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Discrete-to-Digital

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.

Device	Device Type	Description	Released	Datasheet
HI-8400	4-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-8429	8-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...	2014	HI-8429 Rev. H - updated 10/19/2023
HI-8435	32-channel Open/Ground or 28V/Open	Lightning protected 32-channel discrete sensing device with SPI interface.	2013	HI-8435 Rev. L - updated 6/18/2020
HI-8436	Low threshold 32-channel Open/Ground or 28V/Open	Low Threshold lightning protected 32-channel discrete sensing device with SPI interface.	2013	HI-8436 Rev. H - updated 5/5/2023
HI-8437	Low threshold 32-channel sensor	Low Threshold, lightning protected, 32-channel high impedance discrete sensing device with SPI interface.	2013	HI-8437 Rev. D - updated 6/18/2020
HI-8427	6-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-8428	8-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-R	8-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 10/16/2015
HI-8470	16-channel Open/Ground or 28V/Open sensor inputs with ARINC 429 Transmitter	ARINC 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. P - updated 10/12/2023
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. L - updated 10/19/2023
HI-84200	Open/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-84230	Open/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-84201	Open/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-84231	Open/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-84210	28V/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-84240	28V/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-84220	Open/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. New - updated 8/30/2018
HI-8420	Open/Ground 6 channels	Discrete input sensing device with tri-state outputs.	2001	HI-8420 Rev. F - updated 12/13/2013
HI-8423	Open/Ground 8 Channels	Discrete input sensing device with tri-state outputs.	2001	HI-8420 Rev. F - updated 12/13/2013
HI-8421	28V/Open 6 Channels	Discrete input sensing device with tri-state outputs.	2001	HI-8421 Rev. G - updated 12/13/2013
HI-8424	28V/Open 8 Channels	Discrete input sensing device with tri-state outputs.	2001	HI-8421 Rev. G - updated 12/13/2013
HI-8422	Open/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

Discrete-to-Digital

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