1N5519B (DO35)

Overview

The Microsemi 1N5519B is a low voltage avalanche Zener diode rated at 3.6 V nominal breakdown voltage with a ±5% tolerance, housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5 W steady-state power. The device features a maximum dynamic impedance of 24 Ω at the test current of 20 mA, ensuring stable voltage regulation across broad operating conditions.

Feature Summary

• Hermetically sealed glass axial-lead construction for environmental protection
• Inherently radiation hard design suitable for harsh environments
• ESD nonsensitive per MIL-STD-750 Method 1020
• Minimal capacitance characteristics

Applications

• Voltage regulation over broad operating current and temperature ranges
• Precision instrumentation requiring minimal voltage change
• Radiation-hardened electronic systems

Procurement Notes

Verify that the specific part number matches the required JEDEC type designation and tolerance suffix. Confirm whether military qualification levels such as JAN, JANTX, or JANTXV are necessary for the application, as these require specific metallurgical bond options and tighter tolerances. Ensure compliance requirements regarding RoHS status align with the commercial grade availability.

Selection Notes

Select this component when a precise 3.6 V reference is needed in a standard through-hole configuration. Consider the internal metallurgical bond option if higher reliability under thermal stress is required. Evaluate the maximum DC regulator current and leakage specifications against circuit load requirements to ensure proper operation within the specified breakdown region.

Part Context

This device belongs to the 1N5518 thru 1N5546 series of 0.5 watt axial-leaded glass Zener Voltage Regulators. The series provides a selection from 3.3 to 33 volts with various tolerance options. The 1N5519B specifically targets the lower end of this voltage range, offering tight regulation capabilities within the standard DO-35 form factor widely used in legacy and ruggedized electronics.

Replacement Considerations

Equivalent parts include JAN1N5519B-1 and 1N5519A-1. Verify that replacement units maintain the same DO-35 package dimensions and electrical parameters, particularly the 3.6 V nominal voltage and ±5% tolerance.