OPB481P11Z Equivalent & Substitute Parts

Part Overview

The OPB481P11Z 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 chassis mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The OPB481P11Z maintains core optical sensing functionality through NPN open collector output with buffer configuration, operating across 4.5V to 16V supply voltage and -40°C to 85°C temperature range. Substitute parts are selected based on matching electrical specifications, sensing characteristics, and compliance certifications while accommodating different mounting and packaging options.

Key Parameters

Parameter	Value
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
Output Configuration	NPN - Open Collector, Buffer
Voltage - Supply	4.5V ~ 16V
Current - Supply	7.5 mA
Response Time	50ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Chassis Mount (Wire Leads) / Through Hole (PCB Mount)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for OPB481P11Z is determined by strict equivalence across electrical and optical parameters. All substitute parts maintain identical sensing distance (0.125"), sensing method (through-beam), output configuration (NPN open collector with buffer), supply voltage range (4.5V–16V), supply current (7.5 mA), response time (50ns), and operating temperature range (-40°C to 85°C).

Substitutes are grouped into two categories based on mounting configuration:

Wire Lead Chassis Mount (Direct Equivalents): OPB481T11Z, OPB481L11Z, OPB491T11Z, OPB491L11Z maintain identical module wire lead packaging and chassis mount configuration as the main part.

PCB Mount Alternative: OPB471N11 provides functional equivalence with modified mounting type (through-hole PCB mount instead of chassis mount wire leads), suitable for applications where PCB integration is preferred over chassis mounting.

All substitute parts carry ROHS3 compliance, MSL 1 rating, and REACH unaffected status matching the original part.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	Voltage - Supply	Current - Supply	Response Time	Operating Temperature	Mounting Type	Package / Case	RoHS Status
OPB481P11Z	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	7.5 mA	50ns	-40°C ~ 85°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant
OPB481T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	7.5 mA	50ns	-40°C ~ 85°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant
OPB481L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	7.5 mA	50ns	-40°C ~ 85°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant
OPB491T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	7.5 mA	50ns	-40°C ~ 85°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant
OPB491L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	7.5 mA	50ns	-40°C ~ 85°C	Chassis Mount	Module, Wire Leads	ROHS3 Compliant
OPB471N11	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.5V ~ 16V	7.5 mA	50ns	-40°C ~ 85°C	Through Hole	PCB Mount	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts are active production items from TT Electronics/Optek Technology, providing long-term availability compared to the obsolete OPB481P11Z. Selection between wire lead and PCB mount variants depends on application mounting requirements.

For applications requiring chassis mount configuration with wire leads, OPB481T11Z and OPB481L11Z are direct functional replacements with higher inventory availability (1162 and 3099 units respectively). OPB491T11Z and OPB491L11Z provide equivalent electrical and optical performance within the OPB491 base product line.

For applications where PCB integration is feasible, OPB471N11 offers through-hole PCB mount configuration while maintaining all electrical and optical specifications. This option eliminates external wiring and provides board-level integration.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status, ensuring regulatory and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can OPB481P11Z be directly replaced with OPB481T11Z or OPB481L11Z?

A: Yes. OPB481T11Z and OPB481L11Z are direct electrical and optical equivalents with identical sensing distance, output configuration, supply voltage, current draw, response time, and operating temperature. Both are active production parts with higher inventory availability than the obsolete OPB481P11Z.

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

A: Both OPB481 and OPB491 series maintain identical electrical specifications (4.5V–16V supply, 7.5 mA current, 50ns response time) and optical characteristics (0.125" through-beam sensing). Substitution between series is based on matching these core parameters rather than series designation.

Q: Can OPB471N11 replace OPB481P11Z in existing designs?

A: OPB471N11 provides electrical and optical equivalence but uses through-hole PCB mount packaging instead of chassis mount wire leads. Application redesign is required to accommodate PCB integration. This substitution is suitable only for new designs or applications undergoing board-level redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance, MSL 1 rating, and REACH unaffected status, matching the regulatory profile of OPB481P11Z.

Q: What inventory levels are available for substitute parts?

A: OPB481L11Z has the highest availability at 3099 units. OPB481T11Z provides 1162 units, OPB491T11Z provides 863 units, OPB491L11Z provides 767 units, and OPB471N11 provides 1192 units. All are new original stock.

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