OP145D Infrared Emitter - Equivalent & Substitute Parts

Part Overview

The OP145D is an infrared (IR) emitter operating at 935nm wavelength, designed for through-hole radial mounting applications. Manufactured by TT Electronics/Optek Technology, this component delivers 50mA maximum forward current with a 1.6V typical forward voltage and 40° viewing angle. The OP145D is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications.

Substiute Parts

OP145D

TT Electronics/Optek TechnologyIn Stock: 819OP145D Datasheet

Current PartRFQ

OP140C

TT Electronics/Optek TechnologyIn Stock: 4781OP140C Datasheet

MFR RecommendedRFQ

QEE113

onsemiIn Stock: 569761QEE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OP145D is determined by the following critical parameters: wavelength (935nm), maximum forward current (50mA), forward voltage (1.6V typical), viewing angle (40°), mounting type (through hole radial), and operating temperature range (-40°C ~ 100°C). The substitute parts identified maintain compatibility across these core electrical and mechanical specifications while meeting current product availability and compliance requirements.

OP140C (TT Electronics/Optek Technology) qualifies as a direct substitute, maintaining identical wavelength (935nm), forward current (50mA), forward voltage (1.6V), viewing angle (40°), and mounting configuration. The primary difference is increased radiant intensity (0.2mW/cm² @ 20mA versus 0.1mW/cm²), which represents improved performance within the same electrical envelope.

QEE113 (onsemi) operates at 940nm wavelength with 50mA maximum forward current and 1.5V typical forward voltage. The 5nm wavelength variance and 50° viewing angle (versus 40°) represent minor deviations within the near-infrared spectrum. The radiant intensity specification differs in measurement methodology (3mW/sr @ 100mA) but indicates comparable optical output capability.

Parameter Comparison

Engineering Selection Recommendations

OP140C is the primary substitute for OP145D applications. Both components are manufactured by TT Electronics/Optek Technology, share identical electrical specifications (50mA, 1.6V, 935nm), and maintain the same mechanical form factor. OP140C is currently in active production status with significantly higher inventory availability (4762 pcs versus 718 pcs for OP145D). The increased radiant intensity (0.2mW/cm² @ 20mA) provides enhanced optical performance without requiring circuit modifications.

QEE113 serves as an alternative substitute for applications where minor wavelength and viewing angle variations are acceptable. The 940nm wavelength represents a 5nm shift from the OP145D specification, and the 50° viewing angle provides a 10° increase in beam divergence. The 1.5V forward voltage is 0.1V lower than OP145D, which may require circuit evaluation in current-limited designs. QEE113 demonstrates exceptional inventory availability (569700 pcs) and active product status from onsemi.

Both substitute parts maintain full RoHS3 compliance, REACH unaffected status, and EAR99 export classification consistent with the original OP145D specification.

Frequently Asked Questions (FAQ)

Q: Can OP140C be used as a direct replacement for OP145D without circuit modifications?

A: Yes. OP140C maintains identical electrical parameters (50mA maximum forward current, 1.6V typical forward voltage, 935nm wavelength) and mechanical configuration (through-hole radial package, 40° viewing angle). The increased radiant intensity represents improved performance within the same electrical envelope.

Q: What is the significance of the wavelength difference between OP145D (935nm) and QEE113 (940nm)?

A: The 5nm wavelength difference places both components within the near-infrared spectrum. Applications requiring precise wavelength matching should evaluate system sensitivity. QEE113 operates at a slightly longer wavelength, which may affect receiver response depending on photodiode or phototransistor spectral characteristics.

Q: How do the viewing angles of OP140C (40°) and QEE113 (50°) affect application compatibility?

A: OP140C maintains the original 40° viewing angle of OP145D, ensuring identical beam divergence characteristics. QEE113's 50° viewing angle provides broader light distribution, which may be advantageous for applications requiring wider coverage but may reduce intensity at specific angles.

Q: Are there forward voltage considerations when substituting QEE113 (1.5V) for OP145D (1.6V)?

A: The 0.1V difference is minor but should be evaluated in current-limited circuit designs. Applications using series resistors or constant-current sources will experience slightly different operating points. Verify that the reduced forward voltage does not cause excessive forward current in the application circuit.

Q: What inventory considerations should guide substitute part selection?

A: OP140C offers 4762 pcs availability from TT Electronics/Optek Technology, while QEE113 provides 569700 pcs from onsemi. Both represent active products with established supply chains, contrasting with the obsolete OP145D status.