SC441CTETRT LED Driver IC Equivalent & Substitute Parts

Part Overview

The SC441CTETRT is a 4-output LED driver IC with integrated DC-DC step-up (boost) regulator manufactured by Semtech Corporation. This device is designed for backlight applications, featuring PWM and analog dimming capabilities with a 150mA output current per channel. The part is currently obsolete, making equivalent substitute parts necessary for ongoing design support, production continuity, and system maintenance.

Substiute Parts

SC441CTETRT

Semtech CorporationIn Stock: 914SC441CTETRT Datasheet

Current PartRFQ

A8519KETTR-R

Allegro MicroSystemsIn Stock: 8226A8519KETTR-R Datasheet

MFR RecommendedRFQ

LP8551TLE/NOPB

Texas InstrumentsIn Stock: 1686LP8551TLE/NOPB Datasheet

MFR RecommendedRFQ

LT3599EFE#TRPBF

Analog Devices Inc.In Stock: 3988LT3599EFE#TRPBF Datasheet

MFR RecommendedRFQ

MP3384EQ-LF-P

Monolithic Power Systems Inc.In Stock: 1019MP3384EQ-LF-P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SC441CTETRT is determined by the following critical parameters:

• Topology: Step-up (boost) DC-DC regulator with 4 outputs
• Supply Voltage Range: Minimum 4.5V input capability
• Output Voltage: Capable of 40V or higher
• Current Capacity: Minimum 40mA per channel (SC441 provides 150mA)
• Dimming Control: PWM and/or analog dimming support
• Package Type: Surface mount with exposed pad
• Internal Switch: Integrated switching element required

All substitute parts listed maintain these core functional requirements. Variations in frequency, package footprint, and maximum current capacity are secondary considerations dependent on application-specific constraints.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): LT3599EFE#TRPBF (Analog Devices Inc.) is the preferred substitute. This part maintains active product status, offers the closest electrical compatibility with 120mA per-channel current capacity, supports both analog and PWM dimming, and operates across an extended temperature range (-40°C to 125°C). The 28-TSSOP-EP package is mechanically similar to the original SC441CTETRT, minimizing PCB redesign requirements.

Secondary Substitute (High Current Applications): A8519KETTR-R (Allegro MicroSystems) provides 100mA per-channel output with extended supply voltage range (4.5V to 40V) and active product status with AEC-Q100 automotive qualification. This part is suitable for applications requiring higher input voltage tolerance. Package change from 20-TSSOP to 28-QFN requires PCB layout modification.

Alternative for Current-Limited Applications: LP8551TLE/NOPB (Texas Instruments) is suitable for lower-current backlight designs (50mA per channel) with the lowest minimum supply voltage (2.7V). This part maintains active status and ROHS3 compliance. The 25-DSBGA package represents a significant footprint change and requires careful PCB design consideration.

Legacy/Constrained Applications: MP3384EQ-LF-P (Monolithic Power Systems Inc.) is marked "Not For New Designs" and provides the lowest per-channel current (40mA). This part is suitable only for existing production support where design changes are restricted. The 16-QFN (3x3) package is the smallest footprint option.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SC441CTETRT with any of these substitutes without PCB modification? A: LT3599EFE#TRPBF uses the same 20-pin TSSOP package family and may allow direct substitution with minimal layout changes. Other substitutes require package-specific PCB redesign due to different pin counts and footprints (28-QFN, 25-DSBGA, 16-QFN).

Q: What is the minimum current capacity required for a valid substitute? A: The SC441CTETRT provides 150mA per channel. All listed substitutes meet minimum functional requirements with 40mA or higher per-channel capacity. Application-specific current requirements determine the appropriate substitute selection.

Q: Are all substitutes RoHS3 compliant? A: Yes, all active and legacy substitute parts listed are ROHS3 compliant. The original SC441CTETRT compliance status is not specified in available documentation.

Q: Which substitute supports both analog and PWM dimming like the original? A: LT3599EFE#TRPBF and A8519KETTR-R both support analog and PWM dimming. LP8551TLE/NOPB and MP3384EQ-LF-P support PWM dimming only.

Q: What is the impact of package change on design? A: Package changes require PCB layout redesign, including trace routing, via placement, and thermal management considerations. LT3599EFE#TRPBF minimizes this impact due to similar TSSOP package family. Larger packages (28-QFN, 25-DSBGA) may improve thermal performance but require significant layout modification.

Q: Can I use MP3384EQ-LF-P for new production designs? A: No. MP3384EQ-LF-P is marked "Not For New Designs" and should be used only for existing production support or legacy system maintenance.

Q: What is the supply voltage compatibility range across all substitutes? A: The SC441CTETRT operates from 4.5V to 27V. LT3599EFE#TRPBF extends this to 2.7V minimum and 30V maximum, providing the broadest input voltage range among active substitutes.