MBRM140D datasheet(4/8 Pages) ONSEMI

Part #	MBRM140D

Description	Surface Mount Schottky Power Rectifier

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MBRM140

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4

Ipk/Io = 5

Figure 5. Current Derating

Figure 6. Forward Power Dissipation

TL, LEAD TEMPERATURE (°C)

IO, AVERAGE FORWARD CURRENT (AMPS)

0.2

0

1.0

0.6

0.5

0.3

0.1

0

1.0

0.4

0.8

1.2

1.6

0.4

SQUARE

WAVE

dc

Ipk/Io = p

Ipk/Io = 10

Ipk/Io = 20

0.6

1.4

0.2

0.7

0.8

0.9

45

75

25

1.8

1.2

1.0

0.8

0.2

0

55

115

105

1.4

125

1.6

Ipk/Io = 20

Ipk/Io = 10

Ipk/Io = 5

Ipk/Io = p

SQUARE WAVE

dc

0.6

0.4

FREQ = 20 kHz

35

65

85

95

Figure 7. Capacitance

Figure 8. Typical Operating Temperature Derating*

30

0

VR, REVERSE VOLTAGE (VOLTS)

1000

100

10

VR, DC REVERSE VOLTAGE (VOLTS)

15

40

0

115

95

85

75

15

5.0

10

20

25

20

25

5.0

10

105

125

* Reverse power dissipation and the possibility of thermal runaway must be considered when operating this device under any re-

verse voltage conditions. Calculations of TJ therefore must include forward and reverse power effects. The allowable operating

TJ may be calculated from the equation:

TJ = TJmax - r(t)(Pf + Pr) where

r(t) = thermal impedance under given conditions,

Pf = forward power dissipation, and

Pr = reverse power dissipation

This graph displays the derated allowable TJ due to reverse bias under DC conditions only and is calculated as TJ = TJmax - r(t)Pr,

where r(t) = Rthja. For other power applications further calculations must be performed.

Rtja = 33.72°C/W

51

°C/W

83.53

°C/W

96

°C/W

TJ = 25°C

40

35

30

35

69

°C/W

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