RPI-0126K Equivalent & Substitute Parts

Part Overview

The RPI-0126K is an optical sensor manufactured by Rohm Semiconductor, designed as a through-beam phototransistor with a 0.047" (1.2mm) sensing distance in a 4-SMD surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The sensor operates as an unamplified optical detector suitable for slot-type sensing applications.

Substiute Parts

RPI-0126K

Rohm SemiconductorIn Stock: 4819RPI-0126K Datasheet

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RPI-0125

Rohm SemiconductorIn Stock: 55640RPI-0125 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RPI-0126K is determined by matching the following critical parameters:

• Sensing distance: 0.047" (1.2mm)
• Sensing method: Through-beam
• Output configuration: Phototransistor
• Current - Collector (Ic) Max: 30 mA
• Voltage - Collector Emitter Breakdown (Max): 30 V
• Response time: 10µs
• Type: Unamplified
• RoHS compliance: ROHS3 Compliant

The RPI-0125 meets all electrical and functional specifications required for direct substitution. While the RPI-0125 uses a slotted module package instead of 4-SMD, it maintains identical electrical performance and sensing characteristics, making it functionally equivalent for applications where mechanical form factor can be accommodated.

Parameter Comparison

Engineering Selection Recommendations

The RPI-0125 is the qualified substitute for the obsolete RPI-0126K. Both components are manufactured by Rohm Semiconductor and maintain identical electrical specifications across all critical parameters: sensing distance, collector current maximum, breakdown voltage, and response time. The RPI-0125 carries active product status with current manufacturing support, ensuring supply chain continuity.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and production. The primary design consideration is the package transition from 4-SMD to slotted module format, which requires mechanical layout evaluation but does not affect electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can RPI-0125 directly replace RPI-0126K in existing PCB designs?

A: Electrical substitution is complete. The RPI-0125 maintains all electrical specifications. However, the package change from 4-SMD to slotted module requires mechanical redesign of the mounting interface and PCB layout.

Q: What are the key differences between these parts?

A: The primary difference is packaging: RPI-0126K uses 4-SMD surface mount, while RPI-0125 uses a slotted module form factor. All electrical parameters, sensing characteristics, and compliance certifications are identical.

Q: Is the RPI-0125 suitable for high-temperature applications?

A: The RPI-0125 operates across -25°C to 85°C, compared to RPI-0126K at -30°C to 85°C. For applications requiring operation below -25°C, the RPI-0126K specification is more suitable, though the part is obsolete.

Q: Are both parts RoHS compliant?

A: Yes. Both RPI-0126K and RPI-0125 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the moisture sensitivity level difference?

A: RPI-0126K has MSL 1 (unlimited), while RPI-0125 has MSL 5 (48 hours). This affects storage and handling requirements for the substitute part.