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OPB891P51 Equivalent & Substitute Parts
Part Overview
The OPB891P51 is an optical sensor through-beam phototransistor module manufactured by TT Electronics/Optek Technology. This component features a 0.125" (3.18mm) sensing distance with pre-wired module packaging and chassis mount configuration. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system integration and design updates.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | OPB891P51 |
| Manufacturer | TT Electronics/Optek Technology |
| Category | Optical Sensors |
| Sensing Distance | 0.125" (3.18mm) |
| Sensing Method | Through-Beam |
| Output Configuration | Phototransistor |
| Current - DC Forward (If) (Max) | 50 mA |
| Current - Collector (Ic) (Max) | 30 mA |
| Voltage - Collector Emitter Breakdown (Max) | 30 V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Chassis Mount |
| Package / Case | Module, Pre-Wired |
| Type | Unamplified |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the OPB891P51 is determined by strict equivalence across the following critical parameters:
- Sensing Distance: 0.125" (3.18mm)
- Sensing Method: Through-Beam
- Output Configuration: Phototransistor
- Current - DC Forward (If) (Max): 50 mA
- Current - Collector (Ic) (Max): 30 mA
- Voltage - Collector Emitter Breakdown (Max): 30 V
- Operating Temperature: -40°C ~ 85°C
- Mounting Type: Chassis Mount
- Package / Case: Module, Pre-Wired
- Type: Unamplified
All substitute parts listed maintain identical electrical performance and mechanical form factor. The primary distinction between the obsolete OPB891P51 and active equivalents is product status and regulatory compliance. Substitute parts are classified as active and RoHS3 compliant, enabling continued procurement and system integration.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Sensing Distance | Sensing Method | Output Configuration | If (Max) | Ic (Max) | Vce Breakdown (Max) | Operating Temperature | Mounting Type | Package / Case | Type | RoHS Status | Inventory |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OPB891P51 | TT Electronics/Optek Technology | Obsolete | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | RoHS non-compliant | 875 Pcs |
| OPB891T51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | PCB Mount | Unamplified | ROHS3 Compliant | 1420 Pcs |
| OPB360N51 | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 1394 Pcs |
| OPB365N11 | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 658 Pcs |
| OPB365N51 | TT Electronics / Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 1916 Pcs |
| OPB365P55 | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 1052 Pcs |
| OPB370N51 | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 1250 Pcs |
| OPB370N55 | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 90400 Pcs |
| OPB375N51 | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 648 Pcs |
| OPB380N11Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 1100 Pcs |
| OPB380P51Z | TT Electronics/Optek Technology | Active | 0.125" (3.18mm) | Through-Beam | Phototransistor | 50 mA | 30 mA | 30 V | -40°C ~ 85°C | Chassis Mount | Module, Pre-Wired | Unamplified | ROHS3 Compliant | 651 Pcs |
Engineering Selection Recommendations
All listed substitute parts maintain full electrical and mechanical equivalence to the OPB891P51. The primary selection criterion is product status and regulatory compliance. The OPB891P51 is obsolete and RoHS non-compliant, whereas all substitute parts are active and RoHS3 compliant.
For applications requiring pre-wired module packaging with identical form factor, OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, and OPB380P51Z are direct parametric equivalents.
OPB891T51Z is functionally equivalent but features PCB mount packaging instead of pre-wired module configuration. This alternative is suitable for applications where PCB-level integration is preferred over chassis mounting.
All substitute parts are manufactured by TT Electronics/Optek Technology and carry ROHS3 compliance certification, ensuring regulatory alignment for current procurement and design requirements.
Frequently Asked Questions (FAQ)
Q: Can OPB891T51Z replace OPB891P51 in existing designs?
A: OPB891T51Z maintains identical electrical specifications and sensing performance. However, it features PCB mount packaging rather than pre-wired module configuration. Mechanical integration requirements must be evaluated for compatibility with existing chassis mount applications.
Q: Are all substitute parts RoHS3 compliant?
A: All listed substitute parts carry ROHS3 Compliant certification. The original OPB891P51 is RoHS non-compliant. Compliance verification is required for applications subject to RoHS regulatory requirements.
Q: What is the difference between OPB370N55 and other OPB370 variants?
A: OPB370N55 and OPB370N51 are parametrically identical across all electrical and mechanical specifications. Inventory availability differs, with OPB370N55 maintaining significantly higher stock levels (90400 Pcs versus 1250 Pcs).
Q: Do all substitute parts operate across the same temperature range?
A: All substitute parts operate across the identical temperature range of -40°C to 85°C, matching the OPB891P51 specification.
Q: What determines substitution eligibility for optical sensor through-beam phototransistor modules?
A: Substitution is determined by equivalence across sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), electrical ratings (50 mA If, 30 mA Ic, 30 V Vce), operating temperature range (-40°C to 85°C), mounting type (chassis mount), and package configuration (module, pre-wired or PCB mount).
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