PCB Unlimited is a leading distributor of solders and related materials for electronics assembly. Whether you require lead free or leaded solders in solder wire, solder paste or solder bar form, we offer extensive products from leading solder manufacturers.

Solder Paste

Solder paste is available for immediate delivery in 250 gram jars and 30 gram syringes:

  • Leaded No Clean & Water Soluble Solder Paste
  • Lead Free No Clean & Water Soluble Paste

To help us meet your specific needs, please provide us with information on your alloy, flux type, powder size and packaging preferences.

M8 SN63/PB37 T4 NO CLEAN SOLDER PASTE
An evolution of the highly successful NC258 platform, M8 brings no clean solder paste performance to the next level. Developed in combination with T4 and finer mesh leaded alloy powders, M8 provides stable transfer efficiencies required for today’s UFP and umBGA devices, reducing DPMO on the most challenging applications. A novel activator system provides powerful, durable wetting action accommodating a wide range of profiling processes and techniques. M8 activators will reduce wetting related defects such as HiP (head-in-pillow) and provide smooth shiny joints. M8 has reduced BGA and BTC voiding to as low as <5% on BGA and <10% on BTC ground pads.
Clock fast Lead Time: In Stock Money orange $20.00
M8 SAC305 T4 No Clean Lead Free Solder Paste
An evolution of the highly successful NC258 platform, M8 brings no clean solder paste performance to the next level. Developed in combination with T4 and finer mesh leaded alloy powders, M8 provides stable transfer efficiencies required for today’s UFP and umBGA devices, reducing DPMO on the most challenging applications. A novel activator system provides powerful, durable wetting action accommodating a wide range of profiling processes and techniques. M8 activators will reduce wetting related defects such as HiP (head-in-pillow) and provide smooth shiny joints. M8 has reduced BGA and BTC voiding to as low as <5% on BGA and <10% on BTC ground pads.
Clock fast Lead Time: In Stock Money orange $25.00
WS488 T4 Water Soluble Solder Paste
AIM’s WS488 water soluble paste has been designed to wet virtually any solderable electronic surfaces, components, assemblies, and substrates. WS488 is compatible with all leaded and lead-free alloys, and has been developed for use in a wide range of applications.
  • Alloy Sn63/Pb37 MP=183°C
  • Large Process Window
  • Excellent Wetting
  • Stencil Life > 8 Hours
  • T4 in stock and ready to ship
Clock fast Lead Time: In Stock Money orange $20.00
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Wire Solder

Wire solder is available for immediate delivery in 015" and 0.31" wire diameters.

  • Leaded No Clean & Water Soluble
  • Lead Free No Clean & Water Soluble

Core wire solder is available in many alloys, including lead-free formulations. Core wire is typically packaged in one pound rolls but other packaging is available upon request.

Kester Wire Solder, Sn63/Pb37, # 331 Water-Soluble Flux, 1-lb. Roll
Kester Formula #331 is a high-activity, water soluble core flux for soldering difficult metals on printed circuit boards. It exhibits the same fast action and mild properties as Kester's popular 2331-ZX neutral organic water soluble liquid flux. The flux is more heat stable than most organic fluxes, resulting in minimal smoke and odor. Its residue can be completely removed with a simple water rinse.
  • Sn63Pb43 Alloy
  • .015" and 0.031" Wire Diameters
  • #331 Water Soluble Flux
  • #66 Flux Core Size
Clock fast Lead Time: In stock and ready for shipment Money orange $40.00
Kester Wire Solder, Sn63/Pb37, # 245 No-Clean Flux, 1-lb. Roll
Kester 245 No-clean Cored Wire was developed to complement low residue liquid fluxes being used by the electronics industry. The chemistry is based on some of the same principles that have been safely used for years in mildly activated rosin fluxes.
Clock fast Lead Time: 3 Days Money orange $43.86
POWER CORE WS101 Wire Solder
POWER CORE WS101 wire solder is a high activated water washable for repairing through-hole, mixed and surface mount assemblies. The flux core provides faster and better fluxing activity than RA flux cores. WS101 flux is formulated to provide high activity soldering, leaving an easily washable residue in plain water without the need for cleaning additives.
Clock fast Lead Time: In stock and ready for shipment Money orange $45.00
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Bar Solder

Bar solder available for immediate delivery in in 25-pound boxes.

Our bar solder meets today’s electronic manufacturing processes by providing a strong and reliable solder joint. Less dross, fewer bridges, and more reliable solder joints mean increased production efficiencies and improved return on your solder investment.

Nitro-Flo Plus Bar Solder (63/37 Tin/Lead)
Nitro-Flo Plus bar solder goes through a manufacturing process that yields a bar that will produce the lowest dross levels during soldering operations which is ideal for the printed circuit board process.
  • Alloy Pure 63/37 Tin/Lead
  • Low Dross Level
  • Melting Point: 177°C/350°F
  • Available in 50 Lb box
Clock fast Lead Time: 3 Weeks Money orange $1,250.00
SN100C Lead Free Bar Solder
SN100c Bar Solder unique's properties make it possible to achieve high productivity in soldering for the printed circuit board process offering cost effective reliable joints.
  • Alloy Sn-Cu+Ni
  • Spread Factor is 77-78%
  • Melting Point:227°C/450°F
  • Available in 25 Lb box
Clock fast Lead Time: 3 Weeks Money orange $940.00
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