SMA4F datasheet(3/9 Pages) STMICROELECTRONICS

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SMA4F

Characteristics

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Figure 1.

Definition of Ipp pulse

Table 4.

Electrical characteristics - values (Tamb = 25 °C)

Type

IRM max@VRM

VBR @IR

(1)

VCL @IPP

10/1000 µs

(2)

10/1000 µs

VCL @IPP

8/20 µs

(2)

8/20 µs

αT(3)

25 °C 85 °C

min

typ

max

µA (Max)

10-4/°C

SMA4F5.0A

5.0 6.40 6.74 7.10 10

9.2

43.5

0.048

13.4 174

0.036

5.7

Pulse test: tp <50ms.

To calculate maximum clamping voltage at other surge currents, use the following formula

VCLmax = RD x IPP + VBRmax

To calculate VBR versus junction temperature, use the following formula:

VBR @ Tj = VBR @ 25 °C x (1 + αT x (Tj - 25))

100

%IPP

Repetitive peak pulse current

tr = rise time (µs)

tp = pulse duration time (µs)

Figure 2.

Relative peak power dissipation

versus initial junction temperature

Figure 3.

Peak pulse power versus

exponential pulse duration

(Tj initial = 25 °C)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

100

125

150

175

200

PP[Tj initial] / PPP[Tj initial=25°C]

initial (°C)

(kW)

1.E-01

1.E+00

1.E+01

1.E+02

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

j initial = 25 °C

t (ms)

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