RE46C190S16F

Sensor And Detector Interfaces Overview

The RE46C190 is a low-power, low-voltage CMOS photoelectric smoke detector ASIC designed for two AA battery operation. It features an internal oscillator that powers detection circuitry every 10 seconds to minimize standby current. The device includes a gain-selectable photo amplifier, programmable IRED driver (50-200 mA), and DC-DC boost converter. Electrical characteristics include a supply voltage range of 3V to 5.0V, standby current of 3-12 µA, and operating temperature from -10°C to +60°C. It supports interconnect for up to 40 detectors, temporal/continuous horn patterns, and local alarm memory.

Sensor And Detector Interfaces Feature Summary

• Integrated photoelectric detection with gain-selectable amplifier and internal infrared emitter diode driver
• Supports interconnection of up to 40 units for synchronized alarm signaling
• Includes supervisory tests for low battery and chamber integrity with audible indicators
• Features push-to-test capability and adjustable hush sensitivity modes

Sensor And Detector Interfaces Applications

• Photoelectric-type smoke detectors complying with UL217 and UL268 specifications
• Residential and commercial fire alarm systems requiring low power consumption
• Multi-unit interconnected alarm networks

Sensor And Detector Interfaces Procurement Notes

Verify component authenticity through authorized Microchip distributors or direct channels. Confirm the datasheet revision matches DS20002271C. Note that this part is not recommended for new designs; the RE46C191 is the preferred replacement. Ensure compliance with RoHS directives if required by your specific application standards.

Sensor And Detector Interfaces Selection Notes

Select this component only for legacy designs or maintenance upgrades where the RE46C190 is already established. For new product development, utilize the RE46C191 as explicitly recommended by the manufacturer. Consider the limited operating temperature range (-10°C to +105°C max) and ensure external components meet the high peak current requirements of the boost converter.

Sensor And Detector Interfaces Part Context

The RE46C190 belongs to Microchip's portfolio of specialized analog and mixed-signal integrated circuits for safety applications. It is specifically categorized as a CMOS photoelectric smoke detector ASIC. This component represents an earlier generation in Microchip's smoke detection line, preceding the enhanced RE46C191 model which offers improved features for long-term drift compensation.

Sensor And Detector Interfaces Replacement Considerations

Microchip explicitly recommends the RE46C191 as the improved version for new designs. The RE46C191 addresses limitations regarding long-term drift and offers enhanced performance characteristics while maintaining pin compatibility for many applications.