OP271 Infrared Emitter 890nm 50mA SMD - Equivalent & Substitute Parts

Part Overview

The OP271 is an infrared (IR) emitter manufactured by TT Electronics/Optek Technology, designed for 890nm wavelength applications with 50mA maximum forward current and 1.5V typical forward voltage. This component is classified as obsolete, necessitating identification of active substitute parts that maintain electrical and mechanical compatibility for ongoing production and maintenance requirements.

Substiute Parts

OP271

TT Electronics/Optek TechnologyIn Stock: 3967OP271 Datasheet

Current PartRFQ

QEB363GR

onsemiIn Stock: 53746QEB363GR Datasheet

MFR RecommendedRFQ

QEB363ZR

onsemiIn Stock: 73580QEB363ZR Datasheet

MFR RecommendedRFQ

QEB373

onsemiIn Stock: 3135QEB373 Datasheet

MFR RecommendedRFQ

QEB373ZR

onsemiIn Stock: 10271QEB373ZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OP271 are identified based on the following critical parameters that determine functional equivalence:

Electrical Compatibility Criteria:

• Maximum forward current (If Max): 50mA (fixed requirement)
• Forward voltage (Vf): Tolerance range 1.5V to 1.7V acceptable
• Wavelength: 875nm to 940nm range acceptable for IR applications

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount required
• Package configuration: 2-SMD variants (Gull Wing or Z-Bend acceptable)

Regulatory & Environmental Criteria:

• RoHS3 compliance mandatory
• Operating temperature range: Minimum -40°C ~ 85°C required

Substitute parts are grouped into two categories based on package orientation: SMD Gull Wing variants (QEB363GR) and SMD Z-Bend variants (QEB363ZR, QEB373ZR). The QEB373 axial through-hole variant is listed but does not meet the surface mount requirement of the original OP271.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Direct Package Match): QEB363GR is the recommended substitute for applications requiring identical 2-SMD Gull Wing package configuration. This part maintains surface mount compatibility and meets all RoHS3 compliance requirements. The 940nm wavelength and 1.6V forward voltage represent minor deviations within acceptable IR emitter operating ranges for most applications.

Alternative Substitute (Z-Bend Package): QEB363ZR provides equivalent electrical specifications with alternative Z-Bend package orientation. Selection of this variant depends on PCB layout constraints and assembly equipment compatibility.

Secondary Substitute (Wavelength Variant): QEB373ZR offers 875nm wavelength with higher radiant intensity (16mW/sr @ 100mA) in SMD Z-Bend configuration. This part is suitable only for applications where 875nm wavelength is acceptable and higher optical output is beneficial.

Not Recommended for Direct Substitution: QEB373 (axial through-hole) does not meet the surface mount requirement of the OP271 and requires different PCB design and assembly processes.

All recommended substitutes provide extended operating temperature ranges (-40°C ~ 100°C) exceeding the original OP271 specification, and maintain active product status ensuring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can QEB363GR be used as a direct replacement for OP271 in existing designs? A: Yes. QEB363GR maintains identical mounting type (surface mount), package configuration (2-SMD Gull Wing), and maximum forward current (50mA). The 940nm wavelength and 1.6V forward voltage are within acceptable operating parameters for IR emitter applications. PCB layout and assembly processes require no modification.

Q: What is the difference between QEB363GR and QEB363ZR? A: Both parts are manufactured by onsemi with identical electrical specifications (940nm, 50mA, 1.6V). The primary difference is package orientation: QEB363GR uses Gull Wing configuration while QEB363ZR uses Z-Bend configuration. Selection depends on PCB footprint design and assembly equipment capabilities.

Q: Why is QEB373 listed if it is not recommended? A: QEB373 is included in the substitute list but does not meet the surface mount requirement of the OP271. This part uses through-hole axial configuration and requires different PCB design and assembly processes. It is suitable only for applications where through-hole mounting is acceptable.

Q: What are the implications of the wavelength difference between OP271 (890nm) and QEB363GR (940nm)? A: The 50nm wavelength difference places both parts within the near-infrared spectrum. Most IR receiver circuits and photodiode sensors operate across this wavelength range. Application-specific verification is necessary only if the original design includes wavelength-dependent optical filtering or specialized receiver components.

Q: Does the moisture sensitivity level difference affect substitution? A: OP271 has MSL 1 (unlimited moisture exposure tolerance) while QEB363GR and QEB363ZR have MSL 3 (168 hours). This indicates stricter moisture handling requirements for substitute parts during storage and assembly. Standard moisture control procedures (dry storage, controlled humidity assembly environment) are required.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts (QEB363GR, QEB363ZR, QEB373ZR) are ROHS3 compliant, matching the compliance status of the original OP271.