SMAJ*** Series
SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR
VOLTAGE 5.0 TO 250 Volts
400 Watt Peak Pulse Power
FEATURES
* Plastic package has Underwriters Laboratory
Flammability Classification 94V-O
* For surface mounted applications in order to optimize
board space
* Low profile package
* Built-in strain relief
* Glass passivated junction
* Low inductance
* Excellent clamping capability
* Repetition Rate (duty cycle):0.01%
* Fast response time: typically less than 1.0ps
from 0 Volts to V(BR) for unidirectional types
* Typical IR less than 1mA above 10V
* High temperature soldering guaranteed:
260°C/10 seconds,
MECHANICAL DATA
Case:
JEDEC DO-214AC molded plastic
Terminals:
Axial leads, solderable per
MIL-STD-202, Method 208
Polarity:
Color band denoted cathode except Bipolar
Mounting Position:
Any
Weight:
0.0023 ounce, 0.065 gram
We declare that the material of product compliance
with ROHS requirements
1.DEVICES FOR BIPOLAR APPLICATIONS
For Bidirectional use C or CA Suffix for types SMAJ5.0CA thru types SMAJ250CA
Electrical characteristics apply in both directions.marking like Uni; without color band.
MAXIMUM RATINGS AND CHARACTERISTICS
Ratings at 25°C ambient temperature unless otherwise specified.
Single phase, half wave, 60Hz, resistive or inductive load.
For capacitive load, derate current by 20%.
RATING
Peak Power Dissipation at T
A
=25°C, T
P
=1ms(Note 1)
Steady State Power Dissipation at T
L
=75°C(Note 2)
Peak Forward Surge Current, 8.3ms Single Half Sine-
Wave Superimposed on Rated Load(JECED Method) (Note 3)
Operating Temperature Range
SYMBOL
P
PPM
P
M(AV)
I
FSM
T
J
,
VALUE
Minimum 400
1.0
UNITS
Watts
Watts
30
-55 to +150
-55 to +175
Amps
°C
°C
Storage Temperature Range
T
STG
NOTES:
1. Non-repetitive current pulse, per Fig. 3 and derated above TA=25°C per Fig. 2.
2. Mounted on Copper Leaf area of 1.57in2(40mm2).
3. 8.3ms single half sine-wave, duty cycle= 4 pulses per minutes maximum.
SMAJ*** Series
2.Ratings and Characteristic Curves
( TA = 25°C unless otherwise noted )
Fig. 1-Peak Pulse Power Rating Curve
Non-Repetive
Pulse Waveform
Shown in Fig.3
TA=25°C
Peak Pulse Power(P
PP
) or current(I
PP
)
Derating in percentage %
100
P
PPM
, Peak Pulse Power,KW
125
100
Fig. 2-Pulse Derating Curve
10
SMAJ5.0~78
1.0
SMAJ85A~170
50
0.1
0.1
0
0
25
50 100 125 150 175 200
TA,Ambient Temperature,°C
Fig. 4-Typical Junction Capacitance
Unidirectional
10000
TJ = 25°C
f = 1.0 MHz
Vsig = 50mVp-p
1.0
10
100
td,Pulse Width,μsec
Fig. 3-Pulse Waveform
1000
10000
150
TA=25℃
Test Waveform
tf=10μs td=1000μs
I
PPM
, Peak Pulse Current %
Cj, Capacitance,pF
tf=10μs
100
Peak Value
Ippm
10/1000μs Waveform
as deffused by R.E.A
1000
meansured at
stand-off voltage
V
WM
Uni-Directional
Bi-Directional
50
Half Value
Ipp/2=td
100
0
0
1.0
2.0
t,Time,ms
3.0
10
1.0
10
100
1000
V
(WM),
Reverse Stand-off Voltage,Voltage
Fig. 6-Maximum Non-Repetitive Peak
Forward Surge Current Uniderictional
Transient thermal impedance(°C/W)
100
Fig 5.
–typical
transient thermal
impedance
I
FSM
, Forward Surge Current,Amperes
100
10
TJ = TJ max
8.3ms Single Half Sine-wave
(JEDEC Method)
1.0
0.1
0.01
0.1
1.0
10
t,Pulse duration,sec
100
10
1
10
Number of Cycles At 60 Hz
100
PCB Design
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