LTST-5630VEWT Equivalent & Substitute Parts

Part Overview

The LTST-5630VEWT is a red diffused SMD LED manufactured by Lite-On Inc., designed for indication applications with a dominant wavelength of 624nm and peak wavelength of 631nm. This component features a 4-SMD flat lead package with a rectangular lens profile and 120° viewing angle. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component sourcing.

Substiute Parts

LTST-5630VEWT

Lite-On Inc.In Stock: 12140LTST-5630VEWT Datasheet

Current PartRFQ

LTW-5630SD630

Lite-On Inc.In Stock: 747LTW-5630SD630 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-5630VEWT is determined by the following critical parameters:

Mechanical Compatibility:

• Package type: 4-SMD, flat lead configuration
• Physical dimensions: 5.30mm L x 3.00mm W footprint
• Height constraint: maximum 0.90mm seated height
• Lens profile: rectangular with flat top geometry

Electrical Compatibility:

• Forward voltage (Vf): 2.3V nominal operating point
• Test current: 120mA baseline
• Viewing angle: 120° optical performance
• Wavelength range: red spectrum (620-635nm acceptable range)

Environmental & Compliance:

• Moisture sensitivity: MSL 3 or better
• Regulatory compliance: REACH and ECCN alignment

The substitute part LTW-5630SD630 meets these criteria through equivalent mechanical packaging, compatible electrical characteristics within acceptable tolerances, and maintained environmental compliance ratings.

Parameter Comparison

Engineering Selection Recommendations

The LTW-5630SD630 serves as a direct functional substitute for the obsolete LTST-5630VEWT based on the following engineering criteria:

Product Status Alignment: The substitute part maintains active production status, ensuring long-term component availability and supply chain continuity compared to the obsolete main part.

Compliance & Certification: Both parts share identical ECCN (EAR99) and HTSUS classifications, maintaining regulatory consistency. The substitute part achieves ROHS3 compliance, providing enhanced environmental standards alignment.

Mechanical Compatibility: Identical footprint dimensions (5.30mm x 3.00mm) and equivalent MSL rating (3) ensure direct PCB layout compatibility. The height difference of 0.07mm (0.97mm vs 0.90mm) remains within typical assembly tolerances for surface mount processes.

Electrical Performance: Forward voltage increases by 0.1V (2.4V vs 2.3V) and test current increases by 30mA (150mA vs 120mA). These variations fall within standard LED operating parameter ranges and require circuit-level verification for current-limiting resistor adjustment.

Optical Characteristics: Wavelength shift from 624nm to 630nm remains within the red spectrum range. Both parts maintain 120° viewing angle, preserving optical performance for indication applications.

Frequently Asked Questions (FAQ)

Q: Can the LTW-5630SD630 be used as a direct drop-in replacement for the LTST-5630VEWT?

A: Mechanical compatibility is confirmed through identical footprint and MSL rating. However, the 0.1V forward voltage increase and 30mA current increase require circuit verification. Existing current-limiting resistor values must be recalculated to maintain proper LED brightness and operating point.

Q: What is the significance of the wavelength difference between 624nm and 630nm?

A: Both wavelengths fall within the red spectrum range suitable for indication applications. The 6nm shift represents a minor color perception difference. Visual compatibility depends on application-specific color matching requirements; this parameter should be evaluated against end-use specifications.

Q: Does the exposed pad on the LTW-5630SD630 affect PCB layout?

A: The exposed pad variant provides improved thermal performance compared to the flat lead configuration. PCB layout modifications are not required for mechanical compatibility, but thermal pad connection is recommended for enhanced heat dissipation in high-current applications.

Q: Are there any height clearance concerns with the 0.07mm increase?

A: The height increase from 0.90mm to 0.97mm remains within standard surface mount assembly tolerances. Clearance verification is necessary only in applications with strict height constraints or confined component spacing.

Q: How does the MSL rating affect component handling?

A: Both parts carry MSL 3 rating, requiring identical moisture control procedures during storage and assembly. No change to component handling protocols is necessary when substituting between these parts.

Q: What certifications does the substitute part provide?

A: The LTW-5630SD630 maintains REACH Unaffected status and EAR99 ECCN classification. Additionally, it achieves ROHS3 compliance, providing enhanced environmental regulatory alignment compared to the main part specifications.