76250ENC, 76253/XXENC
EN Approved MAX250/251/253 Compatible Converter Transformers
SELECTION GUIDE
Output
Voltage
Max. Output
Current
Isolation
Voltage
Input Voltage
Turns
Ratio
Order Code
V
-
V
-
mA
-
VDC
76250ENC
76253/35ENC
76253/55ENC
6000
6000
6000
1CT:1
1:√5
3.3
5.0
5.0
5.0
100
200
1:1.33
76250ENC CHARACTERISTICS
Parameter
FEATURES
ꢀRoHS compliant
Conditions
Min.
1.0
Typ.
2.0
35
Max.
Units
mH
μH
Primary Inductance, LP (1&5)
Leakage Inductance, LL (1&5)2
10kHz, 100mV
100kHz, 100mV
2.5
40
ꢀMaxim MAX250/MAX251/MAX253
compatible
Interwinding Capacitance, CWW (1&2) 100kHz, 100mV
1.5
1.0
3.0
2.0
pF
D.C. Resistance, RDC (1&5)
Volt-time Product, ET (1&5)
<0.1VDC
Ω
Vμs
ꢀBS EN 60950 approved
ꢀIsolation to 6kVDC
50
76253/35ENC CHARACTERISTICS
Parameter
ꢀToroidal construction
Conditions
Min.
140
700
Typ.
200
Max.
Units
μH
ꢀIndustry-standard pinout
ꢀUL 94 V-0 package materials
ꢀFully encapsulated
Primary Inductance, LP (1&5)
Secondary Inductance, LS (2&6)
Leakage Inductance, LL (1&5)2
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
1000
7.0
μH
5.0
2.7
0.4
35
μH
Interwinding Capacitance, CWW (1&2) 100kHz, 250mV
3.5
pF
ꢀCompatible with RoHS soldering systems
D.C. Resistance, RDC (1&5)
Volt-time Product, ET (1&5)
<0.1VDC
0.8
Ω
Vμs
ꢀBackward compatible with
Sn/Pb soldering systems
25
76253/55ENC CHARACTERISTICS
Parameter
Conditions
Min.
80
Typ.
Max.
150
267
10.0
3.5
Units
μH
DESCRIPTION
Primary Inductance, LP (1&5)
Secondary Inductance, LS (2&6)
Leakage Inductance, LL (1&5)2
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
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.
142
μH
7.0
2.7
0.5
40
μH
Interwinding Capacitance, CWW (1&2) 100kHz, 250mV
pF
D.C. Resistance, RDC (1&5)
Volt-time Product, ET (1&5)
<0.1VDC
0.9
Ω
Vμs
30
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.
ABSOLUTE MAXIMUM RATINGS
0°C to 70°C
Operating free air temperature range 76250EN
Operating free air temperature range 76253/XXEN
Storage temperature range
-40°C to 85°C
-50°C to 125°C
300°C
Lead temperature 1.5mm from case for 10 seconds
Peak current, IPK 76250EN
300mA
The devices are fully approved to BS EN 60950 for
use in telecoms applications.
400mA
Peak current, IPK 76253/XXEN
6000VDC
Isolation voltage (flash tested for 1 second)
SOLDERING INFORMATION3
Peak wave solder temperature
Pin finish
300˚C for 10 seconds
Matte tin
All specifications typical at TA=25°C
ꢀ
ꢀ
1
2
3
Refer to mechanical dimensions for pin locations shown in brackets.
With pins 2 & 6 short circuited.
For further information, please visit www.murata-ps.com/rohs
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
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