RE46C166SW16TF Equivalent & Substitute Parts

Part Overview

The RE46C166SW16TF is a photoelectric smoke detector integrated circuit manufactured by Microchip Technology, classified as an Interface IC in the 16-SOIC surface mount package. This component is currently listed as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and production continuity. The part operates as a voltage-output smoke detection sensor with photoelectric input sensing technology.

Substiute Parts

RE46C166SW16TF

Microchip TechnologyIn Stock: 1040RE46C166SW16TF Datasheet

Current PartRFQ

RE46C145SW16TF

Microchip TechnologyIn Stock: 1127RE46C145SW16TF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RE46C166SW16TF is determined by the following critical parameters:

• Package Compatibility: 16-SOIC surface mount package with identical 0.295" (7.50mm) width
• Functional Type: Photoelectric smoke detector with voltage output
• Operating Temperature Range: -25°C ~ 75°C
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status
• Moisture Sensitivity: MSL 1 (Unlimited)

The RE46C145SW16TF meets all substitution criteria as a direct equivalent. Both parts share identical package specifications, operating temperature ranges, and regulatory compliance profiles. The substitute part is manufactured by the same supplier (Microchip Technology) and maintains functional compatibility as a photoelectric smoke detector IC with voltage output.

Parameter Comparison

Engineering Selection Recommendations

The RE46C145SW16TF is the qualified substitute for the obsolete RE46C166SW16TF. Selection of this alternative is supported by:

• Active Product Status: The substitute part maintains active production status with Microchip Technology, ensuring long-term availability and supply chain continuity
• Identical Package Specification: Both parts utilize the 16-SOIC surface mount package with matching pinout and mechanical dimensions, enabling direct PCB compatibility without layout modifications
• Regulatory Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements
• Functional Equivalence: Both parts operate as photoelectric smoke detector ICs with voltage output across the identical -25°C ~ 75°C temperature range
• Supply Current Improvement: The substitute part operates at 4 µA supply current compared to 6 µA for the main part, representing a 33% reduction in power consumption

Frequently Asked Questions (FAQ)

Q: Can the RE46C145SW16TF be used as a direct replacement for RE46C166SW16TF in existing designs?

A: Yes. Both parts share identical 16-SOIC package specifications, pinout compatibility, and operating temperature ranges. No PCB modifications or design changes are required for substitution.

Q: What is the primary difference between these two parts?

A: The substitute part (RE46C145SW16TF) operates at 4 µA supply current versus 6 µA for the main part. This represents improved power efficiency while maintaining all other functional and mechanical specifications.

Q: Are there any compliance or regulatory differences between the parts?

A: No. Both parts maintain identical ROHS3 compliance status, REACH unaffected designation, and MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Why is the RE46C166SW16TF listed as obsolete?

A: The main part has been discontinued by Microchip Technology. The RE46C145SW16TF serves as the active production alternative for this application.

Q: Is the 16-SOIC package suitable for automated assembly?

A: Yes. The 16-SOIC surface mount package is standard for automated pick-and-place assembly processes. Both parts are available in Tape & Reel packaging for high-volume production.

Q: Do both parts operate across the same temperature range?

A: Yes. Both the RE46C166SW16TF and RE46C145SW16TF operate across the -25°C ~ 75°C temperature range.