TVS Diodes
Surface Mount > 400W > SZ1SMA Series
SZ1SMA Series
RoHS
Pb e3
Description
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.
Bi-directional
Uni-directional
Features
• Zener Transient
Overvoltage Suppressors
• Working Peak Reverse
Voltage Range −5V to
170V for uni-directional
and 10 V to 78 V for bidirectional
Agency Approvals
Agency
Agency File Number
E128662
Parameter
Peak Power Dissipation (Note 1) @ TL = 25°C,
Pulse Width = 1 ms
DC Power Dissipation @ TL = 75°C Measured
Zero Lead Length (Note 2)
Derate Above 75°C
Thermal Resistance from Junction−to−Lead
Symbol
Value
Unit
PPK
400
W
PD
1.5
20
50
W
mW/°C
°C/W
W
mW/°C
°C/W
RƟJL
PD
• Low Profile Package
• Standard Zener
Breakdown Voltage Range
−11.1 V to 95.83 V for bidirectional, 6.4 V to 209 V
for uni-directional
Maximum Ratings and Thermal Characteristics
DC Power Dissipation (Note 3) @ TA = 25°C
Derate Above 25°C
Thermal Resistance from Junction–to– Ambient
RƟJA
0.5
4.0
250
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
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 unidirectional)
• Package Design for Top
Slide or Bottom Circuit
Board Mounting
• 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
• 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
• Recognized to UL 497B
as an Isolated Loop Circuit
Protector
• RoHS-compliant and
halogin-free
Additional Information
Datasheet
Resources
Samples
Functional Diagram
Bi-directional
Cathode
Anode
Uni-directional
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
I-V Curve Characteristics (T
A
= 25°C unless otherwise noted) – For Bi-directional
Symbol
IPP
IPP
Maximum Reverse Peak Pulse Current
VC
Clamping Voltage @ IPP
VRWM
IR
IT
VC VBR VRWM IR
VBR
IR VRWM VBR VC
IT
Parameter
IT
Working Peak Reverse Voltage
Maximum Reverse Leakage Current @ VRWM
Breakdown Voltage @ IT
Test Current
IPP
For Bi-directional
I-V Curve Characteristics (T
A
= 25°C unless otherwise noted, VF = 3.5 V Max. @ IF = 30 A for all types) (Note 5) – For Uni-directional
Symbol
I
IPP
Maximum Reverse Peak Pulse Current
VC
Clamping Voltage @ IPP
VRWM
IR
V
Parameter
VBR
Working Peak Reverse Voltage
Maximum Reverse Leakage Current @ VRWM
Breakdown Voltage @ IT
IT
Test Current
IF
Forward Current
VF
Forward Voltage @ IF
5. 1/2 sine wave or equivalent, PW = 8.3 ms, non−repetitive duty cycle.
For Uni-directional
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Electrical Characteristics – For Uni-directional
Device
Device
Marking
Breakdown Voltage
VRWMNote 6
IR @
VRWM
Volts
µA
MIN
NOM
VBR @ IT (V)Note 7
VC @ IPPNote 8
C Typ.Note 9
@ IT
VC
IPP
MAX
mA
Volts
Amps
pF
Agency
Approval
SZ1SMA5.0AT3G
QE
5.0
400
6.40
6.70
7.00
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
1
13.6
29.4
1035
X
SZ1SMA8.5AT3G
QT
8.5
5.0
9.44
9.92
10.40
1
14.4
27.8
1265
X
SZ1SMA9.0AT3G
QV
9.0
2.5
10.00
10.55
11.10
1
15.4
26.0
1200
X
SZ1SMA10AT3G
QX
10
2.5
11.10
11.70
12.30
1
17.0
23.5
1090
X
SZ1SMA11AT3G
QZ
11
2.5
12.20
12.85
13.50
1
18.2
22.0
1000
X
SZ1SMA12AT3G
RE
12
2.5
13.30
14.00
14.70
1
19.9
20.1
925
X
SZ1SMA13AT3G
RG
13
2.5
14.40
15.15
15.90
1
21.5
18.6
860
X
SZ1SMA14AT3G
RH
14
2.5
15.60
16.40
17.20
1
23.2
17.2
800
X
SZ1SMA15AT3G
RM
15
2.5
16.70
17.60
18.50
1
24.4
16.4
758
X
SZ1SMA16AT3G
RP
16
2.5
17.80
18.75
19.70
1
26.0
15.4
715
X
SZ1SMA17AT3G
RR
17
2.5
18.90
19.90
20.90
1
27.6
14.5
680
X
SZ1SMA18AT3G
RT
18
2.5
20.00
21.05
22.10
1
29.2
13.7
645
X
SZ1SMA20AT3G
RV
20
2.5
22.20
23.35
24.50
1
32.4
12.3
585
X
SZ1SMA22AT3G
RX
22
2.5
24.40
25.65
26.90
1
35.5
11.3
540
X
SZ1SMA24AT3G
RZ
24
2.5
26.70
28.10
29.50
1
38.9
10.3
500
X
SZ1SMA26AT3G
SE
26
2.5
28.90
30.40
31.90
1
42.1
9.5
460
X
SZ1SMA28AT3G
SG
28
2.5
31.10
32.75
34.40
1
45.4
8.8
430
X
SZ1SMA30AT3G
SK
30
1.0
33.30
35.05
36.80
1
48.4
8.3
405
X
SZ1SMA33AT3G
SM
33
2.5
36.70
38.65
40.60
1
53.3
7.5
375
X
SZ1SMA36AT3G
SP
36
2.5
40.00
42.10
44.20
1
58.1
6.9
345
X
SZ1SMA40AT3G
SR
40
2.5
44.40
46.75
49.10
1
64.5
6.2
315
X
SZ1SMA43AT3G
ST
43
2.5
47.80
50.30
52.80
1
69.4
5.8
295
X
SZ1SMA45AT3G
SV
45
2.5
50.00
52.65
55.30
1
72.2
5.5
280
X
SZ1SMA48AT3G
SX
48
2.5
53.30
56.10
58.90
1
77.4
5.2
265
X
SZ1SMA51AT3G
SZ
51
2.5
56.70
59.70
62.70
1
82.4
4.9
252
-
SZ1SMA54AT3G
TE
54
2.5
60.00
63.15
66.30
1
87.1
4.6
240
X
SZ1SMA58AT3G
TG
58
2.5
64.40
67.80
71.50
1
93.6
4.3
225
X
SZ1SMA60AT3G
TK
60
2.5
66.70
70.20
73.72
1
96.8
4.1
219
-
SZ1SMA70AT3G
TP
70
2.5
77.80
81.90
86.00
1
113.0
3.5
190
X
SZ1SMA75AT3G
TR
75
2,5
83.3
87.7
92.1
1
121.0
3.3
180
-
SZ1SMA78AT3G
TT
78
2,5
86.7
91.25
95.8
1
126.0
3.2
178
-
SZ1SMA85AT3G
TV
85
2,5
94.4
99.2
104
1
137.0
2.9
173
-
SZ1SMA90AT3G
TX
90
2,5
100
105.5
111
1
146.0
2.8
169
-
SZ1SMA100AT3G
TZ
100
2,5
111
117
123
1
162,0
2.5
162
-
SZ1SMA110AT3G
VE
110
2,5
122
128.5
135
1
177.0
2.3
155
-
SZ1SMA120AT3G
VG
120
2,5
133
140
147
1
193.0
2.1
148
-
SZ1SMA130AT3G
VK
130
2,5
144
151.5
159
1
209.0
1.9
142
-
SZ1SMA150AT3G
VM
150
2,5
167
176
185
1
243.0
1.7
127
-
SZ1SMA160AT3G
VP
160
2,5
178
187.5
197
1
259.0
1.6
119
-
SZ1SMA170AT3G
VR
170
2,5
189
199
209
1
275.0
1.5
112
-
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Electrical Characteristics - For Bi-directional
Device
Device
Marking
VRWMNote 6
IR @
VRWM
Volts
µA
Breakdown Voltage
VBR @ IT (V)Note 7
MIN
VC @ IPPNote 8
@ IT
VC
IPP
Volts
Amps
NOM
MAX
mA
Agency
Approval
SZ1SMA10CAT3G
QXC
10
2.5
11.10
11.69
12.27
1
17.0
23.5
X
SZ1SMA12CAT3G
REC
12
2.5
13.30
14.00
14.70
1
19.9
20.1
X
SZ1SMA13CAT3G
RGC
13
2.5
14.40
15.16
15.92
1
21.5
18.6
X
SZ1SMA15CAT3G
RMC
15
2.5
16.70
17.58
18.46
1
24.4
16.4
X
SZ1SMA16CAT3G
RPC
16
2.5
17.80
18.74
19.67
1
26.0
15.4
X
SZ1SMA18CAT3G
RTC
18
2.5
20.00
21.06
22.11
1
29.2
13.7
X
SZ1SMA20CAT3G
RVC
20
2.5
22.20
23.37
24.54
1
32.4
12.3
X
SZ1SMA22CAT3G
RXC
22
2.5
24.4
25.65
26.90
1
35.5
11.3
-
SZ1SMA24CAT3G
RZC
24
2.5
26.70
28.11
29.51
1
38.9
10.3
X
SZ1SMA26CAT3G
SEC
26
2.5
28.90
30.42
31.94
1
42.1
9.5
X
SZ1SMA28CAT3G
SGC
28
2.5
31.10
32.74
34.37
1
45.4
8.8
X
SZ1SMA30CAT3G
SKC
30
2.5
33.30
35.06
36.81
1
48.4
8.3
X
SZ1SMA33CAT3G
SMC
33
2.5
36.70
38.63
40.56
1
53.3
7.5
X
SZ1SMA36CAT3G
SPC
36
2.5
40.00
42.11
44.21
1
58.1
6.9
X
SZ1SMA40CAT3G
SRC
40
2.5
44.40
46.74
49.07
1
64.5
6.2
X
SZ1SMA43CAT3G
STC
43
2.5
47.80
50.30
52.80
1
69.4
5.8
-
SZ1SMA45CAT3G
SVC
45
2.5
50.00
52.65
55.30
1
72.2
5.5
-
SZ1SMA48CAT3G
SXC
48
2.5
53.30
56.11
58.91
1
77.4
5.2
X
SZ1SMA58CAT3G
TGC
58
2.5
64.40
67.79
71.18
1
93.6
4.3
X
SZ1SMA60CAT3G
TKC
60
2.5
66.70
70.21
73.72
1
96.8
4.1
X
SZ1SMA70CAT3G
TPC
70
2.5
77.80
81.90
85.99
1
113.0
3.5
X
SZ1SMA78CAT3G
TTC
78
2.5
86.70
91.27
95.83
1
126.0
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. 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 = 1.0 MHz, TJ = 25°C.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Ratings and Characteristic Curves
Figure 1. Pulse Rating Curve
Figure 2. Pulse Waveform
120
100000
IPPM, Peak Pulse Current (%)
10000
Ppk, Peak Power (W)
= 10µs
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2.
TA=25˚C
1000
100
10
0.0001
0.001
0.01
0.1
1
100
Peak Value
IPPM
80
60
Half Value - IPP/2
40
10/1000 µs Waveform
as defined by R.E.A.
20
td
0
10
0
1
tp,Pulse Width (ms)
2
3
4
5
t, Time (ms)
Figure 3 - Surge Derating Curve
Figure 4. Typical Junction Capacitance vs. Bias Voltage
1,000
120
SZ1SMA10CAT3G
10*1000 WAVEFORM
100
SZ1SMA18CAT3G
80
C, CAPACITANCE (pF)
Peak Pulse Derating In %
Of Peak Current
TA= 25°C
PW (ID) is defined as the
point where the peak current
decays to 50% of IPP
SZ1SMA170AT3G
60
40
20
100
SZ1SMA48CAT3G
SZ1SMA78CAT3G
10
TJ= 25°C
0
0
40
80
120
F = 1 MHz
160
T A AMBIENT TEMPERATURE(˚C)
1
1
10
100
BIAS VOLTAGE (VOLTS)
10000
Tj= 25˚C
F=1MHz
Capacitance(pF)
1000
SZ1SMA70AT3G
SZ1SMA85AT3G
100
SZ1SMA170AT3G
10
1
1
10
BIAS VOLTAGE(VOLTS)
100
Figure 6. Steady State Power Derating
PD, MAXIMUM POWER DISSI PATION (WATTS)
Figure 5. Typical Junction Capacitance vs. Bias Voltage
6
5
4
@ TL = 75°C
PD = 1.5 W
3
2
@ TA = 25°C
PD = 0.5 W
1
0
0
25
50
100
75
T, TEMPERATURE (°C)
125
150
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Soldering Parameters
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
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
+0/-5
Critical Zone
TL to TP
tL
Ts(max)
Ramp-down
Ts(min)
ts
Preheat
25˚C
t 25˚C to Peak
Time (t)
Environmental Specifications
Polarity
0.00246 ounce, 0.0767 grams
JEDEC DO214AC. Void-Free, Transfer-Molded, Thermosetting
Plastic Epoxy Meets UL 94V-0
Color band denotes cathode for unidirectional components.
Terminal
Matte Tin-plated leads, Solderable per JESD22-B102
Case
Ramp-up
TL
°C
Physical Specifications
Weight
tp
TP
Temperature (T)
Reflow Condition
Soldering Footprint
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
HE
4.000
0.157
E
bD D
2.000
0.079
The cathode indicator is for uni- devices only
2.000
0.079
A
SCALE 8:1
mm
inches
A1
c
L
Ordering Information
Device**
Package
Shipping
Dim
SZ1SMAxxAT3G
SMA
(Pb−Free)
5,000 /
Tape & Reel
SZ1SMAxxCAT3G
SMA
(Pb−Free)
5,000 /
Tape & Reel
**The “T3” suffix refers to a 13 inch reel
Inches
Millimeters
Min
Nom
Max
Min
Nom
Max
A
0.078
0.083
0.087
1.97
2.10
2.20
A1
0.002
0.004
0.008
0.05
0.10
0.20
b
0.050
0.057
0.064
1.27
1.45
1.63
c
0.006
0.011
0.016
0.15
0.28
0.41
D
0.090
0.103
0.115
2.29
2.60
2.92
E
0.160
0.170
0.180
4.06
4.32
4.57
HE
0.190
0.205
0.220
4.83
5.21
5.59
L
0.030
0.045
0.060
0.76
1.14
1.52
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20
TVS Diodes
Surface Mount > 400W > SZ1SMA Series
Part Marking System
1
Cathode
Part Numbering System
XXXX
YMAWW
SZ
2
Anode
1SMA
xx CA T3 G
Pb Free Plating
Tape/Reel Designator
XXXX =Device Code (max four digits)
Y
=Year
M
=Month
A
=Assembly Location
WW =Lot Code
Type Code
CA Bi-Directional TVS
A Uni Directional TVS
SMA TVS
VR VOLTAGE
Zener Automotive
Tape and Reel Specification
0.157
(4.0)
Cathode mark for
uni-directional components
0.47
(12.0)
0.315
(8.0)
0.061 DIA
(1.55)
Cover tape
13.0 (330)
0.80 (20.2)
Arbor Hole Dia.
0.52
(13.3)
Dimensions are in inches
(and millimeters).
Direction of Feed
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.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 12/18/20