OPB390P51 Equivalent & Substitute Parts

Part Overview

The OPB390P51 is an optical sensor through-beam phototransistor module manufactured by TT Electronics / Optek Technology. This chassis-mount, pre-wired module operates with a 0.125" (3.18mm) sensing distance and unamplified phototransistor output configuration. The OPB390P51 is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. Active alternatives with identical electrical and mechanical parameters are available from the same manufacturer series.

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	Chassis Mount
Package / Case	Module, Pre-Wired
Type	Unamplified
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the OPB390P51 is determined by strict equivalence across the following critical parameters:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-beam
Output configuration: Phototransistor
Current ratings: If (Max) 50 mA, Ic (Max) 30 mA
Voltage rating: Collector-Emitter Breakdown 30 V
Operating temperature range: -40°C ~ 85°C
Mounting type: Chassis Mount
Package type: Module, Pre-Wired
Type: Unamplified

All substitute parts listed maintain identical electrical and mechanical specifications. The primary distinction between the OPB390P51 and its substitutes is product status and regulatory compliance. The OPB390P51 is obsolete and RoHS non-compliant, while all listed substitutes are active products with ROHS3 compliance.

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 / Case	Type	RoHS Status	Inventory
OPB390P51	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	RoHS non-compliant	700 Pcs
OPB390P51Z	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	ROHS3 Compliant	832 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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	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	ROHS3 Compliant	651 Pcs

Engineering Selection Recommendations

The OPB390P51 is obsolete and RoHS non-compliant. All listed substitute parts are active products with ROHS3 compliance, making them suitable for new designs and ongoing system support where regulatory compliance is required.

OPB390P51Z is the direct equivalent with identical part number designation and bulk packaging. This part maintains the same electrical and mechanical specifications as the original OPB390P51 while providing active product status and ROHS3 compliance.

OPB370N55 offers the highest inventory availability at 90,400 units, providing supply chain stability for high-volume applications. OPB365N51 and OPB370N51 also maintain substantial inventory levels exceeding 1,200 units each.

All substitute parts share identical electrical ratings, operating temperature range, sensing distance, and package configuration. Selection between alternatives depends on packaging preference, inventory availability, and specific design requirements for connector or lead configuration.

Frequently Asked Questions (FAQ)

Q: Can OPB390P51 be directly replaced with OPB390P51Z?

A: Yes. OPB390P51Z is the direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). OPB390P51Z is suitable for direct substitution in existing designs.

Q: What determines compatibility between OPB390P51 and other substitute parts?

A: Compatibility is determined by matching sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), current ratings (If 50 mA max, Ic 30 mA max), voltage rating (30 V VCE breakdown), operating temperature range (-40°C to 85°C), mounting type (chassis mount), and package type (module, pre-wired, unamplified). All listed substitutes meet these criteria.

Q: Are there differences in connector or lead configuration between substitute parts?

A: The provided specifications do not include detailed connector or lead configuration data. Verify mechanical compatibility with your specific application before implementation.

Q: Why is RoHS compliance important for this substitution?

A: The OPB390P51 is RoHS non-compliant, while all active substitutes are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, ROHS3-compliant parts are necessary. For legacy systems without regulatory requirements, non-compliance may not be a limiting factor.

Q: Which substitute part offers the best supply availability?

A: OPB370N55 provides the highest inventory level at 90,400 units, followed by OPB365N51 at 1,916 units and OPB370N51 at 1,250 units. For high-volume or long-term production requirements, OPB370N55 offers superior supply chain stability.

Q: Are all substitute parts from the same manufacturer?

A: Yes. All substitute parts are manufactured by TT Electronics / Optek Technology, ensuring consistent design standards and quality control across the product family.

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