OPB991P11 Equivalent & Substitute Parts

Part Overview

The OPB991P11 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 with NPN open collector buffer output configuration. The OPB991P11 is classified as obsolete product status. Due to its obsolescence, equivalent substitute parts from the active OPB991 product line are available to maintain design continuity and ensure supply chain reliability.

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
Voltage - Supply	4.5V ~ 16V
Current - Supply	12 mA
Response Time	70ns
Operating Temperature	-40°C ~ 70°C
Package / Case	Module, Wire Leads
Base Product Number	OPB991

Substitute Part Grouping Explanation

All substitute parts for OPB991P11 are derived from the OPB991 base product family and maintain identical electrical and mechanical specifications. Substitution is valid based on the following criteria:

Electrical Parameters (Must Match):

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-Beam
Output configuration: NPN - Open Collector, Buffer
Supply voltage range: 4.5V ~ 16V
Supply current: 12 mA
Response time: 70ns

Mechanical Parameters (Must Match):

Mounting type: Chassis Mount
Package type: Module, Wire Leads
Operating temperature range: -40°C ~ 70°C

Compliance Parameters:

RoHS Status: ROHS3 Compliant (all active substitutes)
Moisture Sensitivity Level: 1 (Unlimited)
REACH Status: REACH Unaffected
ECCN: EAR99
HTSUS: 8541.49.8000

The OPB991P11 differs from active substitutes only in product status (obsolete vs. active) and RoHS compliance classification. All substitute parts are functionally and mechanically interchangeable.

Parameter Comparison

Part Number	Manufacturer	Product Status	RoHS Status	Sensing Distance	Output Configuration	Supply Voltage	Supply Current	Response Time	Operating Temperature	Inventory (Pcs)
OPB991P11	TT Electronics/Optek Technology	Obsolete	RoHS non-compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	1053
OPB991P11Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	1025
OPB991L11Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	926
OPB991L51Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	2283
OPB991L55Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	1193
OPB991P51Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	1742
OPB991T11Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	2671
OPB991T51Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	5218
OPB991T55Z	TT Electronics/Optek Technology	Active	ROHS3 Compliant	0.125" (3.18mm)	NPN - Open Collector, Buffer	4.5V ~ 16V	12 mA	70ns	-40°C ~ 70°C	4526

Engineering Selection Recommendations

For new designs and production applications, select from the active OPB991 product line substitutes. All listed alternatives maintain full electrical and mechanical compatibility with OPB991P11 while offering active product status and ROHS3 compliance.

OPB991P11Z provides the closest direct substitution with identical part designation structure and active status. For applications requiring maximum inventory availability, OPB991T51Z offers the highest stock level at 5218 units. OPB991T55Z provides the second-highest availability at 4526 units.

All substitute parts are manufactured by TT Electronics/Optek Technology and carry identical certifications: REACH Unaffected, ECCN EAR99, and HTSUS 8541.49.8000.

Frequently Asked Questions (FAQ)

Q: Can OPB991P11 be directly replaced with OPB991P11Z?

A: Yes. OPB991P11Z is the direct active equivalent with identical electrical specifications, sensing distance, output configuration, and mechanical mounting. The primary difference is product status (active vs. obsolete) and RoHS compliance classification.

Q: What determines compatibility between OPB991P11 and other OPB991 variants?

A: Compatibility is determined by matching electrical parameters (sensing distance, output type, supply voltage/current, response time) and mechanical parameters (mounting type, package configuration, operating temperature range). All listed substitutes maintain these specifications identically.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use Module, Wire Leads packaging in bulk configuration. The OPB991P11 original part does not specify packaging type, while all active substitutes are supplied in bulk packaging.

Q: Which substitute part has the best availability?

A: OPB991T51Z has the highest inventory at 5218 units, followed by OPB991T55Z at 4526 units. Both are active products with ROHS3 compliance.

Q: Is RoHS compliance a functional requirement for substitution?

A: RoHS compliance is a regulatory and supply chain consideration. The OPB991P11 is RoHS non-compliant, while all active substitutes are ROHS3 compliant. For applications subject to RoHS regulations, active substitutes are required.

Q: Do all substitute parts operate at the same supply voltage and current?

A: Yes. All substitute parts operate at 4.5V to 16V supply voltage with 12 mA supply current, matching the OPB991P11 specifications exactly.

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