OPB981N11Z Equivalent & Substitute Parts

Part Overview

The OPB981N11Z is an optical sensor manufactured by TT Electronics/Optek Technology, classified as a through-beam optical sensor module with 0.125" (3.18mm) sensing distance and wire leads. This component is part of the Photologic® series and operates with NPN open collector buffer output configuration. The OPB981N11Z is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where this sensor type is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB981N11Z
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

Substitute parts for the OPB981N11Z are determined by electrical and mechanical parameter equivalence within the Photologic® optical sensor family. All substitute parts maintain identical specifications 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

Substitute parts differ only in internal optical configuration and packaging format (bulk vs. other formats), which do not affect functional compatibility in applications requiring the specified electrical and mechanical parameters. All substitute parts are manufactured by TT Electronics/Optek Technology and carry active product status, ensuring availability and ongoing manufacturer support.

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)
OPB981N11Z	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	919
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 maintain full electrical and mechanical compatibility with the OPB981N11Z. Selection among substitute parts should be based on the following factors:

Product Status: All substitute parts carry active product status, ensuring continued manufacturer support, availability, and compliance updates. The OPB981N11Z is obsolete and should be replaced with an active equivalent for new designs and long-term system support.

Regulatory Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements equivalent to the original part.

Inventory Availability: Substitute parts demonstrate varying inventory levels. OPB941W51Z offers the highest inventory position at 6965 units, followed by OPB981L51Z at 1793 units. Parts with higher inventory levels provide greater supply chain security for production requirements.

Base Product Series: Substitute parts are organized within two base product families: OPB931, OPB941, and OPB981. All maintain identical functional parameters and are interchangeable at the application level.

Frequently Asked Questions (FAQ)

Q: Can OPB981N11Z be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical electrical specifications (15 mA supply current, 4.75V ~ 5.25V supply voltage, 70ns response time), mechanical configuration (chassis mount, module with wire leads), and functional parameters (0.125" through-beam sensing distance, NPN open collector buffer output). Direct substitution is supported without circuit modification.

Q: What is the difference between OPB931, OPB941, and OPB981 base product families?

A: The base product designations (OPB931, OPB941, OPB981) indicate internal optical configuration variants within the Photologic® series. All variants specified in this document maintain identical electrical and mechanical parameters. Selection between families is determined by application-specific optical performance requirements not differentiated by the provided electrical specifications.

Q: Why is the OPB981N11Z listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support for this specific part number. Active equivalent parts are available within the same product family and maintain full functional compatibility. Active parts ensure access to current inventory, ongoing compliance certifications, and manufacturer technical support.

Q: Are there packaging differences between substitute parts?

A: All substitute parts specified in this document use identical package configuration: Module with wire leads, chassis mount. Packaging format variations (such as bulk vs. other formats) do not affect electrical or mechanical compatibility in applications requiring the specified parameters.

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 OPB981N11Z. All parts carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from active product status parts with adequate inventory availability. OPB941W51Z, OPB981L51Z, and OPB981T51Z offer strong inventory positions and active manufacturer support. Selection among these options should be based on application-specific optical performance requirements and supply chain considerations.

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