UCC28050DR Equivalent & Substitute Parts

Part Overview

The UCC28050DR is a Power Factor Correction (PFC) controller IC manufactured by Texas Instruments, designed for discontinuous (transition) mode operation at 200kHz switching frequency. This 8-SOIC surface mount device operates with a supply voltage range of 15.4V to 18V and a startup current of 75µA, suitable for power management applications requiring PFC functionality.

The UCC28050DR is currently in Last Time Buy status, indicating that Texas Instruments has discontinued this part and existing inventory is limited. This necessitates identification of equivalent substitute parts that maintain functional compatibility while offering continued availability or improved specifications for new designs.

Substiute Parts

UCC28050DR

Texas InstrumentsIn Stock: 2268UCC28050DR Datasheet

Current PartRFQ

UCC28056CDBVR

Texas InstrumentsIn Stock: 21228UCC28056CDBVR Datasheet

MFR RecommendedRFQ

L6561D

STMicroelectronicsIn Stock: 19582L6561D Datasheet

MFR RecommendedRFQ

L6561D013TR

STMicroelectronicsIn Stock: 100450L6561D013TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UCC28050DR is determined by the following critical parameters:

Primary Compatibility Criteria:

• Functional Mode: Discontinuous (Transition) PFC operation
• Package Type: 8-SOIC form factor (mechanical compatibility with PCB layout)
• Surface Mount capability
• RoHS3 compliance and MSL Level 1 rating

Secondary Compatibility Considerations:

• Supply voltage range overlap with the original 15.4V ~ 18V specification
• Operating temperature range coverage
• Startup current characteristics
• Switching frequency alignment (where specified)

The substitute parts identified maintain the core PFC controller functionality in discontinuous/transition mode and are housed in compatible 8-SOIC packages. However, variations exist in supply voltage ranges, operating temperature limits, and switching frequency specifications, which must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

UCC28056CDBVR (Texas Instruments - Active Status)

This part is the manufacturer-recommended substitute from Texas Instruments and maintains active product status. It operates in the same discontinuous (transition) PFC mode with lower startup current (46µA vs. 75µA). The supply voltage range of 8.5V ~ 34V encompasses the original 15.4V ~ 18V specification with extended headroom. Operating temperature range extends to 125°C. However, the package differs (SOT-23-6 vs. 8-SOIC), requiring PCB layout redesign. This option is preferred for new designs requiring continued manufacturer support.

L6561D013TR (STMicroelectronics - Cut Tape & Digi-Reel Packaging)

This STMicroelectronics part maintains the 8-SOIC package form factor, eliminating layout redesign requirements. It operates in discontinuous (transition) mode with 50µA startup current. The supply voltage range of 11V ~ 18V covers the original specification. Operating temperature extends to 125°C. Product status is "Not For New Designs," indicating this is a legacy part suitable for replacement applications or inventory management. Highest inventory availability (100,400 pcs) supports immediate procurement needs.

L6561D (STMicroelectronics - Tube Packaging)

This part shares identical electrical specifications with L6561D013TR but is supplied in tube packaging rather than cut tape format. It maintains 8-SOIC package compatibility and discontinuous (transition) mode operation. Product status is "Not For New Designs." Selection depends on packaging format requirements and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can UCC28056CDBVR directly replace UCC28050DR on existing PCBs?

A: No. UCC28056CDBVR uses SOT-23-6 packaging versus the original 8-SOIC package. PCB layout modification is required, including trace routing and component placement adjustments. Pin configuration differs between packages.

Q: Are L6561D and L6561D013TR electrically identical?

A: Yes. Both parts are STMicroelectronics L6561 base products with identical electrical specifications. The difference is packaging format: L6561D is supplied in tubes, while L6561D013TR is supplied in cut tape with Digi-Reel option. Selection depends on assembly process requirements.

Q: Which substitute maintains the closest electrical match to UCC28050DR?

A: L6561D013TR provides the closest match: identical 8-SOIC package, overlapping supply voltage range (11V ~ 18V covers 15.4V ~ 18V), and equivalent discontinuous (transition) mode operation. Startup current is lower (50µA vs. 75µA), which is operationally acceptable.

Q: Why does UCC28056CDBVR have a wider supply voltage range?

A: UCC28056CDBVR is designed for broader application flexibility with 8.5V ~ 34V operation. This extended range does not affect compatibility with the original 15.4V ~ 18V specification; the part operates correctly within this narrower window.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active development and support for these parts. They remain available from existing inventory but are not recommended for new product development. For new designs, UCC28056CDBVR (Active status) is the preferred choice.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original UCC28050DR specifications.