SC442ULTRT Equivalent & Substitute Parts

Part Overview

The SC442ULTRT is an LED Driver IC manufactured by Semtech Corporation, designed for power management applications requiring step-up (boost) DC-DC regulation with PWM dimming capability. This device features 10 output channels with 30mA per-channel current capability and operates across a 4.5V to 21V supply range, delivering up to 42V output for backlight applications in automotive-grade environments.

The SC442ULTRT 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

SC442ULTRT

Semtech CorporationIn Stock: 1451SC442ULTRT Datasheet

Current PartRFQ

MC34844AEPR2

NXP USA Inc.In Stock: 2257MC34844AEPR2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SC442ULTRT is determined by the following core parameters:

• Topology: Step-Up (Boost) DC-DC regulation architecture
• Number of Outputs: 10 output channels
• Dimming Capability: PWM dimming support
• Applications: Backlight driver functionality
• Mounting Type: Surface Mount configuration
• Internal Switch(s): Integrated switching element

The MC34844AEPR2 qualifies as a manufacturer-recommended substitute based on functional equivalence across these critical parameters. Both devices implement identical topology, output channel count, and dimming methodology. Differences in electrical specifications (supply voltage range, output voltage range, per-channel current rating) and packaging format reflect design evolution and enhanced performance characteristics while maintaining core functional compatibility for backlight driver applications.

Parameter Comparison

Engineering Selection Recommendations

The MC34844AEPR2 is the manufacturer-recommended substitute for the obsolete SC442ULTRT. Selection of this alternative is supported by the following engineering considerations:

Product Status: The SC442ULTRT is obsolete, making the active-status MC34844AEPR2 the appropriate choice for ongoing supply and new production requirements.

Compliance & Certifications: The MC34844AEPR2 carries RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The SC442ULTRT MSL rating of 1 (Unlimited) provides superior moisture handling compared to the MC34844AEPR2 MSL rating of 3 (168 Hours); however, this difference is manageable through standard moisture control procedures during component storage and assembly.

Functional Equivalence: Both devices share identical core architecture (10-output step-up boost topology with PWM dimming for backlight applications), ensuring functional compatibility at the system level.

Enhanced Specifications: The MC34844AEPR2 provides higher per-channel current capability (80mA vs. 30mA) and extended output voltage range (8V–60V vs. 42V fixed), offering design flexibility for future applications while maintaining backward compatibility with existing SC442ULTRT designs operating within the overlapping parameter space.

Package Consideration: The MC34844AEPR2 uses a 32-pin package versus the SC442ULTRT 28-pin package, requiring PCB layout modification. This is a standard engineering consideration for component substitution and does not affect functional performance.

Frequently Asked Questions (FAQ)

Q: Can the MC34844AEPR2 directly replace the SC442ULTRT without design changes?

A: Functional replacement is possible because both devices implement identical 10-output step-up boost topology with PWM dimming for backlight applications. However, the MC34844AEPR2 uses a 32-pin package versus the SC442ULTRT 28-pin package, requiring PCB layout redesign. Pin-to-pin compatibility does not exist; circuit schematic review and board layout modification are necessary.

Q: What are the key differences in electrical specifications?

A: The MC34844AEPR2 operates across a wider supply voltage range (7V–28V vs. 4.5V–21V) and provides higher per-channel current (80mA vs. 30mA). The MC34844AEPR2 output voltage is configurable (8V–60V) versus the SC442ULTRT fixed 42V output. These differences allow the MC34844AEPR2 to support a broader range of applications while remaining functionally compatible with SC442ULTRT designs operating within overlapping specifications.

Q: Are there moisture sensitivity differences between these parts?

A: Yes. The SC442ULTRT has MSL 1 (Unlimited), while the MC34844AEPR2 has MSL 3 (168 Hours). The MC34844AEPR2 requires more stringent moisture control during storage and assembly. Standard industry practices for MSL 3 components (desiccant packaging, controlled humidity during reflow) are sufficient to manage this difference.

Q: Does the MC34844AEPR2 support the same dimming methods?

A: The SC442ULTRT supports PWM dimming only. The MC34844AEPR2 supports both analog and PWM dimming, providing additional design flexibility. Existing PWM dimming implementations will function identically on the MC34844AEPR2.

Q: What compliance certifications apply to the MC34844AEPR2?

A: The MC34844AEPR2 is RoHS3 compliant and REACH unaffected. Both devices share the same ECCN (EAR99) and HTSUS classification (8542.39.0001), simplifying regulatory and export documentation.