BD9251FV-GE2

Overview

The BD9251FV-GE2 is a single-chip amplifier and comparator IC designed for pyroelectric infrared sensors in human body detection applications. It integrates two amplifiers, a comparator, and a built-in voltage regulator to simplify circuit design and reduce standby power consumption. The device operates within a supply voltage range of 2.97 V to 6.0 V, with a typical supply current of 300 µA at no load. Key electrical characteristics include an amplifier gain of 46 dB, a unity gain frequency of 1 MHz, and a DRAIN output voltage of 2.3 V (typical). It supports an operating temperature range from -30°C to +75°C and is housed in an SSOP-B14 package.

Feature Summary

• Integrates dual amplifiers and a comparator specifically optimized for pyroelectric infrared sensor signal processing.
• Includes a built-in voltage regulator to provide stable power for the connected sensor element.
• Features a dedicated moving detector output to identify motion direction when used with dual-type sensors.
• Designed for low-power operation to minimize standby current requirements in always-on devices.

Applications

• Security systems
• Sensor lights and lighting control
• Air conditioners and ventilation fans
• Web cameras and PC displays

Procurement Notes

Verify the current manufacturing status before procurement, as this component may be classified as NRND (Not Recommended for New Designs). Confirm that the SSOP-B14 package dimensions and pinout match the target PCB layout. Ensure that the ambient operating conditions remain within the specified -30°C to +75°C range to maintain performance reliability. Check for any specific handling precautions regarding electrostatic discharge during storage and mounting.

Selection Notes

Select this IC for applications requiring a compact solution for pyroelectric sensor interface with minimal external components. Consider the 46 dB amplifier gain and 1 MHz bandwidth for appropriate signal conditioning needs. Evaluate the 300 µA typical supply current against system power budgets. Ensure the input offset voltage and output drive capabilities meet the specific requirements of the downstream logic or microcontroller interface.

Part Context

The BD9251FV belongs to ROHM's line of sensor interface ICs tailored for human body detection. It consolidates functions that previously required multiple discrete components into a single chip. This integration facilitates space-saving designs and reduces the complexity of circuit constants selection. The device is part of a series focused on optimizing power consumption for battery-operated or energy-efficient electronic equipment.

Replacement Considerations

Check for direct pin-compatible replacements if the BD9251FV-GE2 is unavailable. Verify that any substitute maintains the same SSOP-B14 package and electrical parameters, including supply voltage range and amplifier gain. Ensure the alternative component supports the required operating temperature range and offers similar low-power characteristics for seamless integration.