Nexperia

BC857QAS

45 V, 100 mA PNP/PNP general-purpose transistor

BC857QAS

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Product data sheet

8 July 2015

4 / 13

9. Thermal characteristics

Table 6.

Thermal characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Per transistor

thermal resistance

from junction to

ambient

in free air

[1]

-

-

543

K/W

Per device

thermal resistance

from junction to

ambient

in free air

[1]

-

-

357

K/W

[1] Device mounted on an FR4 PCB, single-sided copper, tin-plated and standard footprint.

aaa-007378

10

1

10

(K/W)

1

duty cycle =

1

0.75

0.5

0.33

0.2

0.1

0.02

0.01

0

0.05

FR4 PCB, standard footprint

Fig. 3. Per transistor: Transient thermal impedance from junction to ambient as a function of pulse duration;

typical values