Datasheet BC846BDW1, BC847BDW1, BC848CDW1 (ON Semiconductor) - 9

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BC846BDW1, BC847BDW1, BC848CDW1
1.0 D = 0.5 0.2 0.1 0.1 0.05 THERMAL
ZqJA(t) = r(t) RqJA
0.02
R
P
qJA = 328
5
C/W MAX
(pk)
D CURVES APPLY FOR POWER PULSE TRAIN SHOWN
ANCE (NORMALIZED)
READ TIME AT t1
0.01 t1
TJ(pk) − TC = P(pk) RqJC(t)
0.01 r(t), TRANSIENT t RESIST 2 DUTY CYCLE, D = t1/t2 SINGLE PULSE 0.001 0 1.0 10 100 1.0k 10k 100k 1.0M t, TIME (ms)
Figure 34. Thermal Response
-200 The safe operating area curves indicate IC−VCE limits 1 s 3 ms of the transistor that must be observed for reliable -100 operation. Collector load lines for specific circuits must (mA) T T fall below the limits indicated by the applicable curve. -50 A = 25°C J = 25°C The data of Figure 35 is based upon TJ(pk) = 150°C; TC or TA is variable depending upon conditions. Pulse OR CURRENT BC558 curves are valid for duty cycles to 10% provided TJ(pk) ≤ BC557 150°C. T -10 J(pk) may be calculated from the data in BC556 Figure 34. At high case or ambient temperatures, COLLECT -5.0 thermal limitations will reduce the power that can be I C BONDING WIRE LIMIT THERMAL LIMIT handled to values less than the limitations imposed by the SECOND BREAKDOWN LIMIT secondary breakdown. -2.0 -1.0 -5.0 -10 -30 -45 -65 -100 VCE, COLLECTOR-EMITTER VOLTAGE (V)
Figure 35. Active Region Safe Operating Area www.onsemi.com 9