OPB981P51Z Equivalent & Substitute Parts

Part Overview

The OPB981P51Z is a through-beam optical sensor module manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This component is classified as an optical sensor with a 0.125" (3.18mm) sensing distance, designed for chassis mount applications with wire leads. The OPB981P51Z is currently listed as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Active alternatives within the same electrical and mechanical specifications are available from the OPB931, OPB941, and OPB981 product families.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB981P51Z
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Series	Photologic®
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
Output Configuration	NPN - Open Collector, Buffer
Mounting Type	Chassis Mount
Current - Supply	15 mA
Voltage - Supply	4.75V ~ 5.25V
Response Time	70ns
Operating Temperature	-40°C ~ 70°C
Package / Case	Module, Wire Leads
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.49.8000

Substitute Part Grouping Explanation

Substitution eligibility for the OPB981P51Z is determined by strict equivalence across the following critical parameters:

Sensing Distance: 0.125" (3.18mm)
Sensing Method: Through-Beam
Output Configuration: NPN - Open Collector, Buffer
Mounting Type: Chassis Mount
Current - Supply: 15 mA
Voltage - Supply: 4.75V ~ 5.25V
Response Time: 70ns
Operating Temperature: -40°C ~ 70°C
Package / Case: Module, Wire Leads
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

All substitute parts listed below maintain identical electrical and mechanical specifications across these parameters. The primary distinction between substitute parts lies in product status (active versus obsolete) and packaging configuration (bulk versus other formats). Substitutes are drawn from three base product families: OPB931, OPB941, and OPB981.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	Current - Supply	Voltage - Supply	Response Time	Operating Temperature	Package / Case	RoHS Status	Inventory (Pcs)
OPB981P51Z	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	643
OPB931W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	1110
OPB931W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	1456
OPB941W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	6965
OPB941W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	756
OPB981L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	1152
OPB981L51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	1793
OPB981L55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	628
OPB981P11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	1101
OPB981T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	824
OPB981T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	Module, Wire Leads	ROHS3 Compliant	1475

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, providing regulatory continuity with the obsolete OPB981P51Z. Selection among equivalent parts should be based on inventory availability and packaging requirements. OPB941W51Z offers the highest inventory level at 6965 units. OPB981L51Z and OPB981T51Z provide alternatives within the OPB981 base family. OPB931W51Z and OPB931W55Z represent the OPB931 family, while OPB941W55Z represents the OPB941 family with lower inventory.

All substitute parts maintain identical electrical performance characteristics: 15 mA supply current, 4.75V to 5.25V supply voltage range, 70ns response time, and -40°C to 70°C operating temperature range. Mechanical compatibility is preserved through identical chassis mount configuration and module wire leads packaging.

Frequently Asked Questions (FAQ)

Q: Can OPB981P51Z be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical electrical and mechanical specifications across sensing distance, sensing method, output configuration, supply current, supply voltage, response time, operating temperature, and package type. Direct substitution is supported without circuit modification.

Q: What is the primary reason for seeking substitutes for OPB981P51Z?

A: The OPB981P51Z is classified as obsolete. All listed substitute parts are active products, ensuring long-term availability and supply chain continuity.

Q: Are there differences in packaging between substitute options?

A: The primary packaging distinction is between bulk and other formats. All parts share identical module wire leads configuration and chassis mount type. Packaging format does not affect electrical or mechanical compatibility.

Q: Do all substitute parts meet the same regulatory requirements?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original OPB981P51Z.

Q: Which substitute part offers the best inventory availability?

A: OPB941W51Z provides the highest inventory level at 6965 units, followed by OPB981L51Z at 1793 units and OPB931W55Z at 1456 units.

Q: Are there performance differences between OPB931, OPB941, and OPB981 base families?

A: No. All parts listed maintain identical electrical performance specifications including 70ns response time, 15 mA supply current, and 4.75V to 5.25V supply voltage range. Substitution between families is supported.

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