I would agree with Dan, looks like a notation for a heatsink.
The pinout looks like a surface mount MOSFET so I would guess the meaning as "requires heatsinking / thermal spreading as part of PCB structure" If part of a DC/DC converter or power supply this is a good way to connect a high dV/dt node to one plate of a capacitor! Welcome to the wonderful world of engineering compromise - EMC or thermal performance? All the best James James Pawson Managing Director & EMC Problem Solver Office hours: My mornings are reserved for full attention on consultancy, testing, and troubleshooting activities for our customers' projects. I am otherwise contactable between 1300h to 1730h from Monday to Friday. For inquiries, bookings, and testing updates please send us an email on [email protected] <mailto:[email protected]> or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy <http://www.unit3compliance.co.uk> www.unit3compliance.co.uk | <mailto:[email protected]> [email protected] +44(0)1274 911747 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 From: Dan Roman <[email protected]> Sent: 02 March 2023 22:28 To: [email protected] Subject: Re: [PSES] Can anyone tell me what this symbol means? Maybe that the heatsink is connected to the drain? Dan From: Doug Nix [mailto:[email protected]] Sent: Thursday, March 2, 2023 4:53 PM To: [email protected] <mailto:[email protected]> Subject: [PSES] Can anyone tell me what this symbol means? Colleagues, I came across the eyelash-like symbol above the MOSFET in the image below, and I am at a loss for what it represents. My searches of schematic symbol databases has come up dry as well. Anyone know what this means? Doug Nix [email protected] <mailto:[email protected]> +1 (519) 729-5704 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected] <mailto:[email protected]> > All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[email protected] <mailto:[email protected]> > _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected] <mailto:[email protected]> > All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[email protected] <mailto:[email protected]> > _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
