NQB-D Series

420~468 W Intermediate Bus Quarter Brick Dc-Dc Converter with Digital Control

NQB-D Series

The NQB-D is a series of fully regulated 1/4 brick intermediate bus dc-dc converters with advanced digital control. The converters incorporate a 32-bit ARM-based microcontroller with power-optimizing firmware designed to maximize and flatten the efficiency curve, providing peak performance across a much wider range of loading conditions. In addition, the NQB-D series provides users with a range of configurable power management features via PMBus™, including output voltage, voltage margining, fault management, precision delay ramp-up, and start/stop.


  • Up to 468 W isolated output
  • Digital PMBus™ interface
  • Quarter brick package
  • 4.0~13.2 Vdc programmable output voltage
  • High efficiency, typ. 96.4% at half load, 12 Vout
  • Fully regulated
  • 2250 Vdc input to output isolation
  • Configurable soft start/stop
  • Precision delay and ramp-up
  • Voltage/current/temperature monitoring
  • Configurable fault response
  • Pin and function compatible with Architects of Modern Power® product standards


  • Baseplate for improved thermal performance
  • Through hole or surface mount pins
  • Droop load sharing up to 842 W


  • Package Type
  • Safety Approvals
  • Dimensions LxWxH (in)
    2.3 x 1.45 x 0.445
  • Dimensions LxWxH (mm)
    58.4 x 36.8 x 11.3


Model Number Input Voltage (Vdc) Power (W) Output Voltage (Vdc) Output Current (A) Stock Check Sample Request RFQ
NQB-420DW 36 ~ 75 420 12 35 Stock Check NQB-420DW Sample Request Request a Quote
NQB-468DM 40 ~ 60 468 12 39 Stock Check NQB-468DM Sample Request Request a Quote