OPB971P51 Equivalent & Substitute Parts

Part Overview

The OPB971P51 is a through-beam optical sensor from TT Electronics/Optek Technology's Photologic® series, designed for 0.125" (3.18mm) PCB mount applications. This part operates with NPN open collector buffer output configuration and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from the active product line are available to maintain design continuity and ensure supply chain reliability.

Substiute Parts

OPB971P51

TT Electronics/Optek TechnologyIn Stock: 1216OPB971P51 Datasheet

Current PartRFQ

OPB961N11

TT Electronics / Optek TechnologyIn Stock: 814OPB961N11 Datasheet

MFR RecommendedRFQ

OPB961N51

TT Electronics/Optek TechnologyIn Stock: 3865OPB961N51 Datasheet

MFR RecommendedRFQ

OPB961N55

TT Electronics / Optek TechnologyIn Stock: 2331OPB961N55 Datasheet

MFR RecommendedRFQ

OPB961T51

TT Electronics/Optek TechnologyIn Stock: 20180OPB961T51 Datasheet

MFR RecommendedRFQ

OPB971N11

TT Electronics / Optek TechnologyIn Stock: 817OPB971N11 Datasheet

MFR RecommendedRFQ

OPB971N51

TT Electronics/Optek TechnologyIn Stock: 3220OPB971N51 Datasheet

MFR RecommendedRFQ

OPB971T11

TT Electronics/Optek TechnologyIn Stock: 1084OPB971T11 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPB971P51 is determined by strict equivalence across the following critical parameters:

• Sensing Distance: 0.125" (3.18mm)
• Sensing Method: Through-Beam
• Output Configuration: NPN - Open Collector, Buffer
• Mounting Type: Through Hole
• Current - Supply: 15 mA
• Voltage - Supply: 4.75V ~ 5.25V
• Response Time: 70ns
• Operating Temperature: -40°C ~ 70°C
• Package / Case: PCB Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes are drawn from the OPB961 and OPB971 base product families, with variations in packaging designation (N or T suffix) and product status (Active vs. Obsolete).

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain full electrical and mechanical compatibility with the OPB971P51. Selection among available substitutes should be based on the following factors:

Product Status: All substitute parts are classified as Active, ensuring ongoing availability and manufacturing support compared to the obsolete OPB971P51.

Compliance: All substitute parts carry identical ROHS3 compliance and REACH Unaffected status, meeting the same regulatory requirements as the original part.

Inventory Availability: OPB961T51 offers the highest inventory level at 20,099 units, followed by OPB961N51 at 3,807 units and OPB971N51 at 3,200 units. Lower inventory levels are available for OPB961N55, OPB971N11, OPB961N11, and OPB971T11.

Base Product Family: OPB961 and OPB971 families are functionally equivalent within the Photologic® series. Selection between families does not affect electrical performance or mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can OPB961 series parts directly replace OPB971P51?

A: Yes. OPB961N11, OPB961N51, OPB961N55, and OPB961T51 are electrically and mechanically equivalent to OPB971P51 across all critical parameters including sensing distance, output configuration, supply voltage, response time, and operating temperature range.

Q: What is the difference between N and T packaging designations?

A: The N and T suffixes indicate packaging format variations. Both maintain identical electrical specifications and PCB mount mechanical compatibility. Selection between N and T variants depends on procurement and handling requirements specific to your supply chain.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification and REACH Unaffected status, matching the regulatory profile of the original OPB971P51.

Q: Which substitute part has the best availability?

A: OPB961T51 provides the highest inventory level at 20,099 units in stock, making it the most readily available option for immediate procurement.

Q: Will substituting OPB971P51 with an active product affect my design?

A: No. All substitute parts maintain identical electrical and mechanical specifications. The transition from an obsolete to an active product ensures continued manufacturing support and supply chain stability without design modifications.

Q: Can I mix different substitute part numbers in the same assembly?

A: Yes. All substitute parts are functionally equivalent and can be used interchangeably within the same design without performance degradation.