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UC3843B AI Analysis:
Datasheet, Specs, Alternatives & ECAD

AI summary

UC3843B product

UC3843B

AC DC Converters

PWM ControllerCurrent ModePower Management

The UC3843B is a fixed-frequency, current-mode PWM controller optimized for off-line and DC-to-DC power converter applications.

Best for

  • Flyback converters
  • Boost converters
  • Offline power supplies

Avoid if

  • Voltage-mode control is required
  • Applications requiring >1A gate drive current

Check before use

  • Ensure the 8.4V start-up threshold meets your system's power-up sequence requirements.

Key specifications

Start-Up Threshold
8.4 V
Max Duty Cycle
100%
Max Frequency
500 kHz

Compliance & Environment

RoHS
ROHS3 Compliant
REACH
-
MSL
1 (Unlimited)
ECCN
EAR99
HTSUS
8542.39.0001

Application

Power Management

Datasheet

3b94b9e8a36584bdef7a0f3eaf32ef1c_2311091740_UMW-Youtai-Semiconductor-Co---Ltd--UC3843B_C2995531.pdf

800 KB

Datasheet AI

CAD Models

Download ECAD models for UC3843B: KiCad symbol & footprint, Altium footprint, PCB footprint, and 3D model.

EDA Symbol
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PCB Footprint
Land pattern for PCB layout
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3D Model
STEP file for mechanical design
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KiCad Library
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Where to Buy

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Live prices updated on demand · Catalog (~) prices may differ

Alternative components

Alternatives are being enriched. Analyze this part in PartGenie for the latest matches.

Design and risk insights

Questions & answers

It is a high-performance PWM controller designed to drive power MOSFETs in current-mode control topologies.