National Instruments NI-9437 C Series sinking digital input module

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National Instruments · CompactDAQ and CompactRIO

NI-9437

The NI-9437 is an eight-channel C Series sinking digital input module for 24–250 VDC signals. It supports CompactDAQ and CompactRIO systems and uses a supply-referenced switching threshold.

ManufacturerNational Instruments

ModelNI-9437

Product TypeC Series sinking digital input module

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Digital inputs8 sinking channels

Logic range24–250 VDC

Input delay1 µs maximum

Threshold referenceNominally two-thirds of VSUP

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Overview

Product overview

Key product information and technical features.

Designed for high-voltage digital signals, the NI-9437 fits rail, power, industrial and automotive applications. Its ratiometric threshold follows the user supply voltage rather than using a fixed switching level.

All eight inputs share one VSUP terminal and therefore one threshold reference. The module provides earth-ground isolation, not channel-to-channel isolation.

Eight sinking digital inputs for high-voltage DC logic.
Supply-tracking ratiometric switching threshold.
Supports access to CompactDAQ chassis counter inputs.

Verified specifications

Technical data

Verified product specifications.

Digital input channels	8 channels
Input type	Sinking
Logic voltage range	24–250 VDC
Maximum input delay	1 µs
Channel-to-channel isolation	None

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National Instruments

Manufacturer

CompactDAQ / CompactRIO

Host platforms

NI-9437

C Series digital input module

Compatibility

Designed for NI CompactDAQ and CompactRIO chassis and controllers.

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Manuals & software

Technical resources

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NI-9437 Product Page and Variant TableProduct Page · ni.com

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NI 9437 DatasheetDatasheet · download.ni.com

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NI 9437 Getting Started GuideGetting Started Guide · download.ni.com

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CompactDAQ Module Support for Accessing On-board CountersTechnical resource

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CompactDAQ

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FAQ

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Product-specific answers based on available technical information.

Does each input have its own threshold reference?

No. All eight inputs share VSUP and use the same supply-referenced threshold.

Is part number 783737-01 a screw-terminal version?

No. NI identifies 783737-01 as the spring-terminal version and 783393-01 as a screw-terminal version. This catalog record contains conflicting terminal information, so its exact variant needs confirmation.