BU4338G-TR

Overview

The BU4338G-TR is a CMOS voltage detector with an adjustable delay timer, manufactured by ROHM Semiconductor. It features a typical under-voltage detection threshold of 3.8V with ±1% precision. The reset active voltage range spans from 0.7V to 7V, utilizing a CMOS output type that asserts low. The circuit operates within a temperature range of -40°C to 125°C. Key electrical parameters include a maximum power dissipation of 540mW and a delay circuit resistance of 10.0MΩ. The device is supplied in an SSOP-5 package.

Feature Summary

• Integrates an adjustable delay timer for customized reset timing control
• Provides high-precision voltage detection with ±1% accuracy tolerance
• Supports wide operating supply voltage ranges up to 7V
• Features low static current consumption suitable for battery-powered applications

Applications

• Microprocessor system reset circuits requiring precise timing delays
• Battery-operated devices needing reliable under-voltage monitoring
• Industrial control systems operating in extended temperature environments
• Portable electronics utilizing low-power supervisory logic

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the NRND status indicates end-of-life planning; ensure existing designs are validated against this lifecycle constraint. Cross-reference datasheet revisions for any parameter updates prior to integration. Validate package markings and traceability documentation to prevent counterfeit substitution during procurement.

Selection Notes

Evaluate the 3.8V threshold against target system rail stability requirements. Assess whether the adjustable delay feature aligns with startup sequence specifications. Compare static current consumption against available power budgets. Ensure the SSOP-5 footprint matches PCB layout constraints. Verify thermal performance within the specified -40°C to 125°C operational range for the intended application environment.

Part Context

This component belongs to the BU43xxG series of voltage detectors designed for general-purpose electronic equipment. It serves as a supervisory circuit ensuring stable operation by monitoring supply voltages. The series emphasizes low power consumption and compact packaging, targeting consumer and industrial applications where space and energy efficiency are critical design factors.

Replacement Considerations

The BD5238G-1TR is documented as a recommended replacement with the same pinout and package. Both components share identical under-voltage detection voltage characteristics. Designers should verify output type differences and current drive capabilities when transitioning between these specific part numbers.