Nexperia

BC55PA series

60 V, 1 A NPN medium power transistors

006aac685

10

1

102

103

Zth(j-a)

(K/W)

10- 1

10- 5

10

10- 2

10- 4

102

10- 1

tp (s)

10- 3

103

1

0

duty cycle = 1

0.01

0.05

0.1

0.2

0.33

0.5

0.75

0.02

0.25

FR4 PCB, single-sided copper, tin-plated; mounting pad for collector 6 cm2

Fig. 4. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values

006aac686

10

1

102

103

Zth(j-a)

(K/W)

10- 1

10- 5

10

10- 2

10- 4

102

10- 1

tp (s)

10- 3

103

1

0

duty cycle = 1

0.01

0.05

0.1

0.2

0.33

0.5

0.75

0.02

0.25

FR4 PCB, 4-layer copper, standard footprint

Fig. 5. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values

006aac687

10

1

102

103

Zth(j-a)

(K/W)

10- 1

10- 5

10

10- 2

10- 4

102

10- 1

tp (s)

10- 3

103

1

0

duty cycle = 1

0.01

0.05

0.1

0.2

0.33

0.5

0.75

0.02

0.25

FR4 PCB, 4-layer copper, mounting pad for collector 1 cm2.

Fig. 6. Transient thermal impedance from junction to ambient as a function of pulse duration; typical values

BC55PA_SER

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Product data sheet

Rev. 9 — 1 July 2022

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