OPB941W55 Equivalent & Substitute Parts

Part Overview

The OPB941W55 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 connections. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The OPB941W55 operates with NPN open collector buffer output, 15 mA supply current, and 4.75V to 5.25V supply voltage range, suitable for chassis mount applications requiring through-beam optical sensing.

Key Parameters

Parameter	Value
Manufacturer	TT Electronics/Optek Technology
Series	Photologic®
Category	Optical Sensors
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the OPB941W55 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), supply current (15 mA), supply voltage range (4.75V ~ 5.25V), response time (70ns), operating temperature range (-40°C ~ 70°C), package type (module with wire leads), and moisture sensitivity level (MSL 1).

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes are grouped by product status and RoHS compliance. The OPB941W55Z serves as the direct equivalent with active product status and RoHS3 compliance. Additional substitutes within the OPB931 and OPB981 base product families provide alternative sourcing options while maintaining full parameter compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	Supply Voltage	Supply Current	Response Time	Operating Temperature	RoHS Status	Packaging	Inventory (Pcs)
OPB941W55	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	RoHS non-compliant	Module, Wire Leads	883
OPB941W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	756
OPB931W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	1110
OPB931W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	1456
OPB941W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	6965
OPB981L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	1152
OPB981L51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	1793
OPB981L55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	628
OPB981P11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	1101
OPB981T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	824
OPB981T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	ROHS3 Compliant	Module, Wire Leads	1475

Engineering Selection Recommendations

For applications currently using the obsolete OPB941W55, the OPB941W55Z is the primary substitute, offering identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part maintains the same base product number (OPB941) and represents the direct continuation of the original design.

Alternative substitutes from the OPB931 and OPB981 base product families are fully compatible across all specified parameters. Selection among these alternatives should be based on inventory availability and supply chain considerations. All substitute parts carry active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

The OPB941W51Z offers the highest inventory level (6965 units), providing supply security for high-volume applications. The OPB931W55Z and OPB981L51Z provide additional sourcing options with substantial inventory levels (1456 and 1793 units respectively).

Frequently Asked Questions (FAQ)

Q: Can OPB941W55Z be used as a direct replacement for OPB941W55?

A: Yes. The OPB941W55Z maintains identical electrical and mechanical specifications across all critical parameters: 0.125" sensing distance, through-beam sensing method, NPN open collector buffer output, 15 mA supply current, 4.75V to 5.25V supply voltage, 70ns response time, -40°C to 70°C operating temperature, and module with wire leads packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: Are OPB931 and OPB981 series parts compatible with OPB941W55 applications?

A: Yes. All substitute parts from the OPB931W51Z, OPB931W55Z, OPB981L11Z, OPB981L51Z, OPB981L55Z, OPB981P11Z, OPB981T11Z, and OPB981T51Z part numbers maintain identical specifications across sensing distance, sensing method, output configuration, supply parameters, response time, operating temperature, and packaging. These parts are electrically and mechanically interchangeable.

Q: What is the difference between the various substitute part numbers?

A: All listed substitute parts share identical electrical and mechanical specifications as defined in this reference. Differences exist only in base product family designation (OPB941, OPB931, or OPB981) and internal design variants indicated by the alphanumeric suffix. These variations do not affect functional compatibility or performance in applications designed for the OPB941W55.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed carry ROHS3 compliance. The original OPB941W55 is RoHS non-compliant. Compliance status should be verified against specific regulatory requirements for your application.

Q: What packaging options are available?

A: All parts in this reference are supplied in module format with wire leads. Packaging is specified as bulk for all active substitute parts.

Q: Which substitute part offers the best supply availability?

A: The OPB941W51Z currently maintains the highest inventory level at 6965 units, followed by OPB931W55Z at 1456 units and OPB981L51Z at 1793 units. Inventory levels should be confirmed with your supplier for current availability.

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