UCD3138RMHR

Overview

The UCD3138RMHR is a highly integrated digital power controller from Texas Instruments, designed for isolated power applications. It operates within a supply voltage range of 3 V to 3.6 V and draws a typical operating current of 100 mA. The device is housed in a WQFN-40 surface-mount package and supports an extended industrial temperature range from -40°C to +125°C. It features humidity sensitivity classification and is supplied in reel packaging with a factory quantity of 2000 units.

Feature Summary

• Integrates Single Frame functionality for direct secondary-side input voltage detection without external isolation components
• Supports input voltage feedforward capabilities for enhanced dynamic response
• Provides hardware-level under-voltage protection through secondary-side sensing mechanisms

Applications

• Hard-switched full-bridge power supplies with secondary-side synchronous rectification
• Isolated power converter designs requiring integrated input voltage monitoring
• Systems needing reduced component count by eliminating optical couplers or digital isolators for UVLO

Procurement Notes

Verify the specific suffix RMHR against the official datasheet to confirm the WQFN-40 package and reel configuration. Confirm that the NRND status does not conflict with long-term production requirements. Ensure ESD handling protocols are followed due to moisture sensitivity classification. Validate that the 3V to 3.6V supply range matches the system design constraints before procurement.

Selection Notes

Select this component when designing isolated converters that benefit from secondary-side input voltage sensing. It is suitable for applications aiming to reduce bill-of-materials by removing discrete isolation barriers for voltage monitoring. Consider the WQFN-40 thermal performance and the -40°C to +125°C operating range for industrial environments.

Part Context

This part belongs to the UCD3138 family of digital power controllers, which succeeded earlier generations like the UCD30xx series. The family focuses on integrating advanced control algorithms and safety features into a single digital platform. The UCD3138RMHR specifically targets isolated topologies where precise input voltage tracking is critical for protection and efficiency.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing firmware if replacing legacy UCD30xx devices, as architectural differences may require software adaptation.