3843B SMD IC 5 Pcs Pack Original ST Brand – UC3843B PWM Controller | 3843 IC SMD

The 3843B SMD IC is a high-performance PWM controller IC commonly used in SMPS power supplies, battery chargers, adapters, inverter circuits, LED power supplies, and other switching power supply applications. This listing includes 5 pieces of original ST brand 3843B SMD IC, suitable for electronic repair, replacement, and circuit development.

Product Highlights

• Product Name: 3843B SMD IC
• Brand: STMicroelectronics (ST)
• Package: SMD
• IC Type: PWM Controller / Current-Mode PWM Controller
• Quantity: 5 Pieces
• Application: SMPS, power supply, inverter, battery charger, adapter and switching circuits
• Suitable For: Electronics repair and replacement
• Product Condition: Original component
• IC Family: UC3843 / UC3843B series
• Mounting Type: Surface Mount Technology (SMD)

3843B SMD IC Features

• High-performance current-mode PWM controller
• Designed for switching power supply applications
• Provides precise PWM control for power conversion circuits
• Suitable for offline and DC-to-DC converter applications
• Includes undervoltage lockout function
• Current-sense input for protection and regulation
• Suitable for high-frequency switching power supplies
• Compact SMD package saves PCB space
• Widely used in SMPS and power electronics circuits

3843 SMD IC Pinout

The UC3843/3843B PWM controller generally uses an 8-pin configuration:

• Pin 1 – COMP: Error amplifier compensation/output
• Pin 2 – VFB: Voltage feedback input
• Pin 3 – ISENSE: Current-sense input
• Pin 4 – RT/CT: Timing resistor and capacitor connection
• Pin 5 – GND: Ground
• Pin 6 – OUTPUT: PWM gate-drive output
• Pin 7 – VCC: Supply voltage input
• Pin 8 – REF: Reference voltage output

Important: Confirm the exact package, suffix, and manufacturer’s datasheet before PCB replacement, as package markings and specifications can vary between related UC384x devices.

3843 SMD IC Applications

• SMPS power supply circuits
• Switching power supplies
• Battery charger circuits
• Inverter power supply sections
• DC-DC converter circuits
• AC-DC adapter circuits
• LED driver power supplies
• Industrial power electronics
• Electronic repair and replacement
• High-frequency PWM control applications

Package Contents

• 3843B SMD PWM Controller IC – 5 Pieces
• Brand: Original ST
• Type: SMD PWM Controller

Why Choose 3843B PWM Controller IC?

The 3843B SMD PWM controller is a popular choice for current-mode switching power supply designs because it provides PWM control, feedback regulation, current sensing, and gate-drive output in a compact package. It is frequently found in SMPS and other power-conversion circuits.

3843B SMD IC, 3843 SMD IC, UC3843B IC, UC3843 PWM controller, 3843 PWM controller IC, 3843 IC pinout, UC3843 SMD IC, 3843B PWM IC, ST 3843B IC, SMD PWM controller, SMPS PWM controller IC, switching power supply IC, UC3843 IC 5 pcs, 3843 SMD IC original ST, 3843 IC for SMPS, PWM controller for inverter, 3843B IC online India.