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M81 - Mezzanine Card with 16 Digital Opto-Relay Outputs


The M81 is an M-Module with 16 fully isolated digital output channels that can switch DC as well as AC voltages and can also be used for analog signals. It is designed for industrial automation, medical computers, in-vehicle computers, and embedded computers in transportation.

  • M81 Product ImageM81 16 Digital Outputs
  • M81 Product Image

Main Features

  • 16 opto-relay outputs
  • 0 V to 36 V output voltage per channel
  • 500 mA output current per channel
  • Thermal and short-circuit protection
  • 500 V DC isolation from the system
  • 100 V DC isolation between the channels
  • -40 °C to +85 °C
M81 Product Image

Technical Data

Binary Outputs
  • Output Voltage: 0..36V
  • Output Current
    • Max. 500mA per channel
  • Switching Times
    • Turn-on time: 700µs typ.
    • Turn-off time: 40µs typ.
  • Thermal and short circuit protection
  • Outputs are designed for AC and DC operation
Peripheral Connection
Via front panel on a shielded 44-pin HD-Sub receptacle connector
M-Module Characteristics
A08, D16, IDENT
Electrical Specifications
  • Isolation voltage:
    • 500V DC between isolated side and digital side
    • All channels are optically isolated
  • Supply voltage/power consumption: +5V (4.85V..5.25V), 330mA max.
  • MTBF: 1,200,000h @ 40°C (derived from MIL-HDBK-217F)
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 72g
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C or -40..+85°C
    • Airflow: min. 10m³/h
  • Temperature range (storage): -40..+85°C
  • Relative humidity range (operation): max. 95% non-condensing
  • Relative humidity range (storage): max. 95% non-condensing
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..150Hz
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
  • MEN Driver Interface System (MDIS for Windows, Linux, VxWorks, QNX, OS-9)
  • For more information on supported operating system versions and drivers see Software.

Ordering Information

Standard M81 Models

16 digital outputs, fully isolated, -40°C to +85°C with qualified components

Miscellaneous Accessories

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)



The MDIS5 system package includes most standard device drivers for Linux available from MEN.


MDIS4/2004 / MDIS5 Windows driver (MEN) for M27, M28 and M81


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


MDIS4/2004 system (and device driver) package (MEN) for QNX, source code. This software package includes most standard device drivers available from MEN.


MDIS5 low-level driver sources (MEN) for M27, M28 and M81

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