RPI-578NF Equivalent & Substitute Parts

Part Overview

The RPI-578NF is a through-beam optical sensor manufactured by Rohm Semiconductor, designed for PCB mount applications with phototransistor output configuration. This component operates at 50V with an 80mW power rating and provides 0.197" (5mm) sensing distance capability. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

RPI-578NF

Rohm SemiconductorIn Stock: 55877RPI-578NF Datasheet

Current PartRFQ

RPI-441C1

Rohm SemiconductorIn Stock: 181784RPI-441C1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RPI-578NF is determined by electrical and mechanical parameter compatibility within the optical sensor category. The primary substitute, RPI-441C1, maintains functional equivalence through matching of critical parameters: identical phototransistor output configuration, through-beam sensing method, matching maximum collector current (30 mA), matching maximum forward current (50 mA), identical collector-emitter breakdown voltage (30 V), and matching response time (10µs). Both components operate across the same temperature range (-25°C ~ 85°C), utilize through-hole mounting on PCB, and maintain identical RoHS3 compliance and MSL ratings.

The key differentiator between RPI-578NF and RPI-441C1 is the sensing distance specification: RPI-578NF provides 0.197" (5mm) while RPI-441C1 provides 0.157" (4mm). This represents a mechanical and optical design difference that must be evaluated against application requirements. Both components are unamplified optical sensors suitable for direct PCB integration.

Parameter Comparison

Engineering Selection Recommendations

The RPI-441C1 serves as the primary substitute for the obsolete RPI-578NF based on electrical parameter equivalence and active product status. Both components maintain identical electrical specifications for collector current, forward current, breakdown voltage, and response time, ensuring functional compatibility in circuit design.

The transition from RPI-578NF to RPI-441C1 requires evaluation of the sensing distance differential. The RPI-578NF operates at 0.197" (5mm) while RPI-441C1 operates at 0.157" (4mm). This 0.040" (1mm) reduction in sensing distance must be assessed against application-specific gap and alignment tolerances. Systems designed with the larger sensing distance of RPI-578NF may require mechanical redesign or optical path adjustment to accommodate the reduced sensing distance of RPI-441C1.

Both components maintain ROHS3 compliance and identical moisture sensitivity ratings, supporting direct substitution from a regulatory and environmental standpoint. The active product status of RPI-441C1 ensures ongoing availability and supply chain continuity compared to the obsolete RPI-578NF.

Frequently Asked Questions (FAQ)

Q: Can RPI-441C1 directly replace RPI-578NF without circuit modification?

A: Electrical parameters are identical, supporting direct circuit-level substitution. However, the 0.040" (1mm) reduction in sensing distance requires mechanical evaluation of the application's gap tolerance and optical path design.

Q: What is the primary difference between these two optical sensors?

A: Both components share identical electrical specifications (current ratings, voltage ratings, response time, and temperature range). The primary difference is sensing distance: RPI-578NF provides 0.197" (5mm) while RPI-441C1 provides 0.157" (4mm).

Q: Are both components RoHS compliant?

A: Yes, both RPI-578NF and RPI-441C1 are ROHS3 compliant with identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: Why is RPI-578NF listed as obsolete?

A: RPI-578NF carries obsolete product status. RPI-441C1 is the active equivalent from Rohm Semiconductor for through-beam phototransistor optical sensing applications.

Q: What mounting considerations apply to both components?

A: Both components utilize through-hole mounting on PCB with identical package/case specifications (PCB Mount), supporting equivalent mechanical integration.

Q: Are there any compliance or certification differences?

A: Both components maintain identical RoHS3 compliance status, REACH unaffected status, and MSL ratings, supporting equivalent use in regulated applications.