OPB876P55 Equivalent & Substitute Parts

Part Overview

The OPB876P55 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	OPB876P55
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 OPB876P55 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
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are categorized into two groups:

MFR Recommended Substitute: OPB876T55 differs only in mounting type (Through Hole PCB Mount instead of Chassis Mount pre-wired) and product status (Active instead of Obsolete). All electrical and environmental parameters remain identical.

Parametric Equivalents: OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, and OPB380P51Z maintain complete electrical and environmental parameter equivalence with identical sensing distance, method, output configuration, current ratings, voltage ratings, temperature range, and compliance certifications. All are active products with chassis mount pre-wired packaging.

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
OPB876P55	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	ROHS3 Compliant	1128 Pcs
OPB876T55	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1118 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 complete electrical and environmental parameter equivalence with the OPB876P55. Selection between alternatives is based on product status and availability:

Primary Recommendation: OPB370N55 is the preferred substitute, offering active product status with the highest inventory availability (90,400 units), ensuring supply chain continuity and long-term support.

Alternative Selections: OPB365N51 (1,916 units), OPB370N51 (1,250 units), and OPB365P55 (1,052 units) provide additional active alternatives with substantial inventory levels.

PCB Mount Alternative: OPB876T55 is the manufacturer-recommended substitute for applications requiring PCB mount through-hole installation instead of chassis mount pre-wired configuration. This part maintains identical electrical specifications and active product status.

All substitute parts comply with ROHS3 and maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with existing compliance and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can OPB876T55 directly replace OPB876P55 in existing assemblies?

A: OPB876T55 is electrically equivalent but differs in mounting configuration. OPB876P55 is pre-wired chassis mount, while OPB876T55 is through-hole PCB mount. Direct mechanical substitution requires design modification to accommodate the different mounting interface.

Q: What is the difference between the parametric equivalent parts (OPB360N51, OPB365N11, etc.)?

A: All parametric equivalents maintain identical electrical specifications, sensing distance, output configuration, and environmental ratings. Differences exist only in base product number designations and internal design variants. Selection can be based on inventory availability and lead time.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original OPB876P55 specifications.

Q: Why is OPB876P55 listed as obsolete?

A: The OPB876P55 is no longer in active production. Equivalent active alternatives from the same manufacturer provide identical functional performance and are recommended for new designs and ongoing system support.

Q: Can I use OPB370N55 as a drop-in replacement?

A: OPB370N55 is electrically and functionally equivalent with identical chassis mount pre-wired packaging. Mechanical compatibility depends on connector type and form factor specifications not provided in this reference. Physical verification is required before implementation.

Q: What inventory levels should I consider for long-term supply planning?

A: OPB370N55 offers the highest inventory (90,400 units), providing optimal supply chain security. OPB365N51 (1,916 units) and OPB370N51 (1,250 units) provide secondary alternatives with substantial availability.

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