RPI-579N1E Equivalent & Substitute Parts

Part Overview

The RPI-579N1E is an optical sensor manufactured by Rohm Semiconductor, designed as a through-beam phototransistor with PCB mount configuration. This component features a 0.197" (5mm) sensing distance and unamplified output, suitable for slot detection applications. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

RPI-579N1E

Rohm SemiconductorIn Stock: 941RPI-579N1E Datasheet

Current PartRFQ

RPI-441C1

Rohm SemiconductorIn Stock: 181784RPI-441C1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RPI-579N1E is determined by strict equivalence across the following critical parameters:

• Sensing Method: Through-Beam configuration
• Output Configuration: Phototransistor (unamplified)
• Mounting Type: Through Hole, PCB Mount
• Electrical Ratings: Collector current (30 mA max), collector-emitter breakdown voltage (30 V max), response time (10µs)
• Operating Temperature: -25°C ~ 85°C range
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The RPI-441C1 qualifies as a direct substitute based on matching electrical characteristics, sensing method, mounting configuration, and compliance certifications. The primary design difference is the reduced sensing distance (0.157" / 4mm versus 0.197" / 5mm), which represents a minor mechanical variation within the through-beam phototransistor product family.

Parameter Comparison

Engineering Selection Recommendations

The RPI-441C1 is the qualified substitute for the obsolete RPI-579N1E. Both components maintain identical electrical performance specifications, including collector current rating (30 mA max), breakdown voltage (30 V max), and response time (10µs). Both are ROHS3 compliant and REACH unaffected, ensuring regulatory alignment for new designs and legacy system support.

The RPI-441C1 offers the additional advantage of active product status with significantly higher inventory availability (181,741 units in stock versus 866 units for the RPI-579N1E), supporting both immediate procurement needs and long-term supply chain continuity.

The sensing distance difference (0.157" / 4mm for RPI-441C1 versus 0.197" / 5mm for RPI-579N1E) represents a mechanical design variation. System integration must account for this reduced sensing distance in slot width and component positioning calculations.

Frequently Asked Questions (FAQ)

Q: Can the RPI-441C1 directly replace the RPI-579N1E in existing designs?

A: The RPI-441C1 provides electrical and functional equivalence as a through-beam phototransistor with matching current ratings, voltage ratings, and response time. The reduced sensing distance (4mm versus 5mm) requires mechanical design verification to confirm slot width and component spacing compatibility.

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

A: The RPI-441C1 features a 0.157" (4mm) sensing distance compared to the RPI-579N1E's 0.197" (5mm) sensing distance. All other electrical parameters, mounting configuration, and compliance certifications are identical.

Q: Why is the RPI-579N1E obsolete?

A: The RPI-579N1E is listed as obsolete by the manufacturer. The RPI-441C1 represents the active product line continuation within the Rohm Semiconductor through-beam phototransistor portfolio.

Q: Are there any compliance or regulatory differences?

A: Both the RPI-579N1E and RPI-441C1 are ROHS3 compliant and REACH unaffected. No regulatory differences exist between these components.

Q: What packaging options are available for the RPI-441C1?

A: The RPI-441C1 is supplied in bulk packaging, consistent with standard optical sensor distribution for PCB mount through-hole components.