OPB981N55Z Equivalent & Substitute Parts

Part Overview

The OPB981N55Z is a through-beam optical sensor module manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This component features a 0.125" (3.18mm) sensing distance with NPN open collector buffer output configuration, designed for chassis mount applications with wire leads. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system integration.

Substiute Parts

OPB981N55Z

TT Electronics/Optek TechnologyIn Stock: 1128OPB981N55Z Datasheet

Current PartRFQ

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

OPB981T55Z

TT Electronics/Optek TechnologyIn Stock: 986OPB981T55Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPB981N55Z 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: Chassis Mount
• Current - Supply: 15 mA
• Voltage - Supply: 4.75V ~ 5.25V
• Response Time: 70ns
• Operating Temperature: -40°C ~ 70°C
• Package / Case: Module, Wire Leads
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

All substitute parts listed maintain identical values across these parameters. Substitutes are drawn from the OPB931 and OPB941 base product families within the Photologic® series, all manufactured by TT Electronics/Optek Technology. The primary distinction between substitute options lies in product status (active versus obsolete) and inventory availability.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical equivalence to the OPB981N55Z. Selection among active alternatives should prioritize parts with active product status, as these ensure continued manufacturer support and supply chain availability. All substitute candidates carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

For applications requiring immediate availability, OPB941W51Z offers the highest inventory level at 6965 units. For applications within the OPB981 base product family, OPB981T51Z and OPB981L51Z provide active status with substantial inventory (1475 and 1793 units respectively). OPB931W55Z and OPB931W51Z represent alternatives from the OPB931 base product family, both active with comparable inventory levels.

Frequently Asked Questions (FAQ)

Q: Can OPB981N55Z be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical electrical specifications (15 mA supply current, 4.75V–5.25V supply voltage, 70ns response time), mechanical configuration (chassis mount, module with wire leads), sensing characteristics (0.125" through-beam), and output type (NPN open collector buffer). Direct substitution is electrically and mechanically valid.

Q: What is the primary reason for seeking substitutes for OPB981N55Z?

A: The OPB981N55Z is classified as obsolete. Substitute parts from the OPB931 and OPB941 families, as well as alternative variants within the OPB981 family, maintain active product status and ensure continued availability and manufacturer support.

Q: Are there differences in packaging between the main part and substitutes?

A: All parts listed share identical package configuration: Module, Wire Leads with chassis mount design. No packaging modifications are required for substitution.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the OPB981N55Z.

Q: What distinguishes the OPB931, OPB941, and OPB981 base product families?

A: The provided data specifies only the parameters listed in this document. All three families maintain identical electrical and mechanical specifications for the parts listed. Selection among families should be based on inventory availability and product status (active versus obsolete).

Q: Is the 70ns response time maintained across all substitutes?

A: Yes. All substitute parts operate at 70ns response time, identical to the OPB981N55Z.

Q: What is the operating temperature range for these optical sensors?

A: All parts operate across -40°C to 70°C, providing equivalent thermal performance for the OPB981N55Z replacement.