Holt Company Insulated Discrete - Digital HI-8400
A robust solution for detecting OPEN/GND and 28V/OPEN discrete signals.
The HI-8400 is an isolated 4-channel discrete-digital sensor designed to output sensor data via SPI or a parallel bus interface. The isolation provides 800V of separation between each sensor and the logic interface, making it an ideal device for systems that need to accommodate various grounds. Each input can be individually pin-configured as GND/OPEN or 28V/OPEN. The discrete input thresholds comply with Airbus ABD0100H and MIL-STD-704 specifications. This device operates with a digital power supply of 3.3V (±5%) or 5.0V (±5%) for each isolated sensor and a 28V analog power supply. When GND/OPEN mode is selected on its pin, a 1mA wetting current is supplied from the input network of each SENSE input. The wetting current helps prevent dry relay or switch contacts. The sensor output interrupt pin alerts the system to changes in the sensor input, avoiding the need for regular polling via SPI to check the status.
basic information
■Features - Sensor threshold compliant with Airbus ABD0100H and MIL-STD-704 standards - Sensor data output read via SPI or parallel bus - Interrupt generation when the sensor state changes - Isolated discrete - Digital sensors provide 800V isolation between each sensor and the logic interface - Configurable as GND/OPEN or 28V/OPEN on individual pins - Lightning protection input per RTCA/DO-1060G, Section 22, Level 3 - Efficient board routing possible through daisy-chain connection of parts via 5MHz SPI - Resistant to careless applications of 115VAC/400Hz power supply for input sensing - Operating temperature range: -40℃ to +85℃ - Extended operating temperature range: -55℃ to +125℃ ■MIL-STD-1553 - Japanese technical documentation for ARINC 429 communication standards is available. If you would like to see it, please contact sales@nacelle.co.jp.
Price range
Delivery Time
Model number/Brand name
HI-8400PQM、HI-8400PQMF、HI-8400PQT、HI-8400PQTF
Applications/Examples of results
Aviotics Discrete Sensing Applications
Line up（19）
| Model number | overview |
|---|---|
| HI-8400 | ＜4CH, OPEN/GND or 28V/OPEN, isolation＞ Isolated 4CH discrete - digital sensor with SPI interface. Isolation provides 800V isolation between each sensor and the logic interface. |
| HI-8429 | ＜8CH, OPEN/GND or 28V/OPEN＞ 8CH discrete sensing device with individually configurable channels and SPI interface. Built-in lightning protection (DO-160G, Level 3). |
| HI-8435 | ＜32CH, OPEN/GND or 28V/OPEN＞ Lightning protected 32CH discrete sensing device with SPI interface. |
| HI-8436 | ＜Low threshold 32CH OPEN/GND or 28V/OPEN＞ Low threshold, lightning protected 32CH discrete sensing device with SPI interface. |
| HI-8437 | ＜Low threshold 32CH sensor＞ Low threshold, lightning protected 32CH high impedance discrete sensing device with SPI interface. |
| HI-8428 | ＜8CH, OPEN/GND or 28V/OPEN＞ 8CH discrete sensing device with individually configurable channels and SPI interface. Built-in lightning protection (DO-160G, Level 3). Drop-in for DEI1282. |
| HI-8428-R | ＜8CH, OPEN/GND or 28V/OPEN＞ 8CH discrete sensing device with individually configurable channels and SPI interface. Drop-in for DEI1284. |
| HI-8470 | ＜ARINC 429 transmitter with 16 channel OPEN/GND or 28V/OPEN sensor input＞ ARINC 429 line driver with built-in lightning protection (DO-160G, Level 3) and 16CH discrete - digital sensor input. |
| HI-8425 | ＜8CH OPEN/GND or 28V/OPEN＞ Lightning protected octal discrete sensing device with quad low-side driver. |
| HI-8426 | ＜8CH OPEN/GND or 28V/OPEN＞ Lightning protected octal discrete sensing device with quad low-side driver. |
| HI-8430 | ＜8CH OPEN/GND or 28V/OPEN＞ Lightning protected octal discrete sensing device with quad high-side driver. |
| HI-8431 | ＜8CH OPEN/GND or 28V/OPEN＞ Lightning protected octal discrete sensing device with quad high-side driver. |
| HI-84200 | ＜OPEN/GND, 6CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
| HI-84230 | ＜OPEN/GND, 8CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
| HI-84201 | ＜OPEN/GND, 6CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
| HI-84231 | ＜OPEN/GND, 8CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
| HI-84210 | ＜28V/OPEN, 6CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
| HI-84240 | ＜28V/OPEN, 8CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
| HI-84220 | ＜OPEN/GND, 8CH, 28V/OPEN, 8CH, lightning protection＞ Discrete input sensing device with lightning protected sensor input and tri-state output. |
