OPB370L55 Equivalent & Substitute Parts

Part Overview

The OPB370L55 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 requiring 0.125" (3.18mm) sensing distance. The part is currently active in production status with ROHS3 compliance and REACH unaffected classification. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
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
ECCN	EAR99
HTSUS	8541.49.8000

Substitute Part Grouping Explanation

Substitute parts for the OPB370L55 are qualified based on strict equivalence 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
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

All substitute parts listed maintain identical electrical specifications and environmental ratings. Substitution is valid across OPB360, OPB365, OPB370, and OPB380 base product families when these parameters are matched.

Parameter Comparison

Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	Vce Breakdown (Max)	Operating Temperature	Mounting Type	Package	Type	RoHS Status	Inventory
OPB370L55	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	909 Pcs
OPB360L11	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	742 Pcs
OPB360T51	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	2007 Pcs
OPB360T55	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	769 Pcs
OPB365T55	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	4496 Pcs
OPB370T51	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	909 Pcs
OPB370T55	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1112 Pcs
OPB380L51Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1085 Pcs
OPB380T11Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1111 Pcs
OPB380T51Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	2503 Pcs
OPB380T55Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1036 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance. Selection among equivalent parts should be based on inventory availability and application-specific requirements within the qualified parameter set. OPB365T55 offers the highest inventory level at 4496 units. OPB360T51 provides 2007 units and OPB380T51Z provides 2503 units, representing alternative sources with substantial stock. All parts are REACH unaffected and carry identical ECCN and HTSUS classifications, ensuring regulatory consistency across substitution choices.

Frequently Asked Questions (FAQ)

Q: Can OPB360 series parts directly replace OPB370L55?

A: Yes. OPB360L11, OPB360T51, and OPB360T55 are direct parametric equivalents, maintaining identical electrical specifications, sensing distance, output configuration, and environmental ratings.

Q: What is the difference between OPB370L55 and OPB370T55?

A: Both parts share the OPB370 base product number and maintain identical electrical and mechanical parameters. Differences are limited to internal design variants not reflected in the provided specifications.

Q: Are OPB380 series parts with "Z" suffix compatible?

A: Yes. OPB380L51Z, OPB380T11Z, OPB380T51Z, and OPB380T55Z maintain all critical electrical parameters and environmental ratings equivalent to OPB370L55, enabling direct substitution.

Q: Does substitution require PCB layout modifications?

A: No. All substitute parts maintain identical mounting type (Through Hole) and package configuration (PCB Mount), ensuring mechanical compatibility without layout changes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory classification of OPB370L55.

Q: What inventory considerations apply to substitution?

A: OPB365T55 offers maximum availability at 4496 units. OPB380T51Z provides 2503 units. OPB360T51 provides 2007 units. Remaining alternatives range from 742 to 1112 units.

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