UCC38C42P Equivalent & Substitute Parts

Part Overview

The UCC38C42P is an offline PWM controller IC manufactured by Texas Instruments, designed for boost, flyback, and forward converter topologies. This 8-DIP through-hole component operates with a supply voltage range of 9V to 18V and supports switching frequencies up to 1MHz with a maximum duty cycle of 96%. The UCC38C42P is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. Substitute components must maintain functional compatibility across power management applications while accommodating different packaging and operating specifications.

Substiute Parts

UCC38C42P

Texas InstrumentsIn Stock: 1347UCC38C42P Datasheet

Current PartRFQ

UCC38C42D

Texas InstrumentsIn Stock: 1619UCC38C42D Datasheet

MFR RecommendedRFQ

MIC38C42YN

Microchip TechnologyIn Stock: 1718MIC38C42YN Datasheet

MFR RecommendedRFQ

MIC38C44YN

Microchip TechnologyIn Stock: 1491MIC38C44YN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UCC38C42P are selected based on the following critical parameters that determine functional compatibility:

Core Electrical Parameters:

• Voltage supply range (9V ~ 18V minimum requirement)
• Switching frequency capability (up to 1MHz or higher)
• Duty cycle support (96% or greater)
• Topology support (Boost, Flyback, Forward Converter)
• Output type (Transistor Driver)

Packaging & Mounting Considerations:

• Package type (8-DIP through-hole preferred for direct replacement; 8-SOIC surface mount as alternative)
• Pin configuration compatibility

Compliance & Status:

• RoHS3 compliance
• Active or obsolete product status

The substitute parts listed below maintain electrical equivalence within these parameters while offering variations in packaging, operating temperature ranges, and manufacturer options.

Parameter Comparison

Engineering Selection Recommendations

Direct Through-Hole Replacement (Preferred for PCB Compatibility): MIC38C42YN is the primary substitute for UCC38C42P when through-hole mounting is required. Both components use 8-DIP packaging with identical physical dimensions (0.300", 7.62mm). The MIC38C42YN maintains the 96% maximum duty cycle and supports the required 9V to 20V supply range. The Microchip part offers an extended operating temperature range (-40°C to 150°C) compared to the original part (0°C to 70°C), providing improved thermal performance for industrial applications. Both parts are RoHS3 compliant and carry unlimited moisture sensitivity level (MSL 1).

Surface Mount Alternative: UCC38C42D provides functional equivalence with surface mount 8-SOIC packaging. This Texas Instruments part maintains identical electrical specifications to the UCC38C42P (9V ~ 18V supply, up to 1MHz switching frequency, 96% duty cycle) and is suitable for designs transitioning to surface mount assembly. The UCC38C42D is also obsolete but remains available in inventory.

Limited Duty Cycle Application: MIC38C44YN is functionally equivalent for applications with maximum 50% duty cycle requirements. This part supports the same topologies and supply voltage range but is limited to 50% maximum duty cycle compared to the 96% capability of the UCC38C42P. Selection of MIC38C44YN is appropriate only when circuit design specifications do not exceed 50% duty cycle operation.

Compliance Verification: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification, matching the regulatory profile of the original UCC38C42P.

Frequently Asked Questions (FAQ)

Q: Can UCC38C42D replace UCC38C42P directly on the PCB? A: UCC38C42D is electrically equivalent but uses 8-SOIC surface mount packaging instead of 8-DIP through-hole. Direct PCB replacement is not possible without layout modification. The part is suitable for new designs using surface mount assembly.

Q: What is the key difference between MIC38C42YN and MIC38C44YN? A: Both Microchip parts use identical 8-DIP through-hole packaging and support the same topologies and supply voltage range. The critical difference is maximum duty cycle: MIC38C42YN supports 96% duty cycle, while MIC38C44YN is limited to 50% duty cycle. Selection depends on your circuit's duty cycle requirements.

Q: Does MIC38C42YN work in all UCC38C42P applications? A: MIC38C42YN maintains electrical compatibility across boost, flyback, and forward converter topologies with equivalent supply voltage range (9V ~ 20V), switching frequency (500kHz), and duty cycle (96%) specifications. The extended operating temperature range (-40°C to 150°C) provides broader environmental compatibility. Pin configuration and functional behavior are compatible for direct substitution in through-hole designs.

Q: Are there supply voltage differences between substitutes? A: UCC38C42P and UCC38C42D operate within 9V ~ 18V supply range. MIC38C42YN and MIC38C44YN extend this to 9V ~ 20V, providing additional headroom for higher input voltage applications. Both ranges are compatible with standard offline converter designs.

Q: What is the switching frequency difference between the original and Microchip substitutes? A: UCC38C42P supports switching frequencies up to 1MHz. MIC38C42YN and MIC38C44YN operate at 500kHz fixed frequency. Applications requiring frequencies above 500kHz must use UCC38C42D or remain with the original UCC38C42P if available.

Q: Are all parts RoHS compliant? A: All listed parts (UCC38C42P, UCC38C42D, MIC38C42YN, MIC38C44YN) are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1), meeting current environmental and regulatory requirements.