MBRM120LT3 Datasheet, PDF (3/4 Pages) Motorola, Inc – SCHOTTKY BARRIER RECTIFIER 1.0 AMPERES 20 VOLTS

1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
25
dc
FREQ = 20 kHz
SQUARE WAVE
Ipk/Io = p
Ipk/Io = 5
Ipk/Io = 10
Ipk/Io = 20
45
65
85 105 125 145 165
TL, LEAD TEMPERATURE (°C)
Figure 5. Current Derating
MBRM120LT3
0.7
0.6
0.5
Ipk/Io = 5
Ipk/Io = p
SQUARE
WAVE
dc
Ipk/Io = 10
0.4
Ipk/Io = 20
0.3
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IO, AVERAGE FORWARD CURRENT (AMPS)
Figure 6. Forward Power Dissipation
1000
150
145
Rtja = 33.72°C/W
TJ = 25°C
140
51°C/W
135
69°C/W
100
130
83.53°C/W
96°C/W
125
120
10
0 2.0 4.0 6.0 8.0 10 12 14 16 18 20
VR, REVERSE VOLTAGE (VOLTS)
Figure 7. Capacitance
115
0 2.0 4.0 6.0 8.0 10 12 14 16 18 20
VR, DC REVERSE VOLTAGE (VOLTS)
Figure 8. Typical Operating Temperature Derating*
* 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.
1.0
50%
20%
0.1 _10%
5.0%
0.01 ^2.0%
1.0%
Rtjl(t) = Rtjl*r(t)
0.001
0.00001
0.0001
0.001
0.01
0.1
1.0
10
100
T, TIME (s)
Figure 9. Thermal Response Junction to Lead
Rectifier Device Data
3