1N4708UR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N4708UR-1/TR is a 500 mW surface mount Zener voltage regulator housed in a hermetically sealed glass DO-213AA (MELF) package. It provides a nominal Zener voltage of 22 V with a standard tolerance of ±5%. The device operates at a low test current of 50 µA and supports a junction temperature range from -65°C to +175°C. The 'TR' suffix indicates tape and reel packaging, while the '-1' suffix denotes an internally metallurgically bonded construction for enhanced reliability.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA MELF surface mount package
• Internally metallurgically bonded die for high reliability
• Low Zener test current of 50 µA
• Radiation hard design

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• High-reliability electronic circuits requiring ESD robustness
• Space or military applications utilizing MIL-PRF-19500 screening options

Single Zener Diodes Procurement Notes

Verify the specific ordering suffixes to confirm exact specifications. The '-1' suffix confirms the internal metallurgical bond, which differs from standard commercial versions. The 'TR' suffix specifies tape and reel packaging; bulk quantities may vary by manufacturer lot. Confirm RoHS compliance status, as it applies only to commercial grade devices. Ensure the required voltage tolerance matches the standard ±5% unless a tighter tolerance variant is explicitly ordered.

Single Zener Diodes Selection Notes

Select this component when a surface mount Zener diode with hermetic sealing and high thermal stability is required. The DO-213AA package offers a compact footprint suitable for automated assembly. Consider the 50 µA test current for low-power biasing applications. Verify that the 500 mW power dissipation rating aligns with the circuit's thermal management capabilities and ambient operating conditions.

Single Zener Diodes Part Context

This part belongs to the 1N4678UR-1 through 1N4717UR-1 series of 0.5 W glass surface mount Zener diodes manufactured by Microsemi (now Microchip). The series covers a voltage selection from 1.8 V to 43 V. These devices serve as surface mount equivalents to the JEDEC registered 1N4678 through 1N4717 axial leaded series, maintaining similar electrical characteristics in a smaller form factor.

Single Zener Diodes Replacement Considerations

Direct replacements include other 1N4708 variants in DO-213AA packages with matching 22 V Zener voltage and 500 mW power rating. Verify pinout polarity and hermetic sealing requirements if substituting non-MELF packages. Ensure the replacement device meets the same junction temperature and leakage current specifications.