OPB876P51 Equivalent & Substitute Parts

Part Overview

The OPB876P51 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 chassis mount packaging and unamplified phototransistor output configuration. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB876P51
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	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the OPB876P51 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
Type: Unamplified
RoHS Status: ROHS3 Compliant

Substitute parts are categorized into two groups:

MFR Recommended Substitute: OPB876T55 differs only in mounting type (Through Hole PCB Mount vs. Chassis Mount pre-wired) and product status (Active vs. Obsolete), maintaining all electrical and functional parameters.

Parametric Equivalents: OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, and OPB380P51Z share identical electrical specifications, sensing characteristics, and environmental ratings. All are active products with chassis mount pre-wired packaging matching the original form factor.

Parameter Comparison

Parameter	OPB876P51	OPB876T55	OPB360N51	OPB365N11	OPB365N51	OPB365P55	OPB370N51	OPB370N55	OPB375N51	OPB380N11Z	OPB380P51Z
Sensing Distance	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)
Sensing Method	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam
Output Configuration	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor	Phototransistor
Current - DC Forward (If) (Max)	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA
Current - Collector (Ic) (Max)	30 mA	30 mA	30 mA	30 mA	30 mA	30 mA	30 mA	30 mA	30 mA	30 mA	30 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Type	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified
Mounting Type	Chassis Mount	Through Hole	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Package / Case	Module, Pre-Wired	PCB Mount	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired	Module, Pre-Wired
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and functional equivalence to the OPB876P51 across all critical parameters. All alternatives are ROHS3 compliant and carry active product status, ensuring ongoing availability and supply chain continuity.

For direct form-factor replacement in existing chassis mount applications, select from the parametric equivalents: OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, or OPB380P51Z. These parts maintain identical pre-wired module packaging and chassis mount configuration.

For applications permitting PCB mount integration, OPB876T55 provides the manufacturer-recommended alternative with identical electrical specifications and active product status, differing only in mounting methodology.

Frequently Asked Questions (FAQ)

Q: Can OPB876T55 directly replace OPB876P51 in existing assemblies?

A: OPB876T55 is electrically equivalent but differs in mounting type. OPB876P51 uses chassis mount pre-wired configuration, while OPB876T55 requires through-hole PCB mounting. Direct mechanical substitution is not possible without redesign of the mounting interface.

Q: Are all listed substitute parts electrically interchangeable?

A: Yes. All substitute parts share identical electrical specifications: 50 mA maximum DC forward current, 30 mA maximum collector current, 30 V maximum collector-emitter breakdown voltage, and -40°C to 85°C operating temperature range. All feature through-beam sensing at 0.125" (3.18mm) distance with unamplified phototransistor output.

Q: What is the difference between the parametric equivalents?

A: The parametric equivalents (OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, OPB380P51Z) differ only in base product series designation and packaging suffix codes. All maintain identical electrical performance, sensing characteristics, and pre-wired chassis mount form factor.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original OPB876P51 compliance status.

Q: Which substitute part has the highest inventory availability?

A: OPB370N55 maintains the highest inventory level at 90,400 pieces in stock, followed by OPB365N51 at 1,916 pieces.

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