1N5523B-1

Overview

The Microchip Technology 1N5523B-1 is a low voltage avalanche Zener diode with a nominal breakdown voltage of 5.1 V at a test current of 5 mA. It operates within a junction temperature range of -65 °C to +175 °C and dissipates up to 0.5 W. The device features a hermetically sealed axial-lead glass DO-35 package and includes an internal metallurgical bond, indicated by the '-1' suffix. It provides a voltage tolerance of ±5% (B suffix) and is qualified per MIL-PRF-19500/437 for JAN, JANTX, and JANTXV reliability levels.

Feature Summary

• Hermetically sealed axial-lead glass construction with an internal metallurgical bond option.
• Qualified for high-reliability military standards including JAN, JANTX, and JANTXV levels.
• Inherently radiation hard and nonsensitive to electrostatic discharge.
• Provides guaranteed voltage regulation across a broad operating current and temperature range.

Applications

• Voltage regulation in harsh environments requiring radiation hardness.
• Precision reference circuits utilizing tight voltage tolerances.
• Military and aerospace electronic systems demanding high reliability.

Procurement Notes

Verify that the specific order requires the metallurgical bond construction denoted by the '-1' suffix, as this affects qualification levels. Confirm the required reliability tier (JAN, JANTX, or JANTXV), which mandates the B-1, C-1, or D-1 suffix combination alongside the specified voltage tolerance. Ensure compatibility with the DO-35 through-hole mounting style.

Selection Notes

Select the 1N5523B-1 when a 5.1 V Zener voltage with ±5% tolerance is required in a ruggedized environment. This component is suitable for designs needing radiation hardness and ESD immunity. Consider the thermal derating curve if ambient temperatures exceed 25 °C. Verify that the maximum DC regulator current and impedance specifications align with the circuit's load requirements.

Part Context

This part belongs to the 1N5518 thru 1N5546 series of 0.5 watt axial-leaded glass Zener Voltage Regulators. The series offers voltages from 3.3 to 33 volts with various tolerance options. The 'B' suffix indicates a standard ±5% voltage tolerance, while the '-1' suffix specifies the internal metallurgical bond necessary for military qualification.

Replacement Considerations

Direct replacements include other parts within the 1N5518-1N5546 series with matching voltage and tolerance. Equivalent commercial versions without the '-1' suffix are available but lack the metallurgical bond and military qualification. Cross-reference with other manufacturers offering MIL-PRF-19500/437 qualified DO-35 Zener diodes.