Filter D-Sub Connector

Conec Filter dsub

L, C, LC and Pie Black filtered D Sub-miniature Connectors

Standard d-sub connectors can not guarantee protection from EMI/RFI, even when enclosed in shielded hoods. Filter d connectors and adaptors are an ideal solution to reduce or eliminate EMI. 

 

Overview

EMI is broadly defined as any unwanted electrical or electromagnetic energy that causes undesirable responses, degraded performance or failure in electronic equipment. Radio Frequency Interference (RFI) is a slightly more specific term often used interchangeably to describe the phenomenon. A filtered connector is widely recognized as the most effective point to filter noise either entering or exiting an EMI enclosure. Noise induced on a signal line within the box can be stripped off as it passes through the shielding enclosure, preventing radiation to adjacent equipment. Filtered connectors are also used to provide system immunity from external noise sources. Filters integrated into electronic connectors to achieve a reduction in conducted EMI have evolved over the years using a variety of elements and materials to achieve varying degrees of noise suppression. These filters are broadly identified as low-pass filters. A low-pass filter allows lower frequencies to pass through the filter with minimal reduction in signal strength, while attenuating signals with higher frequency.

A filter element achieves this by essentially becoming a variable resistor connected between the signal lines and ground. The resistive value is inversely proportional to the frequency of the signal it is conducting. As the frequency increases, the resistance of the filter decreases, providing a lower impedance path to ground. The capacitors strip off the interfering noise from the signal as it passes through the filter device whilst diodes are used to clamp the voltage below a certain value, thereby protecting the electronic circuitry.

Filters can selectively attenuate specific frequency bands by introducing controlled impedance mismatches into the line. A low-pass filter effectively strips higher frequencies to ground while allowing desirable lower frequencies to pass through the filter. Filtered connectors are typically bi-directional, in that they can attenuate noise originating from either side of the filter, an important advantage when considering immunity.

Many different configurations of filters have been developed to address a variety of circuit requirements. The simplest design is the C or feed-through filter which consists of a single capacitor inserted between the signal line and ground. As the conducted signal frequency increases, the effective resistance of the capacitor decreases, and therefore shunting higher frequencies to ground. The result is a filter that passes lower frequencies while attenuating higher frequencies.

CONEC provides the so-called C-filter as standard. In this single-stage low-pass filter, each contact of the connector is connected with a capacitor to the connector housing (ground). Other options that can be used depending on the problem to be solved are the two-stage LC and the three-stage PI filters (C-L-C), which are also available in various connector configurations in the standard product range.

With a large differential between operating and interference frequencies, a single C-filter is often a sufficient solution for the EMI problem. If the differential is small, multistage filter configurations can be used. A C-filter suppresses the interferences from the "3dB point" by approx. 20 dB, an LC filter with approx. 40 dB and a PI filter with approximately 60 dB per decade.

...  more

Key Features

Features

  • L Filters- The L filter consists of one Capacitive element and one inductive element. This type of filter may be used with either a low impedance source and a high impedance load or a high impedance load. "L" ferrite filter connectors are ideal for applications where a small amount of filtering is required or the elimination of parasitic frequencies. "L" filter connectors are very cost effective."L" filter connectors are available in the standard D-subminiature format from 9 to 37 positions and in the high density format from 15 to 62 positions.
  • C Filters- "C" filter connectors are made with patented planar filter technology. Planar Arrays are extremely effective at filtering high-frequency interference. The C Filter is a low inductance, feed through capacitor. It is used to attenuate high frequency signals. For special filter requirements such as selective filters, other types of filters can be implemented. "C" filter connectors are available in the standard D-subminiature format of from 9 to 50 positions, and in high density format from 15 to 78 positions.
  • LC Filters- for certain applications it may be necessary to use ferrites and capacitance to achieve the filtering requirements. "LC" filter series of connectors increases the insertion loss by approx. 5 dB depending on the frequency range. The ferrite block is attached externally to the connector contacts.  The attachment of the ferrite block does not change the physical size of the connector.  
  • Pie Black Filters- using planar technology these connectors offer an insertion loss of 45dB at 100 MHz and as high as 90dB at higher frequencies. PI filter connectors can be implemented where high performance in high frequency applications is required. PI filter connectors utilise two patented planar filters and one inductive element. The PI filters provide low impedance at the source and the load. PI filter connectors provide better performance if compared to C or L type filters. PI filters are available in adapter, right angle, PC and solder cup configurations.  
  • Footprints, board fixings and accessories as per standard or High Density D connectors.
  • Versions available with Dielectric Withstand Voltage of up to 1500 Vdc.
  • Filtered mixed layout styles available
  • Popular versions such as 2W2C, 3W3, 3W3C and 5W5 are available with totally integrated capacitance filters.
  • The filter capacitance ranges from 1.3nF to 100nF on each contact position.
  • Contacts with current ratings from 10A to 40A are available with solder bucket, straight PC, 90º PC or Press Fit tails.    
  • MIL-DTL-24308 D-Subminiature filter connectors are designed to meet or exceed all applicable requirements of the military specification. The filter connectors are intermateable and interchangeable with standard non-filtered connectors from all quality connector manufacturers.

Specifications

Materials

Blue Bullet

Shell - Steel
Tin plated (Plugs EMI/RFI dimpled)
Blue Bullet Insulator - Polyester GF, UL 94V-0
Blue Bullet Contacts - Machined or S/Formed copper alloy, plated hard acid gold over nickel solder area tin plated
Class 3 = 50 cycles
Class 2 = 200 cycles
Class 1 = 500 cycles
 
Electrical
Blue Bullet Capacitor values

Standard

HDD

180pF +/-20%

180pF +/-20%

370pF +/-20%

370pF +/-20%

830pF +/-20%

830pF +/-20%

1300pF +/-20%

-

Blue Bullet Current
Standard 5A @ 20ºC.
HDD 3A @ 20ºC.
Blue Bullet Working Voltage
 

Standard

HDD

Standard

100Vdc

100Vdc

High

100Vdc

-

Ultra High

200Vdc

-

Blue Bullet Dielectric Withstand Voltage
 

Standard

HDD

Standard

424Vdc

300Vdc

Standard (Pie Black)

300Vdc

-

High

707Vdc

-

Ultra High

1500Vdc

-

Ultra High (Pie Black & >1300pF)

1000Vdc

-

Blue Bullet Voltage surge

10/700µs

Standard

HDD

Standard

300V

-

High

500V

-

Blue Bullet Contact Resistance
Before use - max 10m Ohm Sign
After use - Triangle R max 10m Ohm Sign
Insulation Resistance - > 1 G Ohm Sign @ 100Vdc
Mechanical
Blue Bullet Mating/unmating forces

No. of Contacts

Standard

HDD

9

15

<30N

<50N

15

26

<50N

<83N

25

44

<83N

<110N

37

62

<123N

<170N

50

78

<167N

-

Blue Bullet Mechanical operations -
50 cycles
200 cycles
500 cycles
 
Environmental
Blue Bullet Working temperature:
Standard D -25º to +105ºC
HDD -25 to +85ºC
Blue Bullet Humidity - 40ºC/85% relative humidity
 
Types
Blue Bullet
180pF, 370pF, 830pF, 1300pF
Adaptor, C-LC-Pie Black-Filter
Plug and socket solder bucket L-Pie Black-Filter
Plug and socket straight PC C-Pie Black-Filter
Plug and socket 90º PC (0.318") C-LC-Filter
Plug and socket 90º PC (0.350") C-L-LC-Filter
Plug and socket 90º PC (0.370") C-L-LC-Filter
Plug and socket 90º PC (0.370") C-L-LC-Filter
Plug and socket 90º PC (0.590") C-Pie Black-Filter
Dual port C Filter 90º PC (0.625")
Dual port C Filter 90º PC (0.750")
Filtered (mixed layout) D connectors
Ferrites for standard and High Density D connectors
EMI/RFI gasket connector shield
Hoods and accessories

Applications

In applications where connectors penetrate shielded enclosures commonly represent a breakdown in shielding since the connector’s plastic isolating body provides no shielding against any interference signals that may be present. Therefore high frequency interference signals can be passed in or out of the system without hindrance. The connector’s contacts act as antennas that receive and transmit interference signals because filtering is typically implemented on the PC board. Interface connectors with integrated filters can be of benefit in these cases. CONEC filter D-subminiature connectors contribute to the protection of EMC zones. The intergrated filter inside the connector saves PCB-space and can be installed into an existing PCB layout. To replace an unfiltered connector into filtered one is simple and effective.

One of the standard filters offered by CONEC is the so-called “C filter”. Depending on the problem situations, other possible variations can be employed; a two-stage LC filter and a three stage PI filter (C-L-C) are also available in various connector configurations within the standard product line. CONEC filter connectors are an effective way to guard against electromagnetic interference (EMI RFI).

CONEC has developed a series of EMI-filtered connectors that provide near linear performance up to 1GHz and beyond. The EMI-filtered D-subminiature connector series features a proprietary ceramic planar that provides a higher linear performance with better insertion loss yet remains competitively priced with the 'chip cap' types. Traditional filter connectors that function from 100 to 300MHz, used with on-board filter capacitors, cannot provide the same level of insertion loss, conserved board space, or reduced components count as these new EMI-filtered connectors.

Filtered d type connectors are available as solder bucket and straight or right angled PCB, in standard, high density and dual-port configurations.

Filtered, mixed layout d connectors are ideal for power line filtering. Their small size means that they can be installed directly onto the backplane, backpanel, or power supply cable. These connectors and Adaptors are UL and CSA approved.

Because of the wide range of configurations available (including waterproof IP 67), these connectors are built to order.


Because of the wide range of configurations available (including waterproof IP 67), these connectors are built to order.

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D-Sub Connectors

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