M56 - 16-Channel Analog Multiplexer (Product Discontinued)

The mezzanine card M56 is an M-Module which has 16 relay channels with throw-over contacts. It is a switching matrix for measuring signals with different voltage levels and different ground references.

The powerless-switching relays offer great advantages: since there are no thermoelectric potentials, the M56 can "process" very small voltage and current.

The M56 is based on the M-Module ANSI mezzanine standard. It can be used as an I/O extension in any type of bus system, i.e. CPCI, VME or on any type of stand-alone SBC. Appropriate M-Module carrier cards in 3U, 6U and other formats are available from MEN or other manufacturers.


  • 16 powerless-switching relays
  • 1 µA to 50 mA (max. 50 V), ±1.25 V, ±2.5 V
  • One throw-over contact each
  • No separate supply voltage
  • Low heat development
  • Optical isolation
  • -40 °C to +85 °C


Relay Outputs
  • 16 outputs as throw-over contacts
  • Switching voltages and currents
    • Switching voltage: max. 50V
    • Switching current: max. 100mA
    • Switching power: max. 5W
  • Cross-talk
    • Cross-talk damping between individual inputs: > 60dB
    • Cross-talk damping between input and output: > 60dB
    • Maximum frequency without cross-talk: 100MHz
  • Load current
    • Min. 1µA
    • Max. 50mA
  • Initial contact resistance: max. 50 mOhm
  • Relay position can be read back
  • Low heat development by use of CMOS components and bistable/monostable relays
Peripheral Connections
Via front panel on a shielded 50-pin D-Sub receptacle connector
M-Module Characteristics
A08, D08, IDENT
Electrical Specifications
  • Isolation voltage:
    • 500V DC between isolated side and digital side
    • Voltage between the connector shield and digital ground is limited to 180V using a varistor; AC coupling between connector shield and digital ground through 47nF capacitor
    • 150V DC between relay switching contacts
    • 250V DC between the channels
  • Supply voltage/power consumption: +5V (5V..5.5V), 150mA typ. with load, 125mA typ. w/o load
  • MTBF: 47,000h @ 50°C (derived from MIL-HDBK-217F)
  • Maximum switching quantity: 100,000,000 for any relay
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 75g
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C
    • Industrial temperature range on request
    • Airflow: min. 10m³/h
  • Temperature range (storage): -40..+85°C
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (storage): max. 95% non-condensing
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..150Hz
  • Conformal coating on request
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
Tested according to EN 55022 (radio disturbance), IEC 61000-4-2 (ESD) and IEC 61000-4-4 (burst)
Software Support