BU45L342G-TL

Overview

The BU45L342G-TL is a fixed delay time voltage detector IC from ROHM Semiconductor, designed for monitoring power supply voltages. It features a detection threshold of 3.4 V with an accuracy of ±1%. The device operates within a supply voltage range of 0.6 V to 6 V and consumes a typical operating current of 2.8 µA. It provides a CMOS open-drain output with a fixed reset delay timer of 200 ms. The component is housed in an SSOP-3 package and supports an operating temperature range from -40°C to +105°C.

Feature Summary

• Built-in counter timer delay circuit eliminates the need for external capacitors for delay time setting.
• High accuracy voltage detection with ±1% precision ensures reliable system supervision.
• Low current consumption design suitable for battery-powered applications.
• Fixed reset delay timer simplifies circuit design by removing external timing components.

Applications

• Power supply voltage monitoring in portable electronic devices
• System reset generation in microcontroller-based circuits
• Battery backup switching supervision

Procurement Notes

Verify component authenticity through authorized distributors as this part is obsolete. Confirm package integrity and moisture sensitivity handling requirements before assembly. Check for RoHS compliance documentation. Ensure replacement parts meet similar electrical specifications if sourcing alternatives due to discontinuation status.

Selection Notes

Select this component when a fixed 200 ms delay is required without external timing components. Consider the 3.4 V threshold and ±1% accuracy for precise voltage supervision needs. Evaluate the low 2.8 µA current consumption for power-sensitive designs. Verify compatibility with the SSOP-3 package constraints and industrial temperature range requirements.

Part Context

This voltage detector belongs to the BU45/BU46 series, which are characterized by high accuracy and low current consumption. The series integrates internal delay timers to reduce external component count. The BU45L342G-TL specifically targets applications requiring reliable power supervision with minimal peripheral components.

Replacement Considerations

BD5234G-1TR is listed as a recommended replacement with similar specifications. Note that the substitute uses an SSOP-5 package instead of SSOP-3, requiring layout adjustments. The replacement offers adjustable delay timing rather than fixed delay.

FAQ

Does the BU45L342G-TL require an external capacitor for the reset delay timer?

No, the device has a built-in counter timer delay circuit, so no external capacitor is needed for setting the delay time.

What is the output type of the BU45L342G-TL?

The output type is CMOS open-drain.