UCC29950DR Equivalent & Substitute Parts

Part Overview

The UCC29950DR is a Power Factor Correction (PFC) controller IC manufactured by Texas Instruments, designed for continuous conduction mode (CCM) operation at 87kHz to 109kHz switching frequency. This device is classified as Last Time Buy, indicating end-of-life status. The UCC29950DR operates with a supply voltage range of 11V to 18V and is housed in a 16-SOIC surface mount package. Due to its Last Time Buy status, identifying functionally equivalent substitute components is necessary for design continuity and long-term product support.

Substiute Parts

UCC29950DR

Texas InstrumentsIn Stock: 3684UCC29950DR Datasheet

Current PartRFQ

UCC28512DWR

Texas InstrumentsIn Stock: 757UCC28512DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The UCC28512DWR is identified as a manufacturer-recommended substitute for the UCC29950DR. Substitution eligibility is determined by the following criteria:

Functional Compatibility: Both devices are PFC controller ICs from Texas Instruments designed for power factor correction applications in the Power Management (PMIC) category.

Supply Voltage Overlap: The UCC29950DR operates at 11V ~ 18V, while the UCC28512DWR operates at 9.7V ~ 18V. The overlapping range (11V ~ 18V) permits substitution within this common operating window.

Surface Mount Technology: Both components use surface mount packaging, maintaining assembly process compatibility.

Compliance Alignment: Both parts are ROHS3 compliant, REACH unaffected, and carry MSL rating 1, ensuring regulatory and environmental compatibility.

Key Differences: The UCC28512DWR operates in Average Current mode at 200kHz (versus CCM at 87kHz ~ 109kHz for the UCC29950DR) and uses a 20-SOIC package (versus 16-SOIC). These differences require circuit design evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

The UCC28512DWR is designated as the manufacturer-recommended substitute for the UCC29950DR. Selection of this substitute is supported by:

Product Status Alignment: The UCC28512DWR carries Active product status, ensuring continued availability and manufacturer support, whereas the UCC29950DR is Last Time Buy.

Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements.

Certification Parity: Both devices carry identical MSL ratings (1 - Unlimited), ensuring equivalent moisture handling and storage requirements.

Operational Envelope: The overlapping supply voltage range (11V ~ 18V) and common operating temperature minimum (-40°C) provide baseline compatibility for standard applications.

Design Considerations: Circuit redesign is required to accommodate the shift from CCM at 87kHz ~ 109kHz to Average Current mode at 200kHz, as well as the package transition from 16-SOIC to 20-SOIC. These changes affect PCB layout, component selection, and control loop design.

Frequently Asked Questions (FAQ)

Q: Can the UCC28512DWR be used as a direct pin-for-pin replacement for the UCC29950DR?

A: No. The UCC28512DWR uses a 20-SOIC package with additional pins compared to the 16-SOIC package of the UCC29950DR. PCB redesign and schematic modification are required.

Q: What is the primary functional difference between these two PFC controllers?

A: The UCC29950DR operates in Continuous Conduction (CCM) mode at 87kHz ~ 109kHz, while the UCC28512DWR operates in Average Current mode at 200kHz. These different control topologies require distinct circuit implementations.

Q: Are both devices suitable for the same supply voltage applications?

A: Both devices operate within the 11V ~ 18V range, permitting substitution within this overlapping window. The UCC28512DWR extends lower to 9.7V, providing additional flexibility for lower voltage applications.

Q: What is the temperature operating range difference?

A: The UCC29950DR operates to 125°C maximum, while the UCC28512DWR operates to 105°C maximum. Applications requiring operation above 105°C cannot use the UCC28512DWR as a substitute.

Q: Are there any compliance or certification differences between these parts?

A: Both components are ROHS3 compliant, REACH unaffected, and carry MSL rating 1. No compliance barriers exist for substitution.

Q: Why is the UCC29950DR classified as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this product line. The UCC28512DWR, with Active status, represents the recommended path forward for new designs and ongoing production.