OPB877L55 Equivalent & Substitute Parts

Part Overview

The OPB877L55 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 and unamplified phototransistor output.

The OPB877L55 carries an obsolete product status. Equivalent and substitute parts listed below maintain identical electrical and mechanical parameters, enabling direct functional replacement in applications requiring through-beam optical sensing with phototransistor output.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB877L55
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the OPB877L55 are qualified based on strict parameter equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key 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
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

All substitute parts listed maintain identical values across these parameters, ensuring functional and mechanical compatibility in PCB mount through-beam optical sensing applications.

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	Type	RoHS	MSL	REACH	Inventory
OPB877L55	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	781 Pcs
OPB877T55	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	1 (Unlimited)	REACH Unaffected	1483 Pcs
OPB360L11	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	1 (Unlimited)	REACH Unaffected	742 Pcs
OPB360L51	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	1 (Unlimited)	REACH Unaffected	688 Pcs
OPB360L55	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	1 (Unlimited)	REACH Unaffected	1118 Pcs
OPB360T51	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	1 (Unlimited)	REACH Unaffected	2007 Pcs
OPB360T55	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	1 (Unlimited)	REACH Unaffected	769 Pcs
OPB365L51	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	1 (Unlimited)	REACH Unaffected	1132 Pcs
OPB365T55	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	1 (Unlimited)	REACH Unaffected	4496 Pcs
OPB370L55	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	1 (Unlimited)	REACH Unaffected	909 Pcs
OPB370T11	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	1 (Unlimited)	REACH Unaffected	909 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical parameter equivalence with the OPB877L55. Selection among available substitutes should be based on product status and inventory availability.

OPB877T55 is the manufacturer-recommended direct substitute, carrying active product status with the highest inventory level (1483 Pcs). This part is the primary choice for new designs and production applications.

Parametric equivalents OPB360L11, OPB360L51, OPB360L55, OPB360T51, OPB360T55, OPB365L51, OPB365T55, OPB370L55, and OPB370T11 are all active products with confirmed parameter equivalence. These parts are suitable for direct replacement in existing applications.

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original OPB877L55.

Frequently Asked Questions (FAQ)

Q: Can OPB877T55 be used as a direct replacement for OPB877L55?

A: Yes. OPB877T55 is the manufacturer-recommended substitute with identical electrical and mechanical parameters. The primary difference is product status (active vs. obsolete) and packaging format (bulk).

Q: What are the key parameters that determine substitutability for the OPB877L55?

A: Substitutability is determined by matching all of the following: sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), maximum forward current (50 mA), maximum collector current (30 mA), collector-emitter breakdown voltage (30 V), operating temperature range (-40°C to 85°C), mounting type (through hole), package type (PCB mount), and unamplified sensor type.

Q: Are all listed substitute parts from the same manufacturer?

A: Yes. All substitute parts are manufactured by TT Electronics/Optek Technology, ensuring consistent design and performance characteristics.

Q: What is the difference between OPB360 and OPB365 series parts?

A: Both series maintain identical electrical and mechanical parameters specified for the OPB877L55. Differences exist only in part number designation and internal design variants, with no impact on functional substitutability.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the OPB877L55.

Q: Which substitute part has the highest inventory availability?

A: OPB365T55 has the highest inventory level at 4496 Pcs, followed by OPB877T55 at 1483 Pcs.

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