78250 CANDD | Alldatasheet
Document overview
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Technical content
FEATURES
n UL 94V-0 Package Material n Fully Encapsulated n Low Profile n 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. The surface mount devices are fully compatible with CECC00802 to 280°C which allows them to be placed and reflowed with IC’s thus reducing time and cost in production. SELECTION GUIDE 78250/78250M Parameter Conditions MIN TYP MAX Units Primary Inductance, LP 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, LL 100kHz, 100mV 2.0 3.0 µH Interwinding Capacitance, CWW 100kHz, 100mV 69 90 pF Volt-time Product, ET 5kHz, 5V 50 Vµs SELECTION GUIDE 78250V/78250MV Parameter Conditions MIN TYP MAX Units Primary Inductance, LP 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, LL 100kHz, 100mV 35 40 µH Interwinding Capacitance, CWW 100kHz, 100mV 9 12 pF Volt-time Product, ET 5kHz, 5V 50 Vµs Operating free air temperature range –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 300mA Isolation voltage 78250(M) (flash tested for 1 second) 1500Vrms Isolation voltage 78250V(M) (flash tested for 1 second) 4000Vrms ABSOLUTE MAXIMUM RATINGS All specifications typical at TA= 2 5 ° C .
78250 SERIES
www.dc-dc.com
C&D Technologies (NCL) Ltd Tanners Drive, Blakelands North Milton Keynes MK14 5BU, England Tel: +44 (0)1908 615232 Fax:+44 (0)1908 617545 email: info@cdtechno-ncl.com www: http://www.dc-dc.com C&D Technologies (NCL), Inc.
8917 Glenwood Avenue, Raleigh
NC 27612, USA Tel: +1 (919) 571-9405 Fax: +1 (919) 571-9262 email: info@us.cdtechno-ncl.com C&D Technologies (NCL) Limited reserve the right to alter or improve the specification, internal design or manufacturing process at any time, without notice. Please check with your supplier or visit our web site to ensure that you have the current and complete specification for your product before use. © C&D Technologies (NCL) Limited 2000 NMP 78250.2 No part of this publication may be copied, transmitted or stored in a retrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without prior written permission from C&D Technologies (NCL) Limited. Instructions for use are available from www.dc-dc.com MECHANICAL DIMENSIONS * Pin 5 is connected to secondary centre tap.
6 Pin DIP
6 Pin SM
9.52 max 8.89 max Primary Secondary 6.35 3.44±0.50 0.30 0.20 0.63 0.53 10.16 2.54 78250M XYYWW 9.52 max Top View Top View 8.89 max 6.35 0.90 12.70 0.30 0.20 0.63 0.53 2.54 Primary Secondary