TSP058SA - TSP320SA
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
• Select device with an off-state voltage rating (VDRM) above the maximum operating voltage at the minimum operating temperature.
3. Select surge current ratings (IPPS and ITSM) ≥ 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
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
MAXIMUM SURGE RATINGS (TJ = 25 °C UNLESS OTHERWISE NOTED)
Short-Circuit Current Wave 2/10 µs
Open-Circuit Voltage Wave 2/10 µs
Non-Repetitive Peak Pulse Current
8/20 µs 10/160 µs 5/310 µs 10/560 µs 10/1000 µs
1.2/50 µs 10/160 µs 10/700 µs 10/560 µs 10/1000 µs
On-State Surge Current
1. Thermal accumulation between successive surge tests is
2. The device under test initially must be in thermal
equilibrium with TJ = 25 °C.
3. Test at 1 cycle, 60 Hz.
4. Surge ratings are non-repetitive because instantaneous
junction temperatures may exceed the maximum rated TJ.
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
6. The waveform is defined as A/B ms where:
A: (Virtual front time) = 1.25 X Rise time = 1.25 X (Tb - Ta)
B (Duration time to 50% level of Ipps) = T1 - T0
Ver: June 2001