1N4126UR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N4126UR-1/TR is a glass surface mount Zener voltage regulator with a nominal breakdown voltage of 51 V. It operates within the 1N4099UR through 1N4135UR series and utilizes a hermetically sealed DO-213AA (SOD80/MLL34) package. The device features an internal metallurgical bond, indicated by the -1 suffix, and is supplied in tape and reel packaging per EIA-481-1-A standards. Electrical characteristics include a maximum Zener impedance of 300 Ohms at a test current of 250 µA, a maximum reverse leakage current of 4 µA, and a typical temperature coefficient of 0.090 %/°C. Steady-state power dissipation is rated at 0.5 watts.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA MELF-style package
• Internal metallurgical bond construction for enhanced reliability
• Inherently radiation hard design
• ESD nonsensitive per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• Voltage regulation in harsh environments
• Reference voltage sources
• Protection circuits requiring radiation hardness

Single Zener Diodes Procurement Notes

Verify that the ordering suffix includes both -1 and /TR to confirm the presence of the internal metallurgical bond and tape-and-reel packaging respectively. Confirm compliance requirements such as RoHS status if applicable, as standard versions may differ from lead-free variants. Ensure the procurement specification matches the exact part number to avoid receiving non-bonded or bulk-packaged equivalents.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode with a specific 51 V breakdown is required. The internal metallurgical bond makes it suitable for high-reliability applications where standard junction bonds might fail. Consider the thermal resistance of 150 °C/W junction-to-end-cap for heat dissipation calculations on FR4 PCBs. Verify that the operating temperature range of -65°C to +175°C meets the environmental constraints of the target system.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division series of 0.5 Watt Glass Surface Mount Zeners. It serves as the surface mount equivalent to JEDEC registered axial-leaded parts like the 1N4126. The series covers a voltage range from 1.8 to 100 V, offering various tolerance options. The -1 suffix specifically denotes the internal metallurgical bond option available across this product family.

Single Zener Diodes Replacement Considerations

Direct replacements include other 1N4126 variants with different packaging or bond types, such as the standard 1N4126UR without the metallurgical bond, or axial equivalents like the 1N4126 in DO-35 packages. Cross-reference with MLL4126 equivalents. Ensure any substitute maintains the required hermetic seal and radiation hardness if those are critical specifications.