OPB991P11Z Equivalent & Substitute Parts

Part Overview

The OPB991P11Z is an optical sensor manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This through-beam optical sensor operates at a 0.125" (3.18mm) sensing distance and features NPN open collector output with buffer configuration. The part is Active status and ROHS3 compliant. Substitute parts are necessary to address inventory availability, lead time constraints, or specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
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 Type	Module, Wire Leads
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

All substitute parts for the OPB991P11Z maintain identical electrical and mechanical specifications. Substitution is based on the following criteria:

Identical sensing distance: 0.125" (3.18mm)
Identical sensing method: Through-Beam
Identical output configuration: NPN - Open Collector, Buffer
Identical voltage supply range: 4.5V ~ 16V
Identical current supply: 12 mA
Identical response time: 70ns
Identical operating temperature range: -40°C ~ 70°C
Identical mounting type: Chassis Mount
Identical package type: Module, Wire Leads
Identical compliance certifications: ROHS3, REACH Unaffected

The substitute parts differ only in internal optical configuration or lens type, which do not affect the electrical interface or functional performance in applications requiring the specified sensing parameters.

Parameter Comparison

Part Number	Manufacturer	Series	Sensing Distance	Sensing Method	Output Configuration	Voltage Supply	Current Supply	Response Time	Operating Temperature	Mounting Type	Package Type	RoHS Status	Inventory (Pcs)
OPB991P11Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	1025
OPB991L11Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	Through-Beam	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	Photologic®	0.125" (3.18mm)	Through-Beam	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	Photologic®	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant	1193
OPB991P51Z	TT Electronics/Optek Technology	Photologic®	0.125" (3.18mm)	Through-Beam	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	Photologic®	0.125" (3.18mm)	Through-Beam	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	Photologic®	0.125" (3.18mm)	Through-Beam	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	Photologic®	0.125" (3.18mm)	Through-Beam	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

All substitute parts listed are Active status products from TT Electronics/Optek Technology and maintain ROHS3 compliance and REACH unaffected status. Selection among OPB991P11Z, OPB991L11Z, OPB991L51Z, OPB991L55Z, OPB991P51Z, OPB991T11Z, OPB991T51Z, and OPB991T55Z is determined by inventory availability and lead time requirements. Each part is electrically and mechanically interchangeable within applications designed for the OPB991 base product number with the specified 0.125" (3.18mm) through-beam sensing configuration.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically interchangeable with the OPB991P11Z?

A: Yes. All substitute parts share identical electrical specifications including voltage supply range (4.5V ~ 16V), current supply (12 mA), response time (70ns), and NPN open collector output configuration.

Q: What determines compatibility between OPB991P11Z and its substitutes?

A: Compatibility is determined by matching sensing distance (0.125" / 3.18mm), sensing method (through-beam), output configuration (NPN - open collector, buffer), operating temperature range (-40°C ~ 70°C), and package type (module with wire leads). All listed parts meet these criteria.

Q: Can I use OPB991T51Z as a direct replacement for OPB991P11Z?

A: Yes. OPB991T51Z maintains all electrical and mechanical parameters required for direct substitution in applications designed for OPB991P11Z.

Q: Are there any compliance differences between the main part and substitutes?

A: No. All parts carry identical RoHS3 compliance, REACH unaffected status, MSL rating of 1 (unlimited), and ECCN/HTSUS classifications.

Q: What is the difference between the various OPB991 variants?

A: The variants (L, P, T designations and 11, 51, 55 suffixes) represent different internal optical configurations or lens types. These differences do not affect the electrical interface or the specified sensing distance and performance parameters.

Q: Which substitute part has the highest current inventory?

A: OPB991T51Z has the highest inventory at 5218 pieces.

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