IPC 2. 22. 1B PCB Trace Spacing Clearance by Voltage. IPC 2. 22. 1 is generally accepted in electronic industry as a generic PCB design standard. However, when it comes to distances between the PC traces, in my view, the IPC 2. Of course, it is not the only standard that defines the electrical clearance. 1 NJG1681MD7 Ver. 20150717 HIGH POWER SPDT SWITCH GaAs MMIC GENERAL DESCRIPTION PACKAGE OUTLINE The NJG1681MD7 is a GaAs SPDT switch MMIC suitable for. For power conversion circuits IPC 9. SPACING mm 0. Vpeak x. 0. 05. In general, a linear relationship makes more sense. However, these requirements were also too conservative and at low voltages were not even practically doable. The latest IPC 9. B document left the above equation only for V1. V. At other voltages the limits are as following 0. Vlt 1. 5V, 0. 2. VVlt 3. 0V and 0. Vpeak0. 0. 1 for 3. 1 G 2 R L G2RL PCB Power Relay Low Profile Power Relay with 15. 7 mm height, ideal for incorporation in miniature equipments A wide variety of single pole, double. Proceedings of the 5th International Workshop on Thermal Investigations of ICs and Microstructures THERMINIC, pp. October 4 6, 1999, Rome, Italy. ACDC External power supplies for medical, military and industrial applications. 5 40 Series Miniature PCBPlugin relays 8 10 16 A Technical data Insulation according to EN 618101 1 pole 2 pole Nominal voltage of supply system V AC 230400. This is 100W LM3886 power amplifier is based on the PA100 parallel amplifier detailed in National Semiconductors application note AN1192. Since my DIY speaker is 4. VVlt 1. 00. V. Note that all IPC standards are voluntarily rather than mandatory. Conversely, for the products covered by safety standards the creepage and clearance requirements of a respective ULIEC standard are mandatory. For example, for most ITE applications you need to use UL 6. Tables 2. K to 2. N. One would think that UL norms should be most stringent than IPC. However, it is interesting to note that when it comes to functional insulation in secondary circuits, UL requirements are not necessarily more stringent than IPC. See our calculator and guide to PCB creepage vs. IPC and UL requirements. Internal layers. External conductors,uncoated. External conductorscoated. Vpk,Vmminchmminchmminch. Note that if your ITE is manufactured or sold in China, their standard GB 4. This will require clearance limit 1. IECUL 6. 09. 50 1 unless your device marked as suitable for use only up to 2. Also note that the discussed requirements here are related only to breakdown safety. From the standpoint of PC trace temperature rise, you may want to increase the distances between power tracks see this analysis and calculator. The chart to the left is adapted from columns B1, B2, B4 of IPC 2. B Table 6 1. It lists recommended minimum spacing between internal and external conductors as a function of peak working voltage level for intended use at altitude below 3. The official IPC table also provides the numbers for external conductors at elevations 3. I omitted here. Note that IPC gives the spacings only up to 5. V and provides formulas for calculating their values above 5. V. For example, for uncoated tracks it is 2. V 5. 000. 0. 05 mm. For your convenience, in this table Ive added calculated distances for higher voltages based on these formulas. All my calculated numbers of course are rounded. Note This guide is provided for informational purposes only and does not constitude a professional or a legal advice see the Disclaimer linked at the bottom of this page. Consult with respective standards for final design decisions. IPC 2. 22. 1B is Copyright 2. IPC, Illinois ipc. All rights reserved.