UCC28C43P Equivalent & Substitute Parts

Part Overview

The UCC28C43P is a DC-DC controller IC manufactured by Texas Instruments, designed for boost, flyback, and forward converter topologies with positive output configuration. This component functions as a transistor driver for step-up and step-up/step-down applications. The UCC28C43P is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across topology support, output configuration, and electrical operating parameters.

Substiute Parts

UCC28C43P

Texas InstrumentsIn Stock: 5366UCC28C43P Datasheet

Current PartRFQ

UCC28C43D

Texas InstrumentsIn Stock: 2136UCC28C43D Datasheet

MFR RecommendedRFQ

UC2842BN

STMicroelectronicsIn Stock: 2676UC2842BN Datasheet

MFR RecommendedRFQ

UC2843BN

STMicroelectronicsIn Stock: 20539UC2843BN Datasheet

MFR RecommendedRFQ

UC3842BN

STMicroelectronicsIn Stock: 55131UC3842BN Datasheet

MFR RecommendedRFQ

UC3843BN

STMicroelectronicsIn Stock: 60377UC3843BN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the UCC28C43P is based on the following critical parameters that determine functional compatibility:

Core Functional Parameters:

• Output Type: Transistor Driver
• Function: Step-Up, Step-Up/Step-Down capability
• Output Configuration: Positive output
• Topology Support: Boost and Flyback (minimum requirement)
• Number of Outputs: 1
• Output Phases: 1
• Control Features: Frequency Control

Electrical Operating Parameters:

• Voltage Supply Range: Must overlap or encompass 7.6V ~ 18V
• Switching Frequency: Up to 500kHz minimum (1MHz preferred)
• Duty Cycle (Max): 96%
• Operating Temperature: Must support -40°C ~ 105°C range or subset thereof

Physical & Compliance Parameters:

• Mounting Type: Through Hole (primary) or Surface Mount (alternative)
• Package: 8-DIP or 8-SOIC
• RoHS3 Compliance: Required
• MSL Level: 1 (Unlimited)

Substitute parts are grouped into two categories:

Group 1 - Direct Functional Equivalent (Same Topology Support): UCC28C43D - Surface mount variant of the same base product (UCC28C43), maintains all functional parameters with different packaging.

Group 2 - Compatible Functional Substitutes (Boost/Flyback Support): UC2842BN, UC2843BN, UC3842BN, UC3843BN - These parts support boost and flyback topologies with positive output configuration. All are through-hole mounted 8-DIP packages. Electrical parameters overlap within acceptable ranges for most applications, though operating temperature and supply voltage ranges vary.

Parameter Comparison

Engineering Selection Recommendations

UCC28C43D is the primary substitute for direct replacement in new designs. As the surface-mount variant of the same base product (UCC28C43), it maintains identical electrical specifications and functional capabilities. Both parts are obsolete, but UCC28C43D offers superior availability (2100 pcs in stock versus 5345 pcs for UCC28C43P). The transition from through-hole to surface-mount packaging requires PCB redesign but eliminates the need for mechanical mounting hardware.

UC2843BN is the recommended active substitute when long-term availability is critical. This STMicroelectronics part supports boost and flyback topologies with positive output configuration and maintains the 8-DIP through-hole package format. Supply voltage range (7.6V ~ 30V) encompasses the UCC28C43P requirement. Operating temperature range (-25°C ~ 85°C) is narrower than the original part but suitable for most industrial applications. Inventory availability is substantial (20527 pcs in stock).

UC3843BN provides an alternative active substitute with identical topology support and package format to UC2843BN. Supply voltage range (7.6V ~ 30V) and switching frequency (up to 500kHz) are equivalent. Operating temperature range (0°C ~ 70°C) is more restrictive, limiting use in extended temperature applications. Inventory is highest among all substitutes (60300 pcs in stock).

UC2842BN and UC3842BN are suitable substitutes for applications with higher supply voltage requirements (10V minimum). UC2842BN operates at -25°C ~ 85°C, while UC3842BN is limited to 0°C ~ 70°C. Both support boost and flyback topologies in 8-DIP packages. These parts are appropriate when supply voltage remains above 10V throughout operation.

All substitute parts maintain ROHS3 compliance, MSL Level 1, and REACH unaffected status, ensuring regulatory alignment with the original UCC28C43P.

Frequently Asked Questions (FAQ)

Q: Can UCC28C43D replace UCC28C43P directly on the existing PCB?

A: UCC28C43D cannot be used as a direct drop-in replacement due to package differences. UCC28C43P uses 8-DIP through-hole packaging, while UCC28C43D uses 8-SOIC surface-mount packaging. PCB redesign is required to accommodate the different pin layout and mounting method. However, electrical functionality and specifications are identical.

Q: What is the key difference between UC2843BN and UC3843BN?

A: Both parts support identical topologies (boost, flyback) and use the same 8-DIP package. The primary difference is operating temperature range: UC2843BN operates from -25°C to 85°C, while UC3843BN operates from 0°C to 70°C. For applications requiring extended low-temperature operation below 0°C, UC2843BN is the appropriate choice.

Q: Why do some substitutes have lower maximum switching frequency (500kHz vs 1MHz)?

A: The UCC28C43P supports switching frequencies up to 1MHz, while UC2842BN, UC2843BN, UC3842BN, and UC3843BN are limited to 500kHz. Applications designed for the UCC28C43P operating above 500kHz cannot use these substitutes without circuit redesign. For applications operating at or below 500kHz, this limitation does not affect compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (UCC28C43D, UC2842BN, UC2843BN, UC3842BN, UC3843BN) are ROHS3 compliant with MSL Level 1 (unlimited moisture sensitivity). All parts maintain REACH unaffected status, ensuring regulatory compliance across EU and international markets.

Q: Which substitute offers the best long-term availability?

A: UC3843BN provides the highest inventory availability (60300 pcs in stock) and is classified as active product status, ensuring continued manufacturing and supply. UC2843BN is the second choice with 20527 pcs in stock and active status. Both UCC28C43D and UCC28C43P are obsolete, making them less suitable for new long-term production commitments.

Q: Can I use UC2842BN if my supply voltage is 8V?

A: No. UC2842BN requires minimum supply voltage of 10V. The UCC28C43P and UC2843BN both support 7.6V minimum supply voltage. For applications with supply voltage below 10V, UC2843BN or UCC28C43D must be used instead of UC2842BN.

Q: What is the significance of "Isolation Capable" in the output configuration?

A: UC2842BN, UC2843BN, UC3842BN, and UC3843BN are rated as "Isolation Capable," meaning they can be used in isolated topologies such as flyback converters with isolated secondary windings. The UCC28C43P does not carry this designation but supports flyback topology. This difference does not prevent substitution in standard boost or non-isolated flyback applications.