BD46485G-TR

Overview

The BD46485G-TR is a voltage detector IC from ROHM Semiconductor, designed for supervisory circuit applications. It features a fixed delay time of 50 milliseconds and a CMOS output type with low-active reset state. The typical under-voltage detection threshold is 4.8V, with a precision of ±1%. The device supports a manual reset function and operates within a supply voltage range of 0.95V to 10V. It has a maximum operating temperature of 105°C and minimum of -40°C. The part is housed in a 5-SSOP package (SC-74A/SOT-753) and consumes approximately 0.80μA in the ON state at VDET=4.8V.

Feature Summary

• Fixed 50ms delay timer ensures stable power-up sequencing without external components.
• CMOS push-pull/totem pole output provides strong drive capability for digital logic interfaces.
• Manual reset input allows system-initiated recovery independent of voltage thresholds.
• High accuracy detection with ±1% tolerance minimizes false triggering risks.

Applications

• Microprocessor and microcontroller power supply monitoring
• Battery-operated devices requiring reliable reset signals
• Industrial control systems needing high-temperature operation
• Consumer electronics with strict power-up timing requirements

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm RoHS compliance and MSL level 1 handling requirements. Check datasheet revisions for any pinout or electrical parameter updates. Ensure replacement parts match package dimensions and thermal characteristics. Validate supply chain sources against manufacturer recommendations.

Selection Notes

Choose this component when fixed delay timing and CMOS output are required. Consider alternatives if adjustable delay or open-drain outputs are needed. Evaluate current consumption needs as it draws slightly higher quiescent current than some competitors. Verify temperature range compatibility with application environment. Confirm manual reset functionality aligns with system design architecture.

Part Context

Part of the BD46 series voltage detectors offering fixed delay times. Designed for general-purpose supervisory applications where precise timing is critical. Manufactured using CMOS technology for low power consumption. Available in compact SSOP5 packages suitable for space-constrained designs. Part number suffix TR indicates tape-and-reel packaging format.

Replacement Considerations

• BD5248G-1: Same package, adjustable delay, open-drain output

FAQ

What is the reset active state of the BD46485G-TR?

The reset output is active-low, meaning it asserts when the detected voltage falls below the threshold.

Does the BD46485G-TR include a watchdog timer?

No, this component does not integrate a watchdog timer function.

Can the delay time be adjusted externally?

No, the delay time is fixed at 50 milliseconds and cannot be modified externally.