OPB881P55Z Equivalent & Substitute Parts

Part Overview

The OPB881P55Z 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 part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this sensor category.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB881P55Z
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the OPB881P55Z are selected based on strict electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications across the following critical parameters:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-beam
Output configuration: Phototransistor (unamplified)
Maximum forward current (If): 50 mA
Maximum collector current (Ic): 30 mA
Collector-emitter breakdown voltage: 30 V
Operating temperature range: -40°C ~ 85°C
Mounting type: Chassis mount
Package type: Module, pre-wired
Regulatory compliance: ROHS3 compliant, REACH unaffected

Substitutes are differentiated by product status (active vs. obsolete) and packaging configuration (bulk vs. module variants). The OPB881T55Z serves as the manufacturer-recommended direct equivalent with active product status. Additional parametric equivalents from the OPB360, OPB365, OPB370, OPB375, and OPB380 series provide alternative sourcing options while maintaining full electrical and mechanical compatibility.

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 Type	Type	RoHS Status	Inventory
OPB881P55Z	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	ROHS3 Compliant	802 Pcs
OPB881T55Z	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	8790 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 OPB881T55Z is the manufacturer-recommended direct equivalent, offering identical electrical and mechanical specifications with active product status and significantly higher inventory availability (8790 units). This part is the primary selection for new designs and replacement applications.

All listed substitute parts maintain full compliance with ROHS3 and REACH requirements, matching the regulatory profile of the original OPB881P55Z. The OPB370N55 variant provides the highest inventory level (90400 units), supporting high-volume applications. Parts from the OPB360, OPB365, OPB370, OPB375, and OPB380 series are parametrically equivalent and suitable for direct substitution where the specific base product number is not a design constraint.

Selection between active substitutes should prioritize inventory availability and lead time requirements, as all parts share identical electrical performance and environmental operating specifications.

Frequently Asked Questions (FAQ)

Q: Can OPB881P55Z be directly replaced with OPB881T55Z?

A: Yes. The OPB881T55Z is the manufacturer-recommended equivalent with identical electrical specifications, sensing distance, output configuration, and operating temperature range. The primary difference is product status (active vs. obsolete) and packaging (bulk vs. module).

Q: What determines compatibility between OPB881P55Z and other substitute parts?

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

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original OPB881P55Z.

Q: What is the difference between OPB881T55Z and OPB370N55?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The difference lies in the base product series (OPB881 vs. OPB370). OPB370N55 offers significantly higher inventory availability (90400 units vs. 8790 units).

Q: Can I use OPB365P55 as a substitute?

A: Yes. OPB365P55 meets all electrical and mechanical requirements for substitution, including sensing distance, current ratings, voltage specifications, and operating temperature range. Inventory availability is 1052 units.

Q: Are there any packaging differences between substitute parts?

A: All substitute parts use identical packaging: chassis-mount, pre-wired module configuration. Packaging designation differences in part numbers (such as N11, N51, P55, P51Z) reflect internal manufacturing variants but do not affect electrical performance or mechanical compatibility.

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