BU46K302G-TL

Overview

The BU46K302G-TL is a fixed-delay voltage detector IC from ROHM Semiconductor, designed for monitoring power supply voltages. It features a detection threshold of 3.0V with ±1% precision and a fixed reset delay timer of 200ms. The device operates within a supply voltage range of 0.6V to 6V and utilizes a CMOS output type active low. It consumes approximately 2.8µA in the OFF state and 2.3µA in the ON state. Hysteresis is set at VDET x 0.05. 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.
• CMOS output structure provides high noise immunity and low current consumption.
• Fixed detection voltage ensures precise monitoring without external resistor adjustments.
• Compact SSOP-3 package design facilitates space-constrained PCB layouts.

Applications

• Microprocessor system reset circuits
• Battery-powered device power management
• Portable electronic equipment supervision
• Industrial control system voltage monitoring

Procurement Notes

Verify that the BU46K302G-TL is marked as Not Recommended for New Designs (NRND). Confirm if existing stock or last-time buy options are available through authorized distributors. Ensure replacement components like BD5230G-1TR meet all electrical and mechanical requirements before finalizing procurement plans for new production runs.

Selection Notes

Select this component only for legacy system maintenance or repair where the specific 3.0V threshold and 200ms delay are required. Evaluate the BD5230G-1TR as a recommended alternative for new designs, noting differences in output type (Open Drain vs. CMOS) and package size (SSOP-5 vs. SSOP-3). Verify compatibility with existing board footprints and signal levels during migration planning.

Part Context

This part belongs to the BU45/BU46 series of highly accurate, low current consumption voltage detectors. These ICs integrate internal delay timers to simplify circuit design by removing external timing components. The series supports various detection voltages and delay times, catering to diverse supervisory needs in consumer and industrial electronics while maintaining small form factors.

Replacement Considerations

BD5230G-1TR is listed as a similar specification replacement. Note that it uses an Open Drain output instead of CMOS and comes in an SSOP-5 package rather than SSOP-3. Electrical parameters such as detection voltage and delay time should be cross-referenced to ensure functional equivalence in the target application.

FAQ

Does the BU46K302G-TL require an external capacitor for the reset delay?

No, the device has a built-in counter timer delay circuit, so no external capacitor is needed for setting the 200ms delay time.

What is the output configuration of this voltage detector?

The BU46K302G-TL features a CMOS output type that is active low.