EMI8141, EMI8142, EMI8143

http://onsemi.com

5

TRANSMISSION LINE PULSE (TLP) MEASUREMENTS

Transmission Line Pulse (TLP) provides current versus voltage (I−V) curves in which each data point is obtained from a

100 ns long rectangular pulse from a charged transmission line. A simplified schematic of a typical TLP system is shown in

Figure 4. TLP I−V curves of ESD protection devices accurately demonstrate the product’s ESD capability because the 10 s

of amps current levels and under 100 ns time scale match those of an ESD event. This is illustrated in Figure 5 where an 8 kV

IEC61000−4−2 current waveform is compared with TLP current pulses at 8 A and 16 A. A TLP curve shows the voltage at

which the device turns on as well as how well the device clamps voltage over a range of current levels. Typical TLP I−V curves

for the EMI814x are shown in Figure 4.

L

SW

50

W Coax Cable

10 MQ

Attenuator

÷

50

W Coax Cable

DUT

Oscilloscope

Figure 4. Simplified Schematic of a Typical TLP System

Figure 5. Comparison Between 8 kV IEC6100

0-4-2 and 8 A and 16 A TLP Waveforms

18

16

14

12

10

8

6

4

2

0

02

18

16

14

12

46

8

10

0

−2

−18

−14

−12

−4

−6

−8

−10

−18

−16

−14

−12

−10

−8

−6

−4

−2

0

Figure 6. Positive and Negative TLP Waveforms

−16