Datasheet

MBRM140
http://onsemi.com
4
P
FO
, AVERAGE POWER DISSIPATION (WATTS)
I
O
, AVERAGE FORWARD CURRENT (AMPS)
I
pk
/I
o
= 5
Figure 5. Current Derating Figure 6. Forward Power Dissipation
T
L
, LEAD TEMPERATURE (°C) I
O
, AVERAGE FORWARD CURRENT (AMPS)
0.20
1.0
0.6
0.5
0.3
0.1
0
1.00.4 0.8 1.2 1.6
0.4
SQUARE
WAVE
dc
I
pk
/I
o
=
I
pk
/I
o
= 10
I
pk
/I
o
= 20
0.6 1.4
0.2
0.7
0.8
0.9
45 7525
1.8
1.2
1.0
0.8
0.2
0
55 115105
1.4
125
1.6
I
pk
/I
o
= 20
I
pk
/I
o
= 10
I
pk
/I
o
= 5
I
pk
/I
o
=
SQUARE WAVE
dc
0.6
0.4
FREQ = 20 kHz
35 65 85 95
T
J
, DERATED OPERATING TEMPERATURE (C)
C, CAPACITANCE (pF)
Figure 7. Capacitance Figure 8. Typical Operating Temperature Derating*
300
V
R
, REVERSE VOLTAGE (VOLTS)
1000
100
10
V
R
, DC REVERSE VOLTAGE (VOLTS)
15 400
115
95
85
75
155.0 10 20 25 20 255.0 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 T
J
therefore must include forward and reverse power effects. The allowable operating
T
J
may be calculated from the equation: T
J
= T
Jmax
- 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 T
J
due to reverse bias under DC conditions only and is calculated as T
J
= T
Jmax
- r(t)Pr,
where r(t) = Rthja. For other power applications further calculations must be performed.
R
tja
= 33.72°C/W
51°C/W
83.53°C/W
96°C/W
T
J
= 25°C
4035 30 35
69°C/W