OPB981T11Z Equivalent & Substitute Parts

Part Overview

The OPB981T11Z is an optical sensor manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This through-beam optical sensor operates at 0.125" (3.18mm) sensing distance with NPN open collector output configuration and wire lead packaging. The component is Active status and ROHS3 compliant, making it suitable for industrial sensing applications requiring reliable through-beam detection. Substitute parts are identified when inventory constraints, lead time requirements, or design flexibility necessitate alternative part selection while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB981T11Z
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
Voltage - Supply	4.75V ~ 5.25V
Current - Supply	15 mA
Response Time	70ns
Operating Temperature	-40°C ~ 70°C
Mounting Type	Chassis Mount
Package / Case	Module, Wire Leads
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the OPB981T11Z are qualified based on strict electrical and mechanical parameter matching. All substitute candidates maintain identical specifications across the following critical parameters:

Sensing Distance: 0.125" (3.18mm)
Sensing Method: Through-Beam
Output Configuration: NPN - Open Collector, Buffer
Voltage Supply Range: 4.75V ~ 5.25V
Current Supply: 15 mA
Response Time: 70ns
Operating Temperature Range: -40°C ~ 70°C
Mounting Type: Chassis Mount
Package / Case: Module, Wire Leads
RoHS Status: ROHS3 Compliant
Manufacturer: TT Electronics/Optek Technology
Series: Photologic®

Substitution is valid when all listed parameters are identical. Variations in base product number (OPB981, OPB931, OPB941) and suffix designations do not affect functional compatibility within this parameter set.

Parameter Comparison

Part Number	Sensing Distance	Sensing Method	Output Configuration	Voltage Supply	Current Supply	Response Time	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Product Status	Inventory (Pcs)
OPB981T11Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	824
OPB981P11Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	1101
OPB981L51Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	1793
OPB941W51Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	6965
OPB931W55Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	1456
OPB931W51Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	1110
OPB981T51Z	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	Active	1475

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original OPB981T11Z specification. Selection among equivalent parts should be based on inventory availability and supply chain requirements, as all candidates satisfy identical electrical and mechanical parameters.

The OPB941W51Z offers the highest inventory level at 6965 units, providing optimal supply chain flexibility. The OPB981 series variants (OPB981P11Z, OPB981L51Z, OPB981T51Z) maintain the same base product number as the original part, while OPB931 series parts (OPB931W51Z, OPB931W55Z) represent alternative base product options within the Photologic® series. All parts are manufactured by TT Electronics/Optek Technology and carry identical compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can OPB981T11Z be directly replaced with OPB941W51Z?

A: Yes. Both parts share identical electrical specifications (NPN output, 4.75V ~ 5.25V supply, 15 mA current, 70ns response time), mechanical configuration (0.125" sensing distance, through-beam method, chassis mount, wire leads), and compliance status (ROHS3). Direct substitution is valid.

Q: What is the difference between OPB981 and OPB931 base product numbers?

A: The base product number variation does not affect the electrical or mechanical parameters provided in this specification. Both series maintain identical sensing distance, output configuration, supply voltage, current draw, response time, operating temperature range, and mounting type. Substitution between series is valid based on the provided parameter set.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original OPB981T11Z specification.

Q: Does the suffix designation (T11Z, P11Z, L51Z, W51Z, W55Z, T51Z) affect compatibility?

A: No. Suffix designations do not alter the electrical or mechanical parameters that determine substitution compatibility. All parts maintain identical specifications across sensing distance, output configuration, voltage supply, current supply, response time, operating temperature, mounting type, and package configuration.

Q: Which substitute part has the best inventory availability?

A: OPB941W51Z offers the highest inventory level at 6965 units, followed by OPB981L51Z at 1793 units and OPB981T51Z at 1475 units.

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