1、BS EN 16602-70-12:2016 Space product assurance Design rules for printed circuit boards BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 16602-70-12:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 16602-70-12:2016. Th
2、e UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract.
3、 Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 93136 9 ICS 31.180; 49.140 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under th
4、e authority of the Standards Policy and Strategy Committee on 31 October 2016. Amendments/corrigenda issued since publication Date Text affectedBS EN 16602-70-12:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16602-70-12 October 2016 ICS 31.180; 49.140 English version Space product assuran
5、ce - Design rules for printed circuit boards Assurance produit des projets spatiaux - Rgles de conception des circuits imprims Raumfahrtproduktsicherung - Designregeln fr Leiterplatten This European Standard was approved by CEN on 22 May 2016. CEN and CENELEC members are bound to comply with the CEN
6、/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Cen
7、tre or to any CEN and CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre h
8、as the same status as the official versions. CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, H
9、ungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN/CENELEC All rights of exploitati
10、on in any form and by any means reserved worldwide for CEN national Members and for CENELEC Members. Ref. No. EN 16602-70-12:2016 EBS EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 2 Table of contents European foreword 12 Introduction 13 1 Scope . 14 2 Normative references . 15 3 Terms, definitions and
11、 abbreviated terms 16 3.1 Terms from other standards 16 3.2 Terms specific to the present standard . 16 3.3 Abbreviated terms. 24 4 Principles 26 4.1 Qualified PCBs . 26 4.2 Manufacturing tolerances 26 4.3 Reliability of design . 26 5 Design review and MRR . 28 5.1 Overview 28 5.2 Documentation . 28
12、 6 General design and production requirements . 30 6.1 Reliability of design . 30 6.2 Choice of materials and build-up . 30 6.2.1 Overview . 30 6.2.2 Material selection 33 6.3 Selection of the PCB manufacturer . 33 6.4 Traceability and marking . 33 7 Rigid PCBs 34 7.1 PCB build-up 34 7.1.1 General .
13、 34 7.1.2 Copper styles 34 7.1.3 Dielectric thickness . 36 7.2 PCB dimension . 39 BS EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 3 7.3 Thickness of PCB . 39 7.3.1 General . 39 7.3.2 Polyimide PCB 40 7.3.3 Epoxy PCB . 40 7.3.4 Number of copper layers in PCB . 40 7.3.5 Aspect ratio of vias 40 7.4 Trac
14、k width and spacing . 41 7.4.1 General . 41 7.4.2 Manufacturing tolerances for width and spacing 41 7.4.3 External layers 42 7.4.4 Normal pitch tracks on internal layers 43 7.4.5 Fine pitch tracks on internal layers 44 7.4.6 Routing to AAD footprint on internal layers 45 7.5 Pad design . 46 7.5.1 No
15、n-functional pad removal 46 7.5.2 Pad dimensions 46 7.5.3 Non-circular external pads 48 7.6 Copper planes in rigid PCB . 49 7.7 Design considerations for the prevention of sliver and peelable 50 7.8 PCB surface finish 50 7.8.1 Metallization 50 7.8.2 Solder mask 51 8 Flex PCBs 52 8.1 Overview 52 8.2
16、Dynamic applications 52 8.3 PCB build-up 52 8.3.1 General . 52 8.3.2 Dielectric materials 52 8.3.3 Copper cladding 53 8.3.4 Copper planes in flex PCB 53 8.4 Track design . 54 8.5 Through holes . 55 8.5.1 Annular ring. 55 8.5.2 Vias and pads . 56 8.5.3 Tear drop pad for flex PCB 56 8.6 Bending radius
17、 57 8.6.1 Overview . 57 BS EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 4 8.6.2 General . 57 8.7 Sculptured flex PCB 58 8.7.1 Overview . 58 8.7.2 General . 58 8.7.3 Copper foil dimensions for build-up . 58 8.7.4 Connection finger 59 8.7.5 Through-holes . 60 8.7.6 Bending radius 61 9 Rigid-flex PCBs .
18、 62 9.1 Overview 62 9.2 General . 62 9.3 Build-up 63 9.4 Cover layer . 64 9.5 Interface of rigid part and flexible part . 64 9.6 Pads . 64 10 Thermal rules and heat sinks 65 10.1 Overview 65 10.2 General requirements . 65 10.3 Specific requirements for external heat sink 65 10.3.1 Overview . 65 10.3
19、.2 Construction of the interface between PCB and heat sink . 65 10.3.3 Dimensional requirements . 66 10.4 Specific requirements for internal heat sink 68 10.4.1 General . 68 10.4.2 Cu thickness and type . 68 10.4.3 CIC and Molybdenum inserts 69 10.4.4 Dimensional requirements . 69 11 HDI PCBs . 71 1
20、1.1 Overview 71 11.2 Justification . 71 11.3 Microvia technology 71 11.4 Microvias 72 11.4.1 Build-up of microvia layers 72 11.4.2 Design of microvias . 74 11.4.3 Pad design for microvia . 74 11.4.4 Annular ring for microvias 75 BS EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 5 11.5 Core PCB for HDI
21、. 75 11.5.1 General build-up . 75 11.5.2 Annular ring on vias for fine pitch footprint 76 11.5.3 Track width and spacing on external layers . 77 11.5.4 Track width and spacing on internal layers for impedance control and routing to AAD . 77 11.5.5 Track width and spacing on internal layers for diffe
22、rential pair routing within the footprint of 1,0 mm pitch AAD 78 11.5.6 Aspect ratio of vias for footprint of AAD with 1 mm pitch . 79 12 PCBs for high frequency applications 81 12.1 Material selection 81 12.2 Build-up of RF PCB 81 12.3 Embedded film resistors . 81 12.4 Thickness of RF PCB . 83 12.5
23、 Track width and spacing . 83 12.5.1 External layers 83 12.5.2 Internal Layers 84 12.6 Pad design . 84 12.6.1 Pad dimensions 84 12.6.2 Non-functional pads 84 12.7 Surface finish 84 12.8 Profiled layers and vias . 84 13 Electrical requirements for PCB design . 86 13.1 Overview 86 13.2 General . 87 13
24、.3 PCB drying . 87 13.4 Electrical characteristics . 87 13.5 Floating metal . 88 13.6 Current rating 88 13.6.1 Overview . 88 13.6.2 Requirements for temperature increment 89 13.6.3 Requirements for the model IPC-2152 for current rating . 89 13.6.4 Amendments to the model from IPC-2152 90 13.7 Provis
25、ions to prevent open circuit failure on critical tracks 91 13.7.1 Overview . 91 13.7.2 Routing . 92 13.8 Voltage rating . 92 BS EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 6 13.8.1 Overview . 92 13.8.2 General requirements . 92 13.8.3 Spacing on flex and rigid-flex laminate 94 13.8.4 Conformal coati
26、ng . 95 13.9 Double insulation design rules for critical tracks 96 13.9.1 Overview . 96 13.9.2 Critical nets . 96 13.9.3 Prevention of short circuit 96 13.10 Insulation distance of combined requirements on rigid PCB . 101 13.11 Controlled impedance tracks 106 13.11.1 Definitions specific to controll
27、ed impedance 106 13.11.2 General rules 106 13.11.3 Microstrip and stripline 106 13.11.4 Line impedance termination for end-to-end configuration 107 13.11.5 Line impedance termination for multidrop configuration 107 13.12 Digital PCB . 108 13.12.1 Overview . 108 13.12.2 Zone management and routing .
28、108 13.12.3 Criticality of digital signals . 109 13.13 Analog PCB 110 13.13.1 Overview . 110 13.13.2 Criticality of analog signals 110 13.13.3 Routing and shielding 111 13.14 Mixed analog-digital PCB 112 14 Design for assembly. 113 14.1 Overview 113 14.2 General . 113 14.3 Placement requirements . 1
29、14 14.3.1 Conductive patterns 114 14.3.2 Components 115 14.3.3 Component pads . 117 14.3.4 Fan out of SMT pads . 118 14.3.5 Fan out of PTH 120 14.4 Specific requirements for fused tin-lead finish . 121 14.5 Dimensional requirements for SMT foot print 121 14.5.1 Overview . 121 14.5.2 General . 122 BS
30、 EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 7 14.5.3 Bipolar components 123 14.5.4 SOIC components . 124 14.5.5 J-leaded components 125 14.5.6 LCC components 126 14.5.7 Flat pack components . 128 14.5.8 AAD components 129 15 Design of test coupon 130 15.1 Design rules for test coupon . 130 15.2 Tes
31、t coupon design 130 Annex A (normative) PCB definition dossier - DRD . 133 A.1 DRD identification . 133 A.1.1 Requirement identification and source document 133 A.1.2 Purpose and objective . 133 A.2 Expected response . 133 A.2.1 Scope and content 133 A.2.2 Special remarks 139 A.2.3 Example figures 1
32、39 Annex B (normative) PCB manufacturing dossier DRD . 144 B.1 DRD identification . 144 B.1.1 Requirement identification and source document 144 B.1.2 Purpose and objective . 144 B.2 Expected response . 144 B.2.1 Scope and content 144 B.2.2 Special remarks 145 Annex C (informative) Example of capabi
33、lity list of PID 146 Annex D (informative) Track current rating computation methodology . 148 D.1 Introduction of the three models 148 D.1.1 Overview . 148 D.1.2 Formulae for the three models 149 D.1.3 Example of current rating 150 D.2 Track current rating computation based on IPC-2152 . 150 D.3 Tra
34、ck current rating computation based on CNES/QFT/IN.0113 . 154 D.4 Track current rating computation based on IPC-2221A . 158 Annex E (informative) Example of calculation of PTH pad dimensions . 162 Annex F (informative) Prevention of resin starvation and cracks 164 BS EN 16602-70-12:2016 EN 16602-70-
35、12:2016 (E) 8 F.1 Prevention of resin cracks. 164 F.2 Prevention of resin starvation . 164 Annex G (informative) Example of MRR checklist 166 Bibliography . 170 Figures Figure 3-1: Simplified build-up of HDI PCB . 20 Figure 3-2: Projected peak-to-peak insulation distance 23 Figure 7-1: Example of au
36、tomated fine pitch routing and possible improvements . 45 Figure 7-2: Comparison between circular and oblong pads showing annular ring and the centre of the hole misregistered with the centre of the pad . 48 Figure 7-3: Grid copper plane with openings 49 Figure 7-4: Example of peelable (left) and sl
37、iver (right). 50 Figure 8-1: Clearance of tracks on flex PCBs. 54 Figure 8-2: Tracks on flex, defining termination and bending zones. 55 Figure 8-3: Teardrop reinforcement of terminal pads in flex PCB. 56 Figure 8-4: Bending radius of assembled flex . 57 Figure 8-5: Sculptured flex circuit . 58 Figu
38、re 8-6: Build-up of sculptured flex circuit 59 Figure 8-7: Connection finger of sculptured flex circuit . 60 Figure 8-8 Side view of a component hole for sculptured flex . 61 Figure 9-1 Example of a build-up of a 6 layer symmetric rigid-flex 62 Figure 10-1: Lay out of heat sink and PCB . 67 Figure 1
39、0-2: drilling holes and slots in internal heat sink . 70 Figure 10-3: Angle of intersection of overlapping holes 70 Figure 11-1: Build-up of HDI PCBs with staggered (left) and stacked (right) microvia. 72 Figure 11-2: Dimple on a microvia 74 Figure 11-3: Tear drop pad design . 76 Figure 11-4: Exampl
40、e of routing two differential pair tracks between vias in a footprint of an AAD with 1,27 mm pitch. . 78 Figure 11-5: Example of routing two differential pair tracks between vias in a footprint of an AAD with 1 mm pitch. 80 Figure 13-1: Cross section of PCB with insulation distances. . 87 Figure 13-
41、2: Example of double insulation by increasing distance in X,Y and by not superimposing copper on adjacent layers 100 Figure 13-3: Example of double insulation by increasing distances in X,Y and by using two insulators in Z direction. . 100 Figure 13-4: Edge coupled differential striplines . 107 BS E
42、N 16602-70-12:2016 EN 16602-70-12:2016 (E) 9 Figure 14-1: Illustration of surface pattern to adjacent surroundings . 115 Figure 14-2: Illustration of component placing on PCB w.r.t. adjacent surrounding . 116 Figure 14-3: Illustration of pad placing on PCB with respect to adjacent surroundings 118 F
43、igure 14-4: Fan out from SMT pad to via 119 Figure 14-5: Example of point symmetric AAD footprint 120 Figure 14-6: Track width (I c ) ratio to PTH pad (D) diameter. 120 Figure 14-7: Track length (Lc) between soldering pad of PTH (D 1 ) and via pad (D 3 ) 121 Figure 14-8:Illustration of bipolar compo
44、nent pads . 123 Figure 14-9: Illustration of SOIC component pads 124 Figure 14-10: Illustration of J-leaded component pads . 125 Figure 14-11: Illustration of LCC component pads 126 Figure 14-12: Illustration of FP and QFP component pads . 128 Figure 14-13: Illustration of AAD component pads 129 : E
45、xample of PCB mechanical layout 139 Figure A-1: Example of a drilling drawing 140 Figure A-2: Example of a table indicating as-designed plated hole diameters . 141 Figure A-3: Example of build-up data 142 Figure A-4: Example of the archive file with CRC 143 Figure A-5: Comparison between CNES and IP
46、C-2152 current rating at 5C increase . 149 Figure D-1: IPC-2152: Current rating A vs cross sectional area mm 2 in double log Figure D-2 scale 151 : IPC-2152: Track width mm vs cross sectional area mm 2 151 Figure D-3: IPC-2152: Current rating based on Figure D-2, range 0-25 A . 152 Figure D-4: IPC-2
47、152: Current rating based on Figure D-2, range 0-10 A . 152 Figure D-5: IPC-2152: Current rating based on Figure D-2, range 0-5 A . 153 Figure D-6: IPC-2152: Current rating based on Figure D-2, range 0-2 A . 153 Figure D-7: CNES/QFT/IN.0113: Current rating A vs cross sectional area mm 2 in Figure D-
48、8 double log scale . 155 : CNES/QFT/IN.0113: Track width mm vs cross sectional area mm 2 155 Figure D-9: CNES/QFT/IN.0113: Current rating based on Figure D-8, range 0-25 A . 156 Figure D-10: CNES/QFT/IN.0113: Current rating based on Figure D-8, range 0-10 A . 156 Figure D-11: CNES/QFT/IN.0113: Curre
49、nt rating based on Figure D-8, range 0-5 A . 157 Figure D-12: CNES/QFT/IN.0113: Current rating based on Figure D-8, range 0-2 A . 157 Figure D-13: IPC-2221A: Current rating A vs cross sectional area mm 2 in double log Figure D-14 scale 159 : IPC-2221A: Track width mm vs cross sectional area mm 2 159 Figure D-15: IPC-2221A: Current rating based on Figure D-14, range 0-25 A . 160 Figure D-16BS EN 16602-70-12:2016 EN 16602-70-12:2016 (E) 10 : IPC-2221A: Current rating based on Figure D-14, range 0-10 A . 160 Figure D-17: IPC-2221A: Current rating based
