TYPE
CITATION
SUBJECT
SMV1812A
□□□
KRR
Structure
MODEL
DATE
REV.
PAGE
1/9
Feb. 13, 2009
C01
1. STRUCTURE
NO.
1.1
1.2
1.3
1.4
1.5
1.6
1.7
ITEM
Main Material
End termination
Packaging
Complies with
Standard
Zinc Oxide
Ag/Ni/Sn
Reel
IEC61000-4-5
DESCRIPTION
Complies with RoHS
Yes
Standard
Lead content
< 1000ppm
Reflow solder profile
250
℃
temperature
(Recommend)
L
W
T(max.)
4.50 ± 0.20
3.20 ± 0.20
2.00
0.5+ 0.2/-0.1
1.8
Dimensions
a
TYPE
CITATION
SUBJECT
SMV1812A
□□□
KRR
Electrical Characteristics
MODEL
DATE
REV.
PAGE
2/9
Feb. 13, 2009
C01
2. ELECTRICAL CHARACTERISTICS
N0.
2.0
ITEM
Standard
Conditions
Maximum
Allowable Voltage
Varistor Voltage
Varistor Voltage
Temperature
Coefficient
Max. Clamping
Voltage
AC :
*(1)
V
rms
DC :
*(1)
V
V
0.1mA
:
*(1)
V
0 ~
−0.05
%/°C
*(1)
V at
1
A
Peak voltage across the varistor with a specified
peak impulse current of 8x20μs waveform.
The max. current within the varistor voltage
change of less than
±10%
when one impulse
current (8x20μs) applied.
The max. energy absorbed with a varistor voltage
change of less than
±10%
when one impulse
(10x1000μs) is applied.
at V1mA×80%
at V1mA×80% (After Reliability Test)
Capacitance shall be measured at 1 kHz±10%,1
Vrms max.(1 MHz below 100 pF) 0V bias and
20±2℃
PERFORMANCE
2.1
2.2
2.3
2.4
TEST METHODS
Unless otherwise specified, all tests are made
under environmental conditions as given below:
Temperature:
5~35°C
Relative humidity:
45~85 % RH
Maximum continuous sine wave(RMS) or DC
voltage which may be applied.
Voltage across the varistor measured at C
mA
DC.
Withstanding Surge
2.5
Current
*(1)
A
2.6
2.7
2.8
2.9
Energy
Response time
Leakage current
Capacitance
*(1)
Joule
T
rise
< 1 nS
I
Vv
I
Vv
<50μΑ
<200μA
*(1)
pF.
*(1) See table 2.1 Electrical Characteristics
TYPE
CITATION
SUBJECT
SMV1812A
□□□
KRR
Electrical Characteristics
MODEL
DATE
REV.
PAGE
3/9
Feb. 13, 2009
C01
Table 2.1 Electrical Characteristics
Maximum
Part
Varistor
Allowable
Number
Voltage
Voltage
Symbol
1812A240KRR
1812A390KRR
1812A470KRR
1812A560KRR
AC
14
25
30
35
DC
18
30
38
45
V（1mA）
24( 21.6~26.4 )
39 (35.1~42.9 )
47(42.3~51.7 )
56( 50.4~61.6 )
Max.
Clamping
Voltage
V
(
＊
2)
＜38
＜65
＜77
＜90
Withstanding
Energy Capacitance
Surge Current
A
(
＊
3)
800
800
800
800
J
＞2.3
＞3.7
＞4.2
＞4.2
PF
(
＊
1)
(kHz)
3500
2350
1600
1200
TYPE
CITATION
SUBJECT
SMV1812A
□□□
KRR
Reliability
MODEL
DATE
REV.
PAGE
4/9
Feb. 13, 2009
C01
3. ENVIRONMENTAL CHARACTERISTICS
No.
3.1
Characteristic
High Temperature
Storage
Test method and description
The specimen shall be subjected to 150 ± 2℃ for 1000 ± 12 hours in a thermostatic bath
without load and then stored at room temperature and humidity for 1 to 2 hours.
The change of varistor voltage shall be within 10﹪.
The temperature cycle of specified
temperature shall be repeated five times
and then stored at room temperature and
change of varistor voltage shall be within
10﹪and mechanical damage shall be
High Temperature
Load
Step
1
2
3
4
Temperature
-40±3℃
Room Temperature
125±2℃
Room Temperature
Period
30Min±3
1~2 hours
30Min±3
1~2 hours
3.2
Temperature Cycle humidity for one or two hours. The
After being continuously applied the maximum allowable voltage at 85 ± 2℃ For 1000± 2
hours, the specimen shall be stored at room temperature and humidity for one or two
hours, the change of varistor voltage shall be within 10﹪.
The specimen should be subjected to 40 ± 2℃, 90 to 95%RH environment, and the
3.3
3.4
Damp Heat Load/
Humidity Load
maximum allowable voltage applied for 1000 hours, then stored at room temperature
and humidity for one or two hours. The change of varistor voltage shall be within 10%.
The specimen should be subjected to -40 ± 2℃, without load for 500 hours and then
3.5
Low Temperature
Storage
stored at room temperature for one or two hours. The change of varistor voltage shall be
within 10﹪
4. TECHNICAL TERM
No.
4.1
4.2
4.3
Item
Operating Temperature
Range
Storage Temperature
Range
Transient Response
Time
Specifications
-40℃ to +85℃
-40℃ to +125℃
< 50 ns
Description
Operating temperature range without derating.
Storage temperature range without voltage applied.
Time lag between application of surge and varistor's
"turn-on" conduction action.
TYPE
CITATION
SUBJECT
SMV1812A
□□□
KRR
Soldering
MODEL
DATE
REV.
PAGE
5/9
Feb. 13, 2009
C01
5. SOLDERING RECOMMENDATIONS
5.1 Recommended solder pad layout
A
B
C
D
2.5~3.3
5.5~6.7
2.8~3.6
1.3~2.2
（Unit：mm）
5.2 The SIR test of the solder paste shall be done（Based on JIS-Z-3284）
5.3 Steel plate and foot distance printing
Foot distance printing (mm)
> 0.65mm
0.65mm~0.5mm
0.50mm~0.40mm
<=0.40 mm
Steel Plate thickness (mm)
0.18mm
0.15mm
0.12mm
0.10mm
5.4 IR Soldering
Rapid heating, partial heating or rapid cooling will easily cause defect of the component. So preheating and
gradual cooling process is suggested. IR soldering has the highest yields due to controlled heating rates and
solder liquids times. Make sure that the element is not 2.4 The IR reflow and temperature of Soldering for Pb
Free subjected to a thermal gradient steeper than 4 degrees per second. 2 degrees per second is the ideal
gradient. During the soldering process, pre- heating to within 100 degrees of the solders peak temperature is
essential to minimize thermal shock.
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