UCC2804DTR/81221 Equivalent & Substitute Parts

Part Overview

The UCC2804DTR/81221 is a PWM Controller IC manufactured by Texas Instruments, designed for offline switch mode power supply applications. This 8-SOIC surface mount device operates as a power management controller supporting multiple converter topologies. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Substitute parts must maintain compatibility with the original electrical specifications and package form factor while offering active product status and extended availability.

Key Parameters

Parameter	UCC2804DTR/81221
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	8.3V ~ 11V
Current - Supply	500 µA
Operating Temperature	-40°C ~ 125°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the UCC2804DTR/81221 are selected based on the following critical parameters that determine functional compatibility:

Package / Case: All substitutes must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout compatibility
Voltage - Supply Range: Substitute parts must operate within or encompass the original 8.3V ~ 11V supply voltage range
Operating Temperature Range: Substitutes must support the -40°C ~ 125°C operating temperature minimum
Surface Mount Compatibility: All substitutes must be surface mount devices suitable for automated assembly
RoHS3 Compliance: All substitutes maintain ROHS3 compliance for regulatory alignment
Functional Category: Substitutes must be PWM controllers or offline switch mode power supply controllers

The four qualified substitute parts (ISL6842IBZ-T, ISL6843IBZ-T, MIC38C44AYM, MIC38C44AYM-TR) meet these core compatibility criteria while offering active product status and improved availability.

Parameter Comparison

Parameter	UCC2804DTR/81221	ISL6842IBZ-T	ISL6843IBZ-T	MIC38C44AYM	MIC38C44AYM-TR
Manufacturer	Texas Instruments	Renesas Electronics	Renesas Electronics	Microchip Technology	Microchip Technology
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply (Vcc/Vdd)	8.3V ~ 11V	8.8V ~ 18V	9V ~ 16V	9V ~ 20V	9V ~ 20V
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All four substitute parts are classified as active products with ROHS3 compliance, providing regulatory continuity with the obsolete UCC2804DTR/81221. Selection among substitutes depends on specific application requirements:

ISL6842IBZ-T and ISL6843IBZ-T (Renesas Electronics): Both parts support extended supply voltage ranges (8.8V ~ 18V and 9V ~ 16V respectively) and operate up to 2MHz switching frequency. ISL6843IBZ-T includes synchronous rectifier capability. Operating temperature range is -40°C ~ 105°C.

MIC38C44AYM and MIC38C44AYM-TR (Microchip Technology): Both variants support the widest supply voltage range (9V ~ 20V) and highest operating temperature range (-40°C ~ 150°C). These parts operate at 500kHz switching frequency with internal switches. The primary difference is packaging: MIC38C44AYM uses Tube packaging while MIC38C44AYM-TR uses Tape & Reel (TR) packaging for automated assembly.

All substitutes maintain 8-SOIC package compatibility and surface mount mounting type. MSL ratings of 1 (Unlimited) for ISL6842IBZ-T, MIC38C44AYM, and MIC38C44AYM-TR provide superior moisture handling compared to ISL6843IBZ-T (MSL 3, 168 Hours).

Frequently Asked Questions (FAQ)

Q: Why is the UCC2804DTR/81221 being replaced? A: The UCC2804DTR/81221 is classified as obsolete. Substitute parts provide active product status, extended availability, and continued manufacturing support.

Q: Are all substitute parts pin-compatible with the original UCC2804DTR/81221? A: All substitute parts use the same 8-SOIC package form factor. Pin-level compatibility must be verified against specific application schematics and datasheet pinout diagrams.

Q: What is the key difference between ISL6842IBZ-T and ISL6843IBZ-T? A: ISL6843IBZ-T includes synchronous rectifier capability and supports Boost and Flyback topologies with isolation capability. ISL6842IBZ-T supports Boost, Buck, and Flyback topologies without synchronous rectifier. Both operate up to 2MHz.

Q: How do the Microchip MIC38C44AYM variants differ? A: MIC38C44AYM and MIC38C44AYM-TR are electrically identical. The difference is packaging: MIC38C44AYM uses Tube packaging for manual handling, while MIC38C44AYM-TR uses Tape & Reel packaging optimized for automated assembly lines.

Q: Which substitute offers the widest operating temperature range? A: MIC38C44AYM and MIC38C44AYM-TR both support -40°C ~ 150°C operating temperature, compared to -40°C ~ 125°C for the original part and -40°C ~ 105°C for Renesas alternatives.

Q: What does MSL rating mean for component selection? A: Moisture Sensitivity Level (MSL) indicates how long a component can be exposed to moisture before soldering. MSL 1 (Unlimited) parts have no time restrictions. ISL6843IBZ-T has MSL 3 (168 Hours), requiring storage in dry conditions and limiting shelf life after moisture exposure.

Q: Are all substitutes RoHS3 compliant? A: Yes, all substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with the original UCC2804DTR/81221.

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