1N4099/TR

Single Zener Diodes Overview

The Microchip Technology 1N4099/TR is a 500 mW metallurgically bonded glass Zener diode in the axial-lead DO-35 package. It offers a nominal Zener voltage of 6.8 V with a test current (IZT) of 250 µA. Maximum reverse current is 5.2 µA, and maximum noise density is 40 µV/√Hz. The device features a maximum Zener impedance of 1.0 Ω and a temperature coefficient of +0.060 %/°C. Qualified per MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels, it operates within a junction temperature range of -65 to +175 °C.

Single Zener Diodes Feature Summary

• Internal metallurgical bond construction for high reliability.
• Qualified to military standards including JANS level radiation hardness.
• Low noise density performance suitable for precision regulation.
• Hermetically sealed glass axial-lead packaging.

Single Zener Diodes Applications

• High-reliability voltage regulation in aerospace systems.
• Precision reference circuits requiring low noise.
• Radiation-hardened electronic assemblies.
• Military-grade power supply stabilization.

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these affect qualification testing and cost. Confirm RoHS compliance status if environmental regulations apply, noting that commercial versions may differ from mil-qualified parts. Ensure the TR suffix indicates tape and reel packaging availability from the supplier. Cross-reference the exact part number against the manufacturer's latest datasheet to confirm current production status and any potential obsolescence notices before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a stable 6.8 V reference is needed in harsh environments. The positive temperature coefficient must be accounted for in thermal design. Verify that the 250 µA test current aligns with your circuit's biasing capabilities. Consider the low leakage current for high-impedance applications. Ensure the DO-35 package fits the mechanical constraints of the PCB layout.

Single Zener Diodes Part Context

This part belongs to the 1N4099-1 through 1N4135-1 series of 500 mW Zener diodes manufactured by Microsemi (now Microchip). These devices are designed for demanding applications requiring robust voltage regulation. The series spans voltages from 1.8 V to 100 V, offering various tolerance options. The 1N4099 specifically targets the 6.8 V segment, providing a balance of low noise and moderate power dissipation in a standard axial package.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 6.8 V Zener voltage, 500 mW power rating, and DO-35 package. Verify equivalent MIL-PRF-19500/435 qualification levels if radiation hardness is critical. Check for matching noise density and temperature coefficient specifications to ensure circuit stability is maintained during substitution.