1N5308-1

Overview

The Microchip Technology 1N5308-1 is a military-grade current regulator diode designed for stable current control across wide voltage ranges. Qualified under MIL-PRF-19500/463, it operates within the JAN, JANTX, JANTXV, and JANS levels. The device features a maximum anode-to-cathode voltage of 100 V and a regulated current of 2.97 mA with standard 10% tolerance. It dissipates up to 500 mW and functions reliably between -65°C and +175°C junction temperature. Packaged in the axial DO-7 (DO-204AA) through-hole format, it utilizes a double-plug internal bond connection with a larger active die element.

Feature Summary

• Provides constant current regulation over a broad voltage range as a counterpart to Zener diodes.
• Features high source impedance for effective current stability.
• Utilizes a double-plug internal bond connection with a large die element for unique current limiting function.

Applications

• Military aerospace systems requiring MIL-PRF-19500/463 qualified components.
• Circuits needing precise current limiting or biasing where voltage varies significantly.
• Replacement for Zener diodes in applications requiring current rather than voltage regulation.

Procurement Notes

Verify the specific qualification level (JAN, JANTX, JANTXV, or JANS) required for your application, as performance specifications vary by grade. Confirm package authenticity and lead wire integrity upon receipt. Ensure storage conditions meet moisture sensitivity requirements before soldering. Cross-reference datasheet revisions to confirm parameter consistency with design specifications.

Selection Notes

Select this component when a fixed current source is needed independent of voltage fluctuations within the operating range. Compare the 2.97 mA regulated current against circuit load requirements. Consider the 100 V maximum voltage rating to ensure adequate headroom. Evaluate thermal management needs given the 500 mW power dissipation limit at elevated temperatures.

Part Context

This part belongs to the popular 1N5283-1 through 1N5314-1 series of 0.5 watt current regulators. The series offers a selection of currents from 0.22 mA to 4.7 mA in standard 10% tolerances. These devices are designed to complement Zener diodes by regulating current over a broad voltage range instead of voltage over a broad current range.

Replacement Considerations

Commercial equivalents exist but lack military qualification. Verify if JAN, JANTX, JANTXV, or JANS grades are mandatory for radiation hardness or reliability standards. Check if alternative current values from the same series (e.g., 1N5307-1 or 1N5309-1) better match specific circuit requirements.