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OPB981P55 Equivalent & Substitute Parts
Part Overview
The OPB981P55 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 connections. This component 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 series are available to maintain design continuity and ensure supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Sensing Distance | 0.125" (3.18mm) |
| Sensing Method | Through-Beam |
| Output Configuration | NPN - Open Collector, Buffer |
| Voltage Supply | 4.75V ~ 5.25V |
| Current Supply | 15 mA |
| Response Time | 70ns |
| Operating Temperature | -40°C ~ 70°C |
| Mounting Type | Chassis Mount |
| Package / Case | Module, Wire Leads |
| Series | Photologic® |
Substitute Part Grouping Explanation
Substitution of the OPB981P55 is determined by electrical and mechanical parameter equivalence across the Photologic® optical sensor series. All substitute parts maintain identical specifications for sensing distance, sensing method, output configuration, supply voltage range, supply current, response time, operating temperature range, mounting type, and package configuration. The substitute parts are organized within two base product families: OPB931 and OPB941, with OPB981 variants also available. Substitution is valid when all critical parameters—sensing distance (0.125"), sensing method (through-beam), output type (NPN open collector buffer), voltage range (4.75V–5.25V), current draw (15 mA), response time (70ns), temperature range (-40°C to 70°C), and physical packaging (module with wire leads)—remain constant across part selections.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Sensing Distance | Sensing Method | Output Configuration | Voltage Supply | Current Supply | Response Time | Operating Temperature | Package / Case | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| OPB981P55 | TT Electronics/Optek Technology | Obsolete | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | RoHS non-compliant |
| OPB931W51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB931W55Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB941W51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB941W55Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB981L11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB981L51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB981L55Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB981P11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB981T11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
| OPB981T51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 4.75V ~ 5.25V | 15 mA | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant |
Engineering Selection Recommendations
The OPB981P55 is classified as obsolete and carries RoHS non-compliant status. All listed substitute parts are active production components with ROHS3 compliance certification, ensuring alignment with current regulatory requirements and supply chain continuity. Selection among the substitute parts should be based on product availability and inventory levels. The OPB941W51Z offers the highest inventory availability at 6965 units, followed by OPB981T51Z at 1475 units and OPB931W55Z at 1456 units. All substitute parts maintain electrical and mechanical equivalence to the original OPB981P55, supporting direct replacement in existing circuit designs without modification to PCB layouts or firmware configurations.
Frequently Asked Questions (FAQ)
Q: Can OPB981P55 be directly replaced with any of the listed substitute parts? A: Yes. All substitute parts maintain identical electrical specifications (4.75V–5.25V supply, 15 mA current, 70ns response time, NPN open collector buffer output) and mechanical packaging (0.125" through-beam sensing distance, chassis mount, module with wire leads). Direct substitution is electrically and mechanically valid.
Q: What is the primary reason to transition from OPB981P55 to an active substitute? A: The OPB981P55 is obsolete and RoHS non-compliant. Active substitute parts carry ROHS3 compliance certification, ensuring regulatory compliance and long-term supply availability.
Q: Are there differences in sensing performance between the OPB981P55 and substitute parts? A: No. All parts share identical sensing distance (0.125"), sensing method (through-beam), response time (70ns), and operating temperature range (-40°C to 70°C).
Q: How do the different base product families (OPB931, OPB941, OPB981) differ? A: The provided data specifies only the parameters listed in the Key Parameters table. All three families maintain identical electrical and mechanical specifications for the parameters provided. Differentiation between families is not defined by the electrical or mechanical parameters in this reference.
Q: Which substitute part should be selected for new designs? A: Selection should prioritize active production parts with highest inventory availability. OPB941W51Z, OPB981T51Z, and OPB931W55Z represent the most readily available options.
Q: Is packaging different between substitute parts? A: No. All parts use identical packaging: Module with wire leads, bulk packaging, and chassis mount configuration.
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