Материал: MJE5850R

MJE5850 MJE5851 MJE5852

The Safe Operating Area figures shown in Figures 12 and 13 are specified for these devices under the test conditions shown.

VCE, COLLECTOR±EMITTER VOLTAGE (VOLTS)

Figure 12. Maximum Forward Bias

Safe Operating Area

Figure 13. RBSOA, Maximum Reverse Bias

Safe Operating Area

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, i.e., the transistor must not be subjected to greater dissipation than the curves indicate.

The data of Figure 12 is based on TC = 25_C; TJ(pk) is variable depending on power level. Second breakdown pulse

limits are valid for duty cycles to 10% but must be derated when TC ≥ 25_C. Second breakdown limitations do not derate the same as thermal limitations. Allowable current at the voltages shown on Figure 12 may be found at any case temperature by using the appropriate curve on Figure 15.

TJ(pk) may be calculated from the data in Figure 11. At high case temperatures, thermal limitations will reduce the power

that can be handled to values less than the limitations imposed by second breakdown.

REVERSE BIAS

For inductive loads, high voltage and high current must be sustained simultaneously during turn±off, in most cases, with the base to emitter junction reverse biased. Under these conditions the collector voltage must be held to a safe 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 condition allowable during reverse biased turn±off. This rating is verified under clamped conditions so that the device is never subjected to an avalanche mode. Figure 13 gives the RBSOA characteristics.

VBE(off), BASE±EMITTER VOLTAGE (VOLTS)

Figure 14. Peak Reverse Base Current

Figure 15. Forward Bias Power Derating

SEATING PLANE

NOTES:

1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.

2.CONTROLLING DIMENSION: INCH.

3.DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED.