OPB981L11 Equivalent & Substitute Parts

Part Overview

The OPB981L11 is an optical sensor from TT Electronics/Optek Technology's Photologic® series, designed as a through-beam sensor with 0.125" (3.18mm) sensing distance and wire lead packaging. This part is classified as obsolete, which necessitates identification of active equivalent models that maintain identical electrical and mechanical specifications for direct replacement in existing applications.

Key Parameters

Parameter	Value
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
Series	Photologic®

Substitute Part Grouping Explanation

Substitution of the OPB981L11 is based on strict equivalence across all electrical and mechanical parameters. The following criteria determine valid substitutes:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-Beam
Output configuration: NPN - Open Collector, Buffer
Supply voltage range: 4.75V ~ 5.25V
Supply current: 15 mA
Response time: 70ns
Operating temperature range: -40°C ~ 70°C
Mounting type: Chassis Mount
Package type: Module, Wire Leads
Series: Photologic®

All substitute parts listed maintain these specifications without deviation. The primary distinction between the OPB981L11 and its substitutes is product status: the original part is obsolete, while all listed equivalents are active production parts.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Output Configuration	Voltage Supply	Current Supply	Response Time	Operating Temperature	RoHS Status	Inventory (Pcs)
OPB981L11	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	RoHS non-compliant	863
OPB981L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	1152
OPB981L51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	1793
OPB981L55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	628
OPB981P11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	1101
OPB981T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	824
OPB981T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	1475
OPB931W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	1110
OPB931W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	1456
OPB941W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	6965
OPB941W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	756

Engineering Selection Recommendations

All listed substitute parts are active production components from TT Electronics/Optek Technology and maintain full electrical and mechanical compatibility with the OPB981L11. The primary advantage of substitution is transition from an obsolete part to active production status, ensuring long-term supply availability.

All substitute parts are ROHS3 compliant, whereas the original OPB981L11 is RoHS non-compliant. This compliance upgrade is significant for applications subject to RoHS regulations. All parts share identical REACH status (REACH Unaffected) and ECCN/HTSUS classifications.

Selection among the available substitutes should be based on inventory availability and specific application requirements, as all parts are electrically and mechanically equivalent. OPB941W51Z offers the highest inventory level at 6965 units, providing supply security for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can OPB981L11 be directly replaced with any of the listed substitutes?

A: Yes. All listed parts maintain identical electrical specifications (voltage, current, response time), mechanical configuration (chassis mount, wire leads), and sensing characteristics (0.125" through-beam, NPN output). Direct substitution is supported without circuit modification.

Q: What is the difference between OPB981L11 and OPB981L11Z?

A: The primary difference is product status and RoHS compliance. OPB981L11 is obsolete and RoHS non-compliant, while OPB981L11Z is an active production part with ROHS3 compliance. All electrical and mechanical parameters are identical.

Q: Why are there multiple part numbers (OPB981, OPB931, OPB941 series)?

A: These represent different base product lines within the Photologic® series. Despite different base designations, all listed parts maintain the specified electrical and mechanical parameters that define substitution compatibility for this application.

Q: Are there any packaging differences between substitutes?

A: All substitute parts are supplied in bulk packaging with module, wire leads configuration. The OPB981L11 original part does not specify packaging type, while all active substitutes are bulk packaged.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected. They share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications with the original part.

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