Aliso Viejo, CA (July 12, 2023) – Holt Integrated Circuits has published a new application note (AN-303) which provides guidelines for protection against lightning induced transients applied to Holt’s latest ARINC 429 products. Many of these products, such as HI-35930 protocol family, HI-8450/4/8 line receiver families, HI-8460 galvanically isolated line receiver family and HI-8597 line driver family have on-chip built-in lightning protection against Level 3 pin injection waveforms.
The circuits recommended in AN-303 were all tested according to RTCA/DO-160G, Section 22, Level 3 and Level 4 Pin Injection Test Waveform Set A (3 & 4), Set B (3 & 5A) and Set Z (3 & 5B). Pin surge levels for Level 3 and 4 are listed in a matrix of four separate pin injection threats shown below:
|
Level
|
Waveforms
|
|
|
3
VOC/ISC
|
4
VOC/ISC
|
5A
VOC/ISC
|
5B
VOC/ISC
|
|
3
|
600/24
|
300/60
|
300/300
|
300/300
|
|
4
|
1500/60
|
750/150
|
750/750
|
750/750
|
The move from aluminum to newer composite air frames has made lightning susceptibility a major issue in aircraft design and reliability. This application note provides customers with proven lightning protection circuits to achieve Level 3 & 4 pin injection per DO-160 Section 22 for the latest Holt ARINC 429 devices. Holt’s recommendations were created to meet the entire range of pin injection waveform sets for DO-160 Section 22 with the smallest footprint possible.
Holt’s solution is determined through extensive testing and empirical data. The test solution is subjected to the most extreme conditions, which exceed DO-160 requirements and ensure there is adequate margin for component performance. Protection components recommended by Holt are tied to chip ground and should be located near the chip pins on the same board.
Holt also provides additional application notes for lightning protection of other device families; AN-302 for ARINC 825 (CAN) products, AN-304 for RS-485 products and AN-305 for Discrete-to-Digital products.
To request information on Holt’s ARINC 429, CAN, MIL-STD-1553 and other aerospace products, readers should contact Holt at (949) 859-8800, by e-mail at info@holtic.com, or visit the Holt Web site at www.holtic.com.
About Holt Integrated Circuits
Located in Aliso Viejo, CA, Holt Integrated Circuits is a major supplier of ICs for avionics and military aircraft data bus and display applications. The company’s products are specified by more than 400 manufacturers worldwide and are employed in flight control, navigation, engine management, communications, safety equipment, and in-flight entertainment systems.
Holt’s range of ICs supporting the ARINC 429 standard is the widest in the industry, and its MIL-STD-1553 transceivers are recognized as the industry’s smallest, having the lowest power consumption. In addition, Holt MIL-STD-1553 integrated terminals offer the most compact, cost effective solution available, integrating protocol, transceiver and transformers in a single 15x15mm package. Holt also offers its MIL-STD-1553 protocol as a DAL A, DO-254 Certifiable IP Core. Other data bus products include ARINC 717, CAN (ARINC 825), Ethernet, RS-485/422, discrete-to-digital and analog switches.
Select products are available to DSCC SMD specifications. Holt also offers product compliant to the European Union "RoHS Directive /95/EC".
Holt Integrated Circuits is AS9100D:2016 and ISO 9001:2015 registered.