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UC3843D8 The Texas Instruments UC3843D8 is a current mode PWM controller designed for off-line and DC-to-DC converters. It operates at frequencies up to 500kHz.
Mfr Part #:

UC3843D8

Available from 2 distributors
Mfr Name: Texas Instruments
Texas Instruments
The Texas Instruments UC3843D8 is a current mode PWM controller designed for off-line and DC-to-DC converters. It operates at frequencies up to 500kHz.
✓ Total Stock: 2,375 pcs
$ Price Range: $0.68

UC3843D8 Available from 2 distributors

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Components Technology Group, Inc. ✓
Non-Authorised Inventory information
2,356 pcs
On Request
2356 pcs On Request 1 On Request On Request On Request On Request On Request
Bristol Electronics ✓
Non-Authorised Inventory information
19 pcs
On Request
19 pcs On Request 1 On Request On Request 2026-02-25 06:16:38 On Request On Request
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

UC3843D8 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Clock Sync
Control Features
Duty Cycle (Max)
Frequency
Function
Mounting Type
Number of Outputs
Operating Temperature
Output Configuration
Output Phases
Output Type
Supplier Device Package
Supplier Package
Synchronous Rectifier
Topology
Voltage
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UC3843D8 Description

Short technical summary and product information.

The UC3843D8 from Texas Instruments is a single-ended, current mode PWM controller optimized for off-line and DC-to-DC converters. It supports multiple topologies including Boost, Buck, Buck-Boost, Flyback, and Forward.

 

This controller features an adjustable switching frequency up to 500kHz and a maximum duty cycle of 97%. It operates within a voltage range of 12V to 28V and has an operating temperature range of 0°C to 70°C.

 

The UC3843D8 is housed in an 8-SOIC package, suitable for surface mount applications. Key control features include frequency control, current limiting, and an error amplifier. It is designed for efficient power management in various electronic systems.

 

This device offers features such as low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and undervoltage lockout with hysteresis, making it a versatile component for power supply designs.

UC3843D8 Quick Information

Product Type: DC DC Switching Controller
Canonical Name: UC3843D8 Current Mode PWM Controller
Subcategory: DC DC Switching Controllers

UC3843D8 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

UC3843D8 Estimated Pricing

Qty Low High
1+ $0.68 $0.68

Estimated market price range - modelled values for guidance only, not live distributor offers.

UC3843D8 Features

  • Current mode PWM controller for DC-to-DC.
  • Operates at frequencies up to 500kHz.
  • Supports multiple power topologies.
  • Surface mountable 8-SOIC package.
  • Wide voltage range of 12V to 28V.

UC3843D8 Applications

  • Used in off-line converters.
  • Suitable for DC-to-DC power supplies.
  • Ideal for Boost converter designs.
  • Applicable in Buck converter circuits.
  • Used in Flyback converter applications.

UC3843D8 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the input voltage range of UC3843D8?

The input voltage range is 12V to 28V.

What package does UC3843D8 come in?

The UC3843D8 is available in an 8-SOIC surface mount package.

What is the operating temperature range?

The operating temperature range is 0°C to 70°C.

What topologies does UC3843D8 support?

It supports boost, buck, buck-boost, flyback, and forward topologies.

What is the maximum switching frequency?

Up to 500kHz.

Does UC3843D8 have synchronous rectification?

No, it does not have synchronous rectification.

Does it support clock synchronization?

No, it does not support clock synchronization.

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