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)

1N5385A
DO-27
5
170
161.50
178.50
380
8
1750
1
0.5
129
1N5386A
DO-27
5
180
171.00
189.00
430
5
1750
1
0.5
137
1N5387A
DO-27
5
190
180.50
199.50
450
5
1850
1
0.5
144
1N5388A
DO-27
5
200
190.00
210.00
480
5
1850
1
0.5
152
333A
SMA
5
3.3
3.14
3.47
3
380
400
1
300
1
334A
SMA
5
3.6
3.42
3.78
2.5
350
500
1
150
1
335A
SMA
5
3.9
3.71
4.10
2
320
500
1
50
1
336A
SMA
5
4.3
4.09
4.52
2
290
500
1
10
1
337A
SMA
5
4.7
4.47
4.94
2
260
450
1
5
1
338A
SMA
5
5.1
4.85
5.36
1.5
240
400
1
1
1
339A
SMA
5
5.6
5.32
5.88
1
220
400
1
1
2
340A
SMA
5
6
5.70
6.30
1
200
300
1
1
3
341A
SMA
5
6.2
5.89
6.51
1
200
200
1
1
3
342A
SMA
5
6.8
6.46
7.14
1
175
200
1
10
5.2
343A
SMA
5
7.5
7.13
7.88
1.5
175
200
1
10
5.7
Total 1435 < 1...848586...96 > proceed page OK

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Address: No.196, East Qingyu Road‌, Rucheng Street, Rugao-226500, Jiangsu Province, China.

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