OP145B Infrared Emitter - Equivalent & Substitute Parts

Part Overview

The OP145B is an infrared (IR) emitter manufactured by TT Electronics/Optek Technology, designed for applications requiring 935nm wavelength emission at 50mA maximum forward current. This component operates across an industrial temperature range of -40°C to 100°C and features a 40° viewing angle in a radial through-hole package configuration.

The OP145B is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this emitter specification remains functionally required.

Substiute Parts

OP145B

TT Electronics/Optek TechnologyIn Stock: 1111OP145B Datasheet

Current PartRFQ

QEE113

onsemiIn Stock: 569761QEE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OP145B is determined by the following critical parameters:

• Wavelength compatibility: The substitute must operate within the near-infrared spectrum suitable for the application. The OP145B operates at 935nm; acceptable substitutes may operate at adjacent wavelengths (such as 940nm) where system photodetectors and optical filters are designed to accept this range.
• Forward current rating: The substitute must support the same maximum DC forward current (50mA) to ensure compatibility with existing drive circuitry.
• Forward voltage: The substitute forward voltage must be compatible with the power supply and current-limiting circuit design.
• Mounting and package type: The substitute must use through-hole radial packaging to ensure mechanical compatibility with existing PCB layouts.
• Operating temperature range: The substitute must support the full industrial temperature range (-40°C to 100°C) required by the application.
• Compliance certifications: The substitute must maintain RoHS3 compliance and REACH compliance status.

The QEE113 meets these substitution criteria across all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The QEE113 is the manufacturer-recommended substitute for the OP145B. Both components maintain ROHS3 compliance and REACH compliance status, ensuring regulatory alignment for new production and replacement applications.

The QEE113 is currently in active production status, providing assured long-term component availability compared to the obsolete OP145B. The QEE113 operates at 940nm wavelength, which is within the near-infrared spectrum adjacent to the OP145B's 935nm specification. Both components share identical maximum forward current ratings (50mA) and identical operating temperature ranges (-40°C to 100°C), ensuring compatibility with existing drive circuitry and thermal management designs.

The QEE113 features a slightly lower typical forward voltage (1.5V versus 1.6V) and a wider viewing angle (50° versus 40°), both of which are compatible with applications designed for the OP145B. The radiant intensity specifications are measured under different conditions (3mW/sr @ 100mA for QEE113 versus 0.3mW/cm² @ 20mA for OP145B) and reflect different measurement methodologies; both components are suitable for infrared detection and signaling applications.

Frequently Asked Questions (FAQ)

Q: Can the QEE113 directly replace the OP145B in existing designs?

A: Yes. Both components are through-hole radial infrared emitters with identical maximum forward current (50mA), identical operating temperature range (-40°C to 100°C), and compatible forward voltage characteristics. The QEE113 operates at 940nm wavelength, which is within the near-infrared spectrum and compatible with photodetector and optical filter designs specified for 935nm operation.

Q: What is the difference in wavelength between the OP145B and QEE113?

A: The OP145B operates at 935nm, while the QEE113 operates at 940nm. This 5nm difference is within the near-infrared spectrum and is typically acceptable for applications where the photodetector and optical filtering are designed for broadband near-infrared detection in the 930-950nm range.

Q: Are both components RoHS and REACH compliant?

A: Yes. Both the OP145B and QEE113 are ROHS3 compliant and REACH compliant, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the product availability status of each component?

A: The OP145B is classified as obsolete and has limited inventory availability (1009 pieces). The QEE113 is in active production status with substantial inventory availability (569,700 pieces), making it the preferred choice for new designs and ongoing production requirements.

Q: Are there any differences in package or mounting between these components?

A: Both components use through-hole radial packaging with side-view orientation. The physical mounting compatibility is identical, allowing direct PCB layout substitution without redesign.