OPB891P55 Equivalent & Substitute Parts

Part Overview

The OPB891P55 is an optical sensor through-beam phototransistor module manufactured by TT Electronics/Optek Technology. This component is classified as obsolete, with 1145 units currently in stock. The sensor features a 0.125" (3.18mm) sensing distance and unamplified phototransistor output configuration, designed for chassis mount applications in pre-wired module form.

Due to the obsolete product status of OPB891P55, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability. Active equivalent models from the same manufacturer provide functional compatibility while offering improved compliance and availability.

Key Parameters

Parameter	Value
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

Substitute parts for the OPB891P55 are classified based on strict electrical and mechanical parameter matching. All substitute candidates maintain identical specifications across the following critical parameters:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-Beam
Output configuration: Phototransistor
Maximum forward current (If): 50 mA
Maximum collector current (Ic): 30 mA
Maximum collector-emitter breakdown voltage: 30 V
Operating temperature range: -40°C ~ 85°C
Mounting type: Chassis Mount
Package type: Module, Pre-Wired
Sensor type: Unamplified

Substitutes are further categorized as direct manufacturer equivalents (OPB891P55Z) and parametric equivalents (OPB360N51, OPB365N11, OPB365N51, OPB365P55, OPB370N51, OPB370N55, OPB375N51, OPB380N11Z, OPB380P51Z). All listed parts are manufactured by TT Electronics/Optek Technology and share identical electrical and mechanical characteristics with the main part.

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 Status	Inventory
OPB891P55	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	1145 Pcs
OPB891P55Z	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	987 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 OPB891P55 is classified as obsolete and carries RoHS non-compliant status. All listed substitute parts are active products with ROHS3 compliance certification, meeting current regulatory requirements for electronic component manufacturing and distribution.

OPB891P55Z is the direct manufacturer equivalent, maintaining identical electrical and mechanical specifications while offering active product status and improved compliance. This part is the primary choice for direct replacement in existing designs.

For applications requiring maximum inventory availability, OPB370N55 offers the highest stock level at 90,400 units, ensuring supply chain continuity. OPB365N51 and OPB370N51 provide alternative options with substantial inventory reserves.

All substitute parts maintain identical electrical performance parameters, including current ratings, voltage specifications, and operating temperature range. Selection between parametric equivalents should be based on packaging requirements, inventory availability, and lead time considerations.

Frequently Asked Questions (FAQ)

Q: Can OPB891P55Z directly replace OPB891P55 in existing designs?

A: Yes. OPB891P55Z is the direct manufacturer equivalent with identical electrical and mechanical specifications. The primary difference is active product status and ROHS3 compliance. No design modifications are required.

Q: What is the difference between direct equivalents and parametric equivalents?

A: Direct equivalents (OPB891P55Z) share the same base model number with identical specifications. Parametric equivalents (OPB360N51, OPB365 series, OPB370 series, OPB375N51, OPB380 series) are different model numbers from the same manufacturer that meet all electrical and mechanical requirements. All are functionally interchangeable based on the specified parameters.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original OPB891P55 is RoHS non-compliant, making substitution necessary for designs requiring regulatory compliance.

Q: Do substitute parts require any circuit modifications?

A: No. All substitute parts maintain identical electrical specifications: 50 mA maximum forward current, 30 mA maximum collector current, 30 V maximum collector-emitter breakdown voltage, and -40°C to 85°C operating temperature range. Direct circuit substitution is supported.

Q: Which substitute part offers the best availability?

A: OPB370N55 provides the highest inventory level at 90,400 units in stock, offering optimal supply chain continuity for high-volume applications.

Q: Are there any packaging differences between substitute parts?

A: All substitute parts use identical packaging: Module, Pre-Wired configuration with Chassis Mount mounting type. No mechanical modifications to mounting or wiring are required.

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