Discrete-to-Digital / Drivers

Holt’s range of Discrete-to-Digital components provides a robust solution for sensing Open / Ground and 28V / Open discrete signals. These devices are typically used in simple sensing applications such as detecting open hatches or doors.

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Selector Guide
    DeviceDevice TypeDescriptionReleasedDatasheet
    HI-8421616−Channel Low-side driverProgrammable over Serial Peripheral Interface (SPI). Accurate Load Current Sensing with built-in ADC.2024
    HI-84216 Rev. B - updated
    3/11/2025
    HI-84004-channel Open/Ground
    or 28V/Open with galvanic isolation    		Galvanically isolated 4-channel discrete-to-digital sensor with SPI interface. Galvanic isolation provides 800V isolation between each of the sensors and the logic interface.2018
    HI-8400 Rev. New - updated
    8/8/2018
    HI-84298-channel Open/Ground
    or 28V/Open    		Octal discrete sensing device with individually configurable channels and SPI interface. Built-in lightning protection (DO-160G, Level 3). Includes sensor output interrupt pin and optional debounce circuit.2014
    HI-8429 Rev. H - updated
    10/19/2023
    HI-843532-channel Open/Ground
    or 28V/Open    		Lightning protected 32-channel discrete sensing device with SPI interface.2013
    HI-8435 Rev. N - updated
    3/13/2025
    HI-8436Low threshold 32-channel Open/Ground
    or 28V/Open    		Low Threshold lightning protected 32-channel discrete sensing device with SPI interface.2013
    HI-8436 Rev. K - updated
    3/13/2025
    HI-8437Low threshold 32-channel sensorLow Threshold, lightning protected, 32-channel high impedance discrete sensing device with SPI interface.2013
    HI-8437 Rev. D - updated
    6/18/2020
    HI-84276-channel Open/Ground
    with galvanic isolation    		Galvanically isolated 6-channel discrete-to-digital sensor with two GND/Open Sense Modes: 0 to 5V and 4.5V to 10.5V. 400V Galvanic isolation between sensor inputs and logic interface.2022
    HI-8427 Rev. B - updated
    3/28/2024
    HI-84288-channel Open/Ground
    or 28V/Open    		Octal discrete sensing device with individually configurable channels and SPI interface. Built-in lightning protection (DO-160G, Level 3). Drop-in replacement for DEI1282.2014
    HI-8428 Rev. B - updated
    6/7/2017
    HI-8428-R8-channel Open/Ground
    or 28V/Open    		Octal discrete sensing device with individually configurable channels and SPI interface. Drop-in replacement for DEI1284.2014
    HI-8428-R Rev. A - updated
    9/16/2014
    HI-847016-channel Open/Ground or 28V/Open sensor inputs with ARINC 429 TransmitterARINC 429 Line Driver with Built-In Lightning Protection (DO-160G, Level 3) and 16-Channel Discrete-to-Digital sensor inputs.2013
    HI-8470 Rev. E - updated
    3/14/2019
    HI-8425
    HI-8426    		Octal Open/Ground
    or 28V/Open    		Lightning protected octal discrete sensing device with quad low-side drivers.2012
    HI-8425 Rev. Q - updated
    3/7/2025
    HI-8430
    HI-8431    		Octal Open/Ground
    or 28V/Open    		Lightning protected octal discrete sensing device with quad high-side drivers.2012
    HI-8430 Rev. M - updated
    3/7/2025
    HI-84200Open/Ground, 6 channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84200 Rev. New - updated
    8/30/2018
    HI-84230Open/Ground, 8 channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84200 Rev. New - updated
    8/30/2018
    HI-84201Open/Ground, 6 channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84201 Rev. New - updated
    8/30/2018
    HI-84231Open/Ground, 8 channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84201 Rev. New - updated
    8/30/2018
    HI-8421028V/Open, 6 channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84210 Rev. New - updated
    8/30/2018
    HI-8424028V/Open, 8 channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84210 Rev. New - updated
    8/30/2018
    HI-84220Open/Ground, 8 Channels and 28V/Open, 8 Channels
    Lightning Protected    		Discrete input sensing device with internally lightning protected sensor inputs and tri-state outputs.2018
    HI-84220 Rev. A - updated
    4/24/2025
    HI-8420Open/Ground
    6 channels    		Discrete input sensing device with tri-state outputs.2001
    HI-8420 Rev. F - updated
    12/13/2013
    HI-8423Open/Ground
    8 Channels    		Discrete input sensing device with tri-state outputs.2001
    HI-8420 Rev. F - updated
    12/13/2013
    HI-842128V/Open
    6 Channels    		Discrete input sensing device with tri-state outputs.2001
    HI-8421 Rev. G - updated
    12/13/2013
    HI-842428V/Open
    8 Channels    		Discrete input sensing device with tri-state outputs.2001
    HI-8421 Rev. G - updated
    12/13/2013
    HI-8422Open/Ground
    8 Channels and 28V/Open
    8 Channels    		Discrete input sensing device with tri-state outputs.2001
    HI-8422 Rev. H - updated
    9/10/2014