1N4737UR-1

Overview

The 1N4737UR-1 is a Zener diode manufactured by Microchip Technology, designed for surface mount applications. It utilizes the DO-213AA (SOD-80) package and operates with a nominal Zener voltage of 7.5V. The device features a power dissipation rating of 500mW and a standard voltage tolerance of ±5%. It is constructed using silicon technology and offers an extended operating temperature range from -65°C to +175°C. This component serves as a surface mount equivalent to the JEDEC registered 1N4737 series, providing reliable voltage regulation in compact electronic designs.

Feature Summary

• Surface mount construction compatible with automated assembly processes
• Internal metallurgical bond between metal slugs and silicon die for enhanced reliability
• Hermetically sealed glass encapsulation in a MELF-style package
• Extended high-temperature operational capability suitable for demanding environments

Applications

• Voltage regulation in surface mount circuit boards
• Overvoltage protection for sensitive semiconductor components
• Reference voltage sources in precision measurement equipment
• Clamping circuits in high-reliability aerospace or military systems

Procurement Notes

Verify the specific suffix UR-1 against official Microchip documentation to confirm it denotes the standard commercial grade variant rather than a screened high-reliability version. Ensure the procurement specification matches the required DO-213AA footprint and lead configuration. Confirm RoHS compliance status if environmental regulations apply to the final assembly, as historical data indicates mixed compliance statuses within this product family.

Selection Notes

Select the 1N4737UR-1 when a 7.5V reference is required in a low-profile surface mount form factor. Consider the 500mW power limit and ensure adequate thermal management on the PCB. Compare against through-hole equivalents like the 1N4737A if space constraints are not critical. Verify that the ±5% tolerance meets the circuit requirements without needing post-assembly trimming or selection.

Part Context

This component belongs to the broader 1N47xx series of Zener diodes produced by Microchip Technology. It represents the surface mount evolution of traditional axial leaded regulators, offering similar electrical characteristics in a smaller footprint. The UR-1 designation typically identifies the standard commercial grade version within the Microchip portfolio, distinct from hermetically sealed or military-screened variants.

Replacement Considerations

Direct replacements include other manufacturers' DO-213AA packaged Zener diodes rated at 7.5V and 500mW. Cross-reference part numbers such as those from ON Semiconductor or Vishay that specify identical voltage tolerance and thermal ratings. Ensure pinout compatibility and verify that any substitute maintains the same maximum reverse leakage current specifications.