UC3846Q Equivalent & Substitute Parts

Part Overview

The UC3846Q is a Power Management IC (PMIC) functioning as a multi-topology DC-DC controller, supporting Boost, Flyback, Forward Converter, Half-Bridge, and Push-Pull converter topologies. It provides transistor driver output with positive output configuration and dual output phases. The UC3846Q is classified as an obsolete product, making equivalent substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

UC3846Q

Texas InstrumentsIn Stock: 2011UC3846Q Datasheet

Current PartRFQ

UC3846DWTR

Texas InstrumentsIn Stock: 12298UC3846DWTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UC3846Q is determined by strict equivalence across the following critical parameters:

• Base product number (UC3846 series)
• Voltage supply range (6.95V ~ 40V)
• Switching frequency (500kHz)
• Maximum duty cycle (50%)
• Output type (Transistor Driver)
• Function (Step-Up, Step-Up/Step-Down)
• Output configuration (Positive)
• Number of outputs (2)
• Topology support (Boost, Flyback, Forward Converter, Half-Bridge, Push-Pull)
• Control features (Current Limit, Enable, Frequency Control, Soft Start)
• Operating temperature range (0°C ~ 70°C)
• Synchronous rectifier capability (Yes)
• Clock sync capability (Yes)
• Compliance certifications (ROHS3, REACH Unaffected)

The UC3846DWTR qualifies as a direct substitute based on identical electrical specifications and functional parameters. The primary difference is packaging format: the UC3846Q uses 20-PLCC (9x9) while the UC3846DWTR uses 16-SOIC, reflecting different manufacturing and application requirements.

Parameter Comparison

Engineering Selection Recommendations

The UC3846DWTR is the recommended substitute for the obsolete UC3846Q. Both parts maintain identical electrical specifications, functional capabilities, and compliance certifications (ROHS3 Compliant, REACH Unaffected). The UC3846DWTR carries Active product status, ensuring long-term availability and manufacturing support.

Selection between these parts is determined by PCB layout and packaging requirements. The UC3846Q uses 20-PLCC (9x9) packaging, while the UC3846DWTR uses 16-SOIC packaging. PCB footprint compatibility and board space constraints will dictate which package format is appropriate for your application. Both parts are surface-mount devices with identical electrical performance.

Frequently Asked Questions (FAQ)

Q: Can UC3846DWTR directly replace UC3846Q in existing designs?

A: Electrical substitution is complete. However, PCB layout modification is required due to different package formats. UC3846Q uses 20-PLCC (9x9) while UC3846DWTR uses 16-SOIC. Verify footprint compatibility with your PCB design before implementation.

Q: Are there any functional differences between UC3846Q and UC3846DWTR?

A: No. Both parts provide identical electrical specifications, switching frequency, duty cycle, output configuration, topology support, and control features. Differences are limited to packaging format and product status.

Q: Why is UC3846Q classified as obsolete?

A: Product status reflects Texas Instruments' manufacturing lifecycle decisions. The UC3846DWTR (Active status) provides equivalent functionality with ongoing manufacturing support.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is based on matching voltage supply range (6.95V ~ 40V), switching frequency (500kHz), duty cycle (50%), output type (Transistor Driver), topology support (Boost, Flyback, Forward Converter, Half-Bridge, Push-Pull), control features, and compliance certifications. Package format differences do not affect electrical substitution.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both UC3846Q and UC3846DWTR are ROHS3 Compliant and REACH Unaffected, meeting environmental and regulatory requirements.

Q: What is the moisture sensitivity level for these parts?

A: Both parts have MSL 2 (1 Year) rating, indicating standard moisture handling requirements for surface-mount components.