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Manufacturer Part #


UC3845B Series 275 KHz 25 V High Performance Current Mode Controller - SOIC-8

Mfr. Name: ON Semiconductor
Standard Pkg:
Product Variant Information section
Date Code: 1837
Product Specification Section
Technical Attributes
Attributes Table
Supply Current-Max: 0.5mA
Supply Voltage: 7.6V to 36V
Turn On Threshold Voltage: 8.5V
Turn Off Threshold Voltage: 7.6V
Duty Cycle-Max: 50%
Frequency-Max: 275kHz
Operating Temp Range: 0°C to 70°C
Package Style:  SOIC-8
Mounting Method: Surface Mount
Features and Applications

The UC3845BD1R2G is a high performance fixed frequency current mode controller, available in a SOIC-8 package.

It is specifically designed for Off−Line and DC−DC converter applications offering the designer a cost−effective solution with minimal external components.


  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation to 500 kHz Output Switching Frequency
  • Output Deadtime Adjustable from 50% to 70%
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle−By−Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • These Devices are Pb−Free and are RoHS Compliant
  • NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable
Pricing Section
Web Price:
$0.635 USD Each
Cost Per Unit
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Tariff charges may apply if shipping to the United States. An estimate of tariff charges will be calculated at checkout.

$7.00 reeling fee is amortized over the number of components for each reel.
Mini-Reels are a custom product and are non-cancelable and non-returnable.

Product Variant Information section