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Questions tagged [clearance]

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

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Feasibility of Using Xinya XY2500 4-Pin Pluggable Terminal for Three-Phase PCB

I am designing a PCB for a three-phase system and considering using the Xinya XY2500 4-pin pluggable terminal connector (pitch 5.08 mm, rated 15A @ 300V) to connect R (Phase 1), Y (Phase 2), B (Phase ...
Shubham's user avatar
1 vote
1 answer
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Creepage and clearance in a dielectric fluid

I'm designing a DC low voltage system ( 1000VDC) with immersion cooling. I have been referring to EN 60664-1 to size clearance and creepage distance, but this standard is ok for air only. Is there any ...
PatAll's user avatar
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How to I set DRC rules for a specific BGA component?

I need to set the DRC rules for a BGA component. That's because JLCPCB have unique capabilities for BGA packages. In this case I need to have a unique clearance for my BGA component. I want to have ...
euraad's user avatar
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LED PWM traces splitting reference power plane adjacent to bottom 5V DC supply ground zone on 4-layer PCB

I have almost finished my first 4-layer PCB design using Signal(Top)-Ground-Power-Signal(Bottom) stack-up and have some questions before sending it to production. Due to the very tight space on the ...
Semih's user avatar
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2 votes
1 answer
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Question on IEC61010: Secondary circuit insulation requirement (creepage & clearance) [closed]

How does one decide if a particular isolation is required to meet creepage/clearance? Do all insulators have to conform to the creepage/clearance requirement? In my design, I have a receiver circuit ...
Cyclone1's user avatar
1 vote
1 answer
69 views

PTH Pad too close, how to resolve?

I have settled on this component for our spin dials: https://www.digikey.com/en/products/detail/cts-electrocomponents/292V1X24A/12091626 Problem is, in fusion pcb my pads nearly touch, while the holes ...
Wes Ellgass's user avatar
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2 answers
306 views

Altium: Exclude entire layer from Clearance Rule

I'm designing a PCB in Altium Designer. I've defined Clearance Rules for certain nets. When I run the DRC (Design Rule Check) I get errors that the Clearance between the Keepout and the Pad doesn't ...
puncher's user avatar
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Mixed pollution degree creepage distance

Say you need to comply with a creepage distance but you can't do it under a specific pollution degree. I had 2 scenarios where I had mixed pollution degrees: The creepage distance is almost enough ...
HatimB's user avatar
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Guidelines for component spacing [duplicate]

Are there any standard component clearance guidelines/rules/best practices (for SMD parts)? Or does one have to talk to the EMS every time for all the components' clearance? For example how close can ...
mr dude's user avatar
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Why is there a difference between pad-to-trace and trace-to-trace clearance?

I am looking to have a PCB produced for a personal project of mine. I have to use very thin traces and tight clearances to escape pads on a BGA chip on my board. I was looking at the capabilities of ...
elialm's user avatar
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Altium Designer 23 DRC Rule Creation: How do I set a special clearance rule for a TH Pad to SMD pad?

My issue: Because of wave and selective soldering techniques, I need an 8mm clearance for an SMD pad to a TH pad that is on the opposite side of a placed TH part. Here is the scenario to better ...
Experiment-626's user avatar
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Altium throws unjustly creepage violations

In my project, I have several rules set for creepage. I get 12 violations on this rule, but always between the polygon and a pad or via. This is strange because the polygon is drawn by Altium ...
hgerrebrands's user avatar
3 votes
3 answers
336 views

How to interpret External Clearance spec on HCPL3700M IC?

The spec for the HCPL3700M (AC voltage detection IC) lists an "External Clearance" of ≥7.4mm. Is this saying that no component or exposed trace should be within 7.4mm on any side of the chip?...
user272901's user avatar
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Clearance error on pin header solder pads in Eagle

I am getting a clearance error on the Sullins connector PPTC191LFBN-RC. I got the EDA models from Octopart. On including this model in my design I am getting a solder pad clearance error on both the ...
Soham Chakraborty's user avatar
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1 answer
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How can I set a clearance in my polygons? Because there is an error of short circuit between poly of GND or 5V and my vias

I tried to solve these errors using blind and buried vias, but the errors persist. I want when I repour the poly, it creates a clearance between the vias and poly. Or another solutions for the error. ...
Vladimir Villamizar's user avatar
6 votes
1 answer
178 views

Same net overlapping pads ok?

I'd like to keep the option between components with slightly different footprints. In this particular case it's tactile switches with either 6.5mm or 8mm distance between legs. It looks ok to me but I'...
sui's user avatar
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How can I disable hole to polygon clearance in Altium?

I have a polygon reaching to the outside of the board. There I want to place mousebites for the panel, but when they are placed, there is a clearance generated around the holes that I don't want: ...
Kreatronik's user avatar
3 votes
1 answer
89 views

When does UL allow a user to access the a metal component connected to AC MAINS through a Y capacitor?

This is a 1kV SMPS design and it is considered a PRIMARY CIRCUIT by UL because it connects directly to 120V AC MAINS. It does not expose its 1kV output directly to the user, but uses the voltage ...
Derek Tables's user avatar
7 votes
3 answers
952 views

What are good values for standard design rules (like clearance, trace width, etc.) in PCB design?

I am working on a project for LED control with MCU and LED drivers. I have an input voltage of 24 V and a DCDC converter to 3.3 V for the MCU. Each LED controller will have an output current of 1 A. I ...
Urban's user avatar
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1 answer
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Typical filled zone clearance

What are typical clearance settings for a filled zone (GND) on a PCB with 3.3V and 12V voltages? Is 0.25mm enough?
TWT's user avatar
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9 votes
2 answers
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What is a correct method to measure safe maximum voltage of a PCB?

I have a small (24 x 15 mm) PCB for a custom connector. It is intended for low voltage (< 48 VDC) applications, but I am interested in measuring it in order to provide customers a reasonable ...
JYelton's user avatar
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3 votes
1 answer
1k views

Creepage between layers on a PCB

I'm currently designing a power supply with high isolation between primary and secondary sides and have to comply to standard distances on clearance and creepage. My question is regarding creepage, I ...
anzorein's user avatar
3 votes
4 answers
2k views

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 ...
Ashutosh Jha's user avatar
1 vote
1 answer
760 views

Altium designer clearance constraint between track on top layer and pad on top layer

I am a student and I want to design a PCB. I am using Altium Designer 22. I selected 0.5 mm for the clearance constraint rule, but I got an error. If I select 0.3 mm I still get the same error. How ...
Aiakon's user avatar
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529 views

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 ...
Noj911's user avatar
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1 vote
1 answer
2k views

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 ...
saurabh kandalkar's user avatar
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2 answers
300 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 ...
user139731's user avatar
3 votes
1 answer
1k 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 ...
TripleAntigen's user avatar
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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 ...
Thomas Ferreira's user avatar
1 vote
1 answer
1k 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 ...
johny adv's user avatar
2 votes
1 answer
729 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 ...
johny adv's user avatar
1 vote
1 answer
458 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 ...
SKGadi's user avatar
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377 views

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 ...
Steevo's user avatar
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1 vote
1 answer
393 views

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 ...
cdubs's user avatar
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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 ...
MMmmm's user avatar
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2 answers
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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. ...
N. Berg's user avatar
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0 answers
312 views

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 ...
BBridges's user avatar
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2 answers
1k 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 ...
Bavly's user avatar
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6 votes
2 answers
846 views

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 ...
Ivan Voras's user avatar
1 vote
0 answers
475 views

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 ...
K. Hama's user avatar
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0 votes
0 answers
248 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 ...
Isacco's user avatar
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3 answers
4k 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 ...
Felix Kunz's user avatar
5 votes
3 answers
2k 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 ...
HatimB's user avatar
  • 896
1 vote
0 answers
76 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 ...
Caesar Knight's user avatar
0 votes
1 answer
445 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 ...
florian_aust's user avatar
2 votes
2 answers
533 views

Proper implementation of creepage and clearance on high-voltage PCB

I am designing a 3-phase 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 ...
Nexy_sm's user avatar
  • 409
1 vote
2 answers
278 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 ...
IntiEngineer's user avatar
6 votes
1 answer
690 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 ...
Suvi_Eu's user avatar
  • 851
3 votes
5 answers
1k 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. ...
Suvi_Eu's user avatar
  • 851
0 votes
1 answer
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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 ...
kellogs's user avatar
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