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)

374A
SMA
5
75
71.25
78.75
45
20
620
1
0.5
56
375A
SMA
5
82
77.90
86.10
65
15
720
1
0.5
62.2
376A
SMA
5
87
82.65
91.35
75
15
760
1
0.5
66
377A
SMA
5
91
86.45
95.55
75
15
760
1
0.5
69.2
378A
SMA
5
100
95.00
105.00
90
12
800
1
0.5
76
379A
SMA
5
110
104.50
115.50
125
12
1000
1
0.5
83.6
380A
SMA
5
120
114.00
126.00
170
10
1150
1
0.5
91.2
381A
SMA
5
130
123.50
136.50
190
10
1250
1
0.5
98.8
382A
SMA
5
140
133.00
147.00
230
8
1500
1
0.5
106
383A
SMA
5
150
142.50
157.50
330
8
1500
1
0.5
114
384A
SMA
5
160
152.00
168.00
350
8
1650
1
0.5
122
385A
SMA
5
170
161.50
178.50
380
8
1750
1
0.5
129
386A
SMA
5
180
171.00
189.00
430
5
1750
1
0.5
137
387A
SMA
5
190
180.50
199.50
450
5
1850
1
0.5
144
388A
SMA
5
200
190.00
210.00
480
5
1850
1
0.5
152
Total 1435 < 1...878889...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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