UCC38501DW Equivalent & Substitute Parts

Part Overview

The UCC38501DW is a Power Factor Correction (PFC) controller IC manufactured by Texas Instruments, designed for average current mode operation at 100kHz switching frequency. This device is classified as Last Time Buy, indicating end-of-life status. The UCC38501DW is housed in a 20-SOIC surface mount package and operates across a 9.7V to 18V supply voltage range, making it suitable for AC-DC power conversion applications requiring power factor correction.

Due to its Last Time Buy status, identifying functionally compatible substitute components is essential for design continuity and long-term supply chain planning.

Substiute Parts

UCC38501DW

Texas InstrumentsIn Stock: 2139UCC38501DW Datasheet

Current PartRFQ

UCC28512DWR

Texas InstrumentsIn Stock: 757UCC28512DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UCC38501DW is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Control Mode: Average Current (functional equivalence)
• Package Type: 20-SOIC form factor (mechanical compatibility)
• Supply Voltage Range: Minimum 9.7V ~ 18V overlap (electrical compatibility)
• Mounting Type: Surface Mount (assembly compatibility)

Allowable Parameter Variations:

• Switching Frequency: Higher frequencies (200kHz) are acceptable as they represent enhanced performance within the same functional class
• Startup Current: Lower values indicate improved efficiency and are acceptable
• Operating Temperature Range: Extended ranges provide broader operational capability
• Moisture Sensitivity Level: Lower MSL ratings indicate superior reliability

The UCC28512DWR qualifies as a direct substitute based on identical control mode, package geometry, overlapping supply voltage specifications, and surface mount compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: UCC28512DWR

The UCC28512DWR is the recommended substitute for the UCC38501DW based on the following engineering criteria:

• Functional Equivalence: Both devices operate in average current mode with identical 20-SOIC packaging and surface mount compatibility, ensuring direct PCB-level replacement capability.
• Supply Voltage Compatibility: Identical 9.7V to 18V supply voltage range eliminates power supply redesign requirements.
• Active Product Status: The UCC28512DWR is in active production with confirmed inventory availability (656 Pcs), providing long-term supply security compared to the Last Time Buy status of the UCC38501DW.
• Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements.
• Enhanced Specifications: The UCC28512DWR provides superior performance characteristics including 200kHz switching frequency, reduced 100 µA startup current, extended -40°C to 105°C operating temperature range, and MSL 1 moisture sensitivity rating.

Design Considerations: The higher switching frequency of the UCC28512DWR may require evaluation of output filter component values and PCB layout to optimize electromagnetic compatibility and thermal performance. However, the identical package footprint and voltage specifications support straightforward substitution.

Frequently Asked Questions (FAQ)

Q: Can the UCC28512DWR directly replace the UCC38501DW on existing PCBs?

A: Yes. Both devices use identical 20-SOIC package geometry with 0.295" width and 7.50mm dimensions. Pin-to-pin compatibility and surface mount footprint are identical, enabling direct PCB replacement without layout modifications.

Q: What is the impact of the 200kHz switching frequency in the UCC28512DWR compared to the 100kHz of the UCC38501DW?

A: The doubled switching frequency in the UCC28512DWR reduces output filter component size and improves transient response. Existing output filter designs may require recalculation of inductor and capacitor values to maintain equivalent performance. The higher frequency does not affect supply voltage or control mode compatibility.

Q: Are there supply voltage differences between these devices?

A: No. Both the UCC38501DW and UCC28512DWR operate across identical 9.7V to 18V supply voltage ranges. Power supply circuits require no modification for substitution.

Q: Why is the UCC28512DWR recommended despite the UCC38501DW's Last Time Buy status?

A: The UCC28512DWR is in active production with confirmed inventory availability, ensuring long-term supply continuity. The UCC38501DW's Last Time Buy designation indicates limited remaining stock and no future production, making the UCC28512DWR the appropriate choice for new designs and long-term applications.

Q: What are the differences in operating temperature ranges?

A: The UCC38501DW operates from 0°C to 70°C, while the UCC28512DWR extends this range to -40°C to 105°C. For applications within the 0°C to 70°C window, both devices are functionally equivalent. For extended temperature applications, the UCC28512DWR provides broader operational capability.

Q: How do the moisture sensitivity levels differ?

A: The UCC38501DW has MSL 2 rating with 1-year shelf life, while the UCC28512DWR has MSL 1 rating with unlimited shelf life. MSL 1 indicates superior moisture resistance and longer storage capability without baking requirements, reducing component handling complexity.

Q: Are both devices RoHS compliant?

A: Yes. Both the UCC38501DW and UCC28512DWR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.