I am wondering if there exists a conductive glue that replace soldering for small SMD components like 0603 packages ?

 

Sort of if you include solder paste.

 

https://www.amazon.com/Sciplus-Electrically-Conductive-Soldering-Wire/dp/B000Z9H7ZW/ref=sr_1_3
It has a 3.7 stars out of 5 stars rating.
Personally I wouldn't approach a fix like this unless my name was Angus MacGyver. But then we don't know what your goal is. If you want to repair a circuit board, say - solder an 0603 component on to a board (for reasons you only know) I'd suggest getting a good iron with a fine point. But even soldering a small component like that using an iron is very tricky. One MY shaky hands could no longer accomplish. I'd opt for using a hot air soldering pencil, capable of applying a stream of hot air to a very localized point. But they're expensive AND if you are not used to using them you could end up melting other components or disturbing solder on other components.

If we knew your goal we could offer suggestions based on that. But I'd recommend staying away from conductive glue except in special circumstances.

 

Sort of if you include solder paste.

Thanks for reply.

 

replace soldering

Wave soldering or hand soldering?

ak

 

... for small SMD components like 0603 packages ?

0603 is not that small. i use it routinely and often without aid of microscope or magnifiers. 0402 is harder but challenge is 0201 and smaller ... down to 008004

 

AT one location the folks there suggested using carefully applied solder past, and their hot-air reflow soldering machine. That scheme, without the production setup to do it properly, was a total waste of time and components. So I used a pointy soldering iron and a good magnifier and tweezers and assembled three prototypes, all of them worked. The only hard part was a single 01008 diodethat was difficult to keep aligned.

 

Bump solder rework with tacky flux and hot air reflow. Put Kapton hi-temp tape around the part to keep the heat off other components.


https://forum.allaboutcircuits.com/threads/how-to-solder-this-ic-i-ss-on-the-pcb.178035/post-1623235

 

Generally speaking, conductive adhesives are unable to compete with solder and are only used when solder is simply not an option. I doubt they have ever been used to attach SMDs, it's just untenable. The table below might give you some insight into why,

Solder vs. Conductive Adhesives for SMT

Name / Type	Composition	Electrical Conductivity	Temperature Resistance	Approx. Cost	Longevity / Durability	One-part or Two-part	Application Requirements	Consumer / Industrial
Sn63/Pb37 Solder [1]	Eutectic metal alloy 63% Sn, 37% Pb	~6–7 × 10^6 S/m (~1.5 × 10^-6 Ω·cm)	Melts at ~183 °C; Solid up to ~150 °C	Very low (~$0.02–0.10 per g)	Excellent (decades-long joint life; true metallurgical bond)	N/A (solid alloy)	Requires heating to ~183 °C (solder iron or reflow); no cure time	Widely available (consumer & production)
Silver Conductive Epoxy (MG 8331) [2]	Epoxy resin filled with silver particles	~0.0005–0.005 Ω·cm (resistivity) (≈10^4–10^5 S/m)	Typically –40 °C to +120 °C; short-term up to ~150 °C	High (~$3–5 per g)[	Good for ~5–10 years; not as robust under repeated thermal/mechanical stress	Two-part (resin + hardener)	Mix (1:1); pot life ~5–15 min; cures in 4–24 hrs (faster with heat)	Consumer & Industrial (prototyping, small SMD fixes)
Silver Conductive Epoxy (Loctite 3880) [3]	Epoxy with silver filler	~0.0002–0.001 Ω·cm (resistivity) (≈10^5 S/m)	–55 °C to +150 °C continuous; cure ~150 °C; stable up to ~200 °C short-term	Very high (~$10+ per g)	Excellent durability (high reliability in industrial settings)	One-part (pre-mixed)	Oven cure recommended (1–2 hrs @ ~150 °C)	Industrial (Henkel distributors; used in production)
Silver Conductive Paint (Defogger Repair) [4]	Acrylic lacquer with silver flakes	~0.02–0.05 Ω·cm (air-dry film)	~–20 °C to +90 °C (automotive interior range)	Moderate (~$1–2 per g; kits ~$15)	Moderate (years in indoor/auto use; can degrade in moisture/vibration)	One-part (solvent-based)	Apply & air dry (about 1 hr); no heat or mixing	Consumer product (auto parts, Amazon; quick fixes)
Carbon-Based “Wire Glue” [5]	Water-based adhesive with graphite	Low conductivity (~0.5–5 Ω·cm) (very high resistivity compared to silver epoxy)	~0 °C to +70 °C (softens at higher temps)	Low (~$0.20 per g; jar ~$5–10)	Poor (brittle upon drying; prone to cracking, not suitable for critical joints)	One-part (air-dry)	Apply thick layer; air-dry for hours; no special tools needed	Consumer hobby; only for low-end or temporary repair

NOTES

[1] Sn63/Pb37 Solder
• Kester and other brands; datasheets vary by manufacturer.
• Example SDS: Lead Solder Wire SDS.
• Typical purchase: Kester 63/37 solder on Amazon, or electronics distributors (DigiKey, Mouser).

[2] MG Chemicals 8331 Silver Epoxy
• Technical Data Sheet.
• SDS.
• Available at Mouser or Amazon.

[3] Loctite 3880 Silver Epoxy
• Henkel TDS.
• Available from industrial distributors (Ellsworth Adhesives, DigiKey).
• Often used in high-reliability settings (military, aerospace).

[4] Silver Conductive Paint (Rear-Window Defogger Repair)
• Example brand: Permatex Kit.
• Good for reattaching small tabs, short conductor lines.
• SDS & instructions: Permatex official site.

[5] “Wire Glue” (Graphite Conductive Glue)
• Often sold under various brand names (Anders Products, etc.).
• Typical listing: Wire Glue on Amazon/eBay.
• No official datasheet beyond basic instructions on packaging.