The Mini Delta Ribbon (MDR) is a half pitch interconnect system designed to meet the needs of high speed/density input/output applications.  With more than 20 years on the market, the MDR system is an established and well-proven solution for high density I/O.

MDR has widespread acceptance because it offers a combination of design features:

  • Shielded shells provide EMI/ESD protection.
  • Pre-loaded ribbon contacts provide proven reliable connection.
  • IDC U-shaped contacts allow mass termination.
  • Wide range of pin counts and form factors enable design flexibility

The current scope of MDR system components can easily be expanded to meet the specific requirements of a broad range of applications. The MDR connector system contains a ribbon-style contact based on 0.050″ centerlines. Both the receptacle and the mating plug contain pre-loaded contacts for reliable contact during insertion and withdrawal cycles. The cable connectors utilize an insulation stripping U-contact to connect to the cable conductor wires. The contact is stamped from a high performance copper alloy, which provides an excellent combination of mechanical strength, electrical conductivity and corrosion resistance.

MDR Cable AssemblyLow Voltage Differential Signaling (LVDS) technology meets the requirements for a general purpose, high bandwidth interface for serial and parallel data at speeds up to 655 Mbps. The LVDS Standard is based on the use of 100 Ohm differential impedance transmission medium from driver to receiver. Signal skew is the largest factor inhibiting speed within a system and can occur at all points along the transmission path: driver to receiver circuits, circuit board traces, cables and connectors. Both types of skew within pair skew and channel skew can prohibit optimum performance in high speed transmission systems. 3M MDR Connectors provide an excellent solution for the demanding requirements of LVDS applications.

MDR Cable Assembly 02These cables are used to interconnect equipment which utilizes 68-pin MDR (Mini Delta Ribbon) connectors. These cables feature 68-pin MDR Male connectors on each end, over molded ends with strain reliefs, twisted pair wiring, and a shielded cable jacket. Latches secure the cable to the mating connector. Two cable lengths (3 feet and 6 feet) are available.

The connector used on this product goes by several different names, including Mini D Ribbon, Mini Delta Ribbon, MDR, Mini Centronics, Half-Pitch Centronics, HPCN, HPCN68, Half-Pitch CN, and Micro Centronics. It is also occasionally referred to as a SCSI2 connector, though that is not typically a proper use of the term.

The Mini Delta Ribbon (MDR) series of connectors provides a compact arrangement of durable sliding ‘ribbon’ contacts. The high contact density and good performance at high speeds have resulted in many applications for this connector type. These are ‘half-pitch’ connectors that means the contact spacing is tighter than full-size Centronics connectors. ‘Half-pitch’ connectors utilize contacts on 0.05″ centers.

This cable utilizes twisted pair wiring. The pair mapping is as follows: 1/35, 2/36 … 33/67, 34/68.

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