RPI-0128T81 Equivalent & Substitute Parts

Part Overview

The RPI-0128T81 is an optical sensor manufactured by Rohm Semiconductor, classified as a through-beam phototransistor slotted module with a sensing distance of 0.047" (1.2mm). This surface-mount component features unamplified phototransistor output and is designed for applications requiring slot-based optical detection.

The RPI-0128T81 carries a product status of "Not For New Designs," indicating it has been discontinued or superseded. For new development projects, identifying functionally equivalent alternatives is necessary to ensure design continuity and long-term component availability.

Substiute Parts

RPI-0128T81

Rohm SemiconductorIn Stock: 3145RPI-0128T81 Datasheet

Current PartRFQ

RPI-0128

Rohm SemiconductorIn Stock: 55705RPI-0128 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RPI-0128T81 is determined by strict parametric matching across the following critical criteria:

• Sensing distance: 0.047" (1.2mm)
• Sensing method: Through-beam optical detection
• Output type: Phototransistor
• Maximum collector current: 30 mA
• Maximum collector-emitter breakdown voltage: 30 V
• Response time: 10µs
• Operating temperature range: -25°C ~ 85°C
• Mounting configuration: Surface mount
• Package form: Slotted module
• Signal amplification: Unamplified

The RPI-0128 qualifies as a parametric equivalent to the RPI-0128T81, matching all electrical and mechanical specifications while offering improved product status and availability.

Parameter Comparison

Engineering Selection Recommendations

The RPI-0128 is the direct substitute for the RPI-0128T81. Both components are manufactured by Rohm Semiconductor and share identical electrical and mechanical specifications. The primary distinction is product lifecycle status: the RPI-0128T81 is designated "Not For New Designs," while the RPI-0128 maintains "Active" status.

For new designs and production applications, the RPI-0128 is the appropriate selection. Both parts maintain ROHS3 compliance and are unaffected by REACH regulations. The RPI-0128 offers significantly higher inventory availability (55,630 units versus 3,100 units), supporting sustained production requirements.

Frequently Asked Questions (FAQ)

Q: Can the RPI-0128 directly replace the RPI-0128T81 in existing designs?

A: Yes. The RPI-0128 and RPI-0128T81 are parametrically identical across all electrical and mechanical specifications, including sensing distance, output type, current ratings, voltage ratings, response time, operating temperature range, and package configuration. Direct substitution is supported without circuit modification.

Q: Why is the RPI-0128T81 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status within Rohm Semiconductor's product portfolio. The RPI-0128 serves as the active replacement, maintaining full functional equivalence while ensuring ongoing availability and support.

Q: Are there differences in moisture sensitivity between these parts?

A: The RPI-0128T81 specifies MSL 1 (Unlimited), while the RPI-0128 specifies MSL 5 (48 Hours). Both ratings are within acceptable ranges for surface-mount optical sensor applications. Component handling procedures should follow the more restrictive MSL 5 specification when both parts are used in the same production environment.

Q: What is the sensing distance specification, and does it affect substitution?

A: Both parts feature a sensing distance of 0.047" (1.2mm) with through-beam detection method. This specification is identical between the main part and substitute, confirming mechanical and optical compatibility in slot-based detection applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the RPI-0128T81 and RPI-0128 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.