DIN 5-Pin (180°) MIDI Hardware Pinout & Wiring
The standardized 5-pin 180-degree DIN connector specification defined in 1983 for 5mA current-loop MIDI communication.
# Mathematical Formula & Architecture
Logic SpecificationPin 1: Unused. Pin 2: Shield/Ground. Pin 3: Unused. Pin 4: Current Source (+5V via 220Ω). Pin 5: Current Sink (Data via 220Ω).
DIN-5 MIDI Pinout (Looking into Female Socket on Synth):
[3] [1]
[5] [4]
[2] (Shield)
Pin 4: +5V DC through 220 ohm resistor (Source)
Pin 5: MIDI Data inverted through 220 ohm resistor (Sink)
Pin 2: Cable Shield Ground (Connected AT TRANSMITTER ONLY to prevent loops!)# Deep Technical Analysis & Historical Context
The physical layer of MIDI 1.0 is engineered around a 5mA current-loop circuit rather than simple TTL voltage levels. Using a 180° 5-pin DIN connector (IEC 60130-9), only three pins are wired: Pin 4 (current source), Pin 5 (current sink/data), and Pin 2 (ground shield). Crucially, the MIDI specification dictates that Pin 2 (Shield) is connected to chassis ground ONLY at the MIDI OUT port, and left floating (unconnected) at the MIDI IN port. This creates complete galvanic isolation between connected instruments, preventing 60Hz/50Hz AC mains ground loops from entering sensitive analog audio paths.
Common Studio Pitfall & Hardware Hazard
Cheap 5-pin DIN cables with Pin 2 grounded at both ends or counterfeit USB-MIDI cables omitting current-loop resistors introduce audible 60Hz hum into analog audio monitor chains.
# Hardware Synthesizers Using This Technology
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# Frequently Asked Engineering Questions
Can I use an old 5-pin DIN audio cable for MIDI?
Old European 5-pin DIN audio cables often connect pins 1, 3, and 5 for stereo audio, leaving pin 4 disconnected. True MIDI cables must have pins 4 and 5 wired with twisted-pair conductors.
Related Engineering Concepts
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