Buffered MOSFET Output Driver

flux

1:33

Thought for 3 sec

Search docs: How to set thermal relief on a specific pad using selector-based layout rules, and why thermal relief may not appear in Flux.

Read layout.

In your layout, C24 P1 is still computed as “Direct connect,” so your #C24 #P1 ruleset is not taking effect on that pad, or there is no same-net fill touching it to show the effect. Try targeting it more specifically as #C24 pad#P1, then set Thermal Relief = Relief Connect; Flux docs say: “Relief Connect: places an air gap between the pad and the fill and connects them with conductors. Direct Connect removes the air gap, allowing the pad and the fill to be fully in contact.” Source
sevimuelli

sevimuelli

i have a coper fill for GND on the top layer and many pads are connected to this. if i wouldn't do a thermal relief on those, could this be an issue in the reflow oven or would it be ok?

flux

0:23

It can be an issue: pads tied directly into a large GND copper fill can heat more slowly during reflow, which may cause poor wetting, tombstoning on small passives, or uneven solder joints; thermal relief is generally recommended for ordinary SMT pads connected to pours, and your DRC guidance also treats thermal relief on pour-connected pads as a manufacturing check .
It’s usually OK to use direct connect only where you intentionally want heat spreading/current capacity — e.g. thermal pads, high-current power pads, heatsinking tabs, or parts where the datasheet/layout guidance wants maximum copper. For normal capacitors/resistors/signal pads on your top GND pour, I’d use thermal relief unless you have a specific thermal/current reason not to.
Check direct GND pads
Identify direct exceptions
Thermal relief settings
Review soldering risks
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Only difference to RotoToolboard: Fan 3: out3tach -> Pin 33: IO\_2
sevimuelli

sevimuelli

Only difference to RotoToolboard:
  • Fan 3: out3tach -> Pin 33: IO_2
27d
1
V_IN
OUT_1_TACHO
OUT_0_NEG
OUT_1_NEG
J1
Pin Description
OUT_0
J14
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Duet3D Delta Toolboard

Duet3D Delta Toolboard thumbnail
A tool board for Delta 3D printers to connect to the Duet3D system. All connected through a single power and CAN cable.

Properties

3D Printer Toolboard

24V

Consumer Electronics

1.6

mm

LCSC

5

Pricing & Availability

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Qty 1

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$12.28–$13.43

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$6.95–$7.11

Mouser

$26.02

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$2.52–$2.56

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$4.21–$62.88

Controls