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)

367A
SMC
5
43
40.85
45.15
20
30
190
1
0.5
32.7
368A
SMC
5
47
44.65
49.35
25
25
210
1
0.5
35.8
369A
SMC
5
51
48.45
53.55
27
25
230
1
0.5
38.8
370A
SMC
5
56
53.20
58.80
35
20
280
1
0.5
42.6
371A
SMC
5
60
57.00
63.00
40
20
350
1
0.5
42.5
372A
SMC
5
62
58.90
65.10
42
20
400
1
0.5
47.1
373A
SMC
5
68
64.60
71.40
44
20
500
1
0.5
51.7
374A
SMC
5
75
71.25
78.75
45
20
620
1
0.5
56
375A
SMC
5
82
77.90
86.10
65
15
720
1
0.5
62.2
376A
SMC
5
87
82.65
91.35
75
15
760
1
0.5
66
377A
SMC
5
91
86.45
95.55
75
15
760
1
0.5
69.2
378A
SMC
5
100
95.00
105.00
90
12
800
1
0.5
76
379A
SMC
5
110
104.50
115.50
125
12
1000
1
0.5
83.6
380A
SMC
5
120
114.00
126.00
170
10
1150
1
0.5
91.2
381A
SMC
5
130
123.50
136.50
190
10
1250
1
0.5
98.8
Total 1435 < 1...93949596 > proceed page OK

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