X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Virus-Scanned: Debian amavisd-new at mail.linetec.nl To: geda-user AT delorie DOT com From: "Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" Subject: [geda-user] Maximum current for thermals? Message-ID: <5244f7b5-c5d7-33ec-cd8a-c16d0595d7bb@linetec.nl> Date: Wed, 15 Jan 2020 16:47:14 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id 00FFlp0Z008976 Reply-To: geda-user AT delorie DOT com Hello, I have a hopefully simple question: I'm putting a 16A terminal block in a ground plane, with Ø 3 mm solder pads and a 1.3 mm hole (0.85 mm annulus width), with 0.2 mm clearance. Copper thickness is 0.035 mm (~1.5 mil) Connection with a thermal gives 4 connections with a width of 0.2 mm each, same as the clearance. This seems a bit skimpy, so I usually make these high-current connections without thermals. Still, I wonder what the approximate current capacity of these thermals is? I know from experience that a few amps is no problem at all, but I'm pretty certain that they'll fail upwards of 25A or so. If possible, I prefer thermals for easier soldering, so a more accurate estimate of the limits would be appreciated. Best regards, Richard Rasker