Fzt1147a, Thermal characteristics, Transient thermal resistance – Diodes FZT1147A User Manual
Page 4: Derating curve

FZT1147A
SPICE PARAMETERS
* ZETEX FZT1147A Spice model Last revision 10/12/96
*
.MODEL
FZT1147A PNP IS=1.272e-12 NF=0.989 ISE=2.5e-13 NE=1.65
+
BF=500 VAF=14.59 IKF=8 NR=1 ISC=8e-14 NC= 1.6
+
BR=90 VAR=3.1 IKR=1.2 RE=15e-3 RB=145e-3
+
RC=13e-3 CJE=560e-12
+
CJC=255e-12 VJC=0.6288
+
MJC=0.4048 TF=1.2e-9 TR=13e-9
*
1995 ZETEX PLC
The copyright in this model and the design embodied belong to Zetex PLC (“Zetex”). It is supplied
free of charge by Zetex for the purpose of research and design and may be used or copied intact
(including this notice) for that purpose only. All other rights are reserved. The model is believed
accurate but no condition or warranty as to its merchantability or fitness for purpose is given and
no liability in respect of any use is accepted by Zetex PLC, its distributors or agents.
100µs
Pulse Width
Transient Thermal Resistance
0
Therm
al Resistance
(°C
/W)
D=0.2
D=0.1
D=0.05
D=0.5
Single Pulse
D=t1
tP
t1
tP
1ms
10ms 100ms
1s
10s
100s
Derating curve
Max
Pow
er Dissip
ation
- (W
atts)
0
0
T - Ambient Temperature (°C)
D = 1
10
20
30
40
50
20
40
60
80
100
120
140
160
1
2
3
4
THERMAL CHARACTERISTICS