BD49K42G-TL

Overview

The BD49K42G-TL is a single-channel voltage detector IC from the BD49Kxx series manufactured by Rohm Semiconductor. It features a fixed detection threshold of 4.2V with an accuracy of ±1%. The device operates within a supply voltage range of 2.3V to 10V and consumes a typical operating current of 900nA. It provides an active-low reset output with a push-pull/totem pole configuration and includes a reset delay time of 100µs. The component is housed in a compact 3-SSOP package, suitable for surface-mount installation across a temperature range of -40°C to +105°C.

Feature Summary

• High-precision voltage monitoring with ±1% threshold accuracy
• Ultra-low power consumption suitable for battery-operated systems
• Active-low reset signal generation with defined delay timing
• Compact surface-mount packaging for space-constrained designs

Applications

• Processor supervisor circuits requiring stable voltage monitoring
• Battery-powered portable devices needing low quiescent current
• Embedded systems with strict thermal operating requirements
• Industrial control units utilizing standard logic interfaces

Procurement Notes

This component is officially listed as obsolete or end-of-life by the manufacturer. Procurement should focus on verifying stock availability through authorized distributors or approved secondary market sources. Buyers must confirm the authenticity of the parts and check for any product change notices related to the BD49Kxx series. Due to the discontinued status, lead times may be extended, and long-term supply agreements should be evaluated carefully before integration into new production cycles.

Selection Notes

Engineers selecting this part should verify that the 4.2V threshold aligns precisely with their system's under-voltage detection requirements. The CMOS output interface must be compatible with the downstream logic family. Designers should account for the 100µs reset delay when configuring startup sequences. Alternative components within the BD49Kxx series offer different thresholds, while newer generations like the BD52xx series provide updated specifications. Ensure the 3-SSOP footprint matches the PCB layout constraints.

Part Context

The BD49K42G-TL belongs to the BD49Kxx family of voltage detectors, which are designed for high accuracy and low current consumption. This series typically offers detection voltages ranging from 2.3V to 6.0V in 0.1V increments. The 'TL' suffix indicates tape-and-reel packaging. The device is categorized under Power Management ICs (PMIC) specifically as a supervisory circuit. It shares common architectural features with other members of the BD49K series, differing primarily in the specific voltage threshold setting.

Replacement Considerations

The BD5242G-1TR is identified as a similar specification replacement option from Rohm Semiconductor.