BD5342G-TR

Overview

The BD5342G-TR is a CMOS voltage detector IC from Rohm Semiconductor, designed for simple reset and power-on reset applications. It features a fixed detection voltage threshold of 4.2V with a precision of ±1%. The device provides a low-active push-pull/totem pole output and supports an adjustable delay timer controlled by an external capacitor. It operates within a supply voltage range of 0.95V to 10V and consumes ultra-low current, typically 0.85µA at Vdet=4.8V. The component is housed in a compact 5-SSOP (SC-74A) package and functions reliably across a temperature range of -40°C to +105°C.

Feature Summary

• Adjustable delay time functionality enabled by connecting an external capacitor to the delay pin.
• CMOS push-pull output structure providing strong drive capability without requiring pull-up resistors.
• Ultra-low current consumption design suitable for battery-powered or energy-efficient systems.
• High accuracy voltage detection with tight tolerance specifications for reliable system monitoring.

Applications

• Microcontroller reset circuits requiring precise power-on sequencing.
• Logic circuit supervision to prevent erratic behavior during voltage transitions.
• Battery-operated devices needing efficient voltage monitoring with minimal quiescent current.

Procurement Notes

Verify the specific suffix and packaging type when ordering, as availability may vary between tape-and-reel and cut-tape formats. Confirm that the 4.2V threshold matches the target application requirements, as this value is fixed for this part number. Check for end-of-life status or obsolescence notices from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when a fixed 4.2V threshold is required alongside adjustable reset timing. Compare against the BD5242G series if an open-drain output is preferred instead of the CMOS push-pull configuration. Ensure the external capacitor selection aligns with the desired delay duration, as the internal circuitry relies on this component for timing control.

Part Context

This part belongs to the BD53xx series of free delay time setting CMOS voltage detectors. It shares architectural similarities with the BD52xx series but differs in output stage technology. The series is characterized by high accuracy and low power consumption, targeting portable electronics and industrial control systems where space and efficiency are critical constraints.

Replacement Considerations

The BD5342G-2CGTR is listed as a manufacturer-recommended substitute with similar pinout and package characteristics. The BD5242G-1TR serves as a functional alternative, though it utilizes an N-channel open-drain output rather than the CMOS push-pull structure found in the BD5342G-TR.

FAQ

How is the reset delay time determined for the BD5342G-TR?

The delay time is not fixed internally; it is controlled by the value of an external capacitor connected to the designated delay pin.

What is the active state of the reset output?

The reset output is active low, meaning it asserts a low signal when the monitored voltage falls below the detection threshold.