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)

378A
SMB
5
100
95.00
105.00
90
12
800
1
0.5
76
379A
SMB
5
110
104.50
115.50
125
12
1000
1
0.5
83.6
380A
SMB
5
120
114.00
126.00
170
10
1150
1
0.5
91.2
381A
SMB
5
130
123.50
136.50
190
10
1250
1
0.5
98.8
382A
SMB
5
140
133.00
147.00
230
8
1500
1
0.5
106
383A
SMB
5
150
142.50
157.50
330
8
1500
1
0.5
114
384A
SMB
5
160
152.00
168.00
350
8
1650
1
0.5
122
385A
SMB
5
170
161.50
178.50
380
8
1750
1
0.5
129
386A
SMB
5
180
171.00
189.00
430
5
1750
1
0.5
137
387A
SMB
5
190
180.50
199.50
450
5
1850
1
0.5
144
388A
SMB
5
200
190.00
210.00
480
5
1850
1
0.5
152
333A
SMC
5
3.3
3.14
3.47
3
380
400
1
300
1
334A
SMC
5
3.6
3.42
3.78
2.5
350
500
1
150
1
335A
SMC
5
3.9
3.71
4.10
2
320
500
1
50
1
336A
SMC
5
4.3
4.09
4.52
2
290
500
1
10
1
Total 1435 < 1...919293...96 > proceed page OK

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