OPB971L55 Equivalent & Substitute Parts

Part Overview

The OPB971L55 is a through-beam optical sensor manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This 3.18mm PCB mount sensor is designed for applications requiring precise object detection through optical sensing with NPN open collector output configuration. The OPB971L55 is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Active alternatives within the same product family maintain identical electrical and mechanical specifications, ensuring direct functional compatibility.

Substiute Parts

OPB971L55

TT Electronics/Optek TechnologyIn Stock: 867OPB971L55 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 OPB971L55 is determined by strict equivalence across all critical electrical and mechanical parameters. All substitute parts maintain identical specifications for sensing distance (0.125"), sensing method (through-beam), output configuration (NPN open collector buffer), supply voltage (4.75V ~ 5.25V), supply current (15 mA), response time (70ns), operating temperature range (-40°C ~ 70°C), mounting type (through hole PCB mount), and environmental compliance (ROHS3, REACH unaffected, MSL 1).

The substitute parts are grouped into two base product families: OPB961 series and OPB971 series. Within each family, variants are differentiated by packaging designation (N or T suffix) and lead configuration (11, 51, or 55 suffix). These designations reflect packaging and lead frame variations that do not alter electrical performance or functional compatibility. All listed substitutes are active products with current manufacturing status, providing supply continuity for the obsolete OPB971L55.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are manufactured by TT Electronics/Optek Technology and maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the original OPB971L55. The primary distinction among substitutes is product status: all alternatives are active products with ongoing manufacturing support, eliminating supply discontinuity risk associated with the obsolete OPB971L55.

Selection among substitute parts should be based on packaging designation and lead configuration requirements specific to the application circuit board design. The OPB961 series and OPB971 series are functionally equivalent; selection between families depends on PCB layout compatibility and mechanical fit requirements. Inventory availability varies across part numbers, with OPB961T51 offering the highest stock level (20,099 units), followed by OPB961N51 (3,807 units) and OPB971N51 (3,200 units).

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically identical to the OPB971L55?

A: Yes. All substitute parts maintain identical electrical specifications including 4.75V ~ 5.25V supply voltage, 15 mA supply current, 70ns response time, NPN open collector buffer output configuration, and -40°C ~ 70°C operating temperature range.

Q: What is the difference between OPB961 and OPB971 series substitutes?

A: Both series are functionally equivalent through-beam optical sensors with identical electrical and mechanical parameters. The series designation reflects internal design variations that do not affect electrical performance or circuit compatibility.

Q: What do the suffix designations (N11, N51, N55, T51, T11) indicate?

A: Suffix designations identify packaging type and lead frame configuration. These variations do not alter electrical specifications or functional performance. Selection should be based on PCB layout requirements and mechanical fit constraints.

Q: Is the OPB971L55 directly pin-compatible with all substitute parts?

A: All substitute parts share identical through-hole PCB mount configuration, supply voltage, supply current, output configuration, and sensing specifications. Physical lead spacing and package dimensions must be verified against specific PCB design requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original OPB971L55.

Q: Which substitute part offers the best supply availability?

A: OPB961T51 provides the highest current inventory at 20,099 units, followed by OPB961N51 at 3,807 units. Both are active products with ongoing manufacturing support.