UC2879NG4 Equivalent & Substitute Parts

Part Overview

The UC2879NG4 is an offline switch full-bridge converter IC manufactured by Texas Instruments, designed for power management applications requiring full-bridge topology operation at 300kHz switching frequency. This device operates with a supply voltage range of 9.25V to 20V and includes integrated current limiting fault protection with frequency control, soft start, and synchronization features.

The UC2879NG4 is discontinued at DiGi Electronics, necessitating identification of equivalent substitute components that maintain functional and electrical compatibility for existing designs or new implementations requiring this topology class.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Topology	Full-Bridge
Voltage Supply Range (Vcc/Vdd)	9.25V ~ 20V
Switching Frequency	300kHz
Duty Cycle	50%
Fault Protection	Current Limiting
Control Features	Frequency Control, Soft Start, Sync
Operating Temperature	-40°C ~ 85°C (TA)
Package Type	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Output Isolation	Non-Isolated
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the UC2879NG4 are identified based on the following critical parameters that determine functional equivalence:

Full-bridge topology architecture
Supply voltage compatibility within 9.25V ~ 20V range
Switching frequency operation at or near 300kHz
Current limiting fault protection capability
Frequency control and soft start control features
Non-isolated output configuration
Through-hole or compatible mounting for PCB integration
ROHS3 compliance and equivalent regulatory status

The UC2879N represents a direct manufacturer-recommended substitute, maintaining identical electrical specifications and package configuration. The UCC28951PWR provides an alternative full-bridge controller with extended operating temperature range and higher switching frequency capability, suitable for designs requiring enhanced thermal performance or higher frequency operation.

Parameter Comparison

Parameter	UC2879NG4	UC2879N	UCC28951PWR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Topology	Full-Bridge	Full-Bridge	Full-Bridge
Voltage Supply Range (Vcc/Vdd)	9.25V ~ 20V	9.25V ~ 20V	8V ~ 17V
Switching Frequency	300kHz	300kHz	Up to 1MHz
Duty Cycle	50%	50%	95% (Max)
Fault Protection	Current Limiting	Current Limiting	Not specified
Control Features	Frequency Control, Soft Start, Sync	Frequency Control, Soft Start, Sync	Enable, Frequency Control, Soft Start
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)
Package Type	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	24-TSSOP (0.173", 4.40mm Width)
Mounting Type	Through Hole	Through Hole	Surface Mount
Output Isolation	Non-Isolated	Non-Isolated	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Last Time Buy	Active

Engineering Selection Recommendations

UC2879N is the manufacturer-recommended direct substitute for UC2879NG4, providing identical electrical specifications, package configuration, and control feature set. This part maintains full compatibility with existing PCB layouts and design implementations. UC2879N is designated as Last Time Buy status, indicating limited availability for future procurement.

UCC28951PWR serves as an alternative full-bridge controller for applications where extended operating temperature range (-40°C to 125°C junction temperature) or higher switching frequency capability (up to 1MHz) provides design advantages. This part requires PCB redesign due to different package type (24-TSSOP surface mount versus 20-DIP through hole) and pin configuration. UCC28951PWR maintains Active product status, ensuring long-term availability and supply continuity.

All substitute parts maintain ROHS3 compliance and equivalent regulatory certifications (REACH Unaffected, ECCN EAR99, HTSUS 8542.39.0001).

Frequently Asked Questions (FAQ)

Q: Can UC2879N be used as a direct replacement for UC2879NG4 without PCB modification?

A: Yes. UC2879N is the manufacturer-recommended substitute with identical electrical specifications, package type (20-DIP), and pin configuration. No PCB layout changes are required.

Q: What are the key differences between UC2879N and UCC28951PWR?

A: UC2879N maintains identical specifications to UC2879NG4 with 300kHz switching frequency and 50% duty cycle. UCC28951PWR operates at higher switching frequencies (up to 1MHz) with extended duty cycle capability (95% maximum) and wider operating temperature range (-40°C to 125°C). UCC28951PWR uses 24-TSSOP surface mount packaging versus 20-DIP through hole, requiring PCB redesign.

Q: Is UCC28951PWR compatible with UC2879NG4 designs without circuit modification?

A: UCC28951PWR requires PCB redesign due to different package type and pin configuration. Circuit topology and control signal implementation may require evaluation based on specific application requirements.

Q: What is the supply voltage compatibility between these parts?

A: UC2879NG4 and UC2879N operate within 9.25V to 20V supply range. UCC28951PWR operates within 8V to 17V range. Designs operating above 17V supply voltage are not compatible with UCC28951PWR.

Q: Are all substitute parts RoHS compliant?

A: Yes. UC2879NG4, UC2879N, and UCC28951PWR are all ROHS3 compliant with equivalent regulatory status (REACH Unaffected, ECCN EAR99).

Q: What is the availability status of these parts?

A: UC2879NG4 is discontinued at DiGi Electronics. UC2879N is Last Time Buy status with limited future availability. UCC28951PWR is Active status with ongoing supply availability.

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