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DC/DC converters for railway and other ruggedized applications must withstand greater disruptive forces then most stationery applications and are subject to greater demands for operational safety, durability and thermal shock. There are 3 important standards to consider for these applications.

  • EN 50155 is the governing standard for Electronic Equipment used in Rolling Stock.
  • EN 50121 is a referenced standard that specifies limits for electromagnetic emissions and immunity for railways and equipment used within those railways. The sub category EN 50121-3-2 specifically defines the requirements for conducted emissions and immunity for rolling stock. This standard typically applies to the finished assembly after installation.
  • EN 61373 is a referenced standard that defines the random shock and vibration stresses that must be withstood while providing continuous operation.
EN 50155 is the harmonized successor of older standards used in France and the UK. They include NFF01-510 and BRB/RIA respectively. EN 50155 is now the de-facto symbol of quality, indicating robustness, reliability and durability in the railway and transportation sectors with extreme environments. When choosing a DC/DC converter for these applications, you may consider these important requirements of EN 50155.

Minimum Input Requirements

Bus Voltage (VDC) Continuous Input Voltage (VDC) Brownout 100mS (VDC) Transient 1s (VDC) Railway DC/DC Input Range (VDC)
24 16.8-30.0 14.4 33.6 9-36
37.5 26.2-47.0 22.5 52.5 18-75
48 33.6-60.0 28.8 67.2 18-75
72 50.4-90.0 43.2 100.8 43-160
96 67.2-120.0 57.6 134.4 43-160
110 77.0-137.5 66 154 43-160


Ambient Temperature Requirements

Class Internal Cubicle
Temperature ( C )

Internal Cubicle Temperature
Over Temperature
During 10 Mins ( C )

Air Temperature Surrounding
the Printed Circuit Board Assembly( C )

T1 -25 to +55 15 -0.35714
T2 -40 to +55 15 -0.57143
T3 -25 to +70 15 -0.29412
TX -40 to +70 15 -0.47059


EN 50155 Sets These Additional Requirements:

  • Galvanic Isolation to protect electronic circuits
  • Relative Humidity levels up to 95% relative for 30 consecutive days
  • Continuous operation under stresses shown below per EN 61373


Mechanical Requirements

Parameter EN 50155
Vibration Frequency Range Acceleration Category< 0.3Kg5 - 150Hz 5g (5 Hrs per axis)
Shock (Half Sine) Peak Acceleration Duration Long./Trans./Vert. axis 5g/2g/1g 50mS/20mS/20mS


TMR 6WIR Series
6 Watt DC/DC Converter
0.86 x 0.44 x 0.38" PCB Mount Package
SAMPLES AVAILABLE Q2 / PRODUCTION Q3 2017
  • Ultra-Wide 9 ~ 36 / 18 ~ 75 / 43 ~ 160VDC Input Ranges
  • Outputs: 3.3, 5.0, 9.0, 12, 15, 24, ±12, ±15VDC 
  • Input filter to meet EN 55022 class B
  • Meet EN50155 Class S2 (10mS interruptions)
  • High Efficiency Operation
  • DC OK LED Indicator
  • -40°C to +85°C Full Load Operating Temperature
  • Optional DIN-Rail Mount Clip
  • 3 year product warranty
267
THN 15WIR Series
15 Watt DC/DC Converter
1.00 x 1.00 x 0.48" PCB Mount Package
SAMPLES AVAILABLE / PRODUCTION Q1 2017
  • Ultra-Wide 9 ~ 36 / 18 ~ 75 / 43 ~ 160VDC Input Ranges
  • Outputs: 3.3, 5.0, 9.0, 12, 15, 24, ±5, ±12, ±15, ±24VDC 
  • Remote On/Off & V trim Functions
  • High Efficiency up to 91%
  • Input under voltage lockout circuit
  • Input filter to meet EN 55022
    class A
  • Six-Sided Shielded Case
  • High Efficiency Operation
  • Operating Temperature -40 to +90°C (Derate 4%/K >77°C)
  • 3 year product warranty
TEQ 20WIR Series
20 Watt DC/DC Converter
4.36 x 2.25 x 1.03" PCB Mount Package
SAMPLES AVAILABLE / PRODUCTION Q1 2017
  • Ultra-Wide 9 ~ 36 / 18 ~ 75 / 43 ~ 160VDC Input Ranges
  • Outputs: 3.3, 5.0, 9.0, 12, 15, 24, ±12, ±15VDC 
  • Input filter to meet EN 55022 class B
  • Meet EN50155 Class S2 (10 mS interruptions)
  • Input under voltage lockout circuit
  • DC OK LED Indicator
  • High Efficiency Operation
  • -40°C to +85°C Full Load Operating Temperature
  • 3 year product warranty
TEQ 40WIR Series
40 Watt DC/DC Converter
4.36 x 2.25 x 1.03" PCB Mount Package
SAMPLES AVAILABLE / PRODUCTION Q1 2017
  • Ultra-Wide 9 ~ 36 / 18 ~ 75 / 43 ~ 160VDC Input Ranges
  • Outputs: 3.3, 5.0, 9.0, 12, 15, 24, ±12, ±15VDC 
  • Input filter to meet EN 55022
    class B
  • Meet EN50155 Class S2 (10 mS interruptions)
  • DC OK LED Indicator
  • High Efficiency Operation
  • -40°C to +85°C Full Load Operating Temperature
  • Optional DIN-Rail Mount Clip
  • 3 year product warranty