New Industry Products

12:1 Input 40W/60W/100W Quarter-Bricks for Harsh Environments

June 30, 2019 by Scott McMahan

Powerbox launched three new series of extra-wide input voltage range, 40W to 100W board-mounted dc-dc converters for the railway, transportation, and defense sectors.

With an extra wide input voltage range of 14V to 160V and 9V to 75V, Powerbox developed the PQAE40U (40W), PQAE60U (60W) and PQAE100U (100W) to provide a single part number that can power a broad range of applications (such as railway, industrial automation and automotive, remote radio-control). This broad range of applications reduces inventory, time to market, and documentation.

Powerbox designed the PQAE40/60/100U series for harsh environments. The series meets thermal, vibration, and shock, requirements as specified in EN61373 and MIL-STD-810F, and also meet the fire and smoke EN45545-2 standard.

The PQAE40/60/100U series can be operated from -40°C up to +105°C case temperature, meeting the very demanding, ruggedized requirements such as those found in mining equipment, construction vehicles, and heavy machinery process control.

Railway and industrial power designers often face very daunting challenges of optimizing board power solutions when designing standardized equipment for worldwide operation on a very wide variety of system bus voltages.

In the railway industry, designers continuously seek the best power architecture to operate within the overall EN50155 input voltage range, from 24V up to 110V, including continuous operation in the 14.4V brownout condition and 154V transients.

To ensure the highest level of flexibility, Powerbox developed the PQAE40/60/100U series to deliver full and stable power within an extended input voltage range from 14V up to 160V. For lower bus voltages, the 9V to 75V versions cover the primary battery voltages, sustaining peak voltage and continuous operation up to 75V.

The PQAE40/60/100U series is available in seven output voltages of 5V, 12V, 15V, 24V, 28V, 48V, and 53V, and the units exhibit an efficiency of up to 90%. With the extra-wide 12:1 input range, this level of efficiency is outstanding.

All models within the PQAE40/60/100U series have full protection level sets including over-voltage, over-load, short-circuit protection, along with thermal shutdown. All units operate at a fixed switching frequency and include PI type input filters.

The operating temperature range is from -40°C to +105°C baseplate, and storage is from -55°C to +125°C.

Designed for ruggedized environments, the PQAE40/60/100U series meet thermal shock and vibration requirements as specified in EN61373 and MIL-STD-810F. All the products in the series comply with IEC/UL/EN-60950, EN62368-1 and the railway standards EN50155 and EN45545-2.

The PQAE40/60/100U series are available in an industry standard quarter-brick (36.8mm x 57.9mm x 12.7mm - 1.45in x 2.28in x 0.50in).

The units are all housed in a plastic case with an aluminum baseplate and are potted with a UL94-V0 silicon compound. Four optional heatsinks with different height and airflow orientations are available upon request.

The 9Vdc to 75Vdc modules feature input to output basic insulation of 2,250Vdc, and the 14Vdc to 160Vdc modules have reinforced insulation of 3,000Vac. PQAE40/60/100U series converters are RoHS compliant.


  • 40W/60W/100W market-leading power density, 12:1 input, quarter brick format.
  • Two input ranges covering from 9Vdc to 160Vdc
  • EN50155 input voltage range, from 24V up to 110V (including continuous operation in the 14.4V brownout condition and 154V transients)
  • +105°C maximum base plate temperature
  • Seven output voltages including 53V for PoE and 28V for defense applications
  • Meets thermal shock and vibration requirements of EN61373 and MIL-STD-810F