76253/55ENC

## www.murata-ps.com 

## **76250ENC, 76253/XXENC** 

EN Approved MAX250/251/253 Compatible Converter Transformers 

## **SELECTION GUIDE** 

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|---|---|---|---|---|---|
|Output|Max. Output|Isolation|
|Input Voltage|Turns|
|Order Code|Voltage|Current|Voltage|
|Ratio|
|V|V|mA|VDC|
|76250ENC|-|-|-|6000|1CT:1|
|76253/35ENC|3.3|5.0|100|6000|1:√5|
|76253/55ENC|5.0|5.0|200|6000|1:1.33|

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## **FEATURES** 

RoHS compliant 

axim MAX250/MAX251/MAX253 compatible 

EN 60950 approved 

lation to 6kVDC roidal construction ~~=~~ ustry-standard pinout 94 V-0 package materials 

lly encapsulated mpatible with RoHS soldering systems ckward compatible with Sn/Pb  soldering systems 

## **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. 

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|---|---|---|---|---|---|
|S|76250ENC CHARACTERISTICS|SS|
|Parameter|Conditions|Min.|Typ.|Max.|Units|
|Primary Inductance, LP  (1&5)|10kHz, 100mV|1.0|2.0|2.5|mH|
|Leakage Inductance, LL (1&5)|[2]|100kHz, 100mV|35|40|μH|
|Interwinding Capacitance, CWW  (1&2)|100kHz, 100mV|1.5|3.0|pF|
|D.C. Resistance, RDC  (1&5)|<0.1VDC|1.0|2.0|Ω|
|Volt-time Product, ET  (1&5)|50|Vμs|
|76253/35ENC CHARACTERISTICS|
|SSS|
|Parameter|Conditions|Min.|Typ.|Max.|Units|
|Primary Inductance, LP  (1&5)|100kHz, 250mV|140|200|μH|
|Secondary Inductance, LS  (2&6)|100kHz, 250mV|700|1000|μH|
|Leakage Inductance, LL  (1&5)|[2]|100kHz, 250mV|5.0|7.0|μH|
|Interwinding Capacitance, CWW  (1&2)|100kHz, 250mV|2.7|3.5|pF|
|D.C. Resistance, RDC  (1&5)|<0.1VDC|0.4|0.8|Ω|
|Volt-time Product, ET  (1&5)|25|35|Vμs|

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|~|76253/55ENC CHARACTERISTICS|~~|
|Parameter|Conditions|Min.|Typ.|Max.|Units|
|Primary Inductance, LP  (1&5)|100kHz, 250mV|80|150|μH|
|Secondary Inductance, LS  (2&6)|100kHz, 250mV|142|267|μH|
|Leakage Inductance, LL  (1&5)|[2]|100kHz, 250mV|7.0|10.0|μH|
|Interwinding Capacitance, CWW  (1&2)|100kHz, 250mV|2.7|3.5|pF|
|D.C. Resistance, RDC  (1&5)|<0.1VDC|0.5|0.9|Ω|
|Volt-time Product, ET  (1&5)|30|40|Vμs|

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## ~~eC~~ **ABSOLUTE MAXIMUM RATINGS** 

Operating free air temperature range 76250EN 0°C to 70°C Operating free air temperature range 76253/XXEN -40°C to 85°C Storage temperature range -50°C to 125°C Lead temperature 1.5mm from case for 10 seconds 300°C Peak current, IPK  76250EN 300mA Peak current, IPK 76253/XXEN 400mA Isolation voltage (flash tested for 1 second) 6000VDC 

~~eC~~ **SOLDERING INFORMATION[3]** Peak wave solder temperature 300˚C for 10 seconds Pin finish Matte tin 

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©<br>For full details go to<br>www.murata-ps.com/rohs<br>**----- End of picture text -----**<br>


All specifications typical at TA=25°C 

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 

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**KMP_7625XENC_C01** Page 1 of 5 

**76250ENC, 76253/XXENC** 

EN Approved MAX250/251/253 Compatible Converter Transformers 

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S TYPICAL CHARACTERISTICS (VOLTAGE CURVES) SCs<br>VOLTAGE CURVES<br>76253/35ENC 76253/55ENC<br>108 KP 108 | ff<br>6 6<br>A<br>4 4<br>20 SSStt yy 20 |<br>0  20  40  60  80  100 0  100  | 200  | 300  400<br>Output Current (mA) Output Current (mA)<br>EFFICIENCY CURVES<br>76253/35ENC 76253/55ENC<br>100 100<br>80 TL 80 oe<br>60 60<br>- aN<br>40 Aa 40 po<br>20 fo 20 po<br>0 0<br>0  AGRE 20  40  60  80  100 0  | 100  | | 200  300  400<br>Output Current (mA) Output Current (mA)<br>VOLTAGE DEVIATION<br>76253/35ENC 76253/55ENC<br>110 110<br>105 105<br>ttt itty<br>100 100<br>met} = LD er<br>95 95<br>VaoING as<br>caeees “Pane<br>90 90<br>-50  -25  0  25  50  75  100 -50  -25  0  25  50  75  100<br>Temperature (ºC) Temperature (ºC)<br>Output Voltage (V) Output Voltage (V)<br>Efficiency (%) Efficiency (%)<br>25ºC output (%) 25ºC output (%)<br>Voltage deviation from nominal Voltage deviation from nominal<br>**----- End of picture text -----**<br>


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). 

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**KMP_7625XENC_C01** Page 2 of 5 

## **76250ENC, 76253/XXENC** 

EN Approved MAX250/251/253 Compatible Converter Transformers 

## **PACKAGE SPECIFICATIONS** 

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MECHANICAL DIMENSIONS<br>15.00 (0.59)<br>1 2<br>12.50 12.00 2.54<br>15.00  (0.492) (0.472) (0.1)<br>(0.59) 3 76250ENC 4*<br>XYYWW<br>5 6 7.50<br>4.10 (0.295)<br>(0.161)<br>Ø0.56±0.05 10.16 (0.4) 2.42 (0.095)<br>(Ø0.022±0.002)<br>Pin Connections 76250EN (Top View) Pin Connections 76253/XXEN (Top View)<br>Primary Secondary Primary Secondary<br>1 2 1 2<br>3 3 4<br>* 76250EN Pin not fitted.<br>5 6 5 6<br>Unless otherwise stated all dimensions in mm (inches) ±0.25mm (±0.01).<br>All pins on a 2.54mm (0.1") pitch and within ±0.25mm (0.01") of true position.<br>**----- End of picture text -----**<br>


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15.00 (0.59)<br>1 2<br>12.50 12.00 2.54<br>15.00  (0.492) (0.472) (0.1)<br>(0.59) 3 76250ENC 4*<br>XYYWW<br>5 6 7.50<br>4.10 (0.295)<br>(0.161)<br>Ø0.56±0.05 10.16 (0.4) 2.42 (0.095)<br>(Ø0.022±0.002)<br>Pin Connections 76250EN (Top View) Pin Connections 76253/XXEN (Top View)<br>Primary Secondary Primary Secondary<br>1 2 1 2<br>3 3 4<br>* 76250EN Pin not fitted.<br>5 6 5 6<br>Unless otherwise stated all dimensions in mm (inches) ±0.25mm (±0.01).<br>All pins on a 2.54mm (0.1") pitch and within ±0.25mm (0.01") of true position.<br>TUBE DIMENSIONS RECOMMENDED FOOTPRINT DETAILS<br>��������������������������<br>������������� 2.54 (0.100)<br>������ �����<br>������� �������<br>����<br>�������<br>x6 HOLES*<br>������������� Ø1.00+0.15-0.00 (Ø0.039+0.006-0.000)<br>Tube length: 480±2.00mm (18.90±0.079"). Tube quantity: 30 Holes may be omitted for variants with fewer than 6 pins.<br>Tube material: Antistatic coated clear pvc. Unless otherwise stated all dimensions in mm (inches) ±0.25 (0.01).<br>Unless otherwise stated all dimensions in mm (inches) -0.00 +0.50 (-0.00 +0.020).  All pins on a 2.54 (0.1) pitch and within ±0.25 (0.01) of true position.<br>2.54 (0.100)<br>**----- End of picture text -----**<br>


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**KMP_7625XENC_C01** Page 3 of 5 

## **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. 

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**KMP_7625XENC_C01** Page 4 of 5 

## **76250ENC, 76253/XXENC** 

EN Approved MAX250/251/253 Compatible Converter Transformers 

## **DISCLAIMER** 

Unless otherwise stated in the datasheet, all products are designed for standard commercial and industrial applications and NOT for safety-critical and/or life-critical applications. 

Particularly for safety-critical and/or life-critical applications, i.e. applications that may directly endanger or cause the loss of life, inflict bodily harm and/or loss or severe damage to equipment/property, and severely harm the environment, a prior explicit written approval from Murata is strictly required. Any use of Murata standard products for any safety-critical, life-critical or any related applications without any prior explicit written approval from Murata shall be deemed unauthorised use. 

These applications include but are not limited to: 

- Aircraft equipment 

- Aerospace equipment 

- Undersea equipment 

- Power plant control equipment 

- Medical equipment 

- Transportation equipment ( automobiles, trains, ships, etc.) 

- Traffic signal equipment 

- Disaster prevention / crime prevention equipment 

- Data Processing equipment 

Murata makes no express or implied warranty, representation, or guarantee of suitability, fitness for any particular use/purpose and/or compatibility with any application or device of the buyer, nor does Murata assume any liability whatsoever arising out of unauthorised use of any Murata product for the application of the buyer. The suitability, fitness for any particular use/purpose and/or compatibility of Murata product with any application or device of the buyer remain to be the responsibility and liability of the buyer. 

Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards that anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm, and take appropriate remedial actions. Buyer will fully indemnify and hold Murata, its affiliated companies, and its representatives harmless against any damages arising out of unauthorised use of any Murata products in any safety-critical and/ or life-critical applications. 

Remark: Murata in this section refers to Murata Manufacturing Company and its affiliated companies worldwide including, but not limited to, Murata Power Solutions. 

**This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: https://www.murata.com/en-eu/products/power/requirements** 

Murata Power Solutions (Milton Keynes) Ltd. 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. _**© 2021 Murata Power Solutions (Milton Keynes) Ltd**_ 

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**KMP_7625XENC_C01** Page 5 of 5