BD4721G-TR

Overview

The BD4721G-TR is a standard voltage detector manufactured by ROHM Semiconductor, designed for monitoring single power supply lines. It features an open collector output and operates within a supply voltage range of 0.85 V to 10 V. The device provides a typical under-voltage detection threshold of 2.1 V with high accuracy of ±1%. It functions without a reset delay timer or manual reset capability, making it suitable for applications requiring immediate response to voltage drops. The component supports a wide operating temperature range from -40°C to +75°C and is housed in a compact SSOP-5 package.

Feature Summary

• Provides precise under-voltage detection with a typical threshold of 2.1 V and ±1% accuracy
• Features an open collector output compatible with various logic families
• Operates over a wide input voltage range from 0.85 V to 10 V
• Designed for low static current consumption to support battery-powered systems

Applications

• Portable electronic devices requiring reliable power supervision
• Battery-operated equipment needing low quiescent current
• General-purpose microprocessor reset circuits
• Embedded systems monitoring single rail voltages

Procurement Notes

Verify the specific ordering suffix and package variant against the latest manufacturer datasheet before procurement. Confirm that the BD4721G-TR meets all electrical requirements for your target application, particularly regarding the open collector output configuration and operating temperature limits. Ensure compatibility with your system's voltage levels and logic thresholds. Check for any end-of-life notices or recommended replacement parts if long-term availability is a concern.

Selection Notes

Select this component when a simple, cost-effective voltage monitor with high accuracy is required. The open collector output allows for flexible interfacing with different logic levels. Consider the ±1% threshold precision for critical applications where tight voltage margins are necessary. Evaluate the static current consumption against battery life requirements. Ensure the SSOP-5 package fits within the available PCB space constraints.

Part Context

The BD4721G-TR belongs to ROHM's standard voltage detector family, specifically the BD47 series. These devices are designed for general-purpose power management tasks. The part number indicates a tape-and-reel packaging format, suitable for automated surface-mount assembly processes. It is distinct from other variants in the series that may offer different thresholds, reset delays, or additional features like watchdog timers.

Replacement Considerations

The BD5221G-1TR is documented as a recommended replacement with the same SSOP-5 package. Verify pinout compatibility and electrical parameter alignment, noting differences such as adjustable delay and open drain output in the substitute.