UCC28C43D Equivalent & Substitute Parts

Part Overview

The UCC28C43D is a Boost, Flyback, Forward Converter Regulator IC manufactured by Texas Instruments, designed for positive output step-up and step-up/step-down DC-DC control applications. This 8-SOIC surface mount device operates as a transistor driver with frequency control capabilities across multiple converter topologies.

The UCC28C43D is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. Substitute parts must maintain electrical compatibility across core parameters including supply voltage range, switching frequency, duty cycle, output configuration, and package specifications to ensure functional equivalence in existing circuit designs.

Substiute Parts

UCC28C43D

Texas InstrumentsIn Stock: 2136UCC28C43D Datasheet

Current PartRFQ

UCC28C43DR

Texas InstrumentsIn Stock: 55211UCC28C43DR Datasheet

MFR RecommendedRFQ

UC2842BD1

STMicroelectronicsIn Stock: 4264UC2842BD1 Datasheet

MFR RecommendedRFQ

UC2842BD1013TR

STMicroelectronicsIn Stock: 10218UC2842BD1013TR Datasheet

MFR RecommendedRFQ

UC2843BD1

STMicroelectronicsIn Stock: 1971UC2843BD1 Datasheet

MFR RecommendedRFQ

UC2843BD1013TR

STMicroelectronicsIn Stock: 32981UC2843BD1013TR Datasheet

MFR RecommendedRFQ

UC3842BD1013TR

STMicroelectronicsIn Stock: 5000170UC3842BD1013TR Datasheet

MFR RecommendedRFQ

UC3843BD1

STMicroelectronicsIn Stock: 2434UC3843BD1 Datasheet

MFR RecommendedRFQ

UC3843BD1013TR

STMicroelectronicsIn Stock: 5000212UC3843BD1013TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UCC28C43D are evaluated based on the following critical parameters that determine functional equivalence:

Primary Compatibility Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) — all substitutes must match this package specification
• Output Type: Transistor Driver
• Output Configuration: Positive
• Duty Cycle (Max): 96%
• Control Features: Frequency Control
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Secondary Compatibility Criteria:

• Voltage - Supply (Vcc/Vdd): Substitute range must encompass or exceed the original 7.6V ~ 18V range
• Frequency - Switching: Substitute must support up to 1MHz operation
• Topology: Substitutes supporting Boost and/or Flyback topologies are acceptable
• Operating Temperature: Extended temperature range preferred for industrial applications

All identified substitutes meet the primary compatibility criteria. Variations in supply voltage range, switching frequency ceiling, and operating temperature represent acceptable trade-offs based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: UCC28C43DR

The UCC28C43DR is the direct active equivalent manufactured by Texas Instruments. This part maintains identical electrical specifications to the UCC28C43D, including supply voltage range (7.6V ~ 18V), switching frequency capability (up to 1MHz), and operating temperature range (-40°C ~ 105°C). The only difference is packaging format: UCC28C43DR is supplied in Cut Tape (CT) & Digi-Reel format versus the original Tube packaging. This substitute provides the highest compatibility for direct replacement in existing designs.

Secondary Substitutes: UC2843BD1, UC2843BD1013TR, UC3843BD1, UC3843BD1013TR

These STMicroelectronics UC2843 and UC3843 series parts provide functional equivalence with acceptable parameter variations. All maintain the 8-SOIC package, 96% maximum duty cycle, and frequency control features. The UC2843 series supports supply voltage range of 7.6V ~ 30V, exceeding the original specification. The UC3843 series similarly supports 7.6V ~ 30V. All operate at switching frequencies up to 500kHz, which is lower than the original 1MHz capability but suitable for most boost and flyback converter applications. These parts are available in both Tube and Cut Tape packaging options.

Tertiary Substitutes: UC2842BD1, UC2842BD1013TR, UC3842BD1013TR

The UC2842 and UC3842 series parts are compatible alternatives with supply voltage range of 10V ~ 30V. The minimum supply voltage of 10V exceeds the original 7.6V specification, which may limit applicability in designs requiring lower input voltage operation. These parts are suitable for applications where the 10V minimum supply voltage is acceptable.

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the original part's regulatory compliance profile. Selection should prioritize product status (active versus obsolete) and packaging availability for production requirements.

Frequently Asked Questions (FAQ)

Q: Can UC2843BD1 or UC3843BD1 directly replace UCC28C43D in my existing design?

A: Yes, with package compatibility verification. All substitute parts use the same 8-SOIC package. However, the UC2843 and UC3843 series operate at maximum switching frequencies of 500kHz compared to the UCC28C43D's 1MHz capability. If your design operates at frequencies below 500kHz, substitution is straightforward. Designs requiring 1MHz operation should prioritize UCC28C43DR for frequency compatibility.

Q: What is the difference between UC2843BD1 and UC2843BD1013TR?

A: Both parts are electrically identical UC2843 controllers. The primary difference is packaging format: UC2843BD1 is supplied in Tube packaging, while UC2843BD1013TR is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on production requirements and inventory management preferences.

Q: Why do some substitutes have a higher supply voltage minimum (10V vs 7.6V)?

A: UC2842 and UC3842 series parts specify a 10V minimum supply voltage, while UC2843 and UC3843 series support 7.6V minimum. For applications requiring operation below 10V input, UC2843 or UC3843 variants are required. Designs operating above 10V can use any substitute without restriction.

Q: Is the UCC28C43DR the recommended substitute?

A: UCC28C43DR is the direct active equivalent from Texas Instruments, maintaining identical electrical specifications including 1MHz switching frequency capability and -40°C to 105°C operating temperature range. It is the preferred substitute for designs requiring exact parameter matching and highest compatibility assurance.

Q: Can I use UC3842BD1013TR in a design originally specified for UCC28C43D?

A: UC3842BD1013TR is compatible with the following considerations: it operates at 500kHz maximum switching frequency (versus 1MHz), supports 10V ~ 30V supply voltage (versus 7.6V ~ 18V), and operates at 0°C ~ 70°C temperature range (versus -40°C ~ 105°C). Verify that your application requirements fall within these parameter ranges before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all identified substitute parts carry ROHS3 compliance certification, matching the original UCC28C43D specification. All parts are also REACH unaffected, ensuring regulatory compliance for new designs and production continuity.