creat by art
Low profile package
Built-in strain relief
Glass passivated junction
Excellent clamping capability
Typical IR less than 1uA above 10V
XX = Specific Device Code
G = Green Compound
Y = Year
M = Work Month
Maximum Ratings and Electrical Characteristics
Rating at 25 ℃ ambient temperature unless otherwise specified.
Symbol Unit
PPK Watts
PDWatts
TJ, TSTG ℃
Packaging: 12mm tape per EIA Std RS-481
Mechanical Data
Terminals: Pure tin plated, lead free
Case: Molded plastic
Weight: 0.064 gram
Type Number
Operating and Storage Temperature Range
Peak Power Dissipation at TA=25℃, Tp=1ms(Note 1)
Version:B12
Features
Polarity: Indicated by cathode band
Steady State Power Dissipation
400 watts peak pulse power capability with a 10 /
1000 us waveform (300W above 78V)
Green compound with suffix "G" on packing
code & prefix "G" on datecode
For surface mounted application
Fast response time: Typically less than 1.0ps from
0 volt to BV min
High temperature soldering guaranteed:
260℃ / 10 seconds at terminals
Plastic material used carried Underwriters
Laboratory Flammability Classification 94V-0
Value
Volts
400
Amps
1
SMAJ HV SERIES
400 Watts Suface Mount Transient Voltage Suppressor
Marking Diagram
SMA/DO-214AC
Dimensions in inches and (millimeters)
-55 to +150
Peak Forward Surge Current, 8.3ms Single Half
Sine-wave Superimposed on Rated Load
(JEDEC method) IFSM
Note 1: Non-repetitive Current Pulse Per Fig. 3 and Derated above TA=25℃ Per Fig. 2
40
Maximum Instantaneous Forward Voltage at 25.0A for
Unidirectional Only VF3.5
Pb
RoHS
COMPLIANCE
RoHS
COMPLIANCE
Version:B12
RATINGS AND CHARACTERISTIC CURVES (SMAJ HV SERIES)
FIG.2 PULSE DERATING CURVE
0
25
50
75
100
125
0 25 50 75 100 125 150 175 200
TA, AMBIENT TEMPERATURE (oC)
PEAK PULSE POWER(PPP) OR CURRENT (IPP) A
DERATING IN PERCENTAGE (%)
FIG. 4 MAXIMUM NON-REPETITIVE FORWARD SURGE
CURRENT UNIDIRECTIONAL ONLY
0
10
20
30
40
50
1 10 100
NUMBER OF CYCLES AT 60 Hz
IFSM, PEAK FORWARD SURGE A
CURRENT (A)
8.3mS Single Half Sine Wave
JEDEC Method
FIG. 3 CLAMPING POWER PULSE WAVEFORM
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3 3.5 4
t, TIME ms
PEAK PULSE CURRENT (%)
td
Peak Value
IPPM
tr=10usec
Half Value-IPPM/2
10/1000usec, WAVEFORM
as DEFINED by R.E.A.
PULSE WIDTH(td) is DEFINED
as the POINT WHERE the PEAK
CURRENT DECAYS to 50% OF IPPM
FIG. 5 TYPICAL JUNCTION CAPACITANCE
10
100
1000
10000
1 10 100
V(BR), BREAKDOWN VOLTAGE (V)
CJ, JUNCTIO N CAPACITANCE (pF) A
TA=25℃
f=1.0MHz
Vsig=50mVp-p
MEASURED AT
ZERO BIAS
MEASURED at
STAND-OFF
VOLTAGE,Vwm
FIG. 1 PEAK PULSE POWER RATING CURVE
0.1
1
10
100
0.1 1 10 100 1000 10000
tp, PULSE WIDTH, (uS)
PPPM, PEAK PULSE POWER, KW
NON-REPETITIVE
PULSE WAVEFORM
SHOWN in FIG.3
TA = 25℃
Test Maximum
Current Reverse Leakage
IT @ VWM
Min Max (mA) ID (uA)
SMAJ200A SV 200 224 247 1 324 1.2 1
SMAJ220A SX 220 246 272 1 356 1.1 1
SMAJ250A SZ 250 279 309 1 405 1.0 1
SMAJ300A TE 300 335 371 1 486 0.8 1
SMAJ350A TG 350 391 432 1 567 0.7 1
SMAJ400A TK 400 447 494 1 648 0.6 1
Notes:
1. Non-repetitive current pulse, per Fig. 3 and derated above T A=25℃ per Fig. 2
2. Measure on 8.3ms single half sine-wave duty cycle=4 pulses per minutes maximum
3. Peak pulse power waveform is 10/1000 us
Version:B12
Maximum
Clamping
Voltage at IPPM
Vc(V)
(Note5)
Maximum
Peak Pulse
Surge Current
IPPM
(A)(Note5)
ELECTRICAL CHARACTERISTICS (TA=25℃ unless otherwise noted)
Device Device
Marking
Code
Breakdown Voltage
VBR (V)
at IT
Working
Peak
Reverse
Voltage
VWM
TVS APPLICATION NOTES:
Version : B12
Any combination of this three, or any one of these applivations, will prevent damage to the load. This would
require varying trade-offs in power supply protection versus maintenance(changing the time fuse).
An additional method is to utilize the Trans
RECOMMENDED PAD SIZES
The pad dimensions should be 0.010"(0.25mm) longer than the contact size, in the lead axis.
This allows a solder filler to form, see figure below. Contact factort for soldering methods.
Transient Voltage Suppressors may be used at various points in a circuit to provide various degrees of
protection. The following is a typical linear power supply with transient voltage suppressor units plaved at
different points. All provide protection
Transient Voltage Suppressor 1 provides maximum protection. However, the system will probably require
replacement of the line fuse(F) since it provides a dominant portion of the series impedance when a surge is
encountered.
Hower, we do not recommend to use the TVS diode here, unless we can know the electric circuit
impedance and the magnitude of surge rushed into the circuit. Otherwise the TVS diode is easy to be
destroyed by voltage surge.
Transient Voltage Suppressor 2 provides execllent protection of circuitry excluding the transformer(T).
However, since the transformer is a large part of the series impedance, the chance of the line fuse opening
during the surge condition is reduced.
Transient Voltage Suppressor 3 provides the load with complete protection. It uses a unidirectional
Transient Voltage Suppressor, which is a cost advantage. The series impedance now includes the line fuse,
transformer, and bridge rectifier(B) so failure
