UCC29950D Equivalent & Substitute Parts

Part Overview

The UCC29950D 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 UCC29950D operates with a supply voltage range of 11V to 18V and is packaged in a 16-SOIC surface mount configuration.

Due to its Last Time Buy status, identifying functionally equivalent substitute components is essential for design continuity and long-term product support. The primary substitute identified is the UCC28512DWR, which offers comparable PFC control functionality with updated specifications and Active product status.

Substiute Parts

UCC29950D

Texas InstrumentsIn Stock: 1218UCC29950D Datasheet

Current PartRFQ

UCC28512DWR

Texas InstrumentsIn Stock: 757UCC28512DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCC29950D with the UCC28512DWR is based on the following alignment criteria:

Common Functional Parameters:

• Both devices are Texas Instruments PFC controller ICs
• Both operate in the Power Management (PMIC) category
• Both are designed for surface mount applications
• Both comply with ROHS3 and maintain MSL 1 (Unlimited) rating
• Both support supply voltage ranges that overlap within the 11V ~ 18V window

Substitution Considerations: The UCC28512DWR operates at 200kHz switching frequency (versus 87kHz ~ 109kHz for the UCC29950D) and uses Average Current mode control (versus Continuous Conduction mode). The UCC28512DWR is packaged in 20-SOIC format, requiring PCB layout modifications. The operating temperature range of the UCC28512DWR extends to -40°C ~ 105°C, which is narrower at the upper limit compared to the UCC29950D's -40°C ~ 125°C range.

Parameter Comparison

Engineering Selection Recommendations

The UCC28512DWR is the manufacturer-recommended substitute for the UCC29950D. Both devices maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

The UCC28512DWR carries Active product status, providing long-term availability and supply chain stability compared to the Last Time Buy status of the UCC29950D. This substitution is supported by Texas Instruments as a direct alternative for PFC control applications.

Design implementation of the UCC28512DWR requires consideration of the following differences: the 20-SOIC package is larger than the 16-SOIC package of the original device, necessitating PCB layout modifications. The higher switching frequency (200kHz) and Average Current control mode differ from the original CCM operation at 87kHz ~ 109kHz. The upper operating temperature limit is reduced from 125°C to 105°C.

Frequently Asked Questions (FAQ)

Q: Can the UCC28512DWR be used as a direct pin-for-pin replacement for the UCC29950D?

A: No. The UCC28512DWR uses a 20-SOIC package compared to the 16-SOIC package of the UCC29950D. Pin count and pinout differ, requiring schematic and PCB redesign.

Q: What are the key functional differences between these two PFC controllers?

A: The UCC29950D operates in Continuous Conduction mode at 87kHz ~ 109kHz, while the UCC28512DWR uses Average Current control at 200kHz. These differences affect circuit design, component selection, and electromagnetic interference characteristics.

Q: Are both devices compliant with the same regulatory standards?

A: Both devices are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity ratings. Both are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: What is the impact of the different operating temperature ranges?

A: The UCC29950D supports operation up to 125°C, while the UCC28512DWR is rated to 105°C maximum. Applications requiring operation above 105°C cannot use the UCC28512DWR as a substitute.

Q: Does the UCC28512DWR support the same supply voltage range?

A: The UCC28512DWR supports 9.7V ~ 18V, which overlaps with the UCC29950D range of 11V ~ 18V. The UCC28512DWR extends the lower voltage limit to 9.7V, providing broader input voltage compatibility.

Q: Why is the UCC29950D classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued this product line. The UCC28512DWR represents the current-generation alternative for new designs and ongoing production requirements.