OPB881P51Z Equivalent & Substitute Parts

Part Overview

The OPB881P51Z is an optical sensor through-beam phototransistor module manufactured by TT Electronics/Optek Technology. This component features a 0.125" (3.18mm) sensing distance with phototransistor output configuration, designed for chassis mount applications in pre-wired module form. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible optical sensing functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB881P51Z
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 OPB881P51Z are qualified based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical 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
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 parts are categorized into two groups: MFR Recommended substitutes (active product status) and Parametric Equivalents (active product status). All substitute parts are currently active, providing long-term availability compared to the obsolete OPB881P51Z.

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
OPB881P51Z	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	976 Pcs
OPB881L51Z	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	639 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

All substitute parts listed maintain full electrical and mechanical compatibility with the OPB881P51Z. Selection among available substitutes is based on product status and regulatory compliance:

All substitute parts are currently active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current manufacturing standards. The OPB881L51Z serves as the MFR recommended substitute, offering direct functional replacement with active product status.

For applications requiring maximum inventory availability, OPB370N55 provides the highest stock level at 90,400 pieces. For applications with specific packaging or connector requirements, alternative part numbers within the OPB360, OPB365, OPB370, OPB375, and OPB380 series maintain identical electrical specifications and are suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can OPB881L51Z directly replace OPB881P51Z? A: Yes. OPB881L51Z is the MFR recommended substitute with identical electrical specifications, sensing distance, output configuration, and operating temperature range. The primary difference is active product status versus obsolete status.

Q: What distinguishes the OPB360, OPB365, OPB370, OPB375, and OPB380 series from OPB881? A: These are parametric equivalents sharing identical electrical and mechanical specifications. All maintain 0.125" (3.18mm) through-beam sensing distance, phototransistor output, 50 mA forward current, 30 mA collector current, and -40°C to 85°C operating temperature. Series designation reflects internal design variations that do not affect functional compatibility.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the difference between packaging designations in part numbers? A: Packaging designations (such as N51, N55, P55, P51Z, N11Z) indicate connector type and lead configuration. All listed parts maintain Module, Pre-Wired package configuration suitable for chassis mount applications.

Q: Can I use OPB370N55 instead of OPB881P51Z? A: Yes. OPB370N55 is a parametric equivalent with identical electrical specifications,

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