MIL-COTS MicroRAM™
Output Ripple Attenuator Module

Description

The MicroRAM output ripple attenuation module combines both active and passive filtering to achieve greater than 40 dB of noise attenuation from 60 Hz to
1 MHz. The MicroRAM operates over a range of
3 – 30 VDC, is available in either 20 or 30 A models and is compatible with most manufacturers switching converters including Vicor's MI-200/MI-J00 and Maxi, Mini and Micro series DC-DC converters.

The MicroRAM's closed-loop architecture greatly improves load transient response and with dual mode control, insures precise point-of-load voltage regulation. The MicroRAM supports redundant and parallel operation with its integrated ORing diode function.

Specifications
Input Voltages   3 – 30 VDC
Output Power  

µRAM2(xxx): 20 A
µRAM3(xxx): 30 A

Efficiency   Up to 98%
Dimensions    2.28 x 1.45 x 0.50 in 
57.9 x 36.8 x 12.7 mm
   

 

 

PDF Icon Data Sheet »

 

Find

Compatible Converters

The MIL-COTS MicroRAM – Output Ripple Attenuator Module – works in conjunction with a specific set of Vicor converters to deliver optimal efficiency, power and protection.
 
To easily view the appropriate converter components needed for the desired MIL-COTS MicroRAM, please use the PowerBench Solution Selector tool to locate compatible offerings.

Features & Benefits
  • >40 dB ripple attenuation from 60 Hz to 1 MHz
  • Integrated ORing diode supports N+1 redundancy
  • Environmental stress screening
  • Combined active and passive filtering
  • 20 and 30 Ampere ratings
Diagram
microram-block-diagram.jpg

Vicor’s MicroRAM uses both active and passive filtering to attenuate PARD (Periodic and Random Deviations), typically associated with a DC to DC converter’s output voltage. The passive filter provides effective attenuation in the 50 KHz to 20 MHz range. The low frequency range of the passive filter (ie; resonant frequency) can be lowered by adding capacitance to the CTRAN pin to ground and will improve the transient load capability. The active filter provides attenuation from lower frequencies up to 2 MHz. The lower frequency range of the active filter can be extended down by adding an external by-pass cap across the RHR resistor.

 

Click image to enlarge. 

 

Packaging Options

2-D Micro-Size Module (referring to drawing number 25004)

DXFOutline drawing for Micro DC-DC Converter »

PDFOutline drawing for Micro DC-DC Converter »

 

3-D Micro-Size Module (referring to drawing number 25004)      

STEPMicro, short tin / lead pin, slotted baseplate »

3D PDFMicro, short tin / lead pin, slotted baseplate »

STEPMicro, short tin / lead pin, threaded baseplate »

3D PDFMicro, short tin / lead pin, threaded baseplate »

STEPMicro, short tin / lead pin, through-hole baseplate »

3D PDFMicro, short tin / lead pin, through-hole baseplate »

 

STEPMicro, long tin / lead pin, slotted baseplate »

3D PDFMicro, long tin / lead pin, slotted baseplate »

STEPMicro, long tin / lead pin, threaded baseplate »

3D PDFMicro, long tin / lead pin, threaded baseplate »

STEPMicro, long tin / lead pin, through-hole baseplate »

3D PDFMicro, long tin / lead pin, through-hole baseplate »

 

STEPMicro, short ModuMate, slotted baseplate »

3D PDFMicro, short ModuMate, slotted baseplate »

STEPMicro, short ModuMate, threaded baseplate »

3D PDFMicro, short ModuMate, threaded baseplate »

STEPMicro, short ModuMate, through-hole baseplate »

3D PDFMicro, short ModuMate, through-hole baseplate »

 

STEPMicro, long ModuMate, slotted baseplate »

3D PDFMicro, long ModuMate, slotted baseplate »

STEPMicro, long ModuMate, threaded baseplate »

3D PDFMicro, long ModuMate, threaded baseplate »

STEPMicro, long ModuMate, through-hole baseplate »

3D PDFMicro, long ModuMate, through-hole baseplate »

 

STEPMicro, short gold pin (RoHS), slotted baseplate »

3D PDFMicro, short gold pin (RoHS), slotted baseplate »

STEPMicro, short gold pin (RoHS), threaded baseplate »

3D PDFMicro, short gold pin (RoHS), threaded baseplate »

STEPMicro, short gold pin (RoHS), through-hole baseplate »

3D PDFMicro, short gold pin (RoHS), through-hole baseplate »

 

STEPMicro, long gold pin (RoHS), slotted baseplate »

3D PDFMicro, long gold pin (RoHS), slotted baseplate »

STEPMicro, long gold pin (RoHS), threaded baseplate »

3D PDFMicro, long gold pin (RoHS), threaded baseplate »

STEPMicro, long gold pin (RoHS), through-hole baseplate »

3D PDFMicro, long gold pin (RoHS), through-hole baseplate »

Related Products

   

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DC-DC Defense & Aerospace    

 

 

Converters    
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MIL-COTS Maxi, Mini, Micro DC-DC Converters   Go  

 

Filters    
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MIL-COTS MicroRAM Output Ripple Attenuation Module   Go  
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MI-RAM MIL-COTS Ripple Attenuator Module   Go  

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Accessories

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EMI Shielding

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Micro-size Shield   Part
Number
  Module
Style
           
 
   
 
   
 
  Technical Drawing    
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For Slotted Baseplate   30141   Micro                       PDF   Add to Cart  
                      DXF  
001x001px_005195.jpg
For Threaded or
Through hole Baseplate
  30143   Micro                       PDF   Add to Cart  
                      DXF  

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For InMate headers, all sockets are supplied to assure proper alignment during installation.
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JPGExample Inboard Mounting »
JPGExample Onboard Mounting »
 
InMate
Sockets
  Part
Number
  Mounting
Style
  Module
Style
  Pin
Style
  Board
Thickness

(Nominal)
  Board
Thickness

(Min/Max)
      Technical Drawing    
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Set
(5) Input, (5) Ouput
  18366   Inboard   Mini   Short RoHS (Gold)   0.063"   0.055" / 0.071"       PDF   Add to Cart  
                DXF  
001x001px_acc0c7.jpg
Input Only
(35) Pieces
  18374   Inboard   Mini   Short RoHS (Gold)   0.063"   0.055" / 0.071"           Add to Cart  
001x001px_acc0c7.jpg
Output Only
(35) Pieces
  18384   Inboard   Mini   Short RoHS (Gold)   0.063"   0.055" / 0.071"           Add to Cart  
001x001px_005195.jpg
Set
(5) Input, (5) Ouput
  18368   Onboard   Mini   Long RoHS (Gold)   0.063"   0.055" / 0.071"       PDF   Add to Cart  
                DXF  
001x001px_acc0c7.jpg
Input Only
(35) Pieces
  18378   Onboard   Mini   Long RoHS (Gold)   0.063"   0.055" / 0.071"           Add to Cart  
001x001px_acc0c7.jpg
Output Only
(35) Pieces
  18390   Onboard   Mini   Long RoHS (Gold)   0.063"   0.055" / 0.071"           Add to Cart  
001x001px_005195.jpg
Set
(5) Input, (5) Ouput
  18367   Inboard   Mini   Short RoHS (Gold)   0.094"   0.084" / 0.104"       PDF   Add to Cart  
                DXF  
001x001px_acc0c7.jpg
Input Only
(35) Pieces
  18375   Inboard   Mini   Short RoHS (Gold)   0.094"   0.084" / 0.104"           Add to Cart  
001x001px_acc0c7.jpg
Output Only
(35) Pieces
  18385   Inboard   Mini   Short RoHS (Gold)   0.094"   0.084" / 0.104"           Add to Cart  
001x001px_005195.jpg
Set
(5) Input, (5) Ouput
  18369   Onboard   Mini   Long RoHS (Gold)   0.094"   0.084" / 0.104"       PDF   Add to Cart  
                DXF  
001x001px_acc0c7.jpg
Input Only
(35) Pieces
  18379   Onboard   Mini   Long RoHS (Gold)   0.094"   0.084" / 0.104"           Add to Cart  
001x001px_acc0c7.jpg
Output Only
(35) Pieces
  18391   Onboard   Mini   Long RoHS (Gold)   0.094"   0.084" / 0.104"           Add to Cart  
001x001px_005195.jpg
Set
(5) Input, (5) Ouput
  21511   Onboard   Mini   Long RoHS (Gold)   0.125"   0.1125" / 0.1375"       PDF   Add to Cart  
                DXF  
001x001px_acc0c7.jpg
Input Only
(35) Pieces
  21539   Onboard   Mini   Long RoHS (Gold)   0.125"   0.1125" / 0.1375"           Add to Cart  
001x001px_acc0c7.jpg
Output Only
(35) Pieces
  21544   Onboard   Mini   Long RoHS (Gold)   0.125"   0.1125" / 0.1375"           Add to Cart  

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Socket Extraction Tool

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Module
Exchange Tool
  Part
Number
  Module
Style
                      Technical Drawing    
001x001px_005195.jpg
Used to facilitate the proper extraction of Micro modules from InMate or SurfMate sockets.   22829   Micro                         Add to Cart  

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Thermal Management

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Heat Sinks listed in the table below are for use with Vicor Micro-size modules.
These heat sinks are NOT for use with Vicor VI-200 or V1-J00-size modules.
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TOOLHeat Sink Thermal Data and Calculator »
 
Heat Sinks
Longitudinal Fins
  Part
Number
  Mounting
Style
  Module
Style
                  Technical Drawing    
001x001px_005195.jpg
0.40"   32174   Threaded   Micro   Not for use with threaded baseplates   PDF   Add to Cart  
          DXF  
001x001px_005195.jpg
0.90"   30190   Threaded   Micro   Not for use with threaded baseplates   PDF   Add to Cart  
          DXF  
001x001px_005195.jpg
0.40"   30719   Through hole   Micro                   PDF   Add to Cart  
                      DXF  
001x001px_005195.jpg
0.90"   30183   Through hole   Micro                   PDF   Add to Cart  
                      DXF  

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Back to Top 
 

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Heat Sinks listed in the table below are for use with Vicor Micro-size modules.
These heat sinks are NOT for use with Vicor VI-200 or V1-J00-size modules.
001x001px_alpha.png
TOOLHeat Sink Thermal Data and Calculator »
 
Heat Sinks
Transverse Fins
  Part
Number
  Mounting
Style
  Module
Style
                  Technical Drawing    
001x001px_005195.jpg
0.40"   32173   Threaded   Micro   Not for use with threaded baseplates   PDF   Add to Cart  
          DXF  
001x001px_005195.jpg
0.90"   30270   Threaded   Micro   Not for use with threaded baseplates   PDF   Add to Cart  
          DXF  
001x001px_005195.jpg
0.40"   30722   Through hole   Micro                   PDF   Add to Cart  
                      DXF  
001x001px_005195.jpg
0.90"   30725   Through hole   Micro                   PDF   Add to Cart  
                      DXF  

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Back to Top 
 

001x001px_alpha.png

Heat Sinks listed in the table below are for use with Vicor Micro-size modules.
These heat sinks are NOT for use with Vicor VI-200 or V1-J00-size modules.
001x001px_alpha.png
TOOLHeat Sink Thermal Data and Calculator »
 
Heat Sinks
Low-Profile
Side-Fin
  Part
Number
  Module
Style
  Height                   Technical Drawing    
001x001px_005195.jpg
0.55"   30095   Micro   0.125" above module baseplate       PDF   Add to Cart  
             

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Thermal Pads listed in the table below are for use with Vicor Micro-size modules.
These Thermal Pads are NOT for use with Vicor VI-200 or V1-J00 modules.
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ThermMate
Thermal Pads
  Part
Number
  Module
Style
                      Technical Drawing    
001x001px_005195.jpg
0.007"   20265   Micro                       PDF   Add to Cart  
                      DXF  

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