UCC28050D Equivalent & Substitute Parts

Part Overview

The UCC28050D is a Power Factor Correction (PFC) controller IC manufactured by Texas Instruments, designed for discontinuous (transition) mode operation at 200kHz switching frequency. This device is packaged in 8-SOIC surface mount configuration and is currently in Last Time Buy status, indicating end-of-life production. Finding equivalent substitute parts is necessary due to limited inventory availability and the product's discontinued status for new designs.

Substiute Parts

UCC28050D

Texas InstrumentsIn Stock: 2209UCC28050D 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 for the UCC28050D is determined by the following critical parameters:

Functional Mode: All substitute parts must operate in Discontinuous (Transition) mode PFC control, matching the primary application topology.

Package Compatibility: The 8-SOIC package is the primary form factor. The UCC28056CDBVR uses SOT-23-6 packaging, which represents a different pinout and board layout footprint, requiring PCB redesign. The L6561D and L6561D013TR maintain 8-SOIC compatibility with identical mechanical dimensions.

Supply Voltage Range: The UCC28050D operates within 15.4V ~ 18V. Substitute parts must accommodate this range or provide broader compatibility. The UCC28056CDBVR (8.5V ~ 34V) and L6561D/L6561D013TR (11V ~ 18V) all support the required voltage window.

Startup Current: The UCC28050D draws 75 µA at startup. Substitute parts with lower startup current (L6561D at 50 µA, UCC28056CDBVR at 46 µA) are functionally compatible and may offer improved efficiency.

Operating Temperature Range: The UCC28050D operates from -40°C to 105°C. Substitutes with extended ranges (-40°C to 125°C for L6561D and UCC28056CDBVR) provide broader environmental compatibility.

Compliance & Status: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes): L6561D or L6561D013TR are the preferred substitutes. Both maintain the 8-SOIC package footprint, eliminating PCB redesign requirements. L6561D013TR offers higher inventory availability (100,400 pcs) compared to L6561D (19,543 pcs). Both parts support the UCC28050D supply voltage range and operate in the required discontinuous transition mode. Note that both L6561D variants carry "Not For New Designs" status, indicating they are suitable for legacy system support and replacement applications.

For New Design Flexibility: UCC28056CDBVR is the only active product among the substitutes, making it the recommended choice for new designs. This part offers the broadest supply voltage range (8.5V ~ 34V), extended operating temperature range (-40°C to 125°C), and lower startup current (46 µA). However, the SOT-23-6 package requires PCB layout modification and schematic redesign due to different pinout configuration.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the UCC28050D. Selection should prioritize inventory availability and product lifecycle status based on application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use UCC28056CDBVR as a direct replacement without PCB changes? A: No. The UCC28056CDBVR uses SOT-23-6 packaging, while the UCC28050D uses 8-SOIC. These packages have different pinouts and mechanical dimensions, requiring PCB layout redesign and schematic modifications.

Q: Are L6561D and L6561D013TR electrically identical? A: Yes. Both parts are the same base product (L6561) with identical electrical specifications. The difference is packaging format: L6561D is supplied in Tube, while L6561D013TR is supplied in Cut Tape & Digi-Reel. L6561D013TR has significantly higher inventory availability.

Q: Why is UCC28056CDBVR marked as Active while L6561D variants are Not For New Designs? A: Product status reflects manufacturer lifecycle decisions. UCC28056CDBVR remains in active production and is recommended for new designs. L6561D variants are legacy products suitable for replacement and support applications only.

Q: What is the minimum supply voltage requirement for substitution? A: The UCC28050D requires 15.4V ~ 18V. All substitute parts support this range: UCC28056CDBVR (8.5V ~ 34V), L6561D (11V ~ 18V), and L6561D013TR (11V ~ 18V). Verify your circuit design operates within the specified voltage window.

Q: Does lower startup current affect circuit performance? A: Substitute parts with lower startup current (L6561D at 50 µA, UCC28056CDBVR at 46 µA versus UCC28050D at 75 µA) may improve overall system efficiency and reduce power dissipation during startup phases. Circuit validation is necessary to confirm performance in your specific application.

Q: Are all parts RoHS3 compliant? A: Yes. The UCC28050D and all substitute parts (UCC28056CDBVR, L6561D, L6561D013TR) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.