OPB875T51 Equivalent & Substitute Parts

Part Overview

The OPB875T51 is an optical sensor manufactured by TT Electronics/Optek Technology, classified as a through-beam phototransistor optical sensor with PCB mount packaging. This component is designed for slot-type optical sensing applications with a 0.125" (3.18mm) sensing distance and unamplified phototransistor output configuration. The part is currently obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB875T51
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	Through Hole
Package / Case	PCB Mount
Type	Unamplified
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the OPB875T51 is determined by strict alignment of 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 Range: -40°C ~ 85°C
Type: Unamplified

Substitute parts are categorized into three groups:

Direct Manufacturer Substitute: OPB865T51 (onsemi) — functionally equivalent but with different mounting configuration (Module, PC Pins, Slot Type vs. PCB Mount).
Manufacturer Recommended Substitute: OPB875N51 (TT Electronics/Optek Technology) — same base product family with active product status, featuring pre-wired module packaging and chassis mount configuration instead of through-hole PCB mount.
Parametric Equivalents: OPB360L11, OPB360L51, OPB360L55, OPB360T51, OPB360T55, OPB365L51, OPB365T55, OPB370L55 (TT Electronics/Optek Technology) — all maintain identical electrical parameters and sensing specifications with active product status and PCB mount through-hole packaging.

Parameter Comparison

Parameter	OPB875T51	OPB865T51	OPB875N51	OPB360L11	OPB360L51	OPB360L55	OPB360T51	OPB360T55	OPB365L51	OPB365T55	OPB370L55
Manufacturer	TT Electronics/Optek	onsemi	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek	TT Electronics/Optek
Sensing Distance	0.125" (3.18mm)	Slot Type	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
Current - Collector (Ic) (Max)	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
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
Mounting Type	Through Hole	Module	Chassis Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	PCB Mount	Module, PC Pins, Slot Type	Module, Pre-Wired	PCB Mount	PCB Mount	PCB Mount	PCB Mount	PCB Mount	PCB Mount	PCB Mount	PCB Mount
Type	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified	Unamplified
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Non-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

For applications currently using the obsolete OPB875T51, the following selection criteria apply:

Preferred Substitutes (Active Product Status + ROHS3 Compliance + PCB Mount Through-Hole Packaging):

OPB360T51, OPB360L51, OPB360L55, OPB360T55, OPB365L51, OPB365T55, and OPB370L55 are direct parametric equivalents with identical electrical specifications, active product status, ROHS3 compliance, and PCB mount through-hole packaging. These components provide the highest compatibility for direct replacement in existing PCB designs.

Alternative Substitute (Active Product Status + ROHS3 Compliance + Different Mounting):

OPB875N51 is the manufacturer-recommended substitute from TT Electronics/Optek Technology with active product status and ROHS3 compliance. This component maintains identical electrical parameters and sensing specifications but features pre-wired module packaging with chassis mount configuration, requiring mechanical redesign for integration.

Non-Preferred Substitute (Obsolete Status + RoHS Non-Compliance):

OPB865T51 (onsemi) maintains electrical equivalence but carries obsolete product status and RoHS non-compliance, making it unsuitable for new designs or applications with regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can OPB360T51 directly replace OPB875T51 in existing designs?

A: Yes. OPB360T51 maintains identical electrical parameters (50 mA forward current, 30 mA collector current, 30 V breakdown voltage), operating temperature range (-40°C to 85°C), sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), and PCB mount through-hole packaging. No circuit modifications are required.

Q: What is the difference between OPB875N51 and OPB875T51?

A: OPB875N51 is the active product successor with identical electrical specifications and sensing parameters. The primary difference is packaging: OPB875T51 uses PCB mount through-hole configuration, while OPB875N51 uses pre-wired module packaging with chassis mount. PCB layout redesign is necessary for OPB875N51 integration.

Q: Why is OPB865T51 not recommended as a substitute?

A: OPB865T51 carries obsolete product status and RoHS non-compliance. While electrically equivalent, these factors make it unsuitable for new designs or applications subject to regulatory compliance requirements.

Q: Are all parametric equivalents interchangeable?

A: OPB360L11, OPB360L51, OPB360L55, OPB360T51, OPB360T55, OPB365L51, OPB365T55, and OPB370L55 are interchangeable from an electrical and mechanical standpoint. All maintain identical sensing distance, sensing method, output configuration, current ratings, voltage ratings, operating temperature, mounting type, and package configuration. Selection among these parts may be based on inventory availability and lead time.

Q: What compliance certifications apply to substitute parts?

A: All recommended substitute parts (OPB360 series, OPB365 series, OPB370L55, and OPB875N51) are ROHS3 compliant with MSL rating of 1 (Unlimited). All carry REACH Unaffected status and EAR99 ECCN classification.

Q: Does sensing distance remain constant across all substitutes?

A: Yes. All substitute parts maintain the 0.125" (3.18mm) sensing distance specification, ensuring compatibility with existing mechanical slot configurations and optical path designs.

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