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)

1N4743A
DO-41G
1
13
12.35
13.65
10
19
700
0.25
5
9.9
1N4744A
DO-41G
1
15
14.25
15.75
14
17
700
0.25
5
11.4
1N4745A
DO-41G
1
16
15.20
16.80
16
15.5
700
0.25
5
12.2
1N4746A
DO-41G
1
18
17.10
18.90
20
14
750
0.25
5
13.7
1N4747A
DO-41G
1
20
19.00
21.00
22
12.5
750
0.25
5
15.2
1N4748A
DO-41G
1
22
20.90
23.10
23
11.5
750
0.25
5
16.7
1N4749A
DO-41G
1
24
22.80
25.20
25
10.5
750
0.25
5
18.2
1N4750A
DO-41G
1
27
25.65
28.35
35
9.5
750
0.25
5
20.6
1N4751A
DO-41G
1
30
28.50
31.50
40
8.5
1000
0.25
5
22.8
1N4752A
DO-41G
1
33
31.35
34.65
45
7.5
1000
0.25
5
25.1
1N4753A
DO-41G
1
36
34.20
37.80
50
7
1000
0.25
5
27.4
1N4754A
DO-41G
1
39
37.05
40.95
60
6.5
1000
0.25
5
29.7
1N4755A
DO-41G
1
43
40.85
45.15
70
6
1500
0.25
5
32.7
1N4756A
DO-41G
1
47
44.65
49.35
80
5.5
1500
0.25
5
35.8
1N4757A
DO-41G
1
51
48.45
53.55
95
5
1500
0.25
5
38.8
Total 1435 < 1...161718...96 > proceed page OK

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