10

TransGuard

®

AVX Multilayer Ceramic Transient Voltage Suppressors

Repetitive Peak Current Strikes

TransGuard 1210 1.5J Product

10%

8%

4%

2%

0%

6%

0

100

200

300

400

500

600

Number of Strikes

VC121018J390

Figure 3

30%

25%

15%

5%

10%

0%

20%

0

100

200

300

400

500

600

Number of Strikes

VC08LC18A500

Figure 4

Repetitive Peak Current Strikes

StaticGuard 0805 0.1J Product

PULSE DEGRADATION

Traditionally varistors have suffered degradation of electrical perfor-

mance with repeated high current pulses resulting in decreased

breakdown voltage and increased leakage current. It has been

suggested that irregular intergranular boundaries and bulk material

result in restricted current paths and other non-Schottky barrier

paralleled conduction paths in the ceramic. Repeated pulsing of

both 5.6 and 14V TransGuard transient voltage suppressors with

150 Amp peak 8 x 20µS waveforms shows negligible degradation

in breakdown voltage and minimal increases in leakage current.

This does not mean that TransGuard suppressors do not suffer

degradation, but it occurs at much higher current. The plots

of typical breakdown voltage vs number of 150A pulses are

shown below.

VC060305A150

VC060326A580

VC06LC18X500

100

80

60

40

20

0

020

40

Frequency (MHz)

60

80

100

VC080518C400

VC080514A300

VC080505C150

100

80

60

40

20

0

020

40

Frequency (MHz)

60

80

100

VC120648D101

VC12LC18A500

VC120614D300

100

80

60

40

20

0

020

40

Frequency (MHz)

60

80

100

TransGuard Capacitance vs Frequency 0603

TransGuard Capacitance vs Frequency 0805

TransGuard Capacitance vs Frequency 1206

10%

8%

4%

2%

0%

6%

0

100

200

300

400

500

600

Number of Strikes

VC120618D400

VC120626D580

VC120614D300

VC120605D150

Figure 1

Repetitive Peak Current Strikes

TransGuard 0805 0.1J and 0.3J Products

0%

5%

10%

15%

0

100

200

300

400

500

600

Number of Strikes

VC080518C400

VC080518A400

Figure 2

Repetitive Peak Current Strikes

TransGuard 1206 0.4J Product

CAPACITANCE/FREQUENCY

CHARACTERISTICS