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OPB981N51Z Equivalent & Substitute Parts
Part Overview
The OPB981N51Z 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. 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
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | OPB981N51Z |
| Manufacturer | TT Electronics/Optek Technology |
| Category | Optical Sensors |
| Series | Photologic® |
| 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 |
| ECCN | EAR99 |
| HTSUS | 8541.49.8000 |
Substitute Part Grouping Explanation
Substitute parts for the OPB981N51Z are qualified based on strict electrical and mechanical parameter matching. All substitute candidates maintain identical specifications 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 are manufactured by TT Electronics/Optek Technology within the Photologic® series and are classified as active products, ensuring continued availability and supply chain reliability.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Sensing Distance | Sensing Method | Output Configuration | Current - Supply | Voltage - Supply | Response Time | Operating Temperature | Package / Case | RoHS Status | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OPB981N51Z | TT Electronics/Optek Technology | Obsolete | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 791 |
| OPB931W51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 1110 |
| OPB931W55Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 1456 |
| OPB941W51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 6965 |
| OPB941W55Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 756 |
| OPB981L11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 1152 |
| OPB981L51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 1793 |
| OPB981L55Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 628 |
| OPB981P11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 1101 |
| OPB981T11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 824 |
| OPB981T51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | NPN - Open Collector, Buffer | 15 mA | 4.75V ~ 5.25V | 70ns | -40°C ~ 70°C | Module, Wire Leads | ROHS3 Compliant | 1475 |
Engineering Selection Recommendations
All listed substitute parts are qualified direct replacements for the OPB981N51Z based on identical electrical and mechanical specifications. The primary distinction between the original part and substitutes is product status: OPB981N51Z is classified as obsolete, while all substitute candidates maintain active product status with TT Electronics/Optek Technology.
All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental and hazardous substance directives. Inventory availability varies across substitute options, with OPB941W51Z offering the highest stock level at 6965 units.
Selection among substitute parts should be based on application-specific requirements and supply chain availability. All candidates are electrically and mechanically interchangeable within systems designed for the OPB981N51Z.
Frequently Asked Questions (FAQ)
Q: Are all listed substitute parts electrically interchangeable with OPB981N51Z?
A: Yes. All substitute parts maintain identical electrical specifications including 15 mA supply current, 4.75V to 5.25V supply voltage range, 70ns response time, and NPN open collector buffer output configuration.
Q: What is the primary reason for identifying substitutes for OPB981N51Z?
A: OPB981N51Z is classified as an obsolete product. Active substitute parts ensure continued system support and supply chain reliability for new designs and production requirements.
Q: Are the substitute parts mechanically compatible with OPB981N51Z?
A: Yes. All substitute parts share identical mechanical specifications: 0.125" (3.18mm) sensing distance, through-beam sensing method, chassis mount configuration, and module with wire leads package type.
Q: Do all substitute parts meet the same compliance standards as OPB981N51Z?
A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original part.
Q: Which substitute part offers the best supply availability?
A: OPB941W51Z currently maintains the highest inventory level at 6965 units in stock.
Q: Can substitute parts be used in existing designs originally specified for OPB981N51Z?
A: Yes. All substitute parts are direct functional equivalents with no design modifications required. Electrical and mechanical interfaces remain identical.
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