OPB963P51 Equivalent & Substitute Parts

Part Overview

The OPB963P51 is an optical sensor manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This through-beam optical sensor features a 0.125" (3.18mm) sensing distance with PCB mount configuration and NPN open collector inverted output. The part is Active status and widely used in industrial sensing applications requiring precise object detection. Substitute parts are necessary to address inventory availability, lead time constraints, or design flexibility across compatible OPB963 and OPB973 series variants.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB963P51
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, Inverted
Mounting Type	Through Hole
Current - Supply	15 mA
Voltage - Supply	4.75V ~ 5.25V
Response Time	70ns
Operating Temperature	-40°C ~ 70°C
Package / Case	PCB Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the OPB963P51 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, Inverted
Mounting Type: Through Hole
Current - Supply: 15 mA
Voltage - Supply: 4.75V ~ 5.25V
Response Time: 70ns
Operating Temperature: -40°C ~ 70°C
Package / Case: PCB Mount

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes are drawn from two base product families: OPB963 series (same base number) and OPB973 series (compatible Photologic® variant). Packaging suffix variations (N51, T55, N11, T51) represent different tape and reel configurations or internal component sourcing, which do not affect functional performance or circuit compatibility.

Parameter Comparison

Part Number	Sensing Distance	Sensing Method	Output Configuration	Supply Current	Supply Voltage	Response Time	Operating Temperature	Mounting Type	RoHS Status	Inventory (Pcs)
OPB963P51	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	997
OPB963N51	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	2795
OPB963T55	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	1444
OPB973N11	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	1238
OPB973N51	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	6130
OPB973T51	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	918
OPB973T55	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant	1430

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with current manufacturing standards. OPB973N51 offers the highest inventory availability at 6130 units, providing supply chain stability for high-volume applications. OPB963N51 and OPB963T55 maintain the original OPB963 base product number with substantial inventory levels (2795 and 1444 units respectively), suitable for designs requiring strict part number consistency. OPB973 series variants (N11, N51, T51, T55) provide functionally equivalent alternatives with identical electrical performance, appropriate for applications where base product family flexibility is acceptable. Selection should prioritize inventory availability and packaging configuration requirements rather than base product family, as all parts deliver identical circuit performance.

Frequently Asked Questions (FAQ)

Q: Can OPB973 series parts directly replace OPB963 series parts in existing designs?

A: Yes. Both OPB963 and OPB973 series parts share identical electrical specifications across all critical parameters: sensing distance, output configuration, supply voltage, current draw, response time, and operating temperature range. Circuit-level compatibility is complete. The base product number difference reflects internal design variants within the Photologic® family but does not affect functional performance or pinout configuration.

Q: What do the suffix codes (N51, T55, N11, T51) represent?

A: Suffix codes indicate packaging and tape/reel configuration variants. These designations do not affect electrical performance, sensing characteristics, or circuit compatibility. Selection between suffix variants should be based on procurement requirements, such as tape width, reel size, or component sourcing preferences.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts, including the OPB963P51 main part, carry ROHS3 compliance certification and REACH Unaffected status, meeting current environmental and regulatory requirements for industrial and commercial applications.

Q: What is the difference between through-beam sensing and other optical sensor types?

A: Through-beam sensing requires the light source and receiver to be positioned on opposite sides of the detection area, with the object interrupting the light path to trigger detection. This configuration provides reliable detection of opaque objects and is distinct from reflective or diffuse sensing methods. All listed parts employ through-beam architecture.

Q: Can I mix different suffix variants in the same production run?

A: Yes. Since all suffix variants deliver identical electrical and mechanical performance, they can be used interchangeably within the same circuit design and production environment. However, procurement and inventory management should account for packaging differences if automated handling or specific tape/reel specifications are required.

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