RPI-124F Equivalent & Substitute Parts

Part Overview

The RPI-124F is an optical sensor manufactured by Rohm Semiconductor, classified as a through-beam phototransistor designed for PCB mounting applications. This component operates with a 0.039" (1mm) sensing distance and delivers unamplified output via phototransistor configuration. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional interchangeability in circuit applications.

Substiute Parts

RPI-124F

Rohm SemiconductorIn Stock: 1043RPI-124F Datasheet

Current PartRFQ

RPI-121

Rohm SemiconductorIn Stock: 45599RPI-121 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RPI-124F are identified based on strict equivalence across the following critical parameters:

• Sensing Distance: 0.039" (1mm)
• Sensing Method: Through-Beam
• 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, 10µs
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: PCB Mount
• Type: Unamplified

The RPI-121 meets all specified electrical and mechanical parameters, establishing it as a parametric equivalent. Both components share identical sensing characteristics, current ratings, voltage specifications, and thermal operating range. Packaging differences (Bulk for RPI-121 versus standard for RPI-124F) do not affect functional compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both RPI-124F and RPI-121 maintain Active product status with full RoHS3 compliance and REACH unaffected certification. Selection between these components is determined by packaging and inventory requirements rather than functional performance. The RPI-121 offers significantly higher inventory availability (45,554 Pcs) compared to RPI-124F (974 Pcs), making it suitable for high-volume production requirements. Both components satisfy identical electrical specifications, thermal operating ranges, and mechanical mounting requirements for through-beam optical sensing applications.

Frequently Asked Questions (FAQ)

Q: Can RPI-121 replace RPI-124F in existing circuit designs?

A: Yes. Both components share identical electrical parameters, sensing characteristics, and mounting specifications. Direct substitution is functionally compatible without circuit modification.

Q: What is the primary difference between RPI-124F and RPI-121?

A: The primary difference is packaging format. RPI-121 is supplied in Bulk packaging, while RPI-124F uses standard packaging. Electrical and mechanical specifications are identical.

Q: Are both parts RoHS compliant?

A: Yes. Both RPI-124F and RPI-121 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What sensing distance do these components operate at?

A: Both components operate at 0.039" (1mm) sensing distance using through-beam sensing methodology.

Q: What is the maximum collector current rating?

A: Both RPI-124F and RPI-121 have a maximum collector current (Ic) rating of 30 mA.

Q: What operating temperature range is supported?

A: Both components operate across -25°C to 85°C temperature range.

Q: Are these components amplified or unamplified?

A: Both are unamplified phototransistor sensors, providing direct output without integrated signal amplification.