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WaveTherm Corporation

VPX KNOWLEDGE BASE
VPX is a specification defining a rugged conduction-cooled system architecture for COTS military and industrial applications.

Extreme environments where VPX products are deployed require rugged modules and a hardened enclosure. The VITA 48.2 Specification defines a rugged, conduction-cooled system architecture for COTS military and industrial applications.

Under the VITA 48.2 / VPX Specification, the Conduction-cooled heatframe assembly (CCA) on the modules provide a thermal path from high energy components on the circuit board to the outer metal frame of the module. SolidWedge wedgelocks mounted on the heatframe serve to secure the module into the chassis cold-wall in order to withstand the necessary shock and vibration conditions. Force provided by the wedgelocks ensure firm contact between the module edges and the chassis slots in order to transfer thermal energy from the module to the enclosure in this conduction-cooled configuration.
Overview Vibration Class V1
  • Basic air-cooled characteristics
  • Basic conduction-cooling characteristics
  • Wedgelocks
  • Shock and vibration hardened
  • Extended temperature
  • Level 2 Maintenance
 1 hour per axis:
5 Hz to 100 Hz PSD = 0.04 g2/Hz
Vibration Class V2
1 hour per axis:
5 Hz to 100 Hz PSD increasing at 3 dB/octave
100 Hz to 1000 Hz PSD 0.04 g2/Hz
1000 Hz to 2000 Hz PSD decreasing at 6 dB/octave
3U Module Dimensions Vibration Class V3
3.94" x 6.30" 4HP or 5HP 1 hour per axis:
5 Hz to 100 Hz PSD increasing at 3 dB/octave
100 Hz to 1000 Hz PSD 0.1 g2/Hz
1000 Hz to 2000 Hz PSD decreasing at 6 dB/octave
Applications Served - Module Operating Temperature
  • Military Applications: Air, Land, and Sea
  • Mobile commercial or Transport Industry
  • Machine Industrial control
  • Outdoor Telecom = Edge and Customer Premise Equipment
  • Medical
  • Enterprise and Data
  • Digital Imaging
 Conduction-Cooled
Class Min/Max
CC1: 0°C / 55°C
CC2: -40°C / 55°C
CC3: -40°C / 70°C
CC4: -40°C / 85°C
Conduction-Cooled Liquid-Cooled
Class Min/Max
CC1: 0°C / 55°C
CC2: -40°C / 55°C
CC3: -40°C / 70°C
CC4: -40°C / 85°C 		Inlet Outlet
Class Min/Max
LC1: 0°C / 50°C
LC2: -40°C / 55°C
LC3: -40°C / 60°C
LC4: -40°C / 70°C
MICROTCA KNOWLEDGE BASE
Hybrid-Cooled MicroTCA.2 MicroTCA.2
Overview Module operating temperature:
  • Basic air-cooled characteristics
  • Basic conduction-cooling characteristics
  • Hybrid SolidWedge or other air-flow through wedgelocks required
  • Shock and vibration hardened
  • Extended temperature
  • Level 2 Maintenance
 MicroTCA.2-MIL-FC1 -5°C - +55°C
MicroTCA.2-MIL-FC2 -40°C - +55°C
MicroTCA.2-MIL-FC3 -40°C - +70°C
MicroTCA.2-MIL-FC4 -40°C - +85°C
Hardened MicroTCA.3 MicroTCA.3
Overview Module operating temperature:
  • Basic conduction characteristics
  • Wedgelocks required
  • Shock and vibration hardened
  • Extended temperature
  • Level 2 Maintenance
 MTCA.3-TEL-1 -5°C - +55°C
MTCA.3-TEL-2 -40°C - +85°C
MTCA.3-MIL-CC2 -40°C - +55°C
MTCA.3-MIL-CC3 -40°C - +70°C
MTCA.3-MIL-CC4 -40°C - +85°C
Specifications MicroTCA.2 & MicroTCA.3
Single-wide module dimensions: Shock:
  • Clamshell width: 98 +/- 0.13 mm
  • Length: 212.70 mm minimum, 225.00 maximum including front handles
 MIL-STD-810, Method 516:
40g, 11 millisecond shock either half-sine or sawtooth pulses in all three axes.
Double-wide module dimensions: Vibration:
  • Clamshell width: 173 +/- 0.13 mm
  • Length: 212.70 mm minimum, 225.00 maximum including front handles
 MIL-STD-810, Method 514:

Random vibration for 1 hour per axis: 5 Hz to 100 Hz Power Spectral Density increasingat 3 dB/octave 100 Hz to 1000 Hz PSD = 0.1 g2/Hz 1000 Hz to 2000 Hz PSD decreasing at 6 dB/octave

Test results prove no electrical discontinuity of the gold finger contacts during any of these tests.
Aplications Served - Environmentla Testing:
  • Military: Air, Land, and Sea
  • Mobile commercial or Transport Industry
  • Machine Industrial control
  • outdoor Telecom - Edge and Customer Premise Equipment
  • Medical
  • Enterprise and Data
  • Digital Imaging
 Using 50 microinch plated Goldfinger Contacts as specified In mTCA.2 and mTCA.3, a 10 day test using Mixed Flowing Gas (MFG) proved no plating degradation.