SEALED COTS ATR - In 5, 7 & 12 slot versions. For applications up to 1200 watts. Configure Now

6U - SEVENHEX-CHP - Extreme Cooling Capability

COTS - Customer configurable & loaded with options: Heat Exchanger bottom, top & side covers + 32 | 36 or 46 Integrated Heat Pipes. Configure Now

6U - SEVENHEX-CHP - Extreme Cooling Capability

Custom VPX Backplane - Tailored High Speed VPX backplanes and I/O integration to suit our customer requirements. Configure Now

6U SEVENHEX-CHP Description

Sealed, 1" pitch, high performance dry-air 6U chassis incorporates seven heat exchangers, 32, 36 or 46 super conductive heat pipes & air re-circulation fans inside. This minimum maintenance ATR is ideal for applications where ambient air is laden with hostile or harmful contaminants.


Heat is conducted to hollow sidewalls, top cover, bottom cover & rear panel heat exchangers where it is dissipated to the ambient environment by forced air rear fans or by vehicle air plenum. Two additional internal card-cage heat exchangers recirculate air & 32-46 integrated heat pipes provide fast passage for heat to exit the internal card-cage. Internal air recirculation fans ensure constant airflow across modules.


The 6U SEVENHEX-CHP chassis is available in 5, 7 & 12 slot versions, supporting Gen 3/4/5 VPX backplanes. Total PSU power of up to 1200 watts may be installed. Custom modifications can be designed upon request.


Internal layout is divided into 4 independent metallic partitions. I/O section at the front, card-cage, PSU section & exhaust fans at the rear. This improves EMI/EMC performance & reduces PSU noise on system electronics.

This 1" pitch chassis has been designed exclusively for VPX wedgelock IEEE P1101.2, VPX VITA 46.0/.1/.10/.3/.4/.7 conduction cooled modules.

6U SEVENHEX-CHP Performance



Slots / Pitch:5 | 7 | 12   1"

Sealed (Dry Air):

≤ 1200W

The 6U SEVENHEX-CHP chassis is suitable for high wattage sealed applications that demand superior cooling capability.

Chassis Global Thermal Resistance (CGTR) coefficient:
ΔT/W = 0.04°C (5 Slot) | ΔT/W = 0.03°C (7 Slot) | 0.025°C (12 Slot).

Chassis Payload Thermal Resistance (CPTR) coefficient:
ΔT/W = 0.05°C (5 Slot) | ΔT/W = 0.035°C (7 Slot) | 0.029°C (12 Slot).
For reliable operation it is recommended the maximum Payload Power not be exceeded. Subject to operating conditions.

All CM 6U ATR chassis are delivered tested, qualified and certified per Military Standards MIL-STD-461E & MIL-STD-810F.

6U SEVENHEX-CHP Backplanes

CM 6U SEVENHEX-CHP military backplanes are 100G Gen 4 rated, available in VPX 1" pitch format with 0.8" pitch module compatibility. This latest generation of high performance backplane is fitted with VITA 46.30 MultiGig RT3 Tyco connectors for high speed 'board-to-bus' transmission.


SEVENHEX-CHP backplanes are fitted with Dual Temperature Supervisory Units for independent temperature control of system devices (heaters, fans, etc.). The backplane drives two front panel LED indicator sets (16 LEDs in total), providing all system status information and four user definable LEDs for customer applications.

The SEVENHEX-CHP has been developed in compliance with VITA 46.3, VITA 65, VITA 66.5 and VITA 67 standards. High Speed Tachyon 100G PCB substrate material or Megtron 7 ensures the backplane delivers truly exceptional performance.

SEVENHEX-CHP backplanes have been specifically developed in alignment with the SOSA™ technical standard, delivering high current in +12VDC and +3.3VDC. The SEVENHEX-CHP backplane mates with a single or twin PSU modules that supply 600 watts each (+12VDC @ 42A and +3.3VDC @ 23A) to support even the most demanding VPX modules.


A SEVENHEX-CHP backplanes are customized to each customers requirements. Backplanes are developed using Allegro high speed design tools with critical emphasis on trace length and impedance matching of all differential and single tracks.

CM undertake complete backplane customization according to customer VPX topology and I/O requirements, delivering a fully 'turn-key' solution.

Backplane wiring integration is facilitated by a 60mm bottom cavity clearance and a 63mm clearance behind the enclosure front panel for connector I/O.

The SEVENHEX-CHP backplane is fitted with Class 1 military power input connectors that offer reliable shock & vibration interconnectivity between the backplane and PSU module(s). They allow for high DC current rates with low voltage drops & minimum contact heating.

CM ATR SEVENHEX-CHP - VPX Gen5 backplanes

The SEVENHEX-CHP 6U backplane is supplied with a military conformal coating. The VPX backplane is partially coated per MIL-I-4658C in areas in which do no affect VPX connectors. Read More

6U SEVENHEX-CHP Power Supplies

6U SEVENHEX-CHP (1'' Pitch) chassis PSUs support a wide variety of AC/DC input voltages (MIL-STD-704 & MIL-STD-1275) and a defined DC power output of 600 or 1200 watts. This line of 600 watt PSU modules have been exclusively developed in alignment with the SOSA™ Technical Standard.


All PSU models are fitted with Power Fail Monitor, remote voltage sensing, output voltage trim-up, time-delayed protection fuses, rear fan fuse and DC/DC converter remote shutdown.

To comply with MIL-STD-461E, a high capacity integrated EMI/EMC input voltage filter is fitted as standard on all 6U models.

Front-end FIAM modules are protected against DC reverse polarity. An optional reverse polarity diode may be fitted in series with power connector input pin IN (+).

Single-phase AC PSUs are fitted with a VICOR military Filter and Autoranging Rectifier Module (FARM) to provided EMI filtering, autoranging line rectification and inrush current limiting to meet MIL-STD-461E category A1b specifications for Electromagnetic Compatibility.


DC PSUs are equipped with a VICOR military Filter and Attenuator Module (FIAM). This front-end device is fitted prior to the DC/DC converters to provide EMI filtering, inrush current limiting and transient protection.

200VAC 3-Phase PSU versions additionally incorporate AC/DC rectifier stage prior to the VICOR FIAM front-end modules.

6U SEVENHEX-CHP (1'' Pitch) model PSUs incorporate isolated DC/DC converters and oversized hold-up capacitors to ensure proper operation during short power line failures. Outputs are protected against short-circuit, thermal-shutdown etc. PSUs are custom made to match the enclosure mechanics.


The PSU in SEVENHEX 1" pitch models is attached to a heat exchanger panel that provides both conduction and convection cooling. Internal air recirculation dissipates heat generated by the PSU through its panel via thermal conduction to the chassis frame.

Forced air that is drawn through the heat exchangers, passing over the PSU panel external fins & exhausted, removing the majority of heat.


6U SEVENHEX-CHP Rear Fan Assembly
Rear Fan Options
6U SEVENHEX-CHP chassis are equipt with four Military PX3 fans as standard (-54°C to +125°C), providing up to 560CFM.
6U SEVENHEX-CHP Dual LED Indicator Set
Dual LED Front Panel Indicator Sets
16 front panel LED indicators for monitoring; power status, fan speed, input voltage, temp., etc. + 4 dedicated customer defined LEDs
Front Panel
Custom layout with client logo and silk-screening. Machined holes for customers selected set of connectors.
6U SEVENHEX-CHP Panel Covers
Top/Bottom Covers
Removable Heat Exchanger Top Cover fitted with integrated heat pipes for high performance active cooling.
6U SEVENHEX-CHP Chassis Metalwork
Chassis Metalwork
Precision machined aeronautical aluminum with MIL-DTL-5541F chromate coating. All panels & joints incorporate EMI gaskets.
6U SEVENHEX-CHP Mounting Tray
Mounting Tray
Low profile with quick release system offers easy insertion/removal capability, weight optimized with minimized dimensions.
EMI/EMC Filter
High capacity integrated EMI/EMC input voltage filter is fitted as standard on all 6U models to comply with MIL-STD-461E.
6U SEVENHEX-CHP Internal Air Recirculation
Air Recirculation
Incorporating a low profile internal fan pack (4 fans) to recirculate air, improving card-cage, PSU & module heat dissipation.
6U SEVENHEX-CHP Seven Heat Exchangers + Heat Pipes
Seven Heat Exchangers + 32/36/46HP
Fitted with 7 heat exchangers in top & bottom covers, PSU panel, both lower internal card-cage walls & in both sidewalls + 36-46 heat pipes.


  • Contaminant-free enclosure
  • VPX ready (1.0" Pitch)
  • Accepts Conduction 6U Modules
  • Flexible Bottom I/O wiring
  • In-line EMI/EMC MIL-STD-461F Filter
  • Up to 1200W* Total Payload Power (30ºC Delta-T)
  • Integrated Temperature Supervisory Unit (TSU)
  • 50°C less than conventional 6U ATRs
  • 7 Integrated Heat Exchangers
  • Integrated Rear fan guards
  • 32/36/46 integrated heat pipes (Ø 8mm)
  • Dramatically increases payload MTBF by 6x*
  • Maintenance free operation
  • Front panel user indicators
  • Stand alone low weight ATR
  • Internal card-cage airflow recirculation
  • Independent Fan & Power Supply input voltage
  • Military Operating Temperature (-40°C | +85°C)
  • Customizable to specific requirements
  • Low Profile Mounting Tray with quick release
  • Manufactured with US MIL components
* Subject to operating conditions

6U ATR SEVENHEX-CHP Specifications

WIDTH 214.2 mm 265 mm 392 mm
HEIGHT 303 mm 303 mm 303 mm
DEPTH 578 mm 578 mm 578 mm
WEIGHT 21 Kg 25 Kg 32 Kg
CGTR COEFF ΔT/W = 0.040°C ΔT/W = 0.030°C ΔT/W = 0.025°C
HEAT PIPES 32 Heat Pipes - ⌀ 8mm 36 Heat Pipes - ⌀ 8mm 46 Heat Pipes - ⌀ 8mm
SLOTS 5 712
PSU MAX POWER 600W (+12 @ 42A, +3.3 @ 23A) 1200W (+12 @ 84A, +3.3 @ 46A) 1200W (+12 @ 84A, +3.3 @ 46A)
PSU V-INPUT 28 VDC ±30%, 48 VDC ±30%, 72 VDC ±30%, 270 VDC ±30%, Autorange 90-132 VAC RMS & 180-264 VAC RMS 47-880 Hz, 3-Phase 200 VAC ±30% 47-880 Hz
STD BACKPLANE 6U 1” pitch (5, 7 & 12 slot) - MULTIGIG RT 3 - PCIe 16 Gbaud & 100 GBASE-KR4 (25.78125 Gbaud)
BACKPLANE EXTRAS DC rail voltage-in-range supervisor, 16 panel LEDs, dual TSU, +5VDC/-12VDC power converter sockets, cold-start heaters
BOARD FORMAT CCS: Conduction-cooled slots only or MCS: Slot-by-slot user configured card-cage allows intermixing conduction-cooled ANSI-VITA 48.2 & air-cooled ANSI-VITA 48.1 boards
EXT. REAR FAN 200/280 CFM (2 x PX3) 400/560 CFM (4 x PX3) 400/560 CFM (4 x PX3)
INTERNAL FAN 4 x 27.5 (110 CFM) 6 x 27.5 (165 CFM) 10 x 27.5 (275 CFM)
FRONT PANEL AREA 157 mm x 164 mm 157 mm x 215 mm 157 mm x 342 mm
I/O SUPPORTED VITA 46 | 65 | 66 | 67 - check with factory for high speed I/O readily available solutions
HDMI/DVI/DP | USB 2.0 & 3.0 | SATA | up to 100GbE | up to 100G Optical | RF | Serial | GPIO | SAS | PCIe | 1553 | etc
OPERATING TEMP -40 °C to +85 °C Operating Temperature, -55 °C to 100 °C Storage Temperature
MTBF 25° GB 82,000 Hours, 65° AIC 27,000 Hours25° GB 80,000 Hours, 65° AIC 26,000 Hours25° GB 63,000 Hours, 65° AIC 20,000 Hours
MIL-STD-461G/810G CE101, CE102, RE101, RE102, CS101, CS114, CS116, RS101, RS103, 501.4, 502.4, 507.4, 508.5, 509.4, 515.5, 516.5


These highly optimized 6U chassis incorporate all proprietary technologies, features and well established mechanical & electrical solutions developed during the past 27 years.

FAC:Flow-through airflow open enclosure.

S:Standard sealed contaminant-free enclosure.

SEF:Sealed with Extended Fins contaminant-free enclosure.

SEF-HP:Sealed with Extended Fins + 18/20 Heat Pipes contaminant-free enclosure.

HES:Sealed fitted with 4 integrated heat exchangers contaminant-free enclosure.

HES-1Sealed 1" pitch, fitted with 4 integrated heat exchangers contaminant-free enclosure.

SIXHEX:Sealed fitted with 6 integrated heat exchangers contaminant-free enclosure.

SIXHEX-1:Sealed 1" pitch, fitted with 6 integrated heat exchangers contaminant-free enclosure .

SIXHEX-16HP:Sealed fitted with 6 integrated heat exchangers & 16 heat pipes contaminant-free enclosure.

SIXHEX-20HP-1:Sealed 1" pitch, fitted with 6 integrated heat exchangers & 20 heat-pipes contaminant-free enclosure.

SEVENHEX-CHP-1:Sealed 1" pitch, fitted with 7 integrated heat exchangers & 32, 36 or 46 heat-pipes contaminant-free enclosure.

6U ATR MIL Certificates

6U SEVENHEX-CHP Ordering Information

Generic Part Number:
CM-ATR-1S5 /CT /I /FP /F /C
/S5 Enclosure Size
  • CM-ATR-25: ½ ATR Long Size - 5 Slots (1" Pitch).
  • CM-ATR-135: ¾ ATR Long Size - 7 Slots (1" Pitch).
  • CM-ATR-145: 1 ATR Long Size - 12 Slots (1" Pitch).
/CT Enclosure Cooling Technique
  • SEVENHEX-36CHP: Sealed (1" Pitch) enclosure with 7 Heat Exchangers in sidewalls, top cover, bottom cover, rear panel, internal card-cage & integrates 36 heat pipes (⌀8mm).
/B Backplane Type
  • VPX: Military VITA 46 VPX Gen-4 Backplane.
/I PSU Input Power Voltage
  • 28VDC: 28 VDC Input.
  • 48VDC: 48 VDC Input.
  • 72VDC: 72 VDC Input.
  • 270VDC: 270 VDC Input.
  • 90-264VAC: Autorange 90-264 VAC @ 47-880 Hz Input.
  • 200VAC-3Ph: 200 VAC 3 Phase @ 47-880 Hz Input.
/W Power Supply Unit
CM-ATR- 1 25 PSU
  • A-600W: All PSUs (+12 VDC @42A, +3.3 VDC @23A).
CM-ATR- 1 35 PSU
  • A-600W: All PSUs (+12 VDC @42A, +3.3 VDC @23A).
  • A-1200W: All PSUs (+12 VDC @84A, +3.3 VDC @46A).
  • A-600W: All PSUs (+12 VDC @42A, +3.3 VDC @23A).
  • A-1200W: All PSUs (+12 VDC @84A, +3.3 VDC @46A).
/S Temperature Supervisory Unit
  • Dual TSU fitted as standard.
/FP Front Panel Layout
  • CMP: Standard CM front panel fitted with MIL-C-38999 connectors.
  • UDP: User defined front panel layout (requires customer drawing).
/TC Chassis Top Cover + Wiring clearance
  • HETC: Heat Exchanger Top Cover.
/BC Chassis Bottom Cover + Wiring clearance
  • HEBC: Heat Exchanger Bottom Cover. ‡ 60mm.
/CS Chassis Card-Cage Slot
  • CCS: Conducton-cooled Card-cage slots (conduction-cooled boards only). (Fitted as standard).
/F Rear-mounted Fan Assembly
Fans Pack available for CM-ATR-125
  • F115-400: 2x Rotron PX3 Military fan fitted for 115VAC @ 400Hz (100CFM each).
  • F200-400: 2x Rotron PX3 Military fan fitted for 200VAC @ 400Hz 3-Phase (140CFM each).
Fans Pack available for CM-ATR-135 & CM-ATR-145
  • F115-400: 4x Rotron PX3 Military fan fitted for 115VAC @ 400Hz (100CFM each).
  • F200-400: 4x Rotron PX3 Military fan fitted for 200VAC @ 400Hz 3-Phase (140CFM each).
Vehicle air-plenum assembly
  • VAP: Vehicle Air-Plenum according to customer specifications (external forced air source).

/G Fan Finger Guards
  • EMIG: EMI shielding finger guards with honeycomb filter.
/C Chassis Color
  • B: Black, G: Navy Grey, E: Army Dark Earth, W: White, R: Red, PT: Platinum, YW: Yellow, GN: Green, BLU: Dark Blue, CR: Chromate MIL-C-5541 or O: Other (user defined).
Part Number Example: