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76250ENC, 76253/XXENC
EN Approved MAX250/251/253 Compatible Converter Transformers
SELECTION GUIDE
Order Code
76250ENC 76253/35ENC 76253/55ENC
Input Voltage V
3.3 5.0
Output Voltage V
5.0 5.0
Max. Output Current mA
100 200
Isolation Voltage VDC
6000 6000 6000
Turns Ratio
1CT:1 1:5 1:1.33
FEATURES
RoHS compliant Maxim MAX250/MAX251/MAX253 compatible BS EN 60950 approved Isolation to 6kVDC Toroidal construction Industry-standard pinout UL 94 V-0 package materials Fully encapsulated Compatible with RoHS soldering systems Backward compatible with Sn/Pb soldering systems
76250ENC CHARACTERISTICS
Parameter
Primary Inductance, LP (1&5) Leakage Inductance, LL (1&5) D.C. Resistance, RDC (1&5) Volt-time Product, ET (1&5)
2
Conditions
10kHz, 100mV 100kHz, 100mV 100kHz, 100mV <0.1VDC
Min.
1.0
Typ.
2.0 35 1.5 1.0
Max.
2.5 40 3.0 2.0
Units
mH H pF
Interwinding Capacitance, CWW (1&2)
Vs
50
76253/35ENC CHARACTERISTICS
Parameter
Primary Inductance, LP (1&5) Secondary Inductance, LS (2&6) Leakage Inductance, LL (1&5)2 Interwinding Capacitance, CWW (1&2) D.C. Resistance, RDC (1&5) Volt-time Product, ET (1&5)
Conditions
100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV <0.1VDC
Min.
140 700
Typ.
200
Max.
1000
Units
H H H pF
5.0 2.7 0.4 25 35
7.0 3.5 0.8
Vs
76253/55ENC CHARACTERISTICS
DESCRIPTION
The 76250ENC converter transformer is specifically designed for use with Maxim chipsets to provide isolated RS232 interfaces. A carefully controlled turns ratio ensures consistent performance whilst a toroidal construction minimises EMI. The 76253/XXENC converter transformers are specifically designed for use with the MAX253 chip set to provide isolated power supplies. The 5V version can supply 1W and the 3.3V version can supply 500mW. A centre tapped secondary winding allows for full bridge, half bridge or voltage doubling. The devices are fully approved to BS EN 60950 for use in telecoms applications.
Parameter
Primary Inductance, LP (1&5) Secondary Inductance, LS (2&6) Leakage Inductance, LL (1&5)2 Interwinding Capacitance, CWW (1&2) D.C. Resistance, RDC (1&5) Volt-time Product, ET (1&5)
Conditions
100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV <0.1VDC
Min.
80 142
Typ.
Max.
150 267
Units
H H H pF
7.0 2.7 0.5 30 40
10.0 3.5 0.9
Vs
ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range 76250EN Operating free air temperature range 76253/XXEN Storage temperature range Lead temperature 1.5mm from case for 10 seconds Peak current, IPK 76250EN Peak current, IPK 76253/XXEN Isolation voltage (flash tested for 1 second)
0C to 70C -40C to 85C -50C to 125C 300C 300mA 400mA 6000VDC
SOLDERING INFORMATION3
Peak wave solder temperature Pin finish
All specifications typical at TA=25C 1 Refer to mechanical dimensions for pin locations shown in brackets. 2 With pins 2 & 6 short circuited. 3 For further information, please visit www.murata-ps.com/rohs
300C for 10 seconds Matte tin
For full details go to www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KMP_7625XENC_B03 Page 1 of 4
76250ENC, 76253/XXENC
EN Approved MAX250/251/253 Compatible Converter Transformers
TYPICAL CHARACTERISTICS (VOLTAGE CURVES)
VOLTAGE CURVES
10 8 6 4 2 0 Output Voltage (V) Output Voltage (V)
76253/35ENC
10 8 6 4 2 0
76253/55ENC
0
20
40
60
80
100
0
Output Current (mA)
100 200 300 Output Current (mA)
400
EFFICIENCY CURVES
100 80 60 40 20 0
76253/35ENC
100 80 60 40 20 0
76253/55ENC
Efficiency (%)
0
20
40
60
80
100
Efficiency (%)
0
100
200
300
400
Output Current (mA)
Output Current (mA)
VOLTAGE DEVIATION
110
76253/35ENC
110
76253/55ENC
Voltage deviation from nominal 25C output (%)
Voltage deviation from nominal 25C output (%) -50 -25 0 25 50 75 100
105
105
100
100
95
95
90
90
-50
-25
0
25
50
75
100
Temperature (C)
Temperature (C)
All curves are derived from testing with the Maxim MAX235 IC using the circuit shown in application note MPAN-03 (download at http://www.murata-ps.com/data/apnotes/mpan-03.pdf).
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KMP_7625XENC_B03 Page 2 of 4
76250ENC, 76253/XXENC
EN Approved MAX250/251/253 Compatible Converter Transformers
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
15.00 (0.59)
1
15.00 (0.59)
2
12.50 (0.492)
12.00 (0.472)
2.54 (0.1)
3 5
76250ENC XYYWW
4* 6
4.10 (0.161) O0.560.05 (O0.0220.002) 7.50 (0.295)
10.16 (0.4)
2.42 (0.095)
Pin Connections 76250EN (Top View)
Pin Connections 76253/XXEN (Top View)
1
Primary
Secondary
2
1
Primary
Secondary
2
3
3
4
* 76250EN Pin not fitted. Unless otherwise stated all dimensions in mm (inches) 0.25mm (0.01). All pins on a 2.54mm (0.1") pitch and within 0.25mm (0.01") of true position.
5
6
5
6
TUBE DIMENSIONS
RECOMMENDED FOOTPRINT DETAILS
2.54 (0.100)
2.54 (0.100)
x6 HOLES* O1.00+0.15-0.00 (O0.039+0.006-0.000)
Tube length: 4802.00mm (18.900.079"). Tube quantity: 30 Tube material: Antistatic coated clear pvc. Unless otherwise stated all dimensions in mm (inches) -0.00 +0.50 (-0.00 +0.020).
Holes may be omitted for variants with fewer than 6 pins. Unless otherwise stated all dimensions in mm (inches) 0.25 (0.01). All pins on a 2.54 (0.1) pitch and within 0.25 (0.01) of true position.
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KMP_7625XENC_B03 Page 3 of 4
76250ENC, 76253/XXENC
EN Approved MAX250/251/253 Compatible Converter Transformers
TECHNICAL NOTES
ISOLATION VOLTAGE `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. All products in this series are 100% production tested at their stated isolation voltage. This series is recognised by the British Standards Institution to a working voltage of 300Vrms for Reinforced Insulation systems.
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 materials, construction and environment. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from the specified test voltage.
USA: Canada: UK:
Mansfield (MA), Tel: (508) 339 3000, email: sales@murata-ps.com Toronto, Tel: (866) 740 1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
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: sales@murata-ps.com 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. (c) 2008 Murata Power Solutions, Inc.
France: Japan: China:
Germany: Munchen, Tel: +49 (0)89-544334-0, email: ped.munich@murata-ps.com
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KMP_7625XENC_B03 Page 4 of 4

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