Surface Mount Transient Voltage Suppressors
Part Number
Uni
Stand-Off
Voltage VRMW
(V)
SM4Z15A
SM4Z16A
SM4Z18A
SM4Z20A
SM4Z22A
SM4Z24A
SM4Z26A
SM4Z28A
SM4Z30A
SM4Z33A
SM4Z36A
SM4Z40A
SM4Z43A
Note:(1)Surge waveform: 10/1000μs
15.0
16.0
18.0
20.0
22.0
24.0
26.0
28.0
30.0
33.0
36.0
40.0
43.0
Breakdown
Voltage
VBR
min(V)
max(V)
16.70
17.80
20.00
22.20
24.40
26.70
28.90
31.10
33.30
36.70
40.00
44.40
47.80
18.50
20.5
22.10
24.50
26.90
29.50
31.90
34.40
36.80
40.60
44.20
49.10
52.80
Test
Current
IT
(mA)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
Maximum
Reverse
Leakage I R
@V RWM
(uA)
10
10
10
10
10
10
10
10
10
10
10
10
10
Maximum
Reverse
Surge
Current I PP(1)
(A)
188
176
157
141
129
118
109
100
95
86
79
71
66
Maximum
Clamping
Voltage
V C @I PP (V)
24.4
26.0
29.2
32.4
35.5
38.9
42.1
45.4
48.4
53.3
58.1
64.5
69.4
Revision April 24, 2018
PPPM Peak Pulse Power Dissipation - Max power dissipation
VRWM Reverse Stand-off Voltage - Maximum voltage that can
be applied to TVS without operation
VBR Breakdown Voltage – Maximum voltage that flows
though the TVS at a specified current (IT)
VC Clamping Voltage – Peak voltage measured across the
TVS at a specified IPPM (peak impulse current)
IR Reverse Leakage Current – Current measured at VR
VF Forward Voltage Drop for Uni-directional
2/4
@ UN Semiconductor Co., Ltd. 2018
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.