AN2064 - APPLICATION NOTE

7/14

Tables 3 and 4 show that the SMP100MC-270 complies with the CO US market standard requirements.

The telecom system design engineer must next define the suitable fuse. Figure 6 gives the surge

capability limit of the SMP100MC series TRISIL when submitted to the power fault disturbances. The

series overcurrent protection device cannot be a PTC due to its high resistance value, so the only choice

will be the fuse, which meets the following criteria:

. Shall not operate for 100A 10/1000µs surge

. Shall not operate for 500A 2/10µs surge

Symbol

Parameter

Value

Unit

Repetitive peak pulse current

10/1000 µs

8/20 µs

10/560 µs

5/310 µs

10/160 µs

1/20 µs

2/10 µs

100

400

140

150

200

400

500

A

Fail-safe mode : maximum current (note 1)

8/20 µs

5

kA

Non repetitive surge peak on-state current (sinusoidal)

t = 0.2 s

t = 1 s

t = 2 s

t = 15 mn

18

9

7

4

A

t = 16.6 ms

t = 20 ms

20

21

Storage temperature range

Maximum junction temperature

-55 to 150

150

°C

Maximum lead temperature for soldering during 10 s.

260

°C

Note 1: in fail safe mode, the device acts as a short circuit

0

10

20

30

40

50

60

70

1.E-02

1.E-01

1.E+00

1.E+01

1.E+02

1.E+03

Surge Current (A)

t(s)

F=50Hz

T initial = 25°C

j