MURATA KMP_78250

78250 Series
MAX250 Compatible Converter Transformers
CHARACTERISTICS 78250C/78250MC
Parameter
Conditions
Min.
Typ.
Max.
Units
Primary Inductance, LP
Leakage Inductance, LL
Interwinding Capacitance, CWW
Primary D.C. Resistance, RDC
Volt-time Product, Et
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
Pins1/2 or 2/3
1.0
2.0
2.0
69
1.0
2.5
3.0
90
2.0
mH
μH
pF
Ω
50
Vμs
FEATURES
CHARACTERISTICS 78250VC/78250MVC
RoHS compliant
Parameter
Conditions
Min.
Typ.
Max.
Units
Primary Inductance, LP
Leakage Inductance, LL
Interwinding Capacitance, CWW
Primary D.C. Resistance, RDC
Volt-time Product, Et
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
Pins1/2 or 2/3
1.0
2.0
35
9
1.4
2.5
40
12
1.8
mH
μH
pF
Maxim MAX250 compatible
Isolation to 4kVrms
Industry-standard pinout
Ω
50
Vμs
Surface mount option
UL 94 V-0 package materials
Low profile
Toroidal construction
Fully encapsulated
Industrial temperature range
DESCRIPTION
The 78250 series of converter transformers
are specifically designed for use with Maxim
chipsets to provide isolated RS232 interfaces.
Carefully controlled turns ratios ensure consistent
performance whilst a toroidal construction
minimises EMI.
ORDER CODE DETAILS
Order Code
78250C / 78250VC
78250MC / 78250MVC
78250MC-R / 78250MVC-R
Package Type
6 Pin DIL
6 Pin SM
6 Pin SM
Operating free air temperature range
Storage temperature range
Lead temperature 1.5mm from case for 10 seconds
Peak current, IPK
Isolation voltage 78250(M)C (flash tested for 1 second)
Isolation voltage 78250V(M)C (flash tested for 1 second)
www.murata-ps.com
-40°C to 85°C
-50°C to 125°C
300°C
300mA
1.5kVrms
4.0kVrms
All specifications typical at TA=25°C
TECHNICAL NOTES
ISOLATION VOLTAGE
REPEATED HIGH-VOLTAGE ISOLATION TESTING
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘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 component designed
to provide electrical isolation, to verify the integrity of that
isolation.
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 materials, construction and environment. This series has toroidal isolation transformers,
with no additional insulation between primary and
secondary windings of enameled wire. While parts
can be expected to withstand several times the
stated test voltage, the isolation capability does depend on the wire insulation. Any material, including
this enamel (typically polyurethane) is susceptible
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 testing, but if it is absolutely required, that
the voltage be reduced by 20% from specified test
voltage.
A question commonly asked is, “What is the continuous
voltage that can be applied across the part in normal operation?”
For full details go to
www.murata-ps.com/rohs
Quantity
50
50
500
ABSOLUTE MAXIMUM RATINGS
All products in this series are 100% production tested at
their stated isolation voltage.
Packaging Type
Tube
Tube
Tape & Reel
For a part holding no specific agency approvals 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 barrier; 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 according to safety standard requirements.
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.
Technical enquiries - email: [email protected], tel: +44 (0)1908 615232
KMP_78250C_C02 Page 1 of 3
78250 Series
MAX250 Compatible Converter Transformers
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
6 Pin SM
6 Pin DIL
0.5
(12.70)
0.375
(9.52) Max.
0.375
(9.52) MAX
1
0.354
(9.0) Max.
78250C
XYYWW
Primary
Secondary
6
1
0.354
(9.0) Max.
2
3
4
78250MC
XYYWW
0.25
(6.35)
Primary
Secondary
6
2
5*
3
4
0.25
(6.35)
0.012±0.30
(0.008±0.20)
0.135±0.02
(3.44±0.50)
0.012(0.30)
0.008(0.20)
0.40
(10.16)
0.1 (2.54)
0.025 (0.63)
0.021 (0.53)
0.1
(2.54)
0.025 (0.63)
0.021 (0.53)
0.035 (0.90)
Unless otherwise stated all dimensions in inches (mm) ±0.01 (0.25).
All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position.
* Pin 5 is connected to secondary center tap. Package Weight 1.0g TYP.
RECOMMENDED FOOTPRINT DETAILS
6 Pin DIL
6 Pin SM
0.10 (2.54)
0.06 (1.60)
0.10 (2.54)
0.10 (2.54)
Ø0.05 (1.20) +0.006 (0.15)
-0.000 (0.00)
0.04
(1.00)
0.45
(11.50)
Unless otherwise stated all dimensions in inches (mm)
±0.01 (0.25). All pins on a 0.1 (2.54) pitch and within
±0.01 (0.25) of true position.
TUBE OUTLINE DIMENSIONS
SOLDERING INFORMATION1
0.43
(10.95)
Unless otherwise stated all
dimensions in inches (mm)
±0.01 (0.25).
0.16 (4.00)
0.023±0.005
(0.60±0.15)
0.51
(12.95)
Tube length: 18.3±0.08 (465±2).
Pin finish
Pure tin dip
Peak wave solder temperature
300˚C for 10 seconds
Peak reflow temperature
220˚C
1 For further information, please visit www.murata-ps.com/rohs
Tube material: Antistatic coated
clear pvc.
0.22 (5.50)
0.15
(3.80)
0.62 (15.70)
www.murata-ps.com
Technical enquiries - email: [email protected], tel: +44 (0)1908 615232
KMP_78250C_C02 Page 2 of 3
78250 Series
MAX250 Compatible Converter Transformers
TAPE & REEL SPECIFICATIONS
REEL OUTLINE DIMENSIONS
2.36 (60) Min.
Ø15.039 (382) Max.
0.94-1.08 (23.9-27.4)*
Ø 0.53 (13.50)
0.50 (12.80)
Leader section
15.7 (400) Min.
3.9 (100)
Min.
0.059 (1.50)
Min.
1.20
(30.4) Max.
Goods
enclosure
section
0.96 (24.4)
1.04 (26.4)
Trailer section
6.3 (160) Min.
Unless otherwise stated all
dimensions in inches (mm) ±0.01(0.25).
Ø 0.80 (20.20) Min.
* Includes flange distortion at outer edge.
Measured at hub.
TAPE OUTLINE DIMENSIONS
0.453 (11.50)
0.157 (4.00)
XYYWW
Cover tape
+0.004
+0.10
0.059 -0.000 (1.50 -0.00 )
0.079 (2.00)
78250C
0.945 +0.012 (24.00 +0.30
-0.10 )
-0.004
0.069 (1.75)
0.369 (9.37)
0.472 (12.00)
0.024 (0.60) Max.
Direction of unreeling
0.283 (7.20)
Unless otherwise stated all
dimensions in inches (mm) ±0.01(0.25).
USA:
Mansfield (MA), Tel: (800) 233 2765, email: [email protected]
Canada: Toronto, Tel: (866) 740 1232, email: [email protected]
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: [email protected] ISO 9001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2008 Murata Power Solutions, Inc.
www.murata-ps.com
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany: München, Tel: +49 (0)89-544334-0, email: [email protected]
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
Technical enquiries - email: [email protected], tel: +44 (0)1908 615232
KMP_78250C_C02 Page 3 of 3