Zener Diodes

A ‌Zener Diode‌ is a specialized semiconductor device engineered to ‌maintain a stable reference voltage‌ in circuits by operating reliably in its ‌reverse breakdown region‌. Unlike standard diodes (which break down destructively under reverse bias), Zener diodes leverage controlled reverse breakdown for precise voltage regulation, surge protection, and signal clipping.

‌Core Working Principle‌:

1‌. Reverse Breakdown Mechanism‌:

Zener Effect‌: Dominates below ‌5.6V‌ – quantum tunneling of electrons across the PN junction.

Avalanche Effect‌: Dominates above ‌5.6V‌ – impact ionization creating electron "avalanches".
→ Both maintain near-constant voltage (VZ​) across the diode during reverse conduction.

2‌.Self-Recovery:

Unlike fuses or MOVs, Zener diodes revert to blocking mode when voltage drops below VZ​.

Part Number

Marking

Package

PD

W

Vz @ Izt 

Nom.
(V)

Min.
(V)

Max.
(V)

ZZT

Max.

(Ω)

 @ Izt

(mA)

ZZK

Max.

(Ω)

 @ Izk

(mA)

IR(μA)

Max.

 @VR
(V)

352A
SMC
5
15
14.25
15.75
2.5
75
75
1
1
11.5
353A
SMC
5
16
15.20
16.80
2.5
75
75
1
1
12.2
354A
SMC
5
17
16.15
17.85
2.5
70
75
1
0.5
12.9
355A
SMC
5
18
17.10
18.90
2.5
65
75
1
0.5
13.7
356A
SMC
5
19
18.05
19.95
3
65
75
1
0.5
14.4
357A
SMC
5
20
19.00
21.00
3
65
75
1
0.5
15.2
358A
SMC
5
22
20.90
23.10
3.5
50
75
1
0.5
16.7
359A
SMC
5
24
22.80
25.20
3.5
50
100
1
0.5
18.2
360A
SMC
5
25
23.75
26.25
4
50
110
1
0.5
19
361A
SMC
5
27
25.65
28.35
5
50
120
1
0.5
20.6
362A
SMC
5
28
26.60
29.40
6
50
130
1
0.5
21.2
363A
SMC
5
30
28.50
31.50
8
40
140
1
0.5
22.8
364A
SMC
5
33
31.35
34.65
10
40
150
1
0.5
25.1
365A
SMC
5
36
34.20
37.80
11
30
160
1
0.5
27.4
366A
SMC
5
39
37.05
40.95
14
30
170
1
0.5
29.7
Total 1435 < 1...93949596 > proceed page OK

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