TZM5262F-GS18 vs ZMM5238B-13

Part Number	TZM5262F-GS18	ZMM5238B-13
Category	Diodes - Zener - Single	Diodes - Zener - Single
Manufacturer	Vishay Semiconductor - Diodes Division	Vishay Semiconductor - Diodes Division
Description	DIODE ZENER 51V 500MW SOD80	DIODE ZENER 8.7V 500MW DO213AA
Package	Tape & Reel (TR)	Tape & Reel (TR)
Series	Automotive, AEC-Q101	-
Operating Temperature	175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AA (Glass)
Supplier Device Package	SOD-80 MiniMELF	DO-213AA (GL34)
Tolerance	-	±5%
Power - Max	500 mW	500 mW
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA
Current - Reverse Leakage @ Vr	100 nA @ 39 V	3 µA @ 6.5 V
Voltage - Zener (Nom) (Vz)	51 V	8.7 V
Impedance (Max) (Zzt)	1.1 kOhms	8 Ohms

1. What are the two types of Zener diodes?

Zener diodes are mainly divided into two types: one that works based on the avalanche effect (usually in high voltage applications) and the other that works based on the Zener breakdown mechanism (suitable for lower voltages).
2. What is the difference between a diode and a Zener diode?

While a normal diode is mainly used for unidirectional current flow, a Zener diode is designed to provide a stable voltage reference point when reverse biased. A normal diode conducts when forward biased and does not conduct or has only a small leakage current when reverse biased; a Zener diode can start conducting after reaching a specific reverse voltage (called the Zener voltage).
3. What happens if a Zener diode is connected in reverse?

When a Zener diode is properly connected in reverse and a sufficient reverse voltage is applied to exceed its Zener voltage, it will begin to conduct and remain at a relatively constant voltage level.
4. What happens when a Zener diode fails?

If it is overheated or subjected to excessive current, it may cause permanent damage, which will appear as an open or short circuit state.