• Document: Education and training in Electronic Design Realisation DfA checklist and Good Practice Guide written by Neil Purves Electronic Design Realisation Materials production: EDR Centre
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Education and training in Electronic Design Realisation DfA checklist and Good Practice Guide written by Neil Purves Electronic Design Realisation www.edrcentre.org.uk Materials production: EDR Centre First published by EDR Ltd, London © 2002. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, electrostatic, magnetic tape, mechanical, photocopying, recording or otherwise – without permission in writing from EDR Ltd, Tweed Horizons, Newton St Boswells, Melrose, TD6 0SG. The moral right of Neil Purves to be identified as the author of this document has been asserted by him in accordance with Sections 77 and 78 of the Copyright, Designs and Patents Act 1988. DfA checklist and Good Practice Guide Contents 1 DfA checklist.............................................................................................. 3 Initial Setup .......................................................................................................... 3 Design input.......................................................................................................... 3 Initial Review......................................................................................................... 3 Design preparation ................................................................................................ 3 Placement............................................................................................................. 4 Routing, Test and Silkscreen .................................................................................. 4 Artwork files .......................................................................................................... 5 Drawings and Release Data.................................................................................... 5 2 Design for Assembly ................................................................................... 6 3 The DfA review process............................................................................... 7 4 Items to consider when designing a PCB for assembly ................................. 8 General items ....................................................................................................... 8 PCB assembly ....................................................................................................... 8 Box build assembly................................................................................................ 8 Prototypes and pilot builds ..................................................................................... 9 5 Understanding the assembler’s capabilities ................................................. 9 6 Machine manufacturers requirements – design for worst case...................... 9 7 A reference to IPC .................................................................................... 11 Through hole ....................................................................................................... 14 Surface mount..................................................................................................... 14 General SMT footprint design rules ....................................................................... 14 8 Defining origins for SMT and PTH footprints............................................... 15 9 Panelisation considerations ...................................................................... 17 V-scoring............................................................................................................. 19 Break-off tabs...................................................................................................... 19 10 De-paneling methods ................................................................................ 21 V-scoring............................................................................................................. 21 Break-off tabs...................................................................................................... 22 © 2002 EDR Ltd 1 DfA checklist and Good Practice Guide 11 Board and panel edge clearances.............................................................. 24 12 Tooling holes............................................................................................ 25 Description.......................................................................................................... 25 Position .............................................................................................................. 26 13 Silkscreen – component legends and orientation marks ............................. 26 General.................

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