SC620ULTRT LED Driver IC - Equivalent & Substitute Parts

Part Overview

The SC620ULTRT is a linear LED driver IC manufactured by Semtech Corporation, designed for 8-channel LED backlight applications. This device features 25mA per-channel output capability with internal switching and operates across a 2.7V to 5.5V supply voltage range. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. For new product development or replacement inventory, equivalent substitute parts meeting the same functional and electrical specifications are necessary.

Substiute Parts

SC620ULTRT

Semtech CorporationIn Stock: 6416SC620ULTRT Datasheet

Current PartRFQ

NLSF595DTR2G

onsemiIn Stock: 9248NLSF595DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SC620ULTRT are identified based on the following critical parameters that determine functional equivalence:

• 8-channel output configuration
• Linear LED driver topology with internal switching
• Supply voltage range compatibility (minimum 2.7V, maximum 5.5V)
• Per-channel current output capability (25mA nominal)
• Surface mount packaging suitable for automated assembly
• ROHS3 compliance and MSL Level 1 rating
• Active product status for ongoing availability

The NLSF595DTR2G from onsemi meets these core substitution criteria, though with specific parameter variations noted in the comparison table below.

Parameter Comparison

Engineering Selection Recommendations

The NLSF595DTR2G serves as a functional substitute for the SC620ULTRT in applications where the following conditions are met:

• Circuit design accommodates the reduced per-channel current rating of 12mA versus the original 25mA specification
• PCB layout can be adapted to the 16-TSSOP package footprint, which differs from the original 16-UFQFN Exposed Pad package
• Application requirements fall within the -55°C to 125°C operating temperature range of the substitute part
• Supply voltage requirements remain within the 2V to 5.5V range

The NLSF595DTR2G offers the advantage of active product status and extended temperature range, supporting long-term design continuity. Both parts maintain ROHS3 compliance and MSL Level 1 ratings, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the NLSF595DTR2G directly replace the SC620ULTRT without circuit modifications?

A: Direct replacement requires evaluation of current requirements. The NLSF595DTR2G is rated for 12mA per channel versus the SC620ULTRT's 25mA. If the application requires the full 25mA per-channel output, circuit redesign is necessary. Package differences (16-TSSOP versus 16-UFQFN) also require PCB layout changes.

Q: What are the package compatibility considerations?

A: The SC620ULTRT uses a 16-UFQFN Exposed Pad package, while the NLSF595DTR2G uses a 16-TSSOP package. These have different footprints, pin spacing, and thermal characteristics. PCB redesign is required for substitution.

Q: Are both parts compliant with environmental and regulatory standards?

A: Both the SC620ULTRT and NLSF595DTR2G are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 ratings. Both are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: Why is the SC620ULTRT marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. The NLSF595DTR2G, with active product status, is the recommended path for ongoing designs requiring 8-channel linear LED driver functionality.

Q: What is the frequency specification difference?

A: The SC620ULTRT specifies 400kHz operating frequency. The NLSF595DTR2G does not specify frequency in the provided parameters. Frequency characteristics should be confirmed from detailed datasheets if timing-critical applications are involved.