MARCH 1994 - REVISED MARCH 2006

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

TISP3xxxF3 (HV) Overvoltage Protector Series

APPLICATIONS INFORMATION

Protection Voltage

7 ). An estimate of the di/dt can be made from the surge generator voltage rate of rise, dv/dt, and the circuit resistance.

As an example, the ITU-T K.21 1.5 kV, 10/700 µs surge has an average dv/dt of 150 V/µs, but, as the rise is exponential, the initial dv/dt

is higher, being in the region of 450 V/µs. The instantaneous generator output resistance is 25 Ω. If the equipment has an additional

series resistance of 20 Ω, the total series resistance becomes 45 Ω. The maximum di/dt then can be estimated as 450/45 = 10 A/µs. In

practice, the measured di/dt and protection voltage increase will be lower due to inductive effects and the finite slope resistance of the

Capacitance

Off-state Capacitance

Figure 17.

V

1

10

100

1000

0.70

0.75

0.80

0.85

0.90

0.95

1.00

1.05

AIXXAA

Normalized to V

DC Bias, V

NORMALIZED CAPACITANCE

vs

RMS AC TEST VOLTAGE