UCC2803QDREP Equivalent & Substitute Parts

Part Overview

The UCC2803QDREP is a Power Management IC functioning as a PWM Controller for multiple converter topologies. Manufactured by Texas Instruments, this 8-SOIC surface mount device operates across a supply voltage range of 3.6V to 12V with a maximum supply current of 500 µA. The part is Active status and RoHS3 compliant, designed for applications requiring flexible power supply control across boost, flyback, and forward converter topologies. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific requirements.

Substiute Parts

UCC2803QDREP

Texas InstrumentsIn Stock: 908UCC2803QDREP Datasheet

Current PartRFQ

UCC2803QDRQ1

Texas InstrumentsIn Stock: 15987UCC2803QDRQ1 Datasheet

Parametric EquivalentRFQ

UCC2813QDR-3Q1

Texas InstrumentsIn Stock: 4434UCC2813QDR-3Q1 Datasheet

Parametric EquivalentRFQ

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 eligibility for the UCC2803QDREP is determined by the following critical parameters:

• Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout and assembly compatibility.
• Supply Voltage Range: Substitute parts must operate within or encompass the 3.6V to 12V supply voltage specification of the main part.
• Operating Temperature Range: Substitute parts must support the -40°C to 125°C operating temperature range or a compatible subset.
• Functional Classification: Substitute parts must function as PWM controllers or DC-DC converter controllers capable of supporting multiple topologies.
• Compliance Standards: All parts must maintain RoHS3 compliance and equivalent regulatory status (REACH Unaffected, EAR99 classification).

The identified substitute parts are grouped into two categories: parametric equivalents (UCC2803QDRQ1, UCC2813QDR-3Q1) and manufacturer-recommended alternatives (ISL6843IBZ-T, LT1246CS8#PBF, LT1247CS8#PBF). Parametric equivalents share the same base product number or identical electrical specifications. Manufacturer-recommended alternatives provide functional equivalence within the specified parameter constraints but may have different topological capabilities or supply voltage ranges.

Parameter Comparison

Engineering Selection Recommendations

UCC2803QDRQ1: This Texas Instruments part is a direct parametric equivalent with identical supply voltage range (3.6V ~ 11V encompasses the main part's 3.6V ~ 12V specification within practical operating margins), matching operating temperature range, and equivalent supply current. The primary distinction is automotive-grade qualification (AEC-Q100) and Cut Tape & Digi-Reel packaging versus Tape & Reel. Selection is appropriate for applications requiring automotive compliance or when standard-grade inventory is unavailable.

UCC2813QDR-3Q1: This Texas Instruments controller offers identical package and operating temperature specifications with automotive-grade qualification (AEC-Q100). Supply voltage range extends to 12V maximum, matching the main part. This part supports boost, flyback, and forward converter topologies with 99% maximum duty cycle. Selection is suitable for automotive applications or designs requiring enhanced topological flexibility.

ISL6843IBZ-T: This Renesas Electronics part provides boost and flyback converter control in 8-SOIC packaging. The supply voltage range (9V ~ 16V) does not fully encompass the main part's lower 3.6V specification, limiting substitution to applications operating above 9V. Operating temperature range is reduced to -40°C ~ 105°C. Synchronous rectifier capability and up to 2MHz switching frequency are additional features. Selection requires verification that application supply voltage remains above 9V minimum.

LT1246CS8#PBF: This Analog Devices offline buck converter operates at 10V ~ 25V supply voltage, exceeding the main part's upper specification. Operating temperature is limited to 0°C ~ 100°C. Topology is restricted to buck conversion with 100% duty cycle and up to 1MHz switching frequency. Selection is restricted to buck-only applications with supply voltage above 10V and operating temperature above 0°C.

LT1247CS8#PBF: This Analog Devices buck controller operates at 8.4V ~ 25V supply voltage with 1MHz switching frequency and 100% maximum duty cycle. Operating temperature range is 0°C ~ 100°C. Topology is limited to buck conversion. Selection is appropriate for buck-only applications with supply voltage above 8.4V and operating temperature above 0°C.

Frequently Asked Questions (FAQ)

Q: Can UCC2803QDRQ1 be used as a direct replacement for UCC2803QDREP?

A: Yes, within application constraints. Both parts share identical electrical specifications (3.6V ~ 11V/12V supply, 500 µA supply current, -40°C ~ 125°C operating range) and 8-SOIC packaging. The primary difference is automotive-grade qualification (AEC-Q100) on the UCC2803QDRQ1. Substitution is valid for standard industrial applications; automotive applications benefit from the qualified variant.

Q: What is the key limitation when substituting ISL6843IBZ-T?

A: The ISL6843IBZ-T supply voltage minimum is 9V, whereas the UCC2803QDREP operates from 3.6V. This part cannot be used in applications requiring supply voltages below 9V. Additionally, the operating temperature range is reduced to -40°C ~ 105°C, limiting use in applications requiring operation above 105°C.

Q: Are LT1246CS8#PBF and LT1247CS8#PBF suitable for multi-topology applications?

A: No. Both Analog Devices parts are restricted to buck topology conversion. The UCC2803QDREP supports multiple topologies (boost, flyback, forward). These parts are suitable only for buck-only converter designs. Additionally, both require minimum supply voltage of 8.4V to 10V, exceeding the UCC2803QDREP's 3.6V minimum.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring PCB layout compatibility. Packaging format variations (Tape & Reel, Cut Tape & Digi-Reel, Tube) do not affect electrical or mechanical compatibility on the PCB.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All identified substitute parts are RoHS3 compliant with REACH Unaffected status and EAR99 classification, matching the regulatory profile of the UCC2803QDREP.

Q: Which substitute part has the widest operating temperature range?

A: UCC2803QDRQ1 and UCC2813QDR-3Q1 both maintain the full -40°C ~ 125°C operating temperature range of the main part. ISL6843IBZ-T is limited to -40°C ~ 105°C, while LT1246CS8#PBF and LT1247CS8#PBF are limited to 0°C ~ 100°C.