VSMY98545 Equivalent & Substitute Parts

Part Overview

The VSMY98545 is an infrared (IR) emitter operating at 850nm wavelength, designed for surface mount applications requiring 1A forward current capability. Manufactured by Vishay Semiconductor Opto Division under the SurfLight™ series, this component delivers 230mW/sr radiant intensity at rated current with a 90° viewing angle. The part is classified as Not For New Designs, indicating it has reached end-of-life status. Identifying equivalent substitute parts is necessary for ongoing production support, maintenance applications, and designs requiring compatible IR emitter functionality.

Substiute Parts

VSMY98545

Vishay Semiconductor Opto DivisionIn Stock: 22962VSMY98545 Datasheet

Current PartRFQ

LTE-R38386-S

Lite-On Inc.In Stock: 803LTE-R38386-S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VSMY98545 are identified based on the following critical parameters that determine functional compatibility:

• Wavelength: Must be 850nm to maintain spectral compatibility with receiver circuits and optical filters
• Forward Current Rating (If Max): Must be rated for 1A operation
• Forward Voltage (Vf): Must be 1.8V typical to ensure circuit compatibility
• Viewing Angle: Must be 90° to match optical field requirements
• Mounting Type: Must be surface mount to fit existing PCB layouts
• Operating Temperature Range: Must support the required thermal envelope
• RoHS Compliance: Must meet ROHS3 requirements for regulatory compliance

The LTE-R38386-S from Lite-On Inc. meets these substitution criteria. While it features a different package configuration (2-SMD with exposed pad versus 3-SMD no lead) and lower radiant intensity specification (160mW/sr versus 230mW/sr), it maintains electrical and optical compatibility across all critical parameters.

Parameter Comparison

Engineering Selection Recommendations

The LTE-R38386-S qualifies as a functional substitute for the VSMY98545 based on matching electrical specifications (1A forward current, 1.8V forward voltage, 850nm wavelength) and optical characteristics (90° viewing angle). Both components maintain ROHS3 compliance and identical moisture sensitivity ratings.

Selection of the LTE-R38386-S is supported by its Active product status, providing ongoing manufacturer support and supply availability compared to the VSMY98545's Not For New Designs classification. The substitute part's narrower operating temperature range (-40°C to 85°C versus -40°C to 95°C) requires verification against application thermal requirements. The lower radiant intensity specification (160mW/sr versus 230mW/sr) necessitates circuit-level validation to confirm adequate signal strength for receiver detection thresholds.

The different package footprint (2-SMD with exposed pad versus 3-SMD no lead) requires PCB layout modification and revalidation of thermal management characteristics.

Frequently Asked Questions (FAQ)

Q: Can the LTE-R38386-S directly replace the VSMY98545 without circuit modification?

A: Electrical compatibility exists for forward current, voltage, and wavelength specifications. However, the different package footprint requires PCB layout changes. The lower radiant intensity may require circuit-level validation depending on receiver sensitivity margins.

Q: What is the significance of the radiant intensity difference (230mW/sr versus 160mW/sr)?

A: Radiant intensity determines optical power output at the specified viewing angle. The 30% reduction in the substitute part may impact detection range or signal-to-noise ratio in the receiver circuit. Applications with tight optical budgets require performance testing.

Q: Does the narrower operating temperature range of the LTE-R38386-S affect compatibility?

A: The substitute part operates from -40°C to 85°C versus the original -40°C to 95°C. Applications requiring operation above 85°C cannot use this substitute without thermal management modifications or alternative part selection.

Q: Are both parts RoHS compliant?

A: Yes, both VSMY98545 and LTE-R38386-S are ROHS3 compliant and carry identical MSL ratings of 3 (168 Hours), ensuring equivalent handling and storage requirements.

Q: What are the package implications of switching from 3-SMD to 2-SMD with exposed pad?

A: The package change requires PCB footprint redesign. The exposed pad on the LTE-R38386-S may provide improved thermal dissipation characteristics but necessitates layout revalidation and potential assembly process adjustments.