OP145A Infrared Emitter 935nm Equivalent & Substitute Parts

Part Overview

The OP145A is an infrared (IR) emitter operating at 935nm wavelength, rated for 50mA DC forward current with a forward voltage of 1.6V typical. This radial through-hole component delivers 0.4mW/cm² radiant intensity at 20mA with a 40° viewing angle, designed for side-view orientation across an operating temperature range of -40°C to 100°C. The OP145A is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity.

Substiute Parts

OP145A

TT Electronics/Optek TechnologyIn Stock: 1151OP145A Datasheet

Current PartRFQ

OP140A

TT Electronics/Optek TechnologyIn Stock: 1427OP140A Datasheet

DirectRFQ

OP145C

TT Electronics/Optek TechnologyIn Stock: 881OP145C Datasheet

MFR RecommendedRFQ

QEE113

onsemiIn Stock: 569761QEE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OP145A is determined by the following critical parameters: wavelength (935nm), maximum DC forward current (50mA), forward voltage (1.6V typical), mounting type (through hole radial), and operating temperature range (-40°C to 100°C). The radiant intensity specification and viewing angle are secondary parameters that may vary within acceptable application tolerances.

Two substitute parts are identified:

OP140A (Direct Substitute): Manufactured by TT Electronics/Optek Technology, this part matches all primary electrical and mechanical parameters of the OP145A. The OP140A is active in production status and maintains identical wavelength (935nm), current rating (50mA), forward voltage (1.6V), radiant intensity (0.4mW/cm² @ 20mA), viewing angle (40°), and thermal operating range. Packaging differs only in format (bulk versus original packaging).

OP145C (Manufacturer Recommended Substitute): Also from TT Electronics/Optek Technology, the OP145C shares wavelength (935nm), current rating (50mA), forward voltage (1.6V), viewing angle (40°), and thermal range with the OP145A. The radiant intensity specification is reduced to 0.2mW/cm² @ 20mA, representing a lower output intensity variant within the same product family.

QEE113 (Cross-Manufacturer Substitute): Manufactured by onsemi, this part operates at 940nm wavelength (5nm offset from 935nm) with matching 50mA current rating. Forward voltage is 1.5V (0.1V lower than OP145A). Radiant intensity is specified as 3mW/sr @ 100mA (different measurement basis). Viewing angle is 50° (10° wider than OP145A). All parts maintain through-hole radial mounting and -40°C to 100°C operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

OP140A is the primary substitute for OP145A applications. This part maintains complete electrical and mechanical compatibility with identical wavelength, current, voltage, radiant intensity, and viewing angle specifications. OP140A is active in production status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant and carry identical thermal operating ranges.

OP145C serves as an alternative within the TT Electronics/Optek Technology product family. This part is suitable for applications where reduced radiant intensity (0.2mW/cm² @ 20mA versus 0.4mW/cm²) is acceptable. OP145C maintains all other critical parameters and is active in production.

QEE113 from onsemi is a cross-manufacturer option for applications tolerant of wavelength variation (940nm versus 935nm), slightly lower forward voltage (1.5V versus 1.6V), and wider viewing angle (50° versus 40°). The radiant intensity specification uses different measurement units (mW/sr @ 100mA), requiring application-specific evaluation. QEE113 is active in production with substantial inventory availability.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, supporting regulatory requirements equivalent to the OP145A.

Frequently Asked Questions (FAQ)

Q: Can OP140A directly replace OP145A in existing designs?

A: Yes. OP140A matches all primary electrical specifications (935nm wavelength, 50mA current, 1.6V forward voltage, 0.4mW/cm² radiant intensity, 40° viewing angle) and mechanical parameters (through-hole radial mounting, -40°C to 100°C operating range) of the OP145A. The only difference is packaging format.

Q: What is the key difference between OP145A and OP145C?

A: Both parts operate at 935nm with 50mA current and 1.6V forward voltage. OP145C has reduced radiant intensity at 0.2mW/cm² @ 20mA compared to OP145A's 0.4mW/cm² @ 20mA. OP145C is suitable for applications where lower output intensity is acceptable or preferred.

Q: Is QEE113 compatible with OP145A applications?

A: QEE113 shares the 50mA current rating and through-hole radial mounting with OP145A. However, it operates at 940nm (5nm longer wavelength), has 1.5V forward voltage (0.1V lower), and 50° viewing angle (10° wider). Applications sensitive to wavelength or viewing angle specifications require evaluation before substitution.

Q: Why is OP145A listed as obsolete?

A: OP145A is no longer in active production. OP140A and OP145C are active alternatives from the same manufacturer, ensuring design continuity and supply availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. OP140A, OP145C, and QEE113 are all ROHS3 compliant, matching the regulatory status of the OP145A.

Q: What inventory status should I consider for production planning?

A: OP140A has 1370 pcs in stock, OP145C has 792 pcs, and QEE113 has 569700 pcs available. QEE113 offers significantly higher inventory depth for high-volume applications.