UCC2804D/81221 Equivalent & Substitute Parts

Part Overview

The UCC2804D/81221 is an offline switch PWM controller manufactured by Texas Instruments, designed for power supply applications requiring multi-topology support. This 8-SOIC surface mount device operates as a power management IC with input voltage range of -0.3V to 6.3V and supply voltage of 8.3V to 11V. The product is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 8-SOIC package format and support equivalent PWM control functionality across supported topologies.

Substiute Parts

UCC2804D/81221

Texas InstrumentsIn Stock: 1164UCC2804D/81221 Datasheet

Current PartRFQ

ISL6842IBZ-T

Renesas Electronics CorporationIn Stock: 5504ISL6842IBZ-T Datasheet

MFR RecommendedRFQ

ISL6843IBZ-T

Renesas Electronics CorporationIn Stock: 17765ISL6843IBZ-T Datasheet

MFR RecommendedRFQ

MIC38C44AYM

Microchip TechnologyIn Stock: 3507MIC38C44AYM Datasheet

MFR RecommendedRFQ

MIC38C44AYM-TR

Microchip TechnologyIn Stock: 780MIC38C44AYM-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UCC2804D/81221 are selected based on the following critical parameters that determine functional compatibility:

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

Voltage Supply Range: Substitute parts must operate within overlapping supply voltage specifications. The main part operates at 8.3V to 11V; substitute parts with supply ranges of 8.8V to 18V, 9V to 16V, or 9V to 20V provide adequate overlap for typical offline switch applications.

Operating Temperature Range: Substitute parts must support the industrial temperature range of -40°C to 125°C minimum. Parts rated to -40°C to 105°C or -40°C to 150°C meet this requirement.

Compliance Standards: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to ensure regulatory alignment with the original part.

Functional Category: Substitute parts must be classified as Power Management (PMIC) controllers supporting offline switch or PWM control functionality.

Parameter Comparison

Engineering Selection Recommendations

ISL6842IBZ-T (Renesas Electronics): Active product status with supply voltage range 8.8V to 18V and operating temperature -40°C to 105°C. MSL rating of 1 (Unlimited) matches the original part. Suitable for applications where the upper temperature limit of 105°C is acceptable and extended supply voltage headroom is beneficial.

ISL6843IBZ-T (Renesas Electronics): Active product status with supply voltage range 9V to 16V and operating temperature -40°C to 105°C. MSL rating of 3 (168 Hours) requires controlled storage conditions. Recommended for applications with adequate thermal management and where moisture sensitivity handling procedures are established.

MIC38C44AYM (Microchip Technology): Active product status with supply voltage range 9V to 20V and extended operating temperature -40°C to 150°C. MSL rating of 1 (Unlimited) provides maximum flexibility. Packaging in Tube format. Suitable for high-temperature applications and designs requiring extended supply voltage tolerance.

MIC38C44AYM-TR (Microchip Technology): Active product status with identical electrical specifications to MIC38C44AYM. Packaging in Tape & Reel (TR) format for automated assembly processes. Select this variant for high-volume production requiring reel packaging.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity with the obsolete UCC2804D/81221.

Frequently Asked Questions (FAQ)

Q: Can I directly replace UCC2804D/81221 with any of these substitute parts without PCB modification?

A: Yes, all substitute parts use the identical 8-SOIC (0.154", 3.90mm Width) package, enabling direct pin-compatible replacement without PCB layout changes. Verify pinout compatibility with the specific substitute part datasheet before assembly.

Q: What is the primary reason to select substitute parts for the UCC2804D/81221?

A: The UCC2804D/81221 is classified as obsolete. Substitute parts are necessary for new production runs, design updates, and long-term supply chain continuity. All listed substitutes are active products with established manufacturing support.

Q: How do supply voltage ranges affect substitute part selection?

A: The original part operates at 8.3V to 11V. All substitute parts have supply ranges that overlap or exceed this specification. ISL6842IBZ-T (8.8V to 18V), ISL6843IBZ-T (9V to 16V), and MIC38C44AYM/MIC38C44AYM-TR (9V to 20V) all provide adequate margin. Select based on your circuit's actual supply voltage requirements.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) parts like UCC2804D/81221, ISL6842IBZ-T, MIC38C44AYM, and MIC38C44AYM-TR require no special moisture control during storage. ISL6843IBZ-T with MSL 3 (168 Hours) requires storage in controlled humidity conditions and has a 168-hour floor life after opening. Select MSL 1 parts for simplified supply chain handling unless your process already manages MSL 3 components.

Q: Are there packaging format differences between substitute parts?

A: Yes. MIC38C44AYM is supplied in Tube format, while MIC38C44AYM-TR is supplied in Tape & Reel (TR) format. Both are identical electrically. Choose Tube for manual assembly or small quantities; choose Tape & Reel for automated high-volume production.

Q: Do all substitute parts support the same operating temperature range as the original?

A: No. The original UCC2804D/81221 operates to 125°C. ISL6842IBZ-T and ISL6843IBZ-T are rated to 105°C maximum. MIC38C44AYM and MIC38C44AYM-TR extend to 150°C. Verify your application's thermal requirements before selection.