©2019 Device Engineering Inc.

Page 6 of 12

DS-MW-01067-01 Rev G

2/7/2019

Lightning Protection

DIN inputs are designed to survive lightning induced transients as defined by RTCA DO160, Section 22, Level 3 pin

injection waveforms 3, 4, and 5A. See waveforms below.

0

t

V/I

25% to 75%

of Largest Peak

50%

Largest

Peak

Figure 6 Voltage / Current Waveform 3

Figure 7 Voltage / Current Waveform 4

Waveform Source Impedance characteristics:

· Waveform 3 Voc / Isc = 600 V / 24 A => 25 Ω

· Waveform 4 Voc / Isc = 300 V / 60 A => 5 Ω

· Waveform 5A Voc / Isc = 300 V / 300 A => 1 Ω

t

0

50%

Peak

T1

T2

V/I

T1 = 40 us

T2 = 120 us

Figure 8 Voltage / Current Waveform 5A

t

0

50%

Peak

T1

T2

V

T1 = 6.4 µs

T2 = 70 µs