OP145C Infrared Emitter - Equivalent & Substitute Parts

Part Overview

The OP145C 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 is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. The OP145C operates across an industrial temperature range of -40°C to 100°C and is packaged in a radial through-hole configuration for direct PCB integration.

Substitute parts become necessary when addressing supply chain constraints, regional availability limitations, or when design specifications permit operation within the electrical and mechanical tolerances of alternative IR emitters sharing compatible parameters.

Substiute Parts

OP145C

TT Electronics/Optek TechnologyIn Stock: 881OP145C Datasheet

Current PartRFQ

QEE113

onsemiIn Stock: 569761QEE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for IR emitters is determined by alignment across the following critical parameters:

• Wavelength tolerance: 935nm (OP145C) to 940nm (QEE113) represents a 5nm variance within the near-infrared spectrum, acceptable for applications not requiring strict wavelength locking
• Forward current rating: Both parts rated at 50mA maximum, ensuring compatible drive circuit design
• Mounting configuration: Both employ through-hole radial packaging with side-view orientation, permitting direct PCB footprint compatibility
• Operating temperature range: Both support -40°C to 100°C, maintaining thermal envelope equivalence
• Compliance certifications: Both RoHS3 compliant and REACH unaffected, satisfying regulatory requirements

The QEE113 qualifies as a manufacturer-recommended substitute based on these aligned parameters. Differences in forward voltage (1.5V vs 1.6V) and radiant intensity measurement conditions do not preclude substitution when circuit design accommodates these variations.

Parameter Comparison

Engineering Selection Recommendations

Selection between OP145C and QEE113 is determined by the following criteria:

OP145C remains the primary choice when:

• Exact 935nm wavelength specification is required by system design
• Narrower 40° viewing angle matches optical path requirements
• Forward voltage of 1.6V aligns with existing drive circuit design

QEE113 is suitable when:

• 940nm wavelength variance is acceptable within application tolerance
• Wider 50° viewing angle provides design advantage for broader emission coverage
• Forward voltage of 1.5V is compatible with circuit implementation
• Supply availability or cost considerations favor onsemi sourcing

Both parts maintain Active product status, RoHS3 compliance, and identical thermal operating range, supporting direct substitution within the specified parameter boundaries.

Frequently Asked Questions (FAQ)

Q: Can QEE113 replace OP145C in existing designs without circuit modification?

A: Direct substitution is possible if the application tolerates 5nm wavelength variance (935nm to 940nm), 0.1V forward voltage difference (1.6V to 1.5V), and 10° wider viewing angle (40° to 50°). Circuit verification is required to confirm these parameter variations do not impact system performance.

Q: What is the significance of the 5nm wavelength difference between these parts?

A: The wavelength difference from 935nm to 940nm represents a shift within the near-infrared spectrum. Applications using narrowband photodetectors or wavelength-specific optical filters must verify detector response at 940nm before substitution.

Q: Are the radial through-hole packages mechanically identical?

A: Both parts employ radial through-hole packaging with side-view orientation, permitting identical PCB footprint placement. Physical component dimensions should be verified against datasheets for mechanical clearance confirmation.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both OP145C and QEE113 are RoHS3 compliant and REACH unaffected, satisfying equivalent regulatory requirements for industrial and commercial applications.

Q: What is the impact of the 0.1V forward voltage difference on circuit design?

A: The forward voltage difference (1.6V OP145C vs 1.5V QEE113) affects current-limiting resistor calculations in drive circuits. Recalculate series resistor values to maintain target forward current at the substitute part's lower forward voltage to prevent overcurrent conditions.

Q: Can these parts be used interchangeably in high-speed switching applications?

A: Switching performance characteristics are not provided in the specification parameters. Datasheet review of both parts is necessary to confirm switching speed, rise time, and fall time compatibility for high-frequency applications.