NXP Semiconductors
BC640; BCP53; BCX53
80 V, 1 A PNP medium power transistors
10
3
Z
th(j-a)
(K/W)
10
2
duty cycle =
1
0.5
0.2
0.1
0.05
0.02
0.01
1
0
0.75
0.33
006aaa224
10
10
−1
10
−5
10
−4
10
−3
10
−2
10
−1
1
10
10
2
t
p
(s)
10
3
FR4 PCB, standard footprint
Fig 7. Transient thermal impedance from junction to ambient as a function of pulse duration for SOT89;
typical values
10
3
Z
th(j-a)
(K/W)
10
2
006aaa225
duty cycle =
1
0.5
0.33
0.2
0.1
0.05
0.02
0.01
0.75
10
1
0
10
−1
10
−5
10
−4
10
−3
10
−2
10
−1
1
10
10
2
t
p
(s)
10
3
FR4 PCB, mounting pad for collector 1 cm
2
Fig 8. Transient thermal impedance from junction to ambient as a function of pulse duration for SOT89;
typical values
BC640_BCP53_BCX53_8
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 08 — 22 February 2008
8 of 15
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