BC858 datasheet(6/8 Pages) FS

6 / 8 page

t, TIME (ms)

Figure 13. Thermal Response

VCE , COLLECTOR–EMITTER VOLTAGE (V)

Figure 14. Active Region Safe Operating Area

BONDING WIRE LIMIT

THERMAL LIMIT

SECOND BREAKDOWN LIMIT

The safe operating area curves indicate IC –VCE limits of the

transistor that must be observed for reliable operation. Collector

load lines for specific circuits must fall below the limits indicated by

the applicable curve.

The data of Figure 14 is based upon TJ(pk) = 150 C; TC or TE

is variable depending upon conditions. Pulse curves are valid for

duty cycles to 10% provided TJ(pk) < 150 C. TJ(pk) may be calcu-

lated from the data in Figure 13. At high case or ambient

temperatures, thermal limitations will reduce the power that can

be handled to values less than the limitations imposed by the sec-

ondary breakdown.

BC558

BC557

BC556

Z θJC (t) = r(t) R θJC

R θJC = 83 3°C/W MAX

Z θJA (t) = r(t) R

θJA

R θJA = 200°C/W MAX

D CURVES APPLY FOR POWER

PULSE TRAIN SHOWN

READ TIME AT t

T J(pk) – T C = P (pk) R θJC (t)

DUTY CYCLE, D = t 1 /t 2

P(pk)

SINGLE PULSE

TA= 25 C

TJ= 25 C

3 ms

1.0

0.7

0.5

0.3

0.2

0.1

0.07

0.05

0.03

0.02

0.01

D=0.5

0.2

0.1

0.05

0.1

0.2

0.5

1.0

2.0

5.0

100

200

500

1.0k 2.0k

5.0k

10k

–1.0

–0.5

–10

–30 –45 –65 –100

–200

–100

–50

–10

–5.0

–2.0

2007. 12. 18

6/7

Revision No : 0

BC856 / 857 / 858 / 859S

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