OPB981T55 Equivalent & Substitute Parts

Part Overview

The OPB981T55 is an optical sensor from TT Electronics/Optek Technology's Photologic® series, designed as a through-beam sensor with 0.125" (3.18mm) sensing distance and wire lead module packaging. This part operates with NPN open collector buffer output configuration and is classified as obsolete. Due to its obsolete status, equivalent active production alternatives from the same manufacturer are available to maintain system compatibility and ensure continued supply chain access.

Substiute Parts

OPB981T55

TT Electronics/Optek TechnologyIn Stock: 807OPB981T55 Datasheet

Current PartRFQ

OPB981T55Z

TT Electronics/Optek TechnologyIn Stock: 986OPB981T55Z Datasheet

DirectRFQ

OPB931W51Z

TT Electronics/Optek TechnologyIn Stock: 1143OPB931W51Z Datasheet

MFR RecommendedRFQ

OPB931W55Z

TT Electronics/Optek TechnologyIn Stock: 1501OPB931W55Z Datasheet

MFR RecommendedRFQ

OPB941W51Z

TT Electronics/Optek TechnologyIn Stock: 6980OPB941W51Z Datasheet

MFR RecommendedRFQ

OPB941W55Z

TT Electronics/Optek TechnologyIn Stock: 792OPB941W55Z Datasheet

MFR RecommendedRFQ

OPB981L11Z

TT Electronics/Optek TechnologyIn Stock: 1234OPB981L11Z Datasheet

MFR RecommendedRFQ

OPB981L51Z

TT Electronics/Optek TechnologyIn Stock: 1884OPB981L51Z Datasheet

MFR RecommendedRFQ

OPB981L55Z

TT Electronics/Optek TechnologyIn Stock: 661OPB981L55Z Datasheet

MFR RecommendedRFQ

OPB981P11Z

TT Electronics/Optek TechnologyIn Stock: 1132OPB981P11Z Datasheet

MFR RecommendedRFQ

OPB981T11Z

TT Electronics/Optek TechnologyIn Stock: 850OPB981T11Z Datasheet

MFR RecommendedRFQ

OPB981T51Z

TT Electronics/Optek TechnologyIn Stock: 1556OPB981T51Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPB981T55 is determined by strict equivalence across the following parameters: sensing distance (0.125" / 3.18mm), sensing method (through-beam), output configuration (NPN open collector buffer), mounting type (chassis mount), supply current (15 mA), supply voltage range (4.75V ~ 5.25V), response time (70ns), operating temperature range (-40°C ~ 70°C), and package type (module with wire leads).

All substitute parts listed maintain identical electrical and mechanical specifications across these criteria. The primary distinction between the OPB981T55 and its active equivalents is product status: the OPB981T55 is obsolete, while all substitute parts are in active production. Additionally, substitute parts carry ROHS3 compliance certification, whereas the original part is RoHS non-compliant.

Parameter Comparison

Engineering Selection Recommendations

For new designs or component replacement, OPB981T55Z is the direct equivalent, offering identical electrical and mechanical performance with active production status and ROHS3 compliance. This part maintains the same base product number (OPB981) and represents the current production variant of the obsolete OPB981T55.

Alternative active substitutes from the OPB931 and OPB941 base product families are functionally equivalent across all specified electrical and mechanical parameters. These alternatives provide additional supply chain flexibility and inventory availability. All substitute parts carry ROHS3 compliance certification, meeting current regulatory requirements for electronic component procurement.

Selection between substitute options should be based on availability, lead time, and inventory levels rather than electrical or mechanical differentiation, as all listed parts are electrically and mechanically interchangeable within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can OPB981T55 be directly replaced with OPB981T55Z? A: Yes. OPB981T55Z is the active production equivalent of the obsolete OPB981T55, maintaining identical electrical specifications, sensing distance, output configuration, and package type. The primary difference is product status and RoHS compliance level.

Q: Are OPB931 and OPB941 series parts compatible with OPB981T55? A: Yes. OPB931W51Z, OPB931W55Z, OPB941W51Z, and OPB941W55Z are functionally equivalent substitutes. All parts share identical sensing distance (0.125" / 3.18mm), 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), and package type (module with wire leads).

Q: What is the difference between OPB981T55 and OPB981T55Z? A: The OPB981T55 is obsolete and RoHS non-compliant. The OPB981T55Z is the active production variant with ROHS3 compliance. Electrical and mechanical specifications are identical.

Q: Are there packaging differences between substitute parts? A: All substitute parts are supplied in bulk packaging with module wire lead configuration. The OPB981T55 original part had unspecified packaging; all active substitutes use standardized bulk packaging suitable for production environments.

Q: Which substitute part has the highest inventory availability? A: OPB941W51Z has the highest inventory level at 6965 pieces, followed by OPB931W55Z at 1456 pieces. Inventory levels should be confirmed with the supplier for current availability.