6

TransGuard

®

AVX Multilayer Ceramic Transient Voltage Suppressors

Multilayer construction and improved grain structure result in

excellent transient clamping characteristics up to 20 amps

peak current, while maintaining very low leakage currents

under DC operating conditions. The VI curves below show the

voltage/current characteristics for the 5.6V, 9V, 14V, 18V and

low capacitance StaticGuard parts with currents ranging from

parts of a micro amp to tens of amps.

Traditionally varistors have suffered degradation of electrical

performance with repeated high current pulses resulting in

decreased breakdown voltage and increased leakage cur-

rent. 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 TransGuard tran-

sient voltage suppressors with 150Amp 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.

VOLTAGE/CURRENT CHARACTERISTICS

PULSE DEGRADATION

VC04LC18V500

VC040214X300

VC040218X400

VC040205X150

VC040209X200

100

80

60

40

20

0

10

Current (A)

VC04LC18V500

VC040214X300

VC040218X400

VC040205X150

VC040209X200

10

100

1000

10000

8kV ESD STRIKES

35

30

25

20

15

10

5

VC040205X

VC04LC18V

VC040214X

VC040218X

VC040209X

0

-5

-10

-15

-20

-25

0.01

0.1

1

10

Frequency (GHz)

VC04LC18V500

VC040214X300

VC040218X400

VC040205X150

VC040209X200

1300

1200

10

100

1000

IMPULSE DURATION (

µS)

1100

1000

900

800

700

600

500

400

300

200

100

0

PEAK POWER VS PULSE DURATION

INSERTION LOSS CHARACTERISTICS

ESD TEST OF 0402 PARTS