Choosing the appropriate Schottky diode

AN3361

12/15

Doc ID 018589 Rev 1

In the example, we have selected the STPS5H100BY where:

The derating curve Figure 11 shows the equivalent avalanche power the STPS5H100BY is

Therefore in this example the STPS5H100BY meets the ISO 7637-2 requirements and

ensures a good reverse battery protection.

Figure 11.

Normalized avalanche power derating versus pulse duration for

STPS5H100BY

Note:

The derating curve for STPS5H100BY can be found as Figure 3 in the datasheet for this

device.

Table 6 indicates which Schottky diode can withstand Pulse 1 of ISO 7637-2 standard.

Table 6 shows that only a few Schottky diodes can handle this constraint.

0.001

0.01

0.1

0.01

1

0.1

0.035

120 µs

10

100

1000

1

P(t )

P

(1µs)

ARM

p

ARM

t (µs)

p

Table 6.

Compliance of Schottky diodes with ISO 7637-2 Pulse 1

Pulse 1 surge voltage (V)

STPS2H100UY

Yes

STPS5H100BY

Yes

STPS8H100GY

Yes