SMAJ5.0 thru 188CA
Ratings and
Characteristic Curves
(T
100
Surface Mount T
RANS
Z
ORB
®
Transient Voltage Suppressors
= 25°C unless otherwise noted)
A
Fig. 1 – Peak Pulse Power Rating Curve
Peak Pulse Power (P
PP
) or Current (I
PPM
)
Derating in Percentage, %
100
Fig. 2 – Pulse Derating Curve
P
PPM
— Peak Pulse Power (kW)
Non-repetitive Pulse
Waveform shown in Fig. 3
T
A
= 25°C
10
75
SMAJ85 --
SMAJ188
1
SMAJ5.0 --
SMAJ78
50
25
0.2 x 0.2" (5.0 x 5.0mm)
Copper Pad Areas
0
0
25
50
75
100
125
150
175
200
0.2 x 0.2" (5.0 x 5.0mm)
Copper Pad Areas
0.1
0.1µs
1.0µs
10µs
100µs
1.0ms
10ms
t
d
— Pulse Width (sec.)
T
A
— Ambient Temperature (°C)
Fig. 3 – Pulse Waveform
150
10,000
Fig. 4 – Typical Junction Capacitance
C
J
— Junction Capacitance (pF)
T
J
= 25°C
f = 1.0MHz
Vsig = 50mVp-p
1,000
Measured at
Stand-Off
Voltage, V
WM
Uni-Directional
I
PPM
— Peak Pulse Current, % I
RSM
tr = 10µsec.
Peak Value
I
PPM
100
T
J
= 25°C
Pulse Width (td)
is defined as the point
where the peak current
decays to 50% of I
PPM
Half Value — IPP
2
I
PPM
50
10/1000µsec. Waveform
as defined by R.E.A.
100
Bi-Directional
td
0
10
0
1.0
2.0
3.0
4.0
1
10
100
200
t — Time (ms)
V
WM
— Reverse Stand-off Voltage (V)
Fig. 5 – Typical Transient Thermal
Impedance
I
FSM
— Peak Forward Surge Current (A)
1000
200
Fig. 6 - Maximum Non-Repetitive Forward
Surge Current Uni-Directional Only
T
J
= T
J
max.
8.3ms Single Half Sine-Wave
(JEDEC Method)
Transient Thermal Impedance (°C/W)
100
100
50
10
1
0.001
10
1
5
10
50
100
0.01
0.1
1
10
100
1000
t
p
— Pulse Duration (sec)
Number of Cycles at 60 Hz
VISHAY [ VISHAY TELEFUNKEN ]
