RPI-579N1 Equivalent & Substitute Parts

Part Overview

The RPI-579N1 is an optical sensor manufactured by Rohm Semiconductor, designed as a through-beam phototransistor with PCB mount configuration. This component operates with a 0.197" (5mm) sensing distance and provides unamplified output suitable for slot detection applications. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Substiute Parts

RPI-579N1

Rohm SemiconductorIn Stock: 2313RPI-579N1 Datasheet

Current PartRFQ

RPI-441C1

Rohm SemiconductorIn Stock: 181784RPI-441C1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RPI-579N1 is determined by the following critical parameters:

• Sensing Method: Through-Beam operation must be maintained
• Output Configuration: Phototransistor output type required
• Electrical Characteristics: Maximum collector current (30 mA), collector-emitter breakdown voltage (30 V), and response time (10µs) must be met or exceeded
• Mounting Type: Through Hole PCB Mount configuration
• Operating Temperature Range: -25°C ~ 85°C compatibility
• Compliance Standards: ROHS3 compliance and MSL Level 1 required

The RPI-441C1 qualifies as a direct substitute based on these parameters. While the sensing distance differs (0.157" vs 0.197"), all critical electrical, mechanical, and compliance specifications align with the original component requirements.

Parameter Comparison

Engineering Selection Recommendations

The RPI-441C1 is the qualified substitute for the obsolete RPI-579N1. Both components maintain identical electrical performance specifications, operating temperature ranges, and compliance certifications. The RPI-441C1 carries Active product status with significantly higher inventory availability (181,741 units), ensuring supply chain continuity.

The primary design consideration is the sensing distance differential: the RPI-441C1 operates at 0.157" (4mm) compared to the RPI-579N1 at 0.197" (5mm). This 1mm reduction in sensing distance must be evaluated within the context of the specific application's slot width and optical path requirements. All other mechanical and electrical parameters remain equivalent, supporting direct functional substitution in through-beam detection circuits.

Frequently Asked Questions (FAQ)

Q: Can the RPI-441C1 directly replace the RPI-579N1 in existing designs?

A: The RPI-441C1 provides electrical and mechanical compatibility with identical collector current ratings, breakdown voltage, response time, and operating temperature specifications. The sensing distance reduction from 5mm to 4mm must be evaluated for the specific application geometry.

Q: What is the significance of the product status change from Obsolete to Active?

A: The RPI-441C1 is in active production with full manufacturer support and substantially higher inventory levels. This ensures long-term component availability and supply chain reliability compared to the obsolete RPI-579N1.

Q: Are there compliance differences between these parts?

A: Both the RPI-579N1 and RPI-441C1 maintain ROHS3 compliance, MSL Level 1 rating, and REACH Unaffected status. Compliance certifications are equivalent across both components.

Q: How does the packaging differ between these parts?

A: Both components feature Through Hole PCB Mount configuration. The RPI-441C1 is supplied in Bulk packaging, while the RPI-579N1 packaging specification was not provided. The mounting interface and footprint remain compatible.

Q: What electrical parameters determine substitution eligibility?

A: Critical parameters include maximum collector current (30 mA), collector-emitter breakdown voltage (30 V), response time (10µs), and operating temperature range (-25°C ~ 85°C). The RPI-441C1 meets or exceeds all these specifications.