AN2689 datasheet(20/42 Pages) STMICROELECTRONICS

20 / 42 page

Data line protection

AN2689

20/42

Doc ID 14310 Rev 3

Figure 23.

Package and internal circuit of the ESDA25LY

This device has the following characteristics:

Figure 24.

Peak pulse power versus exponential time duration

In the same way as for the SM6T27AY, the calculations give:

Rd = 1 , Vcl = 42.5 V, Ipp = 12.5 A

then Ppp = 531 W

and the t’ current pulse duration is still 457 ns.

Figure 24 shows that for 457 ns pulse duration the maximum power the ESDA25LY can

dissipate is higher than 2 kW. The ambient temperature derating makes a maximum power

dissipation higher than 1.5 kW so the ESDA25LY device would be suitable in this protection

application.

Table 4.

ESDA25LY electrical characteristics

Order code

VBR @ IR

IRM @ VRM

VF@ IF

TC

min.

max.

typ.(1)

Square pulse, Ipp = 15 A, tp = 2.5 µs.

max.(2)

 VBR = T* (T

amb - 25 °C) * VBR (25 °C)

typ.

0 V bias

µA



10-4/°C

ESDA25LY

1.2

1000

100

1000

3000

t (µs)

(W)

T initial = 25°C

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