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)

333A
SMB
5
3.3
3.14
3.47
3
380
400
1
300
1
334A
SMB
5
3.6
3.42
3.78
2.5
350
500
1
150
1
335A
SMB
5
3.9
3.71
4.10
2
320
500
1
50
1
336A
SMB
5
4.3
4.09
4.52
2
290
500
1
10
1
337A
SMB
5
4.7
4.47
4.94
2
260
450
1
5
1
338A
SMB
5
5.1
4.85
5.36
1.5
240
400
1
1
1
339A
SMB
5
5.6
5.32
5.88
1
220
400
1
1
2
340A
SMB
5
6
5.70
6.30
1
200
300
1
1
3
341A
SMB
5
6.2
5.89
6.51
1
200
200
1
1
3
342A
SMB
5
6.8
6.46
7.14
1
175
200
1
10
5.2
343A
SMB
5
7.5
7.13
7.88
1.5
175
200
1
10
5.7
344A
SMB
5
8.2
7.79
8.61
1.5
150
200
1
10
6.2
345A
SMB
5
8.7
8.27
9.14
2
150
200
1
10
6.6
346A
SMB
5
9.1
8.65
9.56
2
150
150
1
7.5
6.9
347A
SMB
5
10
9.50
10.50
2
125
125
1
5
7.6
Total 1435 < 1...888990...96 > proceed page OK

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