MC145011P

Sensor And Detector Interfaces Overview

The MC145011P is a CMOS photoelectric smoke detector IC designed for line-powered applications. It operates within a supply voltage range of 6 to 12 V and an ambient temperature range of -10 to 60 °C. The device integrates analog and digital circuitry to interface with infrared photoelectric chambers, utilizing variable-gain amplification for smoke detection. Key electrical parameters include a standby supply current of 20 mA (with LED illuminated) and a peak current of 45 mA. It features short-circuit-protected I/O drivers capable of interconnecting up to 40 units for common signaling. The component is housed in a 16-pin Plastic DIP package.

Sensor And Detector Interfaces Feature Summary

• Integrated variable-gain photo amplifier for direct interfacing with IR detectors
• On-chip push-pull drivers for external piezoelectric transducers
• Wired-OR I/O capability for multi-unit common signaling
• Low-supply detection and chamber sensitivity monitoring circuits

Sensor And Detector Interfaces Applications

• Photoelectric smoke detectors compliant with UL217 specifications
• Smoke alarm systems adhering to UL268 standards
• Line-powered fire detection units requiring low standby power

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix when sourcing components. The 'P' suffix designates the standard plastic DIP package. Ensure compatibility with existing PCB footprints and lead configurations. Confirm that the procurement channel provides genuine Freescale Semiconductor products to guarantee adherence to original electrical characteristics and reliability standards.

Sensor And Detector Interfaces Selection Notes

Select this component for designs requiring a complete single-chip solution for photoelectric smoke sensing. It is suitable for applications needing integrated horn driving and multi-unit synchronization via the I/O pin. Consider the 16-pin DIP package constraints during layout. Evaluate the 6 to 12 V operating range against the available power supply rails to ensure stable operation under all expected load conditions.

Sensor And Detector Interfaces Part Context

The MC145011 is part of the Freescale Semiconductor sensor portfolio, specifically engineered for safety and security applications. It represents an advanced CMOS technology node aimed at reducing power consumption while maintaining high sensitivity in smoke detection environments. This component serves as a core processing unit for standalone or networked smoke alarm devices.

Sensor And Detector Interfaces Replacement Considerations

The MCZ145011DW is a documented alternative offering identical functionality in a SOIC package. Verify pinout compatibility and thermal performance differences between the DIP and SOIC form factors before substitution.

Sensor And Detector Interfaces FAQ

How does the MC145011 distinguish between local and remote smoke conditions?

A local smoke condition extinguishes the visible LED and activates the I/O driver to signal remote units. A remote smoke condition keeps the LED illuminated while sounding the pulsating audible alarm.

What is the function of the I/O pin in a multi-unit system?

The I/O pin allows up to 40 units to be interconnected for common signaling. It acts as a wired-OR output to trigger alarms on other units and can also control escape lights or auto-dialers.

How is the low-supply condition indicated?

A low-supply condition triggers a beep or chirp from the piezoelectric transducer. The LED status depends on whether a smoke test is active, but the chirp distinguishes it from normal operation.