Transient Voltage Suppression Diodes
Surface Mount – 400W > SMAJ series
Ratings and Characteristic Curves
(T =25°C unless otherwise noted)
A
10
Peak Pulse Power (P
PP
) or Current (I
PP
)
Derating in Percentage %
P
PPM
-Peak Pulse Power (kW)
100
80
60
1
40
20
0.2x0.2" (5.0x5.0mm)
Copper Pad Area
0.1
0.000001
0
0.00001
0.0001
0.001
0
25
50
75
100
125
150
175
t
d
-Pulse Width (sec.)
T
A
-Ambient temperature (ºC)
Figure 3 - Pulse Waveform
150
I
PPM
- Peak Pulse Current, % I
RSM
tr=10μsec
Peak Value
IPPM
TJ=25°C
Pulse Width(td) is defined
as the point where the peak
current decays to
50%
of IPPM
Figure 4 - Typical Junction Capacitance
10000
Bi-directional V=0V
100
1000
Uni-directional V=0V
( )
2
10/1000μsec. Waveform
as defined by R.E.A
Cj (pF)
Half Value
IPPM
IPPM
Uni-directional @VR
100
Bi-directional @VR
50
10
Tj=25ºC
f=1.0MHz
Vsig=50mVp-p
0
td
1
0
1.0
2.0
t-Time (ms)
3.0
4.0
1.0
10.0
100.0
1000.0
V
BR
- Reverse Breakdown Voltage (V)
Figure 5 - Steady State Power Dissipation Derating
Curve
P
M(AV)
, Steady State Power Dissipation (W)
1.2
Figure 6 - Maximum Non-Repetitive Forward Surge
Current Uni-Directional Only
45
I
FSM
- Peak Forward Surve Current
(A)
40
35
30
25
20
15
10
5
0
1
10
Number of Cycles at 60 Hz
100
1
0.8
0.6
0.4
0.2
0
0
25
50
75
100 125 150
T
A
- Ambient Temperature (ºC)
175
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.
9
Revision: January 09, 2009
SMAJ Series
SMAJ Series
Figure 1 - Peak Pulse Power Rating Curve
Figure 2 - Pulse Derating Curve
LITTELFUSE [ LITTELFUSE ]
