MJE13005 NPN SILICON TRANSISTOR
UNISONIC TECHNOLOGIES CO., LTD 7 of 9
www.unisonic.com.tw QW-R203-018. K
SAFE OPERATING AREA INFORMATION
FORWARD BIAS
There are two limitations on the power handling ability of a transistor: average junction temperature and second
breakdown. Safe operating area curves indicate IC-VCE limits of the transistor that must be observed for reliable
operation; e., the transistor must not be sub jected to greater dissipation than the c urves indicat e.
The data of Fig. 4 is based on TC = 25°С; T J(PK) is variable depending on power level. Second breakdown pulse
limits are valid for duty cycles to 10% but must be derated when T C≥25°С. Second breakdown limitations do not
derate the sam e as thermal lim itations. Allo wable current at the voltages sho wn on Fig. 4 ma y be found at any cas e
temperature by using the appropriate curve on Fig. 6.
TJ(PK) may be calculated from the data in Fig. 10. At high case temperatures, thermal limitations will reduce the
power that can be handled to values less than the li m i tations impos ed by second breakdown.
REVERSE BIAS
For inductive l oads , high v o lta ge and h igh cu rr ent m ust be s ust ain ed simultaneously d urin g tur n-off , i n most cas es,
with the base t o emitter j unction reverse biased. Under th ese conditio ns the collector voltage must be held to a saf e
level at or below a specific value of collector current. This can be accomplished by several means such as active
clamping, RC snubbing, load line shaping, etc. The safe level for these devices is specified as Reverse Bias Safe
Operating Area and represents the voltage-current conditions during reverse biased turn-off. This rating is verified
under clamped conditions so that the dev ice is never subjec ted to an avalanche mo de. Figure 5 gives the c omplete
RBSOA characteristics.