BD46381G-TR

Overview

The BD46381G-TR is a voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply voltages in electronic circuits. It features a fixed delay time of 100 milliseconds and operates within a reset active voltage range of 0.95 to 10 volts. The device provides a CMOS output type with a manual reset function. Key electrical parameters include an under-voltage detection voltage of 3.8V (typical) and a VDET precision of ±1%. The circuit current is specified at 0.80 μA when ON and 0.85 μA when OFF at VDET=4.8V. It supports an L output current of 1.2 mA at low voltage and 5 mA at high voltage. The component operates across a temperature range of -40°C to 105°C and is housed in an SSOP5 package.

Feature Summary

• Integrates a fixed 100 millisecond delay timer for stable reset generation.
• Includes a manual reset input pin for direct control of the output state.
• Features CMOS output structure compatible with digital logic interfaces.
• Provides high precision voltage detection with ±1% accuracy tolerance.

Applications

• Monitoring microprocessor power supply rails
• Battery-operated device supervision
• Embedded system reset circuitry

Procurement Notes

Verify the specific ordering suffix TR for tape-and-reel packaging configuration. Confirm RoHS compliance status as indicated in official documentation. Check supply status for potential last-time-buy constraints or availability limitations. Ensure the SSOP5 package dimensions match the target PCB footprint requirements. Validate the 3.8V detection threshold against the specific application voltage needs.

Selection Notes

Select this component when a fixed delay period is required without external timing components. Consider the CMOS output drive capability for interfacing with standard logic families. Evaluate the manual reset feature if system-level override capabilities are necessary. Compare the operating temperature range against environmental conditions. Assess the low standby current consumption for battery-sensitive designs.

Part Context

This part belongs to the BD46 series of voltage detectors from ROHM Semiconductor. It is functionally similar to the BD5238G-1 but differs in output type and delay adjustability. The BD46381G-TR utilizes an SSOP5 package identical to its counterpart. It serves as a supervisory circuit for ensuring reliable system startup and shutdown sequences.

Replacement Considerations

The BD5238G-1 is listed as a replacement with the same package and similar detection voltage. Note that the BD5238G-1 features an open-drain output and adjustable delay, unlike the fixed-delay CMOS output of the BD46381G. Verify interface compatibility before substitution.

FAQ

What is the typical under-voltage detection voltage for the BD46381G?

The typical under-voltage detection voltage is 3.8V.

Does the BD46381G support manual reset functionality?

Yes, the device includes a manual reset input feature.

What is the reset delay time specification?

The reset delay time is fixed at 100 milliseconds.