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SMAJ78 Datasheet

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

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SEMICONDUCTOR
SMAJ SERIES
SURFACE MOUNT
UNIDIRECTIONAL AND BIDIRECTIONAL
TRANSIENT VOLTAGE SUPPRESSORS
STAND-OFF VOLTAGE - 5.0 to 170 Volts
POWER DISSIPATION - 400 WATTS
FEATURES
Rating to 200V VBR
For surface mounted applications
Reliable low cost construction utilizing molded plastic
technique
Plastic material has UL flammability classification 94V-O
Typical IR less than 1uA above 10V
Fast response time: typically less than 1.0ns for
Uni-direction,less than 5.0ns for Bi-direction,form 0 Volts
to BV min
MECHANICAL DATA
Case : Molded plastic
Polarity : by cathode band denotes uni-directional device
none cathode band denotes bi-directional device
Weight : 0.002 ounces, 0.064 gram
SMA
SMA
A DIM. MIN. MAX.
A 4.06 4.57
B 2.29 2.92
BC
C 1.27 1.63
D 0.15 0.31
E 4.83 5.59
G
H FD
E
F 0.05 0.20
G 2.01 2.62
H 0.76 1.52
All Dimensions in millimeter
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25ambient temperature unless otherwise specified.
Single phase, half wave, 60Hz, resistive or inductive load.
For capacitive load, derate current by 20%
CHARACTERISTICS
SYMBOLS
PEAK POWER DISSIPATION AT TA = 25 C,
TP = 1ms (Note 1,2)
Peak Forward Surge Current 8.3ms
single half sine-wave super imposed
on rated load (Note 3)
(JEDEC METHOD)
PPK
IFSM
Steady State Power Dissipation at TL =75 C
PM(AV)
Maximum Instantaneous forward voltage
at 35A for unidirectional devices only
VF
VALUE
Minimum 400
40
1.0
3.5
UNIT
WATTS
AMPS.
WATTS
Volts
Operating Temperature Range
TJ
-55 to +150
C
Storage Temperature Range
TSTG
-55 to +175
C
NOTES : 1. Non-repetitive current pulse, per fig. 3 and derated above TA= 25 per fig.1.
REV. 4, 12-Jan-2004, KSIA02
2. Thermal Resistance junction to Lead
3. 8.3ms single half-sine wave duty cycle= 4 pulses maximum per minute (unidirectional units only).



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SMAJ78 Datasheet

SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS

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SMAJ78 pdf
RATING AND CHARACTERISTIC CURVES
SMAJ SERIES
FIG.1 - PULSE DERATING CURVE
100
75
50
25
10 X 1000 WAVEFORM AS
DEFINED BY R.E.A.
0
0 25 50 75 100 125 150 175 200
AMBIENT TEMPERATURE, C
FIG.2 - MAXIMUM NON-REPETITIVE SURGE CURRENT
60
50
40
30
20
10
Pulse Width 8.3ms
Single Half-Sine-Wave
(JEDEC METHOD)
0
12
5 10 20
50
NUMBER OF CYCLES AT 60Hz
100
FIG.3 - PULSE WAVEFORM
TR=10us
Peak value (IRSM)
100
Half value= IRSM
2
Pulse width (TP) is defined
as that point where the
peak current decays to
50% of IRSM
50 10 x 1000 waveform as
TJ=25 C
defined by R.E.A.
TP
0
0 1.0 2.0 3.0 4.0
T , TIME ( ms )
10000
FIG.4 - TYPICAL JUNCTION CAPACITANCE
1000
Bi-directional
100
Uni-directional
TJ = 25 C
10
1
10 100 1000
STAND-OFF VOLTAGE, VOLTS
FIG.5 - PULSE RATING CURVE
100
TA=25 C
NON-REPETITIVE
PULSE WAVEFORM
10 SHOWN IN FIG 3.
FIG.6 - STEADY STATE POWER DERATING CURVE
1.0
0.8
0.6
1.0
5.0mm LEAD AREAS
0.1
0.1us
1.0us
10us
100us
TP, PULSE WIDTH
1.0ms
10ms
0.4
0.2
0.0
0
60Hz RESISTIVE OR
INDUCTIVE LOAD
25 50
75 100 125 150 175 200
TL, LEAD TEMPERATURE
REV. 4, 12-Jan-2004, KSIA02


Part Number SMAJ78
Description SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS
Maker LITE-ON
Total Page 4 Pages
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