SMAJ SERIES
SURFACE MOUNT
UNIDIRECTIONAL AND BIDIRECTIONAL
TRANSIENT VOLTAGE SUPPRESSORS
FEATURES
●
Rating to 200V VBR
●
For surface mounted applications
●
Reliable low cost construction utilizing molded plastic
.
REVERSE VOLTAGE
- 5.0
to
170
Volts
POWER DISSIPATION
- 400
Watts
SMA
technique
●
Plastic material has UL recognition 94V-0
●
Typical IR less than 1µA above 10V
●
Fast response time:typically less than 1.0ns for
.062(1.60)
.055(1.40)
.114(2.90)
.098(2.50)
Uni-direction,less than 5.0ns fo Bi-direction,from 0 Volts
to BV min
.181(4.60)
.157(4.00)
.012(.305)
.006(.152)
.103(2.62)
.079(2.00)
.060(1.52)
.030(0.76)
.008(.203)
.002(.051)
MECHANICAL DATA
●
Case : Molded Plastic
●
Polarity:by cathode band denotes uni-directional device
none cathode band denotes bi-directional device
●
Weight : 0.002 ounces, 0.053 grams
.208(5.28)
.188(4.80)
Dimensions in inches and(millimeters)
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Rating at 25℃ ambient temperature unless otherwise specified.
Single phase, half wave ,60Hz, resistive or inductive load.
For capacitive load, derate current by 20%
CHARACTERISTICS
Peak Power Dissipation at T
A
=25℃
TP=1ms (NOTE1,2)
Peak Forward Surge Current
8.3ms Single Half Sine-Wave
Super Imposed on Rated Load (JEDEC Method)
Steady State Power Dissipation at T
L
=75℃
Maximum Instantaneous Forward Voltage
at 35A for Unidirectional Devices Only (NOTE3)
Operating Temperature Range
Storage Temperature Range
SYMBOL
P
PK
VALUE
Minimum 400
UNIT
WATTS
I
FSM
P
M(AV)
V
F
T
J
T
STG
40
1.0
3.5
-55 to + 150
-55 to + 175
AMPS
WATTS
VOLTS
℃
℃
NOTES:1. Non-repetitive current pulse ,per Fig. 3 and derated above T
A
=25℃ per Fig. 1.
2. Thermal Resistance junction to Lead.
3. 8.3ms single half-wave duty cycle=4 pulses per minutes maximum (uni-directional units only).
~ 280 ~
RATING AND CHARACTERTIC CURVES
SMAJ SERIES
FIG.1-PULSE DERATING CURVE
60
100
75
50
10*1000 WAVEFORM
AS DEFINED BY R.E.A
FIG.2-MAXIMUM NON-REPETITIVE PEAK
FORWARD SURGE CURRENT
PEAK FORWARD SURGE CURRENT,
AMPERES
PEAK PULSE DERATING IN % OF
PEAK POWER OR CURRENT
50
40
30
20
10
0
SINGLE SINE-WAVE
JEDEC METHOD
25
0
0
25
50
75
100
125
150
175
200
T
A
AMBIENT TEMPERATURE,℃
1
2
5
10
20
50
100
NUMBER OF CYCLES AT 60Hz
FIG.3-PULSE WAVEFORM
FIG.4-TYPICAL JUNCTION CAPACITANCE
IP
，
PEAK PULSE CURRENT
， （
%
）
T
R
=10us
Half value =
I
RSM
2
Pulse with (Tp) is defined
as that point where the
peak current decays to
50% of I
RSM
CAPACITANCE
，（
P
F
）
100
Peak value(I
RSM
)
10000
1000
Uni-directional
T
J
=25℃
50
T
J
=
25°C
10*1000waveform as
defined by R.E.A
100
Bi-directional
TP
10
1
4
10
100
1000
0
0
1.0
2.0
T, TIME (ms)
3.0
4.0
STAND-OFF VOLTAGE,VOLTS
100
P
M
(
AV
), STEADY STATE POWER DISSIPATION (W)
FIG.5-PULSE RATING CURVE
FIG.6-STEADY STATE POWER
DERATING CURVE
1.0
0.8
0.6
0.4
0.2
0.0
0
25
50
75
100
125
150
175
200
60Hz RESISTIVE OR
INDUCTIVE LOAD
P
P
, PEAK POWER (
K
w)
10
1.0
T
A
=25℃
NON-REPETIVE PULSE WAVE
FORM SHOWN IN FIG.3
0.1
0.1us
1.0us
10us
100us
1.0ms
10ms
TP, PULSE WIDTH
TL, LEAD TEMPERATURE
~ 281 ~
嵌入式系统
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