UCC2803MDREP Equivalent & Substitute Parts

Part Overview

The UCC2803MDREP is an active PWM controller manufactured by Texas Instruments, designed for multiple topology power supply applications. This 8-SOIC surface mount device operates across a wide temperature range (-55°C to 125°C) and is classified as Active product status with full RoHS3 compliance. The need for equivalent and substitute parts arises from supply chain considerations, inventory availability, and application-specific topology requirements where alternative controllers may better match specific power conversion topologies such as boost, flyback, or buck configurations.

Substiute Parts

UCC2803MDREP

Texas InstrumentsIn Stock: 5393UCC2803MDREP Datasheet

Current PartRFQ

ISL6843IBZ-T

Renesas Electronics CorporationIn Stock: 17765ISL6843IBZ-T Datasheet

MFR RecommendedRFQ

LT1246CS8#PBF

Analog Devices Inc.In Stock: 1445LT1246CS8#PBF Datasheet

MFR RecommendedRFQ

LT1247CS8#PBF

Analog Devices Inc.In Stock: 2968LT1247CS8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCC2803MDREP is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility without layout modifications.

Supply Voltage Range: The UCC2803MDREP operates at 3.6V ~ 12V. Substitute parts must support overlapping or compatible supply voltage ranges to function within the same power supply design.

Operating Temperature Range: The UCC2803MDREP supports -55°C ~ 125°C. Substitute parts with narrower temperature ranges may be acceptable depending on application requirements, but extended range capability is preferred for industrial applications.

Product Status and Compliance: All substitute parts must maintain Active product status and ROHS3 compliance to ensure long-term availability and regulatory adherence.

Topology Flexibility: While the UCC2803MDREP is a multi-topology PWM controller, substitute parts may be optimized for specific topologies (boost, flyback, buck). Selection depends on the target application topology.

Parameter Comparison

Engineering Selection Recommendations

ISL6843IBZ-T (Renesas Electronics): This substitute is suitable for applications requiring boost or flyback topology conversion. The supply voltage range of 9V ~ 16V overlaps with the upper portion of the UCC2803MDREP range. The operating temperature range (-40°C ~ 105°C) is narrower, making it appropriate for commercial and industrial environments but not extended military temperature applications. Moisture sensitivity level 3 requires controlled storage conditions. This part is recommended when boost or flyback topologies are the primary requirement.

LT1246CS8#PBF (Analog Devices): This offline buck converter controller operates at 10V ~ 25V supply voltage, which does not overlap with the lower end of the UCC2803MDREP range (3.6V). The operating temperature range (0°C ~ 100°C) is narrower than the main part. This substitute is applicable only for buck topology applications with higher input voltage requirements and commercial temperature ranges. Moisture sensitivity level 1 provides superior storage flexibility.

LT1247CS8#PBF (Analog Devices): This buck regulator controller operates at 8.4V ~ 25V supply voltage, providing better overlap with the UCC2803MDREP lower voltage range. The operating temperature range (0°C ~ 100°C) is narrower. This substitute is applicable for buck topology applications with commercial temperature requirements. Moisture sensitivity level 1 provides superior storage flexibility compared to the ISL6843IBZ-T.

All substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory compliance and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can ISL6843IBZ-T replace UCC2803MDREP in all applications?

A: No. The ISL6843IBZ-T is optimized for boost and flyback topologies, while the UCC2803MDREP is a multi-topology controller. Additionally, the ISL6843IBZ-T supply voltage range (9V ~ 16V) does not cover the lower voltage operation (3.6V ~ 9V) of the UCC2803MDREP. Substitution is valid only for boost or flyback applications within the overlapping voltage range.

Q: Are LT1246CS8#PBF and LT1247CS8#PBF interchangeable?

A: Both are buck topology controllers in 8-SOIC packages with identical moisture sensitivity levels. However, LT1246CS8#PBF operates at 10V ~ 25V while LT1247CS8#PBF operates at 8.4V ~ 25V. LT1247CS8#PBF provides broader voltage coverage and is preferred for applications requiring lower input voltage operation.

Q: What is the impact of different operating temperature ranges?

A: The UCC2803MDREP supports -55°C ~ 125°C, covering military and extended industrial temperature ranges. Substitute parts with narrower ranges (0°C ~ 100°C or -40°C ~ 105°C) are suitable for commercial and standard industrial applications but not for extreme temperature environments. Application temperature requirements must be verified before substitution.

Q: Does moisture sensitivity level affect substitution decisions?

A: Yes. The UCC2803MDREP and both Analog Devices parts (LT1246CS8#PBF, LT1247CS8#PBF) have MSL 1 (Unlimited), allowing indefinite shelf life under controlled conditions. The ISL6843IBZ-T has MSL 3 (168 Hours), requiring more stringent storage and handling protocols. For high-volume or long-term inventory applications, MSL 1 parts are preferred.

Q: Can these parts be used interchangeably on the same PCB?

A: All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprints and pin spacing. However, pin functionality and control signal requirements may differ between topologies. Schematic and control circuit modifications may be necessary depending on the target topology and application requirements.