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OPB981P11 Equivalent & Substitute Parts
Part Overview
The OPB981P11 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 NPN open collector output configuration. This part is classified as obsolete, which necessitates identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct circuit substitution.
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 eligibility for the OPB981P11 is determined by strict equivalence across the following parameters: sensing distance (0.125"), sensing method (through-beam), output configuration (NPN open collector buffer), supply voltage range (4.75V–5.25V), current consumption (15 mA), response time (70ns), operating temperature range (-40°C to 70°C), mounting type (chassis mount), and package format (module with wire leads). All identified substitute parts maintain these specifications without deviation. The primary distinction between the main part and substitutes is product status: OPB981P11 is obsolete, while all substitute parts are active. Secondary distinctions include packaging format (OPB981P11 is unspecified; substitutes are bulk) and RoHS compliance status (OPB981P11 is non-compliant; substitutes are ROHS3 compliant).
Parameter Comparison
| Part Number | Manufacturer | Product Status | Sensing Distance | Sensing Method | Output Configuration | Voltage Supply | Current Supply | Response Time | Operating Temperature | Mounting Type | Package / Case | RoHS Status | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OPB981P11 | 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 | Chassis Mount | Module, Wire Leads | RoHS non-compliant | 771 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 1101 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 1110 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 1456 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 6965 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 756 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 1152 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 1793 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 628 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 824 |
| 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 | Chassis Mount | Module, Wire Leads | ROHS3 Compliant | 1475 |
Engineering Selection Recommendations
All listed substitute parts are functionally equivalent to OPB981P11 across all specified electrical and mechanical parameters. Selection among substitutes should prioritize active product status and ROHS3 compliance, both of which are satisfied by all alternatives. OPB981P11Z represents the direct equivalent with identical base product designation (OPB981). Parts designated OPB981L and OPB981T variants maintain the OPB981 base product number and are interchangeable. OPB931W and OPB941W variants represent alternative base product designations within the same Photologic® series that satisfy all substitution criteria. Inventory availability ranges from 628 to 6965 units across active alternatives, with OPB941W51Z offering the highest stock level.
Frequently Asked Questions (FAQ)
Q: Can OPB981P11 be directly replaced with OPB981P11Z? A: Yes. OPB981P11Z is the active equivalent of the obsolete OPB981P11, maintaining identical electrical specifications, sensing distance, output configuration, and mounting characteristics. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).
Q: Are OPB931W and OPB941W series parts compatible with OPB981P11? A: Yes. All OPB931W and OPB941W variants listed satisfy the complete set of substitution parameters: 0.125" sensing distance, through-beam sensing method, NPN open collector output, 4.75V–5.25V supply voltage, 15 mA current consumption, 70ns response time, -40°C to 70°C operating temperature, chassis mount configuration, and module wire lead packaging.
Q: What is the difference between OPB981L and OPB981T variants? A: Both OPB981L and OPB981T variants maintain identical electrical and mechanical specifications as OPB981P11. Differences in part number designation reflect internal manufacturer coding but do not affect functional equivalence for circuit substitution purposes.
Q: Does packaging format affect substitution eligibility? A: All substitute parts are supplied in bulk packaging format. The original OPB981P11 packaging format is unspecified in the provided data. All parts maintain identical module wire lead package configuration, ensuring mechanical compatibility in chassis mount applications.
Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original OPB981P11 is RoHS non-compliant. Substitution with any listed alternative upgrades compliance status to ROHS3.
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