OPB491T11Z Equivalent & Substitute Parts

Part Overview

The OPB491T11Z is an optical sensor manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This through-beam optical sensor features a 0.125" (3.18mm) sensing distance and is supplied with wire leads for chassis mount applications. The component operates across a wide voltage range of 4.5V to 16V with NPN open collector buffer output configuration. As an active product with full RoHS3 compliance and unlimited moisture sensitivity rating, the OPB491T11Z remains in production. Substitute parts are identified to support inventory management, supply chain continuity, and application flexibility where equivalent electrical and mechanical specifications are maintained.

Substiute Parts

OPB491T11Z

TT Electronics/Optek TechnologyIn Stock: 899OPB491T11Z Datasheet

Current PartRFQ

OPB481L11Z

TT Electronics/Optek TechnologyIn Stock: 3140OPB481L11Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPB491T11Z are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

• Identical sensing distance: 0.125" (3.18mm)
• Identical sensing method: Through-Beam
• Identical output configuration: NPN - Open Collector, Buffer
• Identical voltage supply range: 4.5V ~ 16V
• Identical current supply: 7.5 mA
• Identical response time: 50ns
• Identical operating temperature range: -40°C ~ 85°C
• Identical mounting type: Chassis Mount
• Identical package type: Module, Wire Leads
• Identical compliance certifications: RoHS3, REACH Unaffected

The OPB481L11Z meets all these criteria and is classified as a manufacturer-recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the OPB491T11Z and OPB481L11Z are active products within the Photologic® series from TT Electronics/Optek Technology. Selection between these parts is based on availability and supply chain considerations rather than functional differences. Both components carry identical electrical specifications, mechanical configurations, and regulatory compliance certifications. The OPB481L11Z currently maintains higher inventory availability (3099 pcs vs. 863 pcs), making it suitable for high-volume applications or extended lead-time mitigation. Both parts satisfy RoHS3 compliance requirements and carry REACH Unaffected status, supporting use in regulated markets and applications with environmental compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can OPB481L11Z be used as a direct replacement for OPB491T11Z?

A: Yes. Both parts are electrically and mechanically equivalent across all specified parameters, including sensing distance, output configuration, voltage and current ratings, response time, and operating temperature range. Both are housed in identical module packages with wire leads and support chassis mount installation.

Q: Are there differences in sensing performance between these parts?

A: No. Both parts share identical sensing distance (0.125" / 3.18mm), sensing method (through-beam), response time (50ns), and operating temperature range (-40°C ~ 85°C).

Q: Do both parts meet the same compliance standards?

A: Yes. Both OPB491T11Z and OPB481L11Z are RoHS3 compliant, REACH unaffected, carry MSL rating 1 (unlimited), and share the same ECCN (EAR99) and HTSUS classification (8541.49.8000).

Q: What is the difference between the base product numbers OPB491 and OPB481?

A: The base product numbers indicate different part families within the Photologic® series. However, the specific variants OPB491T11Z and OPB481L11Z are functionally equivalent when all electrical and mechanical parameters are identical.

Q: Are there inventory considerations when selecting between these parts?

A: Yes. The OPB481L11Z has significantly higher current inventory (3099 pcs) compared to the OPB491T11Z (863 pcs). For applications requiring immediate availability or bulk quantities, the OPB481L11Z may offer supply chain advantages.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. Since both parts are identical in electrical specifications, output configuration, package type, and mounting requirements, they can be used interchangeably without design modifications.