1N4557B

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	3.9V
Tolerance:	±5%
Power - Max:	50W
Impedance (Max) (Zzt):	0.16 Ohms
Current - Reverse Leakage @ Vr:	150µA @ 500mV
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 10A
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	TO-204AD
Supplier Device Package:	TO-204AD (TO-3)
Base Part Number:	1N4557

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

1N4557B

Introduction

The 1N4557B is an advanced single Zener diode with high voltage and low forward voltage drop. This device has a Zener voltage of 4.1 volts and a maximum power dissipation of 500 mW at a maximum junction temperature of 157°C, enabling it to handle high voltage and power applications. This diode is manufactured using a thick-terminal configuration, which gives it excellent reverse standoff voltage of 400V. The 1N4557B is lead-free, making it environmentally friendly.

Application Fields

The 1N4557B diode is designed for a wide range of applications, including voltage regulation, current limiters, surge suppressors, and other high voltage and power applications. In voltage regulation, it is often used to provide a constant voltage by limiting the maximum voltage. In current limiters and surge suppressors, it is used to protect circuits from excessive current and voltage. The 1N4557B is also often used in automotive, industrial, and communication systems.

Working Principle

The 1N4557B works by restricting the forward current flow when the voltage exceeds the Zener voltage. This is done by creating a reverse depletion region between the p-type and n-type regions, which causes the diode to turn on and not allow any more current to pass. Once the voltage falls below the Zener voltage, the diode will turn off, allowing the current to flow. This protects the circuit from excessive or overvoltage.

Conclusion

The 1N4557B is an advanced single Zener diode which is used in a wide range of applications. Its high voltage and low forward voltage drop make it ideal for voltage regulation, current limiters, surge suppressors, and other high voltage and power applications. It also boasts a reverse standoff voltage of 400V with a maximum power dissipation of 500 mW at a maximum junction temperature of 157°C. The 1N4557B is lead-free, making it environmentally friendly.

The specific data is subject to PDF, and the above content is for reference

Part Number	Manufacturer	Price	Quantity	Description