OPB491L11 Equivalent & Substitute Parts

Part Overview

The OPB491L11 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 for chassis mount applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The OPB491L11 operates with NPN open collector buffer output, 7.5 mA supply current, and supports voltage supplies from 4.5V to 16V with a 50ns response time across an operating temperature range of -40°C to 85°C. The part is RoHS non-compliant and carries REACH unaffected status.

Substiute Parts

OPB491L11

TT Electronics/Optek TechnologyIn Stock: 1043OPB491L11 Datasheet

Current PartRFQ

OPB491L11Z

TT Electronics/Optek TechnologyIn Stock: 848OPB491L11Z 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

OPB491T11Z

TT Electronics/Optek TechnologyIn Stock: 899OPB491T11Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OPB491L11 is determined by strict equivalence across the following critical parameters: sensing distance (0.125" / 3.18mm), sensing method (through-beam), output configuration (NPN open collector buffer), supply voltage range (4.5V ~ 16V), supply current (7.5 mA), response time (50ns), and operating temperature range (-40°C ~ 85°C).

Substitute parts are grouped into two categories based on packaging:

Category 1: Module Wire Leads (Chassis Mount) – Direct functional equivalents with identical mounting type and package configuration. These parts maintain the same electrical and mechanical interface as the OPB491L11.

Category 2: PCB Mount (Through Hole) – Functional equivalents with different mounting type and package configuration. These parts share all electrical specifications but require different board-level integration.

All substitute parts listed are from the Photologic® series and maintain compatibility with the original electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Module Wire Leads - Chassis Mount):

OPB491L11Z, OPB491T11Z, OPB481L11Z, and OPB481T11Z are direct functional equivalents with identical mounting type and package configuration. All four parts are active products with ROHS3 compliance, providing modern alternatives to the obsolete OPB491L11. OPB491L11Z is the closest variant, maintaining the same base product number (OPB491) with updated RoHS compliance.

Secondary Substitutes (PCB Mount - Through Hole):

OPB461L11, OPB461T11, and OPB471L11 are functional equivalents with different mounting type (through hole PCB mount) and package configuration. These parts maintain all electrical specifications but require board-level integration changes. All three are active products with ROHS3 compliance.

Selection between primary and secondary substitutes depends on mechanical integration requirements. Primary substitutes maintain the original chassis mount wire lead interface. Secondary substitutes require PCB mount through-hole integration.

Frequently Asked Questions (FAQ)

Q: Can OPB491L11Z be used as a direct replacement for OPB491L11?

A: Yes. OPB491L11Z maintains identical electrical specifications, sensing distance, output configuration, supply voltage and current, response time, and operating temperature range. The primary difference is RoHS compliance status (ROHS3 compliant versus non-compliant) and active product status versus obsolete status. Mechanical interface and package configuration are identical.

Q: What is the difference between OPB491L11Z and OPB481L11Z?

A: Both parts share identical electrical specifications, sensing distance, output configuration, supply voltage and current, response time, and operating temperature range. The difference is the base product number (OPB491 versus OPB481), which may indicate internal design variations within the Photologic® series. Both are active products with ROHS3 compliance and module wire lead packaging.

Q: Can PCB mount variants (OPB461L11, OPB461T11, OPB471L11) replace the OPB491L11?

A: PCB mount variants are functionally equivalent in electrical specifications but differ in mounting type and package configuration. OPB491L11 uses chassis mount wire leads, while OPB461 and OPB471 series use through-hole PCB mount. Selection depends on mechanical integration requirements. If the application requires chassis mount wire leads, use primary substitutes. If PCB mount through-hole integration is acceptable, PCB mount variants are suitable.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original OPB491L11 is RoHS non-compliant. If RoHS compliance is required for the application, all listed substitutes meet this requirement.

Q: What is the difference between OPB491T11Z and OPB491L11Z?

A: Both parts share identical electrical specifications, sensing distance, output configuration, supply voltage and current, response time, and operating temperature range. The difference is indicated by the "T" versus "L" designation in the part number, which may indicate internal design variations within the OPB491 base product. Both are active products with ROHS3 compliance and module wire lead packaging.