UCC28C45D Equivalent & Substitute Parts

Part Overview

The UCC28C45D 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 device operates as a transistor driver controller in an 8-SOIC surface mount package. The UCC28C45D is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from Texas Instruments and other manufacturers.

Substiute Parts

UCC28C45D

Texas InstrumentsIn Stock: 10289UCC28C45D Datasheet

Current PartRFQ

UCC28C45DR

Texas InstrumentsIn Stock: 17907UCC28C45DR Datasheet

MFR RecommendedRFQ

MIC38C45YM

Microchip TechnologyIn Stock: 3814MIC38C45YM Datasheet

MFR RecommendedRFQ

MIC38C45YM-TR

Microchip TechnologyIn Stock: 2036MIC38C45YM-TR Datasheet

MFR RecommendedRFQ

UC2845BD1G

onsemiIn Stock: 1194UC2845BD1G Datasheet

MFR RecommendedRFQ

UC2845BD1R2G

onsemiIn Stock: 45281UC2845BD1R2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

• Package compatibility: 8-SOIC form factor (0.154", 3.90mm Width)
• Supply voltage range: 7.6V ~ 18V minimum requirement
• Switching frequency capability: Up to 1MHz minimum
• Duty cycle maximum: 48% or greater
• Topology support: Boost, Flyback, and/or Forward Converter configurations
• Output configuration: Positive output capability
• Surface mount mounting type
• RoHS3 compliance

Substitute parts must maintain compatibility across these parameters to ensure functional equivalence in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

UCC28C45DR is the primary recommended substitute. It is manufactured by Texas Instruments, the original manufacturer of the UCC28C45D, and maintains identical electrical specifications including supply voltage range (7.6V ~ 18V), switching frequency capability (up to 1MHz), and duty cycle maximum (48%). The UCC28C45DR is active in production status, ensuring long-term availability and supply chain stability. Both devices are ROHS3 compliant and share the same 8-SOIC package footprint.

MIC38C45YM and MIC38C45YM-TR are active alternatives from Microchip Technology. These parts support an extended supply voltage range (7.6V ~ 20V) and higher duty cycle maximum (50%), providing additional design flexibility. The Microchip devices include synchronous rectifier capability and support buck topology in addition to boost, flyback, and forward converter topologies. Operating temperature range is reduced to -40°C ~ 85°C. Both are ROHS3 compliant with identical 8-SOIC packaging.

UC2845BD1R2G is an active onsemi alternative supporting boost and flyback topologies with an extended supply voltage range (7.6V ~ 30V). This device is ROHS3 compliant and available in 8-SOIC packaging. Operating temperature range is -25°C ~ 85°C. The UC2845BD1R2G does not support forward converter topology.

All substitute parts maintain ROHS3 compliance and surface mount 8-SOIC package compatibility with the original UCC28C45D.

Frequently Asked Questions (FAQ)

Q: Can UCC28C45DR be used as a direct replacement for UCC28C45D?

A: Yes. UCC28C45DR is manufactured by Texas Instruments and maintains identical electrical specifications: 7.6V ~ 18V supply voltage, up to 1MHz switching frequency, 48% maximum duty cycle, and -40°C ~ 105°C operating temperature range. Both use 8-SOIC packaging. The primary difference is product status: UCC28C45D is obsolete while UCC28C45DR is active.

Q: What are the key differences between Texas Instruments and Microchip alternatives?

A: UCC28C45DR (Texas Instruments) matches the original specifications exactly. MIC38C45YM and MIC38C45YM-TR (Microchip) offer extended supply voltage (7.6V ~ 20V vs. 7.6V ~ 18V), higher duty cycle maximum (50% vs. 48%), and include synchronous rectifier capability. Microchip devices operate at -40°C ~ 85°C versus -40°C ~ 105°C for the original. All three support boost, flyback, and forward converter topologies.

Q: Are there topology limitations with onsemi alternatives?

A: UC2845BD1R2G supports boost and flyback topologies only. It does not support forward converter topology. If forward converter operation is required, this device is not suitable. The onsemi part does support an extended supply voltage range (7.6V ~ 30V).

Q: Do all substitute parts use the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB footprint compatibility with the original UCC28C45D.

Q: What is the difference between MIC38C45YM and MIC38C45YM-TR?

A: Both are identical Microchip devices with the same electrical specifications. The difference is packaging format: MIC38C45YM is supplied in tube packaging, while MIC38C45YM-TR is supplied in tape and reel format. Electrical performance and pin configuration are identical.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original UCC28C45D.