PAGE 2

Ver: June 2001

TSP058SB - TSP320SB

SELECTION GUIDE

Follow these steps to select the proper Thyristor surge protector for your application:

1. Define the operating parameters for the circuit:

• Ambient operating temperature range

• Maximum telephone line operating current (highest battery and shortest copper loop)

• Maximum operating voltage: (Maximum DC bias + peak ringing voltage)

• Maximum surge current

• System voltage damage threshold

≥ those which the application must withstand.

4. Verify that the minimum holding current of the device at the maximum ambient temperature is above the maximum dc current of the

system.

5. Verify that the maximum breakover voltage of the device is below the system damage threshold.

6. Verify that the circuit's ambient operating temperatures are within the device's operating temperature range.

7. Verify that the device's dimensions fit the application's space considerations.

8. Independently evaluate and test the suitability and performance of the device in the application

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Notes:

1. Thermal accumulation between successive surge tests is

not allowed.

2. The device under test initially must be in thermal

3. Test at 1 cycle, 60 Hz.

4. Surge ratings are non-repetitive because instantaneous

Nevertheless, devices will survive many surge applications

without degradation. Surge capability will not degrade over

a device's typical operating life.

5. Adjust the surge generator for optimum current-wave

accuracy when both voltage and current wave

specifications cannot be exactly met. The current wave is

more important than the voltage wave for accurate surge

evaluation.

6. The waveform is defined as A/B ms where:

0%

20%

40%

60%

80%

100%

Time

% Ipps

Tb

Ta

T1

To