OPB491P11Z Equivalent & Substitute Parts

Part Overview

The OPB491P11Z is a through-beam optical sensor from TT Electronics/Optek Technology's Photologic® series, designed for 0.125" (3.18mm) sensing distance applications. This component features NPN open collector output with buffer configuration and is housed in a module with wire leads for chassis mount installation. The part is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring compatible through-beam optical sensing functionality.

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	7.5 mA
Response Time	50ns
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Chassis Mount
Package Type	Module, Wire Leads

Substitute Part Grouping Explanation

Substitution eligibility for the OPB491P11Z is determined by strict equivalence across the following critical parameters: sensing distance (0.125"), sensing method (through-beam), output configuration (NPN open collector with buffer), supply voltage range (4.5V ~ 16V), current consumption (7.5 mA), response time (50ns), and operating temperature range (-40°C ~ 85°C).

The substitute parts are grouped into two categories based on mounting configuration:

Wire Lead Module Substitutes (Chassis Mount): OPB481T11Z, OPB481L11Z, OPB491T11Z, and OPB491L11Z maintain identical electrical specifications and wire lead packaging, differing only in internal component variants (indicated by the T/L suffix designations). These are direct functional equivalents for applications requiring the same form factor.

PCB Mount Alternative: OPB471N11 provides electrical equivalence but uses through-hole PCB mounting instead of chassis mount wire leads. This substitute is applicable only when PCB-mounted installation is acceptable in the target application.

Parameter Comparison

Parameter	OPB491P11Z	OPB481T11Z	OPB481L11Z	OPB491T11Z	OPB491L11Z	OPB471N11
Sensing Distance	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)
Sensing Method	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam
Output Configuration	NPN - Open Collector, Buffer	NPN - Open Collector, Buffer	NPN - Open Collector, Buffer	NPN - Open Collector, Buffer	NPN - Open Collector, Buffer	NPN - Open Collector, Buffer
Voltage Supply	4.5V ~ 16V	4.5V ~ 16V	4.5V ~ 16V	4.5V ~ 16V	4.5V ~ 16V	4.5V ~ 16V
Current Supply	7.5 mA	7.5 mA	7.5 mA	7.5 mA	7.5 mA	7.5 mA
Response Time	50ns	50ns	50ns	50ns	50ns	50ns
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Through Hole
Package Type	Module, Wire Leads	Module, Wire Leads	Module, Wire Leads	Module, Wire Leads	Module, Wire Leads	PCB Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete OPB491P11Z with chassis mount wire lead requirements, OPB481T11Z, OPB481L11Z, OPB491T11Z, and OPB491L11Z are direct active substitutes. All five wire lead variants maintain identical electrical performance and thermal operating ranges while offering current production availability.

OPB471N11 serves as an electrical equivalent for designs where PCB-mounted installation can replace the original chassis mount configuration. This substitute is suitable for new designs or system redesigns that accommodate through-hole PCB mounting.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original component. Selection between wire lead variants should be based on internal component specifications (T/L designations) required by the target application circuit.

Frequently Asked Questions (FAQ)

Q: Can OPB471N11 be used as a direct replacement for OPB491P11Z in existing assemblies?

A: OPB471N11 is electrically equivalent but uses through-hole PCB mounting instead of chassis mount wire leads. Direct substitution is possible only if the assembly can accommodate PCB-mounted installation. Mechanical redesign of the mounting interface is required for applications currently using wire lead chassis mount configurations.

Q: What is the difference between OPB481 and OPB491 series substitutes?

A: Both OPB481 and OPB491 series maintain identical electrical specifications, sensing distance, output configuration, and operating parameters. The series designation difference reflects internal component variants. Selection should be based on specific circuit requirements for the T or L suffix variant needed.

Q: Are all substitute parts currently in production?

A: Yes. OPB481T11Z, OPB481L11Z, OPB491T11Z, OPB491L11Z, and OPB471N11 are all active production parts. The original OPB491P11Z is obsolete, making these substitutes necessary for ongoing support.

Q: Do the substitute parts maintain the same electrical performance as OPB491P11Z?

A: All wire lead substitutes (OPB481T11Z, OPB481L11Z, OPB491T11Z, OPB491L11Z) maintain identical voltage supply range, current consumption, response time, and operating temperature specifications. OPB471N11 provides the same electrical performance with different mechanical packaging.

Q: What compliance certifications apply to the substitute parts?

A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original OPB491P11Z component.

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