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M66 - Mezzanine Card with 32 Digital Inputs/Outputs


The M66 is an M-Module with 32 inputs or 32 outputs or mixed I/O in groups of 4. It is designed for industrial automation, medical computers, in-vehicle computers, and embedded computers in transportation.

  • M66 Product ImageM66 32 Digital Inputs/Outputs
  • M66 Product Image

Main Features

  • 32 inputs 0 V to 32 V or
  • 32 outputs 12 V to 32 V or
  • Mixed I/O in groups of 4
  • 1.9 A output current per channel
  • 16 A switching power on one M66
  • Load on ground
  • Optical isolation
  • -40 °C to +85 °C versions
M66 Product Image

Technical Data

Digital I/O
  • 32 digital signals
    • 4 optically isolated units
    • 8 channels for each unit
  • Individual use of each channel as input or output
  • Individual edge-triggered interrupts
  • Input/output load on ground
  • High-side switching
  • Over-current and over-temperature protection
Digital Output Characteristics
  • Output voltage range: 12 V to 32 V
  • Output current: Logical low max. 10 µA
  • Output current: Logical high max. 1.9 A (per channel)
  • Output current: Logical high max. 4 A (per unit)
  • Switching time for output change: 200 µs typ.
  • Isolation voltage (optocoupler): 500 V DC
Digital Input Characteristics
  • Input voltage min.: 0 V
  • Input voltage max. external supply voltage (12 V to 32 V)
  • Voltage level: Logical low 0 V to 6 V or open
  • Voltage level: Logical high 12 V to 32 V
  • Input current: Logical high 4.4 mA @ 24 V
  • Switching threshold: 9.2 V @ 0.78 mA typ.
  • Switching time for input change: 200 µs typ.
  • Excess voltage protection: ± 50V
  • Digital I/O
    • 32x digital output, isolated, HD-Sub, 44-pin, receptacle
    • 32x digital input, isolated, HD-Sub, 44-pin, receptacle
  • M-Module
    • 1x A08/D08/INTA/IDENT, board to board
Product Standard
M-Module: ANSI/VITA 12-1997 (S2012)
Electrical Specifications
  • Supply voltage
    • +5 V (-3%/+5%)
    • +24 V (external supply voltage 12 V to 32 V)
  • Power consumption
    • 1 W typ. @ +5 V
    • 1.104 W typ. @ +24 V
  • Isolation voltage:
    • 500 V DC between isolated side and digital side
    • 180V DC between the channels
    • Voltage between the connector shield and isolated ground is limited to 180 V using a varistor; AC coupling between connector shield and isolated ground through 47 nF capacitor
Mechanical Specifications
  • Dimensions standard: M-Module: (W) 149 mm, (D) 53 mm
  • Weight: 110 g
Environmental Specifications
  • Operating temperature
    • 0°C to +60°C or -40°C to +70°C
    • -40°C to +85°C with an airflow of 1.0 m/s
  • Storage temperature: -40°C to +85°C
  • Relative humidity range (operation): max. 95% without condensation
  • Relative humidity range (storage): max. 95% without condensation
  • Altitude: -300 m to +3000 m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10 Hz to 150 Hz
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
  • EN 55022 (radio disturbance)
  • IEC 61000-4-2 (ESD)
  • IEC 61000-4-4 (burst)
MTBF: 45 000h @ 50°C (derived from MIL-HDBK-217F)
Software Support
  • MEN Driver Interface System (MDIS for Windows, Linux, VxWorks, QNX)
  • For more information on supported operating system versions and drivers see Software.

Ordering Information

Standard M66 Models

32 digital inputs and/or outputs, 0°C to +60°C


32 digital inputs, 0°C to +60°C


32 digital inputs and/or outputs, -40°C to +85°C screened

Miscellaneous Accessories

M-Module cable, 2m, with 44-pin half-pitch D-Sub plug/housing to 50-pin D-Sub receptacle/housing, (connecting 1:1)


M-Module cable, 2.5m, with 44-pin HD-Sub plug/housing to pig tail


25 mounting screw sets to fix M-Modules on carrier boards (3 different screw types, 50 pieces each)



MDIS5 low-level driver sources (MEN) for M66, A302 and D302


MDIS5 System (and Device Driver) Package (MEN) for Linux. 
This software package includes most standard device drivers available from MEN.


MDIS5 Windows driver (MEN) for M66, A302 and D302


MDIS5 low-level driver sources (MEN) for M66, A302 and D302


MDIS5 System (and Device Driver) Package (MEN) for VxWorks. This software package includes most standard device drivers available from MEN.


MDIS5 low-level driver sources (MEN) for M66, A302 and D302


MDIS4 system (and device driver) package (MEN) for QNX, source code. This software package includes most standard device drivers available from MEN.

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