1N5370B

Overview

The Microsemi Corporation 1N5370B is a silicon unidirectional Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 56 V with a standard tolerance of ±5%. The device supports a maximum power dissipation of 5 W and operates within a temperature range of -65 °C to +200 °C. Key electrical characteristics include a maximum dynamic impedance of 35 Ω, a test current of 20 mA, and a maximum reverse leakage current of 500 nA. The component utilizes an axial leaded T-18 plastic package.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features low thermal resistance design suitable for high DC currents with adequate heat sinking
• Utilizes plastic encapsulation with Level 1 moisture classification requiring no dry pack

Applications

• Voltage regulation circuits for microcontrollers and sensors
• Overvoltage protection and transient suppression in industrial equipment
• High-reliability military and aerospace screening applications

Procurement Notes

Verify the specific manufacturer source when procuring this part number, as it is produced by multiple vendors including Central Semiconductor, STMicroelectronics, and onsemi under the same JEDEC designation. Confirm RoHS compliance status and suffix requirements, as these vary significantly between manufacturers. Ensure the selected variant matches the required operating temperature range and packaging specifications for your specific application environment.

Selection Notes

Select this component based on its 56 V nominal breakdown voltage and 5 W power handling capability. Consider the ±5% tolerance requirement and the maximum dynamic impedance of 35 Ω for precision regulation needs. Evaluate the thermal management requirements given the 5 W dissipation rating and the wide operating temperature range extending up to 200 °C depending on the specific manufacturer's datasheet.

Part Context

The 1N5370B belongs to the JEDEC registered 1N5333 through 1N5388B series of 5.0 watt Zener diodes. This series covers a voltage selection from 3.3 to 200 volts. The 'B' suffix typically denotes a standard voltage tolerance of plus or minus 5%. The series is characterized by plastic encapsulation and axial leads, offering a robust solution for general-purpose voltage regulation tasks.

Replacement Considerations

Direct substitutes include the 1N5370BE3 (RoHS compliant version) and the 1N5370A (10% tolerance variant). Cross-manufacturer equivalents are available from Central Semiconductor, STMicroelectronics, and onsemi. Verify that any replacement maintains the 56 V Zener voltage, 5 W power rating, and compatible package dimensions.