BD4840FVE-TR

Overview

The BD4840FVE-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It operates within a maximum supply voltage of 7 V and features an open-drain output type with a low active reset state. The device provides a typical under-voltage detection threshold of 4.0 V with a precision of ±1%. It includes an adjustable delay timer function and maintains a hysteresis voltage defined as VDET multiplied by 0.05. The component supports a reset active voltage range from 0.7 V to 7 V and is housed in a VSOF-5 surface-mount package.

Feature Summary

• Integrates an adjustable delay timer circuit for customizable reset timing control
• Features an open-drain output structure compatible with various logic families
• Provides high-precision voltage detection with specified hysteresis characteristics

Applications

• Portable electronic devices requiring precise power supply monitoring
• Embedded systems needing configurable reset delay sequences
• Battery-operated equipment utilizing low-power supervision circuits

Procurement Notes

Verify the obsolete status and last-time-buy designation before procurement planning. Confirm that the VSOF-5 package dimensions match the target PCB footprint. Ensure the open-drain output configuration aligns with the downstream circuit requirements. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.

Selection Notes

Select this component when an adjustable delay timer is required alongside standard voltage supervision. The open-drain output allows flexibility in pull-up voltage selection. Consider the ±1% precision and hysteresis settings for noise immunity. Evaluate the low operating current against system power budgets. Verify compatibility with the intended thermal environment and mounting constraints.

Part Context

This part belongs to the BU48 series of standard voltage detectors from ROHM Semiconductor. It serves as a specialized supervision IC offering adjustable timing features not found in basic reset generators. The VSOF-5 package provides a compact solution for space-constrained designs. It complements other fixed-delay or non-adjustable variants within the manufacturer's portfolio.

Replacement Considerations

The BD5240G-1 is listed as a recommended replacement with similar specifications. Note that the BD5240G-1 utilizes an SSOP-5 package rather than VSOF-5, requiring mechanical adaptation. Both parts share the same 4.0 V detection threshold and open-drain output type.