OPB491T11 Equivalent & Substitute Parts

Part Overview

The OPB491T11 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 module wire lead packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The OPB491T11 operates with NPN open collector buffer output, supporting applications requiring reliable through-beam optical detection across industrial temperature ranges.

Substiute Parts

OPB491T11

TT Electronics/Optek TechnologyIn Stock: 830OPB491T11 Datasheet

Current PartRFQ

OPB491T11Z

TT Electronics/Optek TechnologyIn Stock: 899OPB491T11Z Datasheet

DirectRFQ

OPB461L11

TT Electronics/Optek TechnologyIn Stock: 944OPB461L11 Datasheet

MFR RecommendedRFQ

OPB461T11

TT Electronics/Optek TechnologyIn Stock: 718OPB461T11 Datasheet

MFR RecommendedRFQ

OPB471L11

TT Electronics / Optek TechnologyIn Stock: 830OPB471L11 Datasheet

MFR RecommendedRFQ

OPB481L11Z

TT Electronics/Optek TechnologyIn Stock: 3140OPB481L11Z Datasheet

MFR RecommendedRFQ

OPB481T11Z

TT Electronics/Optek TechnologyIn Stock: 1183OPB481T11Z Datasheet

MFR RecommendedRFQ

OPB491L11Z

TT Electronics/Optek TechnologyIn Stock: 848OPB491L11Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OPB491T11 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• 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

Packaging Consideration: The OPB491T11 uses module wire lead packaging for chassis mount applications. Direct substitutes maintain this packaging type. Alternative mounting configurations (PCB mount through-hole) represent functional equivalents with different mechanical integration requirements.

Substitute Categories:

1. Direct Substitutes (Module, Wire Leads - Chassis Mount): OPB491T11Z, OPB481T11Z, OPB481L11Z
2. Functional Equivalents (PCB Mount - Through Hole): OPB461T11, OPB461L11, OPB471L11

All substitute parts maintain identical electrical specifications and operating parameters as the OPB491T11.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Chassis Mount, Wire Leads):

OPB491T11Z, OPB491L11Z, OPB481T11Z, and OPB481L11Z are direct electrical and mechanical substitutes for the obsolete OPB491T11. All active substitutes are ROHS3 compliant, addressing regulatory requirements where the original part is non-compliant. OPB491T11Z maintains the closest part number lineage and is recommended as the primary replacement for existing designs using OPB491T11.

For PCB-Integrated Designs (Through-Hole Mount):

OPB461T11, OPB461L11, and OPB471L11 provide functional equivalence with identical electrical performance but require PCB through-hole mounting instead of chassis mounting. These parts are suitable for designs where PCB integration is preferred or where chassis mount configurations are not feasible. All three maintain active product status and ROHS3 compliance.

Compliance Consideration:

The original OPB491T11 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, making them suitable for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can OPB491T11Z be used as a direct replacement for OPB491T11?

A: Yes. OPB491T11Z is electrically and mechanically identical to OPB491T11, with the primary difference being active product status and ROHS3 compliance. Both use module wire lead packaging for chassis mount applications.

Q: What is the difference between OPB491T11Z and OPB481T11Z?

A: Both parts share identical electrical specifications and packaging. The difference lies in the base product number (OPB491 versus OPB481), which reflects different product lines within the Photologic® series. Both are functionally equivalent for through-beam optical sensing applications.

Q: Can I use OPB461T11 or OPB471L11 in place of OPB491T11?

A: These parts are functional equivalents with identical electrical performance but differ in mounting configuration. OPB461T11 and OPB471L11 use PCB through-hole mounting, while OPB491T11 uses chassis mount wire leads. Substitution requires mechanical redesign to accommodate the different mounting type.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (OPB491T11Z, OPB491L11Z, OPB481T11Z, OPB481L11Z, OPB461T11, OPB461L11, OPB471L11) are ROHS3 compliant. The original OPB491T11 is RoHS non-compliant.

Q: What parameters must remain constant when selecting a substitute?

A: Sensing distance (0.125"), sensing method (through-beam), output configuration (NPN open collector buffer), voltage range (4.5V ~ 16V), current draw (7.5 mA), response time (50ns), and operating temperature range (-40°C ~ 85°C) must all remain unchanged for functional equivalence.

Q: Does the packaging type affect electrical performance?

A: No. Module wire leads (chassis mount) and PCB mount through-hole configurations deliver identical electrical performance. The packaging type affects only mechanical integration and board layout considerations.