OPB991N11Z Equivalent & Substitute Parts

Part Overview

The OPB991N11Z is a through-beam optical sensor module manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This component features a 0.125" (3.18mm) sensing distance with NPN open collector buffer output configuration, designed for chassis mount applications. The OPB991N11Z is classified as obsolete product status. Equivalent and substitute parts within the OPB991 base product family are available in active status with identical electrical and mechanical specifications, providing direct functional replacement options for new designs and legacy system maintenance.

Key Parameters

Parameter	Value
Manufacturer	TT Electronics/Optek Technology
Series	Photologic®
Category	Optical Sensors
Sensing Method	Through-Beam
Sensing Distance	0.125" (3.18mm)
Output Configuration	NPN - Open Collector, Buffer
Voltage Supply Range	4.5V ~ 16V
Current Supply	12 mA
Response Time	70ns
Operating Temperature Range	-40°C ~ 70°C
Mounting Type	Chassis Mount
Package / Case	Module, Wire Leads
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

All substitute parts listed maintain identical electrical and mechanical parameters with the OPB991N11Z. Substitution is based on the following criteria:

Sensing method: Through-Beam
Sensing distance: 0.125" (3.18mm)
Output configuration: NPN - Open Collector, Buffer
Supply voltage range: 4.5V ~ 16V
Supply current: 12 mA
Response time: 70ns
Operating temperature: -40°C ~ 70°C
Mounting type: Chassis Mount
Package type: Module, Wire Leads
Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The substitute parts differ only in packaging designation (Bulk vs. standard) and product status (Active vs. Obsolete). All variants share the same base product number OPB991 and are functionally equivalent for circuit-level applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Output Configuration	Voltage Supply	Current Supply	Response Time	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Inventory (Pcs)
OPB991N11Z	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	954
OPB991L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	926
OPB991L51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	2283
OPB991L55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	1193
OPB991P11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	1025
OPB991P51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	1742
OPB991T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	2671
OPB991T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	5218
OPB991T55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	4526

Engineering Selection Recommendations

The OPB991N11Z is obsolete; direct replacement with active-status equivalents is necessary for new production and ongoing system support. All listed substitute parts maintain full electrical and mechanical compatibility with identical performance characteristics across the specified operating range.

For new designs and legacy system maintenance, OPB991T51Z offers the highest inventory availability (5218 units) while maintaining all specified parameters. OPB991T11Z and OPB991T55Z provide alternative active-status options with substantial stock levels (2671 and 4526 units respectively).

All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for industrial and commercial applications. Wire lead packaging and chassis mount configuration remain consistent across all variants, ensuring mechanical compatibility with existing mechanical assemblies and PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can OPB991N11Z be directly replaced with any of the listed substitute parts?

A: Yes. All substitute parts share identical electrical specifications (4.5V ~ 16V supply, 12 mA current, 70ns response time), mechanical configuration (chassis mount, module with wire leads), and sensing characteristics (through-beam, 0.125" distance, NPN open collector output). Direct substitution is functionally equivalent at the circuit level.

Q: What is the difference between OPB991N11Z and the active-status alternatives?

A: The primary difference is product status. OPB991N11Z is classified as obsolete, while all listed substitutes are active products. Electrical and mechanical parameters are identical. The part number suffix variations (L, P, T series) and packaging designations reflect manufacturing or distribution variants without affecting functional performance.

Q: Are there any compatibility concerns with wire lead connections?

A: No. All parts in this family use identical module wire lead packaging and chassis mount configuration. Existing wire harnesses, connectors, and PCB footprints designed for OPB991N11Z are compatible with all substitute parts without modification.

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

A: Selection should prioritize active-status parts with adequate inventory availability. OPB991T51Z, OPB991T11Z, and OPB991T55Z offer the highest stock levels and are recommended for new designs requiring long-term supply assurance.

Q: Do all substitute parts meet the same regulatory compliance standards?

A: Yes. All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements for industrial applications.

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