UCC28C45P Equivalent & Substitute Parts

Part Overview

The UCC28C45P is a Power Management IC (PMIC) controller manufactured by Texas Instruments, designed for boost, flyback, and forward converter topologies. It functions as a transistor driver for step-up and step-up/step-down DC-DC conversion applications with positive output configuration. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

UCC28C45P

Texas InstrumentsIn Stock: 5621UCC28C45P Datasheet

Current PartRFQ

UCC28C45D

Texas InstrumentsIn Stock: 10289UCC28C45D Datasheet

MFR RecommendedRFQ

UC2845BNG

onsemiIn Stock: 50129UC2845BNG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UCC28C45P are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Voltage Supply Range: 7.6V ~ 18V (UCC28C45P) must be compatible with substitute parts
• Switching Frequency: Up to 1MHz capability required
• Duty Cycle: 48% maximum
• Output Configuration: Positive output, transistor driver type
• Topology Support: Boost, Flyback, Forward Converter capability
• Operating Temperature Range: -40°C ~ 105°C (TJ)
• Package Compatibility: Through-hole 8-DIP or surface-mount equivalents with identical pinout and electrical function

Two substitute parts meet these criteria with documented compatibility:

1. UCC28C45D (Texas Instruments) – Same base product number, surface-mount variant with identical electrical specifications
2. UC2845BNG (onsemi) – Cross-manufacturer equivalent with compatible topology support and electrical parameters

Parameter Comparison

Engineering Selection Recommendations

UCC28C45D is the primary substitute for direct replacement in surface-mount applications. It maintains identical electrical specifications, supply voltage range, switching frequency capability, and operating temperature range as the UCC28C45P. Both parts share the same base product number (UCC28C45) and are manufactured by Texas Instruments. The only difference is the package format (8-SOIC versus 8-DIP). Both parts are ROHS3 compliant and carry identical regulatory status. However, UCC28C45D is also classified as obsolete.

UC2845BNG is a cross-manufacturer equivalent suitable for through-hole applications requiring continued product support. Manufactured by onsemi, this part maintains active product status, ensuring long-term availability and supply chain stability. It supports the same topologies (Boost, Flyback) and duty cycle specifications. The UC2845BNG operates across a wider supply voltage range (7.6V ~ 30V) and supports lower operating temperatures (-25°C ~ 85°C ambient). The maximum switching frequency is 500kHz, which is lower than the UCC28C45P's 1MHz capability. This frequency difference must be evaluated against specific application requirements.

For legacy system maintenance where the original through-hole package is required and component availability is critical, UC2845BNG provides the advantage of active product status and broader supply voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can UCC28C45D replace UCC28C45P directly on a PCB?

A: UCC28C45D cannot be used as a direct pin-for-pin replacement on existing through-hole PCBs designed for UCC28C45P. UCC28C45D uses 8-SOIC surface-mount packaging, while UCC28C45P uses 8-DIP through-hole packaging. PCB redesign or adapter solutions are required for physical mounting. Electrical functionality is identical.

Q: What is the key difference between UCC28C45P and UC2845BNG?

A: Both parts support boost and flyback topologies with 48% maximum duty cycle and identical 7.6V minimum supply voltage. The primary differences are: (1) UC2845BNG has a maximum supply voltage of 30V versus 18V for UCC28C45P, (2) UC2845BNG switching frequency is limited to 500kHz versus 1MHz for UCC28C45P, and (3) UC2845BNG maintains active product status while UCC28C45P is obsolete. UC2845BNG operates at lower ambient temperatures (-25°C to 85°C) compared to UCC28C45P's junction temperature range (-40°C to 105°C).

Q: Are all three parts ROHS3 compliant?

A: Yes. UCC28C45P, UCC28C45D, and UC2845BNG are all ROHS3 compliant with REACH unaffected status.

Q: Which substitute should I choose for a new design?

A: UC2845BNG is recommended for new designs due to its active product status, ensuring long-term availability and supply chain continuity. It supports the required boost and flyback topologies with adequate switching frequency for most applications. Verify that the 500kHz maximum switching frequency meets your application requirements, as this is lower than the UCC28C45P specification.

Q: Can UC2845BNG operate at the same temperature range as UCC28C45P?

A: No. UC2845BNG operates from -25°C to 85°C ambient temperature, while UCC28C45P operates from -40°C to 105°C junction temperature. Applications requiring operation below -25°C or above 85°C ambient may not be suitable for UC2845BNG without thermal management evaluation.