1N5523B/TR

Overview

The Microchip Technology 1N5523B/TR is a low voltage avalanche Zener diode rated at 0.5 W, housed in a hermetically sealed axial-lead glass DO-35 (DO-204AH) package. It provides a nominal Zener voltage of 5.1 V with a ±5% tolerance and a maximum dynamic impedance of 26 Ohms at a test current of 5 mA. The device operates within a junction temperature range of -65°C to +175°C and features a maximum reverse leakage current of 2 µA at 2.5 V.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• Guaranteed voltage regulation across specified operating currents
• Minimal capacitance characteristics suitable for high-frequency applications
• Radiation hard design compliant with MIL-STD-750 Method 1020

Applications

• Voltage regulation over broad operating current ranges
• Reference voltage sources in precision circuits
• Protection against electrostatic discharge (ESD)
• Clamping applications in harsh environments

Procurement Notes

Verify the specific suffix configuration when ordering. The 'TR' suffix indicates tape and reel packaging per EIA-296 standards. Confirm RoHS compliance status as it varies by commercial grade availability. Ensure the required voltage tolerance matches the B suffix designation. Check lead plating specifications if solderability requirements are strict.

Selection Notes

Select this component for applications requiring stable voltage regulation in extreme temperatures. The DO-35 package offers flexible axial-lead mounting terminals. Consider the internal metallurgical bond option if military qualification levels such as JAN or JANTXV are necessary. Evaluate thermal resistance values for derating calculations on FR4 printed circuit boards.

Part Context

This part belongs to the 1N5518 through 1N5546 series of 0.5 watt axial-leaded glass Zener Voltage Regulators. The series covers a voltage selection from 3.3 to 33 volts. The standard tolerance is ±5%, designated by the B suffix. These devices are JEDEC registered and qualified per MIL-PRF-19500/437.

Replacement Considerations

Equivalent parts include 1N5523C and 1N5523D for tighter voltage tolerances. Commercial equivalents may lack hermetic sealing. Verify that replacement components maintain the same DO-35 package dimensions and power dissipation ratings.