BC847BS_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 18 February 2009

4 of 12

NXP Semiconductors

BC847BS

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

6.

Thermal characteristics

[1]

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

[2]

Table 6.

Thermal characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Per transistor

thermal resistance from

junction to ambient

in free air

[1] -

-

568

K/W

[2] -

-

500

K/W

thermal resistance from

junction to solder point

-

-

230

K/W

Per device

thermal resistance from

junction to ambient

in free air

[1] -

-

416

K/W

[2] -

-

313

K/W

FR4 PCB, standard footprint

Fig 2.

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

typical values

006aab420

10

1

10

(K/W)

1

δ = 1

0.75

0.50

0.33

0.10

0.05

0.02

0.01

0

0.20