OPB861L55 Equivalent & Substitute Parts

Part Overview

The OPB861L55 is an optical sensor manufactured by TT Electronics / Optek Technology, classified as a through-beam phototransistor optical sensor with PCB mount configuration. This component is designed for slot-type optical sensing applications with a 0.125" (3.18mm) sensing distance. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB861L55
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)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the OPB861L55 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: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: PCB Mount
Type: Unamplified

Substitute parts are classified into two categories:

MFR Recommended Substitute: OPB861T55 (onsemi) — Direct manufacturer-recommended alternative with identical base product designation.

Parametric Equivalents: OPB360 series (OPB360L11, OPB360L51, OPB360L55, OPB360T51, OPB360T55), OPB365 series (OPB365L51, OPB365T55), and OPB370 series (OPB370L55, OPB370T11) — All manufactured by TT Electronics/Optek Technology with matching electrical and mechanical specifications.

Parameter Comparison

Parameter	OPB861L55	OPB861T55	OPB360L11	OPB360L51	OPB360L55	OPB360T51	OPB360T55	OPB365L51	OPB365T55	OPB370L55	OPB370T11
Manufacturer	TT Electronics / Optek Technology	onsemi	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics / Optek Technology	TT Electronics/Optek Technology
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)
Sensing Method	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
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	Through Hole	Through Hole	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	PCB Mount	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
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS 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)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: OPB360 series (OPB360L11, OPB360L51, OPB360L55, OPB360T51, OPB360T55) and OPB365 series (OPB365L51, OPB365T55) are preferred substitutes. These parts are manufactured by TT Electronics/Optek Technology with active product status and full ROHS3 compliance, providing long-term availability and regulatory alignment.

Secondary Recommendation: OPB370 series (OPB370L55, OPB370T11) offers equivalent electrical and mechanical specifications with active product status and ROHS3 compliance.

Alternative Consideration: OPB861T55 (onsemi) is the manufacturer-recommended substitute but carries RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not a regulatory requirement.

All substitute parts maintain identical electrical performance parameters, operating temperature range, and mounting configuration as the OPB861L55, ensuring functional compatibility in through-beam optical sensing applications.

Frequently Asked Questions (FAQ)

Q: Can OPB360 series parts directly replace OPB861L55 in existing designs?

A: Yes. OPB360L11, OPB360L51, OPB360L55, OPB360T51, and OPB360T55 share identical electrical specifications (50 mA forward current, 30 mA collector current, 30 V breakdown voltage), sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), operating temperature range (-40°C to 85°C), and mounting type (through hole PCB mount). Physical footprint compatibility must be confirmed against your PCB layout.

Q: What is the difference between OPB360L55 and OPB360T55?

A: Both parts share identical electrical and sensing specifications. The designation suffix (L vs. T) indicates packaging or lead configuration variants within the OPB360 base product line. Consult the detailed datasheet for specific mechanical differences.

Q: Why is OPB861T55 listed as a substitute if it has different RoHS compliance?

A: OPB861T55 is the manufacturer-recommended direct substitute based on the OPB861 base product designation. However, it is RoHS non-compliant, whereas the original OPB861L55 is ROHS3 compliant. For new designs or applications requiring RoHS compliance, OPB360 or OPB365 series parts are recommended.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use PCB Mount packaging with through-hole mounting type, matching the OPB861L55 configuration. OPB861T55 uses Module, PC Pins, Slot Type packaging, which may require PCB layout modifications.

Q: What is the product status significance for component selection?

A: OPB861L55 is obsolete, making substitution necessary for ongoing production and support. All recommended OPB360, OPB365, and OPB370 series parts carry active product status, ensuring continued availability, manufacturing support, and compliance with current regulatory standards.

Q: Do all substitute parts meet REACH requirements?

A: Yes. All listed substitute parts, including OPB861T55, maintain REACH Unaffected status, matching the original OPB861L55 specification.

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