Questions tagged [clearance]

Clearance denotes the shortest distance between two conductive parts as measured through the air.

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How to measure distance between two pads' solder-mask clearance in Altium

I'm new to Altium and want to measure distance between two pads' solder-mask clearance using Reports-->Measure. I tried activating solder-mask layer only and then tried to measure like regular ...
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Altium designer clearance constaint Between track on toplayer and pad on toplayer

I am a student and i want to design a PCB. I am using Altium Designer 22 and I selected 0.5mm for clearance constaint rule but i got this error. If i select 0.3mm i still got the same error. How can i ...
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EN 61010 Creepage and Clearance questions

My PCB has to meet EN 61010 safety standard and i had a question regarding creepage and clearance values. Has anyone got any experience applying this standard and when the creepage and clearance ...
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Altium - Clearance of a Polygon in Bottom Solder Layer

I created a polygon in the bottom solder layer , but it does not observe any clearance I even defined the rules specifically, but it does not work rules specifically I want it to be like this ...
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Trace clearance and creepage distance between similar high AC voltage paths

In my project I need to control 2 relays from ESP-12E, I have isolated AC & DC side in my PCB design by 4mm PCB Material : FR4, with general Silkscreen coating (green polymer coated) According to ...
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102 views

PCB clearance/creepage with dead metal

I have PCB design where there are two pads the may be shorted (manually in assembly) or left as is, depending on the product model. The through hole circular pad is actually for a terminal block. I ...
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117 views

Altium - Hole to hole clearance rule that only applies when nets are not the same

Our PCB manufacturer specifies that there should be a minimum clearance between holes of 0.5mm when nets are different. I am getting a lot of errors when I have thermal pads with embedded vias closer ...
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Polygon repour clearance rule

I have some trouble editing a project, I had to replace some footprints on a board and thus rebuild polygon planes on top. As you can see on the first picture, after rebuilding the polygon, the shape ...
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1 answer
135 views

How can I set clearance based on IPC-2221?

Below are two pictures. The first picture is from IPC-2221. I made the second picture. Which categories do the L1, L2, L3 and L4 clearances in the second picture belong to in the first picture at 310 ...
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2 votes
1 answer
119 views

How should the clearance calculation be on a coated PCB?

How many mm should the clearance be between the A and B pads in the picture below? And clearance between C pad and D pad? And clearance between E pad and F track? And clearance between F track and G ...
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74 views

Galvanically isolated voltage PCB track clearance requirements

I am designing a PCB to switch high voltage (440VAC) from a microcontroller. In this project, the 440VAC voltage is galvanically isolated from the microcontroller circuit. I am using an opto-coupler ...
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61010-1 Clearance Distance from PCBA to Enclosure Wall

I am having some difficulty regarding the interpretation of 61010-1:2010 with regards to spacings. I think this is more of high level question/s at this point. Summary of Problem Scenario I am placing ...
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Creepage and Clearance for Connectors

I’m looking to mount SMT pogo pins on a PCB. The connectors will see a maximum working voltage of 120VDC between any two pins, but only when connected to their corresponding female header. If the ...
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IEC 60664-1 clearance between phase and earth

With IEC 60664-1 you require clearance between phase and earth. But if you have a resistor voltage divider between phase and earth do you need the same clearance between the pads of the resistors? Or ...
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6.6kV digital isolator pad clearance

I was wondering about digital isolators. I have some temperature sensors installed inside the windings of a 6.6kV motor. I would like for my system to not be completely destroyed in case of a short. ...
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Altium 21.1.1 - Disable component clearance

I'm royally confused! I have Altium 20.x.x on one PC. I do a PCB design on this PC and I have no issues. I port that same project to Altium 21.1.1 and suddenly I have major clearance issues when I go ...
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381 views

Minimum spacing between PCB components

I am laying out a 2-layer PCB that has only through hole components, and I need it to be as small as possible. I was wondering how small I can set the clearance rule between the components? When I ...
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Maintaining clearances in HV MOSFET footprints

I'm thinking of making a prototype PCB which would use a bridge rectified AC, which will end up with peaks around 350V in my area (+/- some smoothing). It's a through-hole design and the circuit will ...
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Trace clearance for 500V insulation test

Part of my job is to measure insulation resistance of cables using a tester, such as a Fluke 1587. We measure insulation resistance at 500 VDC. We have to measure insulation resistance pin to pin and ...
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Track clearance with flex region cutout in Altium Designer

In Altium Designer, I created a simple rigid-flex board with the 4 layers in the rigid part (top, in1, in2, bottom) and 2 layers in the flexible part (in1, in2). I set 5mm clearance on a top layer ...
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Altium Collision DRC error? Cant figure out why

i have finished my PCB design with Altium. I ran the DRC, to check if there are any errors. Strangely i got like hundreds of errors. First i couldn't find out why, but i managed to narrow it down to ...
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3 answers
833 views

Why does increasing altitude (low air pressure) results in lower resistivity/ breakdown voltage?

I got this question because the creepage and clearance distances need to be adjusted for altitude. The higher the altitude, the higher the distances should be. It seems to me however that the contrary ...
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Heatsink Crossing Primary and Secondary Sides in Switched-Mode Power Supply

I've taken apart a non-oem laptop power supply. There is clearance on the board between primary and secondary. However, they've placed a single heatsink across the board for the primary and secondary ...
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243 views

Pads very close together, no space for guard ring? What should I do?

Introduction to the problem I use an op amp to buffer the output of an in amp and to drive the input of an ADC, so the signal path looks basically like this: in amp -> op amp -> ADC The device ...
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129 views

Proper implementation of creepage and clearance in high voltage PCB

I am designing a 3phase voltage detector based on optocouplers as shown below: simulate this circuit – Schematic created using CircuitLab For this I need to follow DIN 60664-1 and my biggest ...
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2 answers
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Clearance of Exposed Nodes on High Voltage Relay

I'm trying to use this high voltage relay for a machine that will assist in HI-POT tests. The relay can handle about 10kVpeak according to the datasheet and I need it to handle 3.5kVrms maximum. I've ...
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6 votes
1 answer
372 views

Barrier and slot within reduced area on a PCB

Imagine this situation in a little area of your PCB: According to the worst case and used material, I need a creepage distance = 30mm. According some tables, clearance must be 30mm. First Red banana ...
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5 answers
540 views

When to use slots instead of barriers in high voltage design?

I have read a lot of information about the clearance and creepage strategies, distances, materials, etc.. I am designing my first HV PCB, main LV circuit will be on TOP and HV (6KV) on the bottom. ...
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crossing 240 V traces on both top and bottom sides of a 2 layer PCB

My situation is the same as the crossings encircled in white from Can I place 220V Live traces on top and bottom of PCB? Therefore, running Line traces on the top layer and Neutral traces on the ...
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1 vote
1 answer
2k views

Altium: how to assign a net class to unconnected pins?

I have PCB with a clearance rule for nets that can be exposed for higher voltages: In the schematic I put a blanket around the area I need to be assigned as higher voltages nets (I called this class "...
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59 views

Clearance distance and resin filler

I'm designing a circuit to detect presence of AC line voltage. It's actually a very simple device with AC side made up of a 200Kohm 1W resistor and an optocoupler and a protection diode. There will be ...
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2 answers
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Constrain plane clearance from annular ring in Altium

I need to constrain a plane from shorting to the annular rings of a number of vias. The dialog found at ...
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2 answers
167 views

Isolating main power traces on backside of the PCB

I am currently making a build-in PSU for my own audio-effect-rack-thing. The internal PSU consists of two print-transformers(THT), one for 6VAC and the second one for 9VAC. These are also pretty low ...
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2 votes
1 answer
685 views

UL 840 clearances

The table 8.1 in UL840 doesn't consider clearances for voltages less than 50V (for example). I have to use a clearance of 0.2 mm on the PCB for the case of overvoltage category 1 and pollution degree ...
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2 votes
2 answers
1k views

Maximum allowable voltage between PCB traces

I have some confusion regarding the guidelines for clearance between surface uncoated PCB traces (specifically component pads). IPC-2221 guidelines and other guidelines and standards indicate spacings ...
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6 votes
2 answers
545 views

High Voltage Capacitor Lead Clearance

I am designing a high voltage board, 10,000 VDC. I wish to use a suitably rated capacitor such as the DHR4E4A102K2BB. When I have been studying the ...
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1 vote
3 answers
284 views

Electrical isolation problems when routing between pads of SMT resistors/caps

According to answers to this previous question, routing traces between the pads of SMD caps/resistors, as shown in the picture, is not dangerous as long as trace to pad clearances are obeyed and the ...
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1 vote
2 answers
681 views

Creepage distance over pcb

How to measure creepage distance over pcb ? Is creepage and clearance distance measure by pbc layout or soldering?
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3 votes
1 answer
71 views

Insulation of SiC Diode

I am reading about creepage distance and clearance and came across a T0-247-3 SiC diode (IDW20G120C5B). This diode is rated for 1.2kV which would mean that it won't break down at let's say 800V, which ...
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2 answers
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Cleaning up GND/PWR-plane air wire errors in EAGLE + bonus questions

So I've just finished up my first complete PCB board. The layout is 4-layer based, set up as ((1*2)*(15*16)) ---not sure if it should be ((1+2)*(15+16)) or ((1*2)+(15*16)) instead, please advise--- ...
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2 votes
1 answer
3k views

KiCAD Component Pad Clearances

I'm using KiCAD version 5, and I have an issue with it. Previously, I've been using OrCAD up until the point to where I needed multiple layers for my board. So, I redesigned my components, but I'm ...
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2 votes
1 answer
733 views

Altium individual clearance for polygonpour

I want to use a poured plane in my design, but i need more clearance on the bigger pads. If i increase the clearance in the rules, all the spaces between pads, will increase. Is there a way to specify,...
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6 votes
2 answers
4k views

How is clearance affected by altitude (air pressure)?

Let's say you have a high-voltage circuit (or any voltage really) and you want to provide appropriate clearance distance for the PCB, connector pins, etc. (Above image from link) There are standards ...
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Creepage and clearance of through hole resistor

Recently I found a resistor broken on a PCB. It is a MOF type 1/2W through hole resistor. I found that the resistor is directly placing (touching) on a PCB Live trace and I know that the potential ...
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1 answer
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minimum trace spacing error

A PCB made with KiCad has a configured clearance of 0.152 (6mil) but when I send it to JLC site I have this warning: "Attention please, the minimum trace spacing is out of our capability, your order ...
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1 vote
1 answer
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What's the name of the Altium designer rule that warns if component "enters" another component area (PCB)?

The trouble is that this PCB is a capacitive pad and needs to stay inside the other component square area. What's the Altium rule to exclude this component?
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2 votes
0 answers
238 views

Becoming crazy with EU LVD regulation in PCB and electric strength

First of all I will explain the design characteristics of my project to make clear what it is and where it enters for regulation. It is a fixed electric/electronic installation in offices so it can'...
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5 votes
1 answer
147 views

TO-277A Package Rated for 1000V

I'm looking at using the following part, S4PM: Datasheet The part has a Vrrm of 1000V. The mounting pad layout shows a separation of 0.81mm between cathode and anode. This is well below IPC2221B ...
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3 votes
2 answers
316 views

Clearance Distance measurement

It is a snapshot from an AC/DC converter. do I need to consider "dist. 1" or "dist. 2 at" the below image to measure the correct clearance space.The caps are both Electrolytic that have an aluminum ...
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THT decoupling capacitor spacing from the TQFP uC's power pin

How close can the uC's power pin (TQFP pad) and a ceramic cap's PTH pin can get so the PCB fabrication process or later exploitation would not go wrong? Some ballpark figures for common equipment ...
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