Questions tagged [clearance]

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

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36 views

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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57 views

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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369 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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35 views

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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43 views

Altium's 'Ignore pad to pad clearances within a footprint' inside CircuitMaker?

This is a related question to Autoroute or not? I have an option enabled in the Autorouter of CircuitMaker (Rip-up Violations After Routing), to prevent getting illegal routings. See below. As you ...
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74 views

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

Introduction to the problem I use an OpAmp to buffer the output of an InAmp and to drive the input of an ADC, so the signal path looks basically like this: InAmp -> OpAmp -> ADC The device of ...
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50 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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2answers
62 views

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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146 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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222 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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142 views

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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472 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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49 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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413 views

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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77 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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323 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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327 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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305 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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3answers
135 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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469 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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1answer
65 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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2answers
429 views

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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1k 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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1answer
474 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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2k 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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153 views

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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1k views

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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101 views

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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199 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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1answer
106 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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2answers
260 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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45 views

THT decopling capacitor spacing from the TQFP uC's power pin

simple question - 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 ...
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403 views

Altium trace Clearance auto finder (based on ANSI / IPC-2221/IPC-2221A standards)?

I need to make one LED PCB Bord for lighting using SO i have designed my schematic into Altium designer V16, like this (single side ): So according ANSI / IPC-2221/IPC-2221A design standards for My ...
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513 views

Why does the IPC standard allow for smaller clearance on inner layers than external layers?

Why does the IPC standard allow for smaller clearance on inner layers than external layers? In this thread it is alleged that external layers are susceptible contamination. That makes sense with home-...
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2k views

How does trace/via clearance affect parasitic inductance if they go to the same net

After reading [Mike DeSimone]'s response regarding good decoupling and bypassing practices I kept wondering about distance between wires (wire = trace or net) . [Mike DeSimone] comments that wires ...
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2k views

Rotating components in Altium Designer, clearance

I can't find out how to properly rotate 45 degrees components in Altium Designer. I read two topics about that: Rotated component placement in Altium How can I rotate a part in Altium without an ...
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158 views

UL fire safety clearance requirement

The DUT is a relatively high-power LED driver driven by a SELV high-power +24VDC supply. It'll drive LED voltages up to 55V by specification. So everything is considered safe as far voltages are ...
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1k views

Altium Microstrip routing

I am currently trying to route a micro strip for a GPS and GSM antenna on Altium which got some constraints on spacing with ground poured plane like the one shown just below: This is currently my ...
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1answer
411 views

Clearance distance in a PCB with an insulated barrier

In the image shown below, why is the distance marked with "??" not considered for clearance? Is there a slot under that barrier, or does the barrier pass through the PCB?
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2k views

Will a cut or a slot in a PCB change clearance or creepage?

Does a cut or a slot in a printed circuit board increase clearance, creepage or both? Some say it will increase clearance, but I don't think clearance will change because, even with a cut in the PCB, ...
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1answer
4k views

PCB trace clearance in 220V circuit

This is a pcb layout where I am converting 220V rms to a DC voltage (for microcontroller). The pcb has severe size constraints. This is one design I could come up with: Circuit explanation: Consider ...
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2k views

How to measure creepage distance?

What points do you need to measure in PCB according to IEC 601? Is it the closest distance between any conductive parts? For example minimum air clearance for means of operator protection in secondary ...
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367 views

What is the common cause of short circuit in PCB design

In PCB design there is some clearance and creepage distances to respect according to the UL 60950 standard for example, I want to know why this distances need to be respected in PCB design, what is ...
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1answer
2k views

Ethernet LED & Diffpair Clearance

How do you maintain creepage distance between diff pairs and the LED terminals on an Ethernet connector? My understanding is that based on EN60950, for 250V IT equipment, the air clearance is 2mm and ...
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2answers
2k views

How much clearance through air is required for 10 kV DC?

Suppose I have two uninsulated connectors with 10 kV DC between them. How much clearance through air should I have between those connectors? What table is this found in?
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1answer
362 views

Eagle - clearance errors and display errors

I am beginning with eagle, I have not any experience with this program. Could you please tell me, what does it mean clearance error, overlap error and dimension error. How could I avoid it and remove ...
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397 views

How does a fuse affect creepage reqirements?

I am designing a mains-powered device that has to comply with IEC 60079-15 (Non-incedive industrial eqipment). Creepage distances in this standard are inherited from IEC 60664, pollution degree 3. For ...
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641 views

pollution degree and creepage distance

I read in some books that pollution degree can influence the creepage distance in electronic circuits, is there any relation (mathematical) between the pollution degree and the creepage distance.
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3k views

Clearance and creepage requirements in EU

I'm looking for the clearance and creepage requirements between live voltage (230V) and SELV (Safety Extra Low Voltage) in the EU. I had a look at this and other questions, but I rarely see numbers ...
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17k views

Cleaning PCBs… using water?

I found this video where a technician with a lot of experience seems to clean his PCBs using water, and then he just puts it in the sun so it can dry. I was just amazed to see the circuit keeps ...