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)

382A
SMC
5
140
133.00
147.00
230
8
1500
1
0.5
106
383A
SMC
5
150
142.50
157.50
330
8
1500
1
0.5
114
384A
SMC
5
160
152.00
168.00
350
8
1650
1
0.5
122
385A
SMC
5
170
161.50
178.50
380
8
1750
1
0.5
129
386A
SMC
5
180
171.00
189.00
430
5
1750
1
0.5
137
387A
SMC
5
190
180.50
199.50
450
5
1850
1
0.5
144
388A
SMC
5
200
190.00
210.00
480
5
1850
1
0.5
152
Total 1435 < 1...93949596 > proceed page OK

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