NI 9401 5 V/TTL, Bidirectional Digital I/O, 8 Ch Module

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  • 8-channel, 100 ns high-speed digital I/O
  • 5 V/TTL, sinking/sourcing digital I/O
  • Compatible with NI CompactDAQ counters
  • 60 VDC, CAT I isolation
  • Industry-standard 25-pin D-SUB connector
  • -40 °C to 70 °C operating, 5 g vibration, 50 g shock
  • Configure Complete CompactRIO or NI CompactDAQ System
  • View Data Sheet
  • View Support Resources
The NI 9401 is an 8-channel, 100 ns bidirectional digital input module for any NI CompactDAQ or CompactRIO chassis. You can configure the direction of the digital lines on the NI 9401 for input or output by nibble (4 bits). Thus, you can program the NI 9401 for three configurations: eight digital inputs, eight digital outputs, or four digital inputs and four digital outputs. With reconfigurable I/O (RIO) technology (CompactRIO only), you can use the LabVIEW FPGA Module to program the NI 9401 for implementing custom, high-speed counter/timers; digital communication protocols; pulse generation; and much more. Each channel is compatible with 5 V/TTL signals and features 1,000 Vrms transient isolation between the I/O channels and the backplane.

Recommended Accessories
-The NI 9924 (or other 25-pin D-SUB connector)

EMC Performance
To ensure EMC compliance, you must use a ferrite bead, such as NI part number 782803-01.

Box Contents
-1 NI 9401 C Series module
-1 NI 9401 Operating Instructions and Specifications manual

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Specifications Documents

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Specifications Summary


To use the NI 9401 , you need all items in the diagram below. Select Option 1 if you already own a C Series System, or Option 2 if you do not already own a chassis, controller, or software.

Roll over the icons below to learn why you need each item in the system

C Series System

1 Terminal Block

1 Ferrite

NI 9401




NI 9401 and Accessories Only
NI 9401
- 779351-01 Qty $ 296 each
- 782401-01 Qty $ 431 each
Required Accessories
Qty $ 103 each
Ferrite -
EMI Suppression Ferrite for NI 9401 (qty 1) - 782803-01
Qty $ 4 each

Subtotal: $ 403

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Select a Platform and Configure a System

Create a complete system with the NI 9401 and its accessories. However, the NI 9401 is compatible with multiple C Series Platforms, NI CompactDAQ and CompactRIO. Please review the comparison information below and select a platform to begin configuring your system.

Configure System Configure System

NI CompactDAQ NI CompactRIO
Mixed-Measurement Data Acquisition

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Time-Critical Control & Monitoring

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Features NI CompactDAQ NI CompactRIO
USB, Wi-Fi, Ethernet, Headless Operation Ethernet, Headless Operation
Up to -40 to 70 C
Up to 50 g shock and 5 grms operational vibration
Up to -40 to 70 C
Up to 50 g shock and 5 grms operational vibration
LabVIEW, LabVIEW Real-Time, C, C++, VB.NET, C#.NET LabVIEW, LabVIEW Real-Time, LabVIEW FPGA, C, C++
NI-DAQmx driver; configuration and troubleshooting tools; short time to first measurement NI-RIO driver; flexibility and customizabilty
PC-based data acquisition; embedded data-logging; portable and benchtop Single-point acquisition; closed-loop control; deterministic operation

System Assurance Programs

Reduce your setup time and total cost of ownership, and get a system you can use out of the box with National Instruments system assurance programs. System assurance programs include:

  • Installation and integration test of all individual hardware
  • Courtesy installation of system driver sets and application development environments
  • Extended warranty and calibration coverage for up to five years
  • Custom documentation plus a custom restore and startup utility

This service is only available for PXI, NI CompactRIO, and NI Compact FieldPoint systems.

Extended Warranties

National Instruments designs and manufactures all products to minimize failures, however unexpected failures can still occur. Extended warranties provide a fixed economical price at the time of system purchase, covering any repair costs for up to three years. In addition, they offer the following benefits:

  • Significant cost savings compared to individual repair incidents
  • Fault location, diagnostics, and repair by NI any time the system product fails
  • All parts and labor costs covered as well as any adjustments needed to restore the hardware to manufacturing specifications

For more information about your warranty options:


NI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. NI provides manual calibration procedures, services to recalibrate your products, and automated calibration software to calibrate many NI measurement products.


NI training is the fastest, most certain route to productivity with NI tools and successful application development.

Repair Services

Return your registered product under warranty at no additional labor and parts cost. NI offers fault location, diagnostics, and repair any time the system fails as well as any adjustments needed to restore the hardware to manufacturing specifications.

Technical Support

Additional Product Information

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