SME2470-021 Infrared Emitter Equivalent & Substitute Parts

Part Overview

The SME2470-021 is an infrared (IR) emitter manufactured by Honeywell Sensing and Productivity Solutions, designed for applications requiring 880nm wavelength emission at 75mA maximum forward current. This component operates at a typical forward voltage of 1.5V and delivers 0.6mW/cm² radiant intensity at 50mA. The device is packaged in a 2-SMD, No Lead surface mount configuration suitable for automated assembly processes.

The SME2470-021 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems currently utilizing this component.

Substiute Parts

SME2470-021

Honeywell Sensing and Productivity SolutionsIn Stock: 26641SME2470-021 Datasheet

Current PartRFQ

B2151IR-20C000133U1930

Harvatek CorporationIn Stock: 18521B2151IR-20C000133U1930 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SME2470-021 is evaluated based on the following critical parameters:

Primary Substitution Criteria:

• Wavelength compatibility: The SME2470-021 operates at 880nm. Substitute parts must operate within the same infrared spectrum band to maintain functional compatibility with optical receivers and system design specifications.
• Forward current rating: Maximum DC forward current of 75mA establishes the upper operating limit. Substitute parts must support equivalent or higher current ratings to ensure safe operation within existing circuit designs.
• Forward voltage: Typical forward voltage of 1.5V must be matched or closely aligned to prevent circuit redesign requirements.
• Radiant intensity: The specified 0.6mW/cm² @ 50mA establishes the optical output requirement. Substitute parts must deliver equivalent or superior radiant intensity to maintain system performance.
• Operating temperature range: The -55°C ~ 125°C range defines environmental operating limits. Substitute parts must support this full range or a compatible subset.
• Package and mounting: 2-SMD, No Lead surface mount configuration ensures mechanical and electrical compatibility with existing PCB layouts.
• Compliance certifications: RoHS compliance and ECCN/HTSUS classifications must be maintained.

The B2151IR-20C000133U1930 from Harvatek Corporation is identified as a substitute part. However, this part operates at 940nm wavelength, which differs from the 880nm specification of the SME2470-021. This wavelength difference represents a functional deviation that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SME2470-021 is classified as obsolete, while the B2151IR-20C000133U1930 is in active production status. This distinction is significant for long-term supply chain planning and component availability.

Compliance and Certification: Both parts maintain RoHS compliance and share identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications, ensuring regulatory alignment for procurement and export purposes.

Functional Differences: The B2151IR-20C000133U1930 operates at 940nm wavelength, which represents a 60nm shift from the SME2470-021's 880nm specification. This wavelength difference directly affects optical receiver compatibility and system performance characteristics. The choice between these parts depends on whether the receiving optics and photodetectors in the target application are designed for 880nm or 940nm operation.

Electrical and Thermal Characteristics: The B2151IR-20C000133U1930 has a lower maximum forward current rating (65mA versus 75mA) and a narrower operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C). Applications requiring the full temperature range or higher current capacity may not be suitable for this substitute.

Packaging and Handling: The B2151IR-20C000133U1930 features a right-angle mounting orientation, which differs from the standard top-view orientation of the SME2470-021. This may require PCB layout modifications. Additionally, the B2151IR-20C000133U1930 has MSL 2A (4 weeks) sensitivity compared to MSL 1 (unlimited) for the SME2470-021, requiring more stringent moisture control during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can the B2151IR-20C000133U1930 be used as a direct replacement for the SME2470-021?

A: Direct replacement is not recommended without application-specific verification. The 60nm wavelength difference (880nm to 940nm) requires confirmation that the receiving photodetector and optical system are compatible with 940nm emission. Additionally, the lower maximum forward current (65mA) and narrower operating temperature range must be evaluated against circuit requirements.

Q: What is the significance of the wavelength difference between 880nm and 940nm?

A: Wavelength determines the spectral characteristics of the infrared emission. Different photodetectors and optical filters are optimized for specific wavelength bands. A 60nm shift may result in reduced optical coupling efficiency, altered receiver sensitivity, or complete incompatibility depending on the receiver design. System-level testing is required to confirm functional equivalence.

Q: Are there any handling differences between these two parts?

A: Yes. The SME2470-021 has MSL 1 (unlimited moisture sensitivity level), while the B2151IR-20C000133U1930 has MSL 2A (4 weeks). The B2151IR-20C000133U1930 requires more careful moisture control during storage, with a maximum shelf life of 4 weeks at specified humidity levels before baking is required. Standard MSL 1 components have no such restrictions.

Q: Does the right-angle mounting of the B2151IR-20C000133U1930 affect PCB compatibility?

A: Yes. The SME2470-021 uses standard top-view surface mount orientation, while the B2151IR-20C000133U1930 uses right-angle mounting. This difference requires PCB footprint modification and may affect component placement and solder reflow profiles. Mechanical clearance and thermal management considerations may also change.

Q: What is the impact of the lower maximum forward current rating?

A: The B2151IR-20C000133U1930 is rated for 65mA maximum forward current compared to 75mA for the SME2470-021. If the existing circuit design operates the emitter at currents above 65mA, the substitute part would exceed its maximum rating and risk premature failure or reduced reliability. Circuit redesign or current limiting modifications would be necessary.

Q: How do the operating temperature ranges compare?

A: The SME2470-021 operates from -55°C to 125°C, while the B2151IR-20C000133U1930 operates from -40°C to 85°C. Applications requiring operation below -40°C or above 85°C cannot use the B2151IR-20C000133U1930. The SME2470-021 supports a significantly wider temperature envelope, particularly for high-temperature industrial applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the SME2470-021 and B2151IR-20C000133U1930 are RoHS compliant and share identical ECCN and HTSUS classifications, ensuring regulatory compliance for procurement and international trade purposes.