Solder Alloy and Diameter

63/37 is eutectic: it goes from liquid to solid in one step, so joints don’t go grainy. A 0.031 in (0.8 mm) wire suits headers and most through-hole work.

No-Clean Flux

Flux removes oxide so solder wets the pad. No-clean types leave a safe, non-conductive residue, so you don’t have to wash the board.

Wick Width

Match braid width to the pad. Narrow braid for SMD pins and module castellations, wider braid for through-hole pads and connectors.

Tip Care

A dry brass cleaner keeps the tip hotter than a wet sponge, and tinner rescues a tip that has turned black and stopped wetting.

Fume Control

Flux smoke irritates eyes and lungs. A carbon-filter extractor beside the work pulls it away from your face.

For through-hole parts, a pump clears a hole faster than braid. The SS-02 is different from the usual plastic plunger pumps: its tip is a flexible, heat-resistant silicone tube that you press right against the iron and pad, so it seals well and pulls the solder out in one go. The small aluminium body works one-handed, which makes it great for pulling header pins off an ESP32 board, removing a relay or freeing a mis-soldered USB connector. The silicone tube wears with use, so it’s worth having a spare.

Rosin smoke rises straight into your face when you lean over a small board. The Hakko FA-400 sits beside the work and draws that smoke through an activated carbon filter. It’s a small, quiet fan unit with an ESD-safe static-dissipative housing, and it can stand upright or tilt to aim at the joint. Filters are cheap and easy to swap. It’s a bench fan with a filter, not a ducted lab system, so keep it within a few inches of the iron for best results.

When a tip turns black and solder balls up instead of flowing, it’s oxidised. Before you throw it away, dip it in tip tinner. The TMT-TC-2 is a compressed tablet of pure tin with an ammonium phosphate formula in a 20 g metal tin: touch the hot tip to it, wipe on brass and the tip usually wets again. It’s lead-free, works with no-clean processes, and a self-adhesive pad on the base stops it sliding around the bench. It works with any brand of iron, including TS101, Pinecil and Hakko tips.

Flux paste in a syringe is the most useful bottle-sized fix on a bench. MG Chemicals’ 8341 is a no-clean paste that meets J-STD-004B ROL1, works with both leaded and lead-free alloys and leaves a clear, non-conductive, non-tacky residue, so most boards can be left as they are. Put a dab on an ESP32-S3 module’s pads before drag soldering, on a bridged USB-C connector or under braid when desoldering. The 10 mL syringe comes with a plunger and dispensing tip for precise dots.

7. Chip Quik SMD291 Tack Flux (10 cc)

The flux many rework techs swear by. SMD291 is a thick, tacky no-clean flux in a 10 cc syringe with plunger and tip. Its stickiness holds small parts in place while you solder, and it stays active long enough for hot air work and drag soldering fine-pitch pins. Pair it with our hot air rework station picks when replacing ESP32 modules.

8. Hakko 599B Wire Tip Cleaner

A wet sponge chills the tip every time you wipe it. The 599B uses coiled brass wire instead, needs no water, and has a dome-shaped holder that cuts down on solder splash. Hakko adds flux to the wire to slow tip oxidation, and it’s especially good for lead-free solder. Replacement wire is sold separately.

9. Kaisi S-160 Silicone Soldering Mat

A 17.8 x 11.8 in heat-resistant silicone mat that protects your desk from drips, hot tips and hot air. A magnetic area holds screws, and small compartments keep jumpers, modules and SMD parts from rolling away. Note that silicone is not an ESD mat, so ground yourself when handling bare modules.

Just bought your first iron?

Kester 44 + MG Chemicals 8341 + Soder-Wick 80-2-5.

Doing lots of repairs?

Add the Engineer SS-02 and Chip Quik SMD291.

Tips wearing out fast?

The Hakko 599B plus TMT-TC-2 tinner.

Soldering for hours?

The Hakko FA-400 and a Kaisi S-160 mat.

Should I use leaded or lead-free solder for ESP32 projects?

For hobby work, 63/37 leaded solder is easier to use and forgives a cooler iron. Lead-free (such as SAC305) is required for products sold in many regions and needs a hotter tip and more flux. Both work fine on ESP32 boards; don’t mix them on the same joint.

If my solder has a flux core, why buy extra flux?

The core flux burns off within a second or two. Reworking a joint, drag soldering module pins or desoldering with braid all need fresh flux, which is why a syringe of no-clean flux fixes so many problems.

Do I need to clean no-clean flux off the board?

Usually not: the residue is designed to be non-conductive and non-corrosive. Clean it with isopropyl alcohol if heavy residue looks messy, sits near RF antenna areas or will be under a conformal coating.

Wick or solder sucker: which do I need?

Both if you can. A sucker clears through-hole joints quickly; wick is better for SMD pads, bridges and the last thin film of solder a pump leaves behind.

Is a fume extractor necessary for occasional soldering?

For a few joints, an open window and a small fan pulling smoke away may be enough. If you solder often or for long sessions, a carbon-filter extractor beside the work is a worthwhile upgrade.