UCC3839D Equivalent & Substitute Parts

Part Overview

The UCC3839D is a secondary-side controller IC manufactured by Texas Instruments, designed for power supply applications. It operates with a supply voltage range of 7.5V to 15V and delivers 1.3 mA supply current. The device is packaged in a 14-SOIC surface-mount package with a width of 3.90mm.

The UCC3839D is classified as an obsolete product. Finding equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this controller.

Substiute Parts

UCC3839D

Texas InstrumentsIn Stock: 2413UCC3839D Datasheet

Current PartRFQ

AP3108LGSTR-G1

Diodes IncorporatedIn Stock: 30392AP3108LGSTR-G1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCC3839D is determined by functional equivalence as a secondary-side controller for power supply applications. The primary substitution criteria are:

• Functional classification: Secondary-side controller for power management
• Supply voltage compatibility: The substitute must operate within or encompass the original supply voltage range
• Current consumption: Supply current must be compatible with system design constraints
• Operating temperature range: Must support the thermal environment of the application
• Surface-mount packaging: Mechanical compatibility with PCB layout and assembly processes
• Compliance certifications: RoHS3 compliance and REACH status alignment

The AP3108LGSTR-G1 from Diodes Incorporated qualifies as a substitute based on these criteria, despite differences in package type and pin count, as it maintains functional equivalence as a secondary-side controller with compatible electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The AP3108LGSTR-G1 is the designated substitute for the UCC3839D. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The AP3108LGSTR-G1 is currently in active production status, providing supply chain continuity for the obsolete UCC3839D.

The substitute operates across a wider supply voltage range (10V ~ 28V) compared to the original part (7.5V ~ 15V), and supports an extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). Supply current consumption increases marginally from 1.3 mA to 1.7 mA. The package transition from 14-SOIC to 9-SSOP requires PCB layout modification and pinout verification during design integration.

Frequently Asked Questions (FAQ)

Q: Why is the UCC3839D being replaced? A: The UCC3839D is classified as an obsolete product. The AP3108LGSTR-G1 is an active substitute that maintains secondary-side controller functionality while ensuring ongoing component availability.

Q: Are the supply voltage ranges compatible? A: The AP3108LGSTR-G1 operates at 10V ~ 28V, which encompasses the upper portion of the UCC3839D range (7.5V ~ 15V). System designs operating within 10V ~ 15V are directly compatible. Designs requiring operation below 10V require evaluation against the substitute's minimum voltage specification.

Q: What is the impact of the package change from 14-SOIC to 9-SSOP? A: The package transition requires PCB layout redesign, including trace routing and component placement modifications. The 9-SSOP package has fewer pins and different mechanical dimensions than the 14-SOIC package. Pinout mapping must be verified against both datasheets before implementation.

Q: Is the increased supply current (1.7 mA vs 1.3 mA) significant? A: The increase of 0.4 mA is marginal and typically does not impact system-level power budgets. However, designs with strict power consumption constraints should evaluate this difference against application requirements.

Q: Are both parts compliant with environmental regulations? A: Yes. Both the UCC3839D and AP3108LGSTR-G1 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Can the AP3108LGSTR-G1 operate at temperatures below 0°C? A: The AP3108LGSTR-G1 supports operation from -40°C, extending the lower temperature limit compared to the UCC3839D (0°C minimum). This provides additional thermal margin for applications requiring extended temperature ranges.