1N5370B

Overview

The onsemi 1N5370B is a silicon-oxide passivated junction Zener voltage regulator diode belonging to the 1N53 Series. It provides a nominal reverse Zener voltage of 56 V with a tolerance of ±5%. The device features a maximum steady-state power dissipation of 5 W at a lead temperature of 25°C and operates within a junction-to-lead thermal resistance of 25 °C/W. Electrical characteristics include a test current (IZT) of 20 mA, a maximum Zener impedance (ZZT) of 35 Ohms, and a maximum reverse leakage current (IR) of 1.0 µA at the breakdown voltage. The component supports a maximum DC Zener current (IZM) of 86 mA and withstands a non-repetitive surge current of up to 180 W for an 8.3 ms pulse width.

Feature Summary

• Utilizes silicon-oxide passivated junction technology for superior operating characteristics and tight electrical limits.
• Housed in a void-free, transfer-molded thermosetting plastic package that offers corrosion resistance and environmental protection.
• Features high surge capability rated up to 180 W for short-duration pulses.

Applications

• Voltage regulation circuits requiring stable reference voltages.
• Protection against transient overvoltage events in electronic systems.
• General-purpose clipping and clamping applications.

Procurement Notes

Verify the specific ordering suffix when purchasing; the 'G' suffix indicates a Pb-Free package, while standard versions may differ in compliance status. Confirm the package type matches the required mounting style, as this series utilizes an axial lead configuration. Ensure that the procurement documentation explicitly states the manufacturer as onsemi or its authorized subsidiaries to guarantee authenticity and adherence to the specified electrical tolerances.

Selection Notes

Select the 1N5370B when a precise 56 V regulation point is required within a 5 W power envelope. Consider the thermal environment carefully, as the maximum operating temperature for DC conditions is limited to 150°C. Evaluate the circuit's peak current demands against the 86 mA maximum regulator current limit. This component is suitable for through-hole mounting applications where robustness against mechanical stress and environmental factors is necessary.

Part Context

This component is part of the broader 1N53 Series, which encompasses a wide range of Zener voltages from 3.3 V to 200 V. All devices in this family share the same Surmetic 40 axial lead package (Case 017AA) and utilize identical silicon-oxide passivation processes. The series is designed to provide consistent performance across various voltage ratings, allowing designers to standardize on a single package form factor for different voltage requirements.

Replacement Considerations

Cross-reference with other manufacturers offering the JEDEC 1N5370B designation, such as Central Semiconductor or STMicroelectronics, ensuring that the replacement meets the 56 V nominal voltage and 5 W power dissipation specifications. Verify that any substitute device maintains the same axial lead spacing and package dimensions to fit existing board layouts without modification.