce, 0.0767 grams
Case JEDEC DO214AC. 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
Soldering Footprint
Ordering Information
Device** Package Shipping
SZ1SMAxxAT3G SMA
(Pb−Free) 5,000 /
Tape & Reel
SZ1SMAxxCAT3G SMA
(Pb−Free) 5,000 /
Tape & Reel
4.000
0.157
2.000
0.079
2.000
0.079
mm
inches
SCALE 8:1
**The “T3” suffix refers to a 13 inch reel
Dimensions
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 0.180 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
HE
D
The cathode indicator is for uni- devices only
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/18/19
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
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.
Part Marking System
2
Anode
1
Cathode YMAWW
XXXX =Device Code
Y=Year
M=Month
A=Assembly Location
WW =Lot Code SMA TVS
Type Code
CA Bi-Directional TVS
A Uni Directional TVS
Zener Automotive
SZ 1SMA CA T3
Tape/Reel Designator
G
Pb Free Plating
xx
VR
VOLTAGE
Part Numbering System
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
LFXXXX
