1N5373B

Overview

The onsemi 1N5373B is a 5-watt Zener voltage regulator diode designed for robust power handling in axial lead applications. It features a nominal Zener voltage of 68 V with a tight tolerance of ±5%. The device utilizes silicon-oxide passivated junctions to ensure superior operating characteristics and environmental protection within a transfer-molded plastic package. Key electrical parameters include a maximum dynamic impedance of 40 Ohms and a reverse leakage current of 500 nA at 51.7 V. It supports a wide operating temperature range from -65°C to +200°C, making it suitable for demanding industrial environments.

Feature Summary

• Utilizes silicon-oxide passivated junction technology for enhanced reliability and stable performance under stress.
• Provides high surge rating capability up to 180 W for brief transient events lasting 8.3 ms.
• Features an ESD rating of Class 3 exceeding 16 kV per the Human Body Model for improved robustness.
• Encased in a void-free, thermosetting plastic package that offers corrosion resistance and solderability.

Applications

• Voltage regulation in industrial power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in measurement instrumentation

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N5373B part number is utilized by multiple semiconductor producers including Diotec Semiconductor and Microsemi. Confirm that the component meets the required JEDEC registration standards and RoHS compliance specifications relevant to your manufacturing region. Ensure the axial lead configuration matches your PCB layout requirements before finalizing procurement orders.

Selection Notes

Select this component for designs requiring a precise 68 V reference point with significant power dissipation capabilities. The 5 W rating allows for operation at higher DC currents provided adequate heat sinking is implemented. Consider the ±5% tolerance for applications needing tighter voltage stability, and verify that the 40 Ohm dynamic impedance aligns with the noise and regulation requirements of the target circuit topology.

Part Context

This device belongs to the 1N53xxB series of 5 Watt Zener diodes, which offers a broad selection of voltages ranging from 3.3 V to 200 V. The series is characterized by tight parameter limits and consistent performance across different manufacturers. It serves as a standard solution for general-purpose voltage regulation where through-hole mounting and high thermal resilience are prioritized over miniaturization.

Replacement Considerations

The 1N5373BG is a verified equivalent variant offered by onsemi, featuring identical electrical specifications and mechanical dimensions. Cross-referencing with other manufacturers requires strict verification of the 68 V nominal voltage, 5 W power rating, and DO-201AA package compatibility to ensure functional interchangeability without circuit modification.