RPI-579 Equivalent & Substitute Parts

Part Overview

The RPI-579 is an optical sensor manufactured by Rohm Semiconductor, classified as a through-beam phototransistor with PCB mount configuration. This component features a 0.197" (5mm) sensing distance and is designed for applications requiring slot-type optical detection. The RPI-579 is currently listed as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. Active alternatives with equivalent electrical and mechanical specifications are available to maintain design continuity.

Substiute Parts

RPI-579

Rohm SemiconductorIn Stock: 55880RPI-579 Datasheet

Current PartRFQ

RPI-441C1

Rohm SemiconductorIn Stock: 181784RPI-441C1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RPI-579 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Equivalence Criteria:

• Output Configuration: Phototransistor
• Current - DC Forward (If) (Max): 50 mA
• Current - Collector (Ic) (Max): 30 mA
• Voltage - Collector Emitter Breakdown (Max): 30 V
• Response Time: 10µs
• Operating Temperature: -25°C ~ 85°C
• Type: Unamplified

Mechanical Compatibility Criteria:

• Sensing Method: Through-Beam
• Mounting Type: Through Hole
• Package / Case: PCB Mount
• Manufacturer: Rohm Semiconductor

Regulatory & Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

The RPI-441C1 qualifies as a direct substitute despite a reduced sensing distance of 0.157" (4mm) versus the original 0.197" (5mm), as all electrical parameters, mounting configuration, and regulatory compliance specifications remain identical. The RPI-441C1 maintains active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The RPI-441C1 is the qualified substitute for the obsolete RPI-579. Selection of this alternative is supported by:

Product Status: The RPI-441C1 maintains active product status with Rohm Semiconductor, ensuring availability and supply chain stability compared to the obsolete RPI-579.

Electrical Compatibility: All critical electrical parameters are identical between the two components, including maximum forward current (50 mA), collector current (30 mA), collector-emitter breakdown voltage (30 V), and response time (10µs). Operating temperature range remains -25°C to 85°C for both parts.

Mechanical Compatibility: Both components utilize through-hole mounting with PCB mount configuration, maintaining identical form factor and board integration requirements.

Regulatory Compliance: The RPI-441C1 maintains full ROHS3 compliance, REACH unaffected status, and MSL 1 rating, matching the compliance profile of the original RPI-579.

Design Consideration: The sensing distance reduction from 0.197" (5mm) to 0.157" (4mm) represents the only specification variance. This parameter difference must be evaluated within the context of the specific application's optical path and slot geometry requirements.

Frequently Asked Questions (FAQ)

Q: Can the RPI-441C1 be used as a direct replacement for the RPI-579 in existing designs?

A: The RPI-441C1 is electrically and mechanically compatible with the RPI-579 for through-hole PCB mount applications. The primary design consideration is the reduced sensing distance (4mm versus 5mm). If the application's optical slot geometry accommodates the shorter sensing distance, the RPI-441C1 functions as a direct substitute.

Q: What is the significance of the sensing distance difference between these parts?

A: Sensing distance defines the maximum gap between the emitter and receiver in a through-beam optical sensor configuration. The RPI-579 operates at 0.197" (5mm) while the RPI-441C1 operates at 0.157" (4mm). Applications with slot widths or optical paths designed for the 5mm distance must be physically evaluated to confirm compatibility with the 4mm specification.

Q: Are there any differences in electrical performance between the RPI-579 and RPI-441C1?

A: No. Both components share identical electrical specifications: 50 mA maximum forward current, 30 mA maximum collector current, 30 V collector-emitter breakdown voltage, and 10µs response time. Operating temperature range is identical at -25°C to 85°C.

Q: What is the packaging difference between these parts?

A: The RPI-579 is supplied in standard packaging, while the RPI-441C1 is supplied in bulk packaging. Both maintain identical PCB mount through-hole configuration and form factor.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the RPI-579 and RPI-441C1 are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating, meeting current regulatory requirements for electronic component procurement.

Q: Why is the RPI-579 listed as obsolete?

A: The RPI-579 has been discontinued by Rohm Semiconductor. The RPI-441C1 represents the active product line continuation with equivalent electrical and mechanical specifications, ensuring ongoing availability for new designs and system support.