BU4938F-TR

Supervisors Overview

The BU4938F-TR is a standard CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply rails. It features a typical under-voltage detection threshold of 3.8 V with a precision of ±1%. The device operates within a reset active voltage range of 0.7 V to 7 V and supports a maximum supply voltage of 7 V. Key electrical characteristics include a circuit current of 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8 V, with a hysteresis voltage defined as VDET x 0.05. It utilizes an SOP4 package and functions across a temperature range of -40°C to +125°C.

Supervisors Feature Summary

• CMOS output type providing low-level reset signal upon undervoltage conditions
• High accuracy detection voltage with ±1% precision tolerance
• Ultra-low current consumption suitable for battery-powered applications
• Wide operating temperature range from -40°C to +125°C

Supervisors Applications

• Microcontroller system reset circuits
• Logic circuit power supervision
• Battery-operated electronic devices
• Portable equipment power management

Supervisors Procurement Notes

Verify the obsolete status of this component before procurement, as it may be subject to discontinuation. Confirm that the SOP4 package and specific 3.8V threshold meet design requirements. Check for recommended replacement parts such as the BD5238G-1 series if long-term availability is critical. Ensure RoHS compliance documentation is available for regulatory adherence.

Supervisors Selection Notes

Select this part when a fixed 3.8V threshold is required without manual reset or watchdog functionality. Consider the CMOS output drive capability and low standby current for power-sensitive designs. Evaluate the SOP4 footprint constraints against PCB layout limitations. Compare performance metrics with newer alternatives in the BD52xx series for improved specifications.

Supervisors Part Context

This component belongs to the ROHM standard voltage detector series, which offers high-accuracy detection voltages in 0.1V increments. The series includes both Nch open drain and CMOS output types to accommodate various interface requirements. These detectors are engineered for reliability in consumer electronics and industrial applications requiring precise power monitoring.

Supervisors Replacement Considerations

The BD5238G-1 is listed as a similar specification replacement with an SSOP5 package and adjustable delay timer.