OPB981L55Z Equivalent & Substitute Parts

Part Overview

The OPB981L55Z 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 part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory availability, supply chain considerations, or design flexibility within the same product family.

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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the OPB981L55Z are qualified based on identical electrical and mechanical parameters across the following criteria:

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
Regulatory compliance: ROHS3 Compliant, REACH Unaffected

All substitute parts listed maintain these specifications and are manufactured by TT Electronics/Optek Technology within the Photologic® series. Substitution is valid across different base product numbers (OPB931, OPB941, OPB981) when all electrical and mechanical parameters remain constant.

Parameter Comparison

Part Number	Manufacturer	Series	Sensing Distance	Output Configuration	Voltage Supply	Current Supply	Response Time	Operating Temperature	RoHS Status	Product Status
OPB981L55Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active
OPB931W51Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active
OPB931W55Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active
OPB941W51Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active
OPB981L51Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active
OPB981P11Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active
OPB981T51Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance. Selection between OPB981L55Z and its substitutes is determined by availability and design requirements within the specified electrical and mechanical parameters. Each part is manufactured by TT Electronics/Optek Technology and carries identical regulatory certifications (REACH Unaffected, EAR99 ECCN classification). Wire lead packaging and chassis mount configuration remain consistent across all listed alternatives. The NPN open collector output configuration with 70ns response time is maintained across the entire substitute group, ensuring functional equivalence in through-beam optical sensing applications at 0.125" (3.18mm) sensing distance.

Frequently Asked Questions (FAQ)

Q: Can OPB981L55Z be directly replaced with OPB931W51Z or OPB941W51Z?

A: Yes. All substitute parts maintain identical electrical specifications (4.75V ~ 5.25V supply, 15 mA current, 70ns response time), identical sensing distance (0.125" / 3.18mm), identical output configuration (NPN - Open Collector, Buffer), and identical operating temperature range (-40°C ~ 70°C). Wire lead packaging and chassis mount configuration are consistent across all parts.

Q: Are there differences between OPB981 series substitutes and OPB931 or OPB941 series substitutes?

A: The base product numbers (OPB981, OPB931, OPB941) differ, but all listed substitutes maintain identical electrical and mechanical parameters specified for through-beam optical sensing at 0.125" (3.18mm). Substitution is valid based on parameter equivalence.

Q: What is the significance of the suffix variations (L55Z, L51Z, P11Z, T51Z, W51Z, W55Z)?

A: Suffix variations indicate different packaging or configuration options within the Photologic® series. All listed parts maintain the core electrical and mechanical specifications required for substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected certification, matching the regulatory compliance of OPB981L55Z.

Q: Can these parts be used in applications requiring -40°C ~ 70°C operating temperature?

A: Yes. All substitute parts are rated for -40°C ~ 70°C operating temperature range.

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