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78253 Series
MAX253 Compatible Converter Transformers
TYPICAL CHARACTERISTICS (VOLTAGE CURVES) continued
VOLTAGE DEVIATION
110
105
100
95
78253/35(M)C
110
105
100
95
78253/55(M)C
90
-50
-25
0
25
50
75
100
90
-50
-25
0
25
50
75
100
Temperature (°C)
Temperature (°C)
110
105
100
95
78253/35(M)VC
110
105
100
95
78253/55(M)VC
90
-50
-25
0 25 50
Temperature (°C)
75
100
90
-50
-25
0 25 50
Temperature (°C)
75
100
TECHNICAL NOTES
SOLDERING INFORMATION 1
0.51
(12.95)
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Volt-
age’, ‘Proof Voltage’, ‘Dielectric Withstand
Voltage’ & ‘Isolation Test Voltage’ are all terms
that relate to the same thing, a test voltage,
applied for a specified time, across a compo-
nent designed to provide electrical isolation, to
verify the integrity of that isolation.
All products in this series are 100% production
tested at their stated isolation voltage.
A question commonly asked is, “What is the
continuous voltage that can be applied across
the part in normal operation?”
For a part holding no specific agency approv-
als both input and output should normally be
maintained within SELV limits i.e. less than
42.4V peak, or 60VDC. The isolation test
voltage represents a measure of immunity to
transient voltages and the part should never
be used as an element of a safety isolation
system. The part could be expected to function
correctly with several hundred volts offset
applied continuously across the isolation bar-
rier; but then the circuitry on both sides of the
barrier must be regarded as operating at an
unsafe voltage and further isolation/insulation
systems must form a barrier between these
circuits and any user-accessible circuitry ac-
cording to safety standard requirements.
REPEATED HIGH-VOLTAGE
ISOLATION TESTING
It is well known that repeated high-voltage
isolation testing of a barrier component can
actually degrade isolation capability, to a
lesser or greater degree depending on ma-
terials, construction and environment. This
series has toroidal isolation transformers,
with no additional insulation between pri-
mary and secondary windings of enameled
wire. While parts can be expected to with-
stand several times the stated test voltage,
the isolation capability does depend on the
wire insulation. Any material, including this
enamel (typically polyurethane) is suscep-
tible to eventual chemical degradation when
subject to very high applied voltages thus
implying that the number of tests should be
strictly limited. We therefore strongly advise
against repeated high voltage isolation test-
ing, but if it is absolutely required, that the
voltage be reduced by 20% from specified
test voltage.
This consideration equally applies to agency
recognized parts rated for better than
functional isolation where the wire enamel
insulation is always supplemented by a
further insulation system of physical spacing
or barriers.
Pin finish Matte tin
Peak wave solder temperature 300?C for 10 seconds
Peak reflow temperature 220?C 2
TUBE OUTLINE DIMENSIONS
0.43
(10.95)
0.16 (4.00)
0.023±0.005
(0.60±0.15)
0.22 (5.50)
0.15
(3.80)
0.62 (15.70)
Tube length: 18.3±0.08 (465±2). Tube quantity: 50.
Tube material: Antistatic coated clear pvc.
Unless otherwise stated all dimensions in inches(mm) ±0.01 (0.25).
All specifications typical at T A =25°C
1 For further information, please visit www.murata-ps.com/rohs
2 For high temperature reflow parts see 78253J series.
www.murata-ps.com/support
KMP_78253C_D04 Page 4 of 5
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相关代理商/技术参数
78253/55MV-R 制造商:Murata Power Solutions 功能描述:Pulse Transformer 1:1.33 4000VDC 0.6Ohm Prim. DCR 8pF 28Vus Surface Mount
78253/55V 功能描述:电源变压器 MAX253 CNVR XFRMR RoHS:否 制造商:Triad Magnetics 功率额定值:12 VA 初级电压额定值:115 V / 230 V 次级电压额定值:12 V / 24 V 安装风格:SMD/SMT 一次绕组:Dual Primary Winding 二次绕组:Dual Secondary Winding 长度:2.5 in 宽度:2 in 高度:1.062 in
78253/55VC 功能描述:电源变压器 MAX253 CNVR XFRMR 5Vin 5Vout 4000VDC RoHS:否 制造商:Triad Magnetics 功率额定值:12 VA 初级电压额定值:115 V / 230 V 次级电压额定值:12 V / 24 V 安装风格:SMD/SMT 一次绕组:Dual Primary Winding 二次绕组:Dual Secondary Winding 长度:2.5 in 宽度:2 in 高度:1.062 in
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7825335C 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:MAX253 Compatible Converter Transformers 3.3V and 5V versions
7825335MC 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:MAX253 Compatible Converter Transformers 3.3V and 5V versions
7825335MVC 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:MAX253 Compatible Converter Transformers 3.3V and 5V versions
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