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| 782485 Series ADM2485 Compatible Converter Transformers SELECTION GUIDE Order Code 782485/35C 782485/55C Nominal Input Voltage V 3.3 5.0 Nominal Output Voltage V 6.0 6.0 Max. Output Current mA 200 200 Isolation Voltage VRMS 2500 2500 Turns Ratio 1CT:2.2CT 1CT:1.5CT Package Style DIL DIL CHARACTERISTICS 782485/35C Parameter Conditions 100kHz, 10mV 100kHz, 10mV 100kHz, 10mV <0.1VDC 5kHz, 5V 782485/35C Typ. 234 168 24 273 12 Max. 782485/55C Typ. 513 192 37 383 19 Max. Units H nH pF m Vs FEATURES RoHS compliant Analog Devices ADM2485 compatible 2.5kVrms isolation Industry-standard pinout UL 94 V-0 package materials Low profile Toroidal construction Fully encapsulated Industrial temperature range Surface mount versions available soon Recommended by Analog Devices, Inc. Backward compatible with Sn/Pb soldering systems Primary Inductance, LP Leakage Inductance, LL Interwinding Capacitance, CWW Primary DC Resistance, RDC Volt-time Product, Et1 50 500 50 600 ABSOLUTE MAXIMUM RATINGS Operating free air temperature range Storage temperature range Isolation voltage (flash tested for 1 second) -40C to 85C -50C to 125C 2.5kVrms SOLDERING INFORMATION2 Peak wave solder temperature Pin finish Specifications typical at TA = 25C 1 Where pulse applied across pins 1 and 2. 2 For further information, please visit www.murata-ps.com/rohs 300C for 10 seconds Matte tin TECHNICAL NOTES ISOLATION VOLTAGE 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. 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. 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. DESCRIPTION The 782485 series of converter transformers are specifically designed for use with Analog Devices chipsets to provide isolated RS-485 and RS-422 interfaces. Carefully controlled turns ratios ensure consistent performance whilst a toroidal construction minimises EMI. `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. 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 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. 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_782485C_A03 Page 1 of 2 782485 Series ADM2485 Compatible Converter Transformers PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS 9.77 (0.385) Max. RECOMMENDED FOOTPRINT DETAILS TOP VIEW Primary Secondary 2.54 (0.10) 6 1 9.14 (0.360) Max. 2.54 (0.10) 2 5 4 782485/35C XYYWW 3 O1.20 (0.05) +0.15 (0.006) -0.00 (0.000) 6.35 (0.25) 3.440.50 (0.1350.02) 0.30(0.012) 0.20(0.008) 0.6 (0.024) 10.160.40 (0.400.016) 2.54 (0.1) 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. Package Weight 1.0g TYP. 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. TUBE OUTLINE DIMENSIONS 10.65 - 11.65 (0.419 - 0.459) 4.00 (0.16) 0.600.15 (0.0240.006) 12.95 (0.51) Unless otherwise stated all dimensions in mm (inches) 0.25 (0.01). Tube length: 5002 (19.70.08) Tube quantity: 50 Tube material: Antistatic coated clear PVC. 5.20 (0.21) 3.80 (0.15) 15.70 (0.62) USA: UK: France: Japan: Mansfield (MA), Tel: (800) 233 2765, email: sales@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 Website: www.murata-ps.jp Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Canada: Toronto, Tel: (866) 740 1232, email: toronto@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. Germany: Munchen, Tel: +49 (0)89-544334-0, email: ped.munich@murata-ps.com China: www.murata-ps.com Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 KMP_782485C_A03 Page 2 of 2 |
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