OPB891P55Z Equivalent & Substitute Parts

Part Overview

The OPB891P55Z is an optical sensor through-beam phototransistor module manufactured by TT Electronics / Optek Technology. This pre-wired chassis mount sensor operates with a 0.125" (3.18mm) sensing distance and is classified as an unamplified optical sensor. The part is currently active in production with 987 units in stock. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical specifications, and environmental operating parameters to ensure direct functional compatibility in applications requiring through-beam optical sensing.

Key Parameters

Parameter	OPB891P55Z
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

Substitute Part Grouping Explanation

Substitute parts for the OPB891P55Z are identified based on the following critical parameters that determine functional equivalence:

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 Range: -40°C minimum and 85°C maximum
Mounting Type: Chassis Mount
Package / Case: Module, Pre-Wired
Type: Unamplified
RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

All substitute parts listed match these parameters exactly, ensuring direct functional replacement without circuit redesign or application modification.

Parameter Comparison

Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temperature	Mounting Type	Package / Case	Type	RoHS Status	Inventory
OPB891P55Z	TT Electronics / Optek Technology	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	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
OPB365N51	TT Electronics / Optek Technology	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
OPB370N51	TT Electronics/Optek Technology	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	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	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
OPB380P51Z	TT Electronics/Optek Technology	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
OPB380P55Z	TT Electronics/Optek Technology	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	3121 Pcs
OPB390P11Z	TT Electronics/Optek Technology	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	1366 Pcs
OPB390P51Z	TT Electronics / Optek Technology	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
OPB829AZ	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	2154 Pcs

Engineering Selection Recommendations

All substitute parts listed are manufactured by TT Electronics / Optek Technology and maintain ROHS3 compliance and REACH unaffected status, consistent with the OPB891P55Z. Each part is classified as active in production status.

The OPB370N55 offers the highest inventory availability at 90,400 units, providing supply chain advantage for high-volume applications. The OPB380P55Z provides 3,121 units with identical electrical and thermal specifications to the OPB891P55Z.

One substitute part, OPB829AZ, operates within a reduced upper temperature limit of 80°C compared to the OPB891P55Z specification of 85°C. This part is suitable only for applications where the maximum operating temperature does not exceed 80°C.

All other substitute parts maintain the full -40°C to 85°C operating temperature range of the OPB891P55Z and are directly interchangeable without thermal derating considerations.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the OPB891P55Z?

A: Substitute parts must match all critical electrical and mechanical parameters: 0.125" (3.18mm) sensing distance, through-beam sensing method, phototransistor output configuration, 50 mA maximum forward current, 30 mA maximum collector current, 30 V maximum collector-emitter breakdown voltage, chassis mount configuration, pre-wired module package, and unamplified type classification. Operating temperature range must support -40°C to 85°C unless application requirements are lower.

Q: Can OPB829AZ be used in all applications where OPB891P55Z is specified?

A: OPB829AZ is suitable only for applications where the maximum operating temperature does not exceed 80°C. The OPB891P55Z is rated to 85°C. If the application requires operation at temperatures between 80°C and 85°C, OPB829AZ is not appropriate.

Q: Are all substitute parts pre-wired modules?

A: Yes. All substitute parts listed are supplied as pre-wired chassis mount modules with identical package configuration to the OPB891P55Z.

Q: Do all substitute parts have the same compliance certifications?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the OPB891P55Z compliance profile.

Q: Which substitute part has the best inventory availability?

A: OPB370N55 has the highest inventory at 90,400 units in stock, followed by OPB365N51 with 1,916 units and OPB380P55Z with 3,121 units.

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