1N4108-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N4108-1/TR is a 500 mW metallurgically bonded glass Zener diode in an axial-lead DO-35 package. It provides a nominal Zener voltage of 14 V with a standard tolerance of ±5%. The device operates within a junction and storage temperature range of -65 °C to +175 °C. Key electrical characteristics include a maximum reverse current of 40 µA at 10.7 V, a dynamic impedance of 200 Ohms, and a noise density of 40 µV/√Hz. The part is qualified per MIL-PRF-19500/435 for high-reliability applications.

Single Zener Diodes Feature Summary

• Internal metallurgical bond construction for enhanced reliability
• Hermetically sealed glass DO-35 (DO-204AH) package
• Qualified to JAN, JANTX, JANTXV, and JANS levels per MIL-PRF-19500/435
• Inherently radiation hard design

Single Zener Diodes Applications

• High-reliability military and aerospace circuits
• Voltage regulation over broad current and temperature ranges
• Reference voltage sources requiring low capacitance
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify the specific qualification level required for your application, as the base part number covers multiple grades. Confirm RoHS compliance status, noting that commercial versions may differ from mil-qualified units. Ensure the TR suffix is correctly specified if tape and reel packaging is needed instead of bulk. Check for any recent PCNs regarding assembly sites or labeling changes before finalizing orders.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed, radiation-tolerant Zener diode is necessary. The 14 V rating suits mid-range reference applications. Consider the 200 Ohm impedance for stability requirements. Verify thermal derating needs against the 500 mW limit at elevated ambient temperatures. Ensure the axial lead format fits the mechanical constraints of the target PCB layout.

Single Zener Diodes Part Context

This device belongs to the 1N4099-1 through 1N4135-1 series of 500 mW glass Zener diodes manufactured by Microchip Technology. These parts are JEDEC registered and designed for demanding environments. The series offers voltages from 1.8 V to 100 V with various tolerance options. The 1N4108-1 specifically targets the 14 V segment of this extensive lineup.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 14 V Zener voltage, 500 mW power rating, and DO-35 package. Verify if the substitute meets the same MIL-PRF-19500/435 qualification level if radiation hardness or high reliability is critical. Ensure the replacement has comparable dynamic impedance and leakage current specifications.