OPB375N55 Equivalent & Substitute Parts

Part Overview

The OPB375N55 is an optical sensor through-beam phototransistor module manufactured by TT Electronics/Optek Technology. This component is classified as obsolete, with 900 units currently in stock. The sensor operates as an unamplified, pre-wired chassis mount module with a 0.125" (3.18mm) sensing distance and through-beam detection method. Due to its obsolete status, equivalent and substitute parts from the active product line are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB375N55
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.49.8000
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the OPB375N55 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence 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
REACH Status: REACH Unaffected

Mounting Consideration: The OPB375N55 uses chassis mount packaging with pre-wired module configuration. One substitute, OPB375T55, differs in mounting type (through-hole PCB mount) and is classified as a manufacturer-recommended alternative rather than a direct parametric equivalent. All other substitutes maintain identical chassis mount, pre-wired module packaging.

All identified substitutes are active products with higher inventory availability than the obsolete OPB375N55.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	Vce Breakdown (Max)	Operating Temp	Mounting Type	Package / Case	Type	Inventory
OPB375N55	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	900 Pcs
OPB375T55	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	794 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	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	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	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	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	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	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	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	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	651 Pcs

Engineering Selection Recommendations

All identified substitutes meet the electrical and mechanical specifications of the OPB375N55. Selection between active alternatives is determined by product availability and mounting requirements.

Direct Parametric Equivalents (Chassis Mount, Pre-Wired Module): OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, and OPB380P51Z are parametric equivalents with identical electrical ratings, sensing characteristics, and mounting configuration. All are active products with ROHS3 compliance and REACH unaffected status. OPB370N55 offers the highest inventory availability at 90,400 units.

Manufacturer-Recommended Alternative (PCB Mount): OPB375T55 is designated as the manufacturer-recommended substitute. This part maintains identical electrical specifications and sensing distance but differs in mounting type (through-hole PCB mount versus chassis mount). This alternative is suitable for applications where PCB-mounted integration is preferred over pre-wired chassis mounting.

Frequently Asked Questions (FAQ)

Q: Can OPB375T55 be used as a direct replacement for OPB375N55? A: OPB375T55 is electrically equivalent but differs in mounting configuration. OPB375N55 is a pre-wired chassis mount module, while OPB375T55 is a through-hole PCB mount component. Selection depends on the mechanical integration requirements of the application.

Q: What is the difference between the various substitute part numbers? A: All substitutes maintain identical electrical specifications (50 mA forward current, 30 mA collector current, 30 V breakdown voltage) and sensing characteristics (0.125" through-beam phototransistor). Differences exist only in internal component variants indicated by the suffix designations (N11, N51, N55, P55, P51Z, etc.). These variants are interchangeable from an electrical and functional standpoint.

Q: Why is OPB375N55 classified as obsolete? A: OPB375N55 is obsolete due to product line consolidation by the manufacturer. Active alternatives with identical specifications are available from the current product portfolio.

Q: Which substitute offers the best availability? A: OPB370N55 provides the highest inventory level at 90,400 units in stock, with identical electrical and mechanical specifications to OPB375N55.

Q: Are all substitutes RoHS3 compliant? A: All identified substitutes are ROHS3 compliant and REACH unaffected, matching the compliance status of OPB375N55.

Q: Can substitutes be used interchangeably in existing designs? A: Parametric equivalents with identical mounting types (OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, OPB380P51Z) are direct mechanical and electrical replacements. OPB375T55 requires mechanical redesign due to its PCB mount configuration.

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