Sn42Bi58

Low Temp Solder Balls

Sn42Bi58 Low Temp Solder Balls

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Sn42Bi58 Low-Temperature Solder Balls

Sn42Bi58 solder balls are a lead-free, low-temperature tin-bismuth eutectic alloy that melts at 139 °C, used for BGA and CSP ball attach on heat-sensitive components and for step-soldering processes. EasySpheres supplies Sn42Bi58 solder spheres in multiple diameters, in conformance with IPC J-STD-006, with a Certificate of Conformance on every order.

Sn42Bi58 Solder Sphere Specifications

  • Alloy: Sn42Bi58, eutectic tin-bismuth, lead-free
  • Applications: Low-temperature BGA and CSP ball attach, heat-sensitive components, step-soldering, BGA rework
  • Melting point: 139 °C (eutectic)
  • Stock diameters: 0.050 mm to 0.889 mm range; listed diameters on this page run from 0.125 mm to 0.760 mm, each with its own part number
  • Dimensional tolerance: Maximum dimensional tolerance ±4% (typical measured ±0.50% for 0.050 to 0.450 mm, ±1% for 0.500 to 0.550 mm, ±0.83% for 0.600 to 0.889 mm); sphericity deviation less than 1.5%; inspection illuminance greater than 270 lux.
  • Quality: Alloy purity in conformance with IPC J-STD-006 (composition per J-STD-006C); Certificate of Conformance ships with every order.
  • Compliance: RoHS-compliant (Directive 2011/65/EU as amended by (EU) 2015/863) and REACH-compliant; declarations available on request.
  • Packaging: Medical-grade, ESD-safe containers designed to resist the surface darkening caused by transit tumbling, reducing machine-vision faults in automated ball placement systems; QR-coded for lot conformance traceability and shipping accuracy.
  • Shelf life: Two years from the date of shipment from the EasySpheres facility (product held sealed in controlled inert storage until shipped).
  • Minimum order: 10,000 spheres

EasySpheres warrants this product to be defect free, with alloy purity in compliance of IPC-JSTD-006 guidelines.

Size deviation shall not be greater than:
± 0.010% for sizes .0.004" ~ 0.018" (0.100mm~0.450mm)
± 0.015% for Sizes 0.020" ~ 0.022" (0.500mm~0.550mm)
± 0.020% for Sizes 0.024" ~ 0.035" (0.600mm~0.889mm)

Shelf life of 1 year is guaranteed by EasySpheres from date of purchase.

Frequently Asked Questions

What is the melting point of Sn42Bi58?

139 °C. Sn42Bi58 is a eutectic alloy, so it melts at that single temperature, roughly 80 °C below SAC alloys.

When should I use Sn42Bi58 solder balls?

Use Sn42Bi58 where the component or board cannot tolerate SAC reflow temperatures, or where a second, lower-temperature soldering step is required. Tin-bismuth joints are harder and more brittle than SAC joints and have a lower service temperature, so confirm suitability against the reliability requirement.

Which Sn42Bi58 diameters are available?

This page lists diameters from 0.125 mm to 0.760 mm with corresponding part numbers. EasySpheres stocks diameters across the 0.050 to 0.889 mm range; contact EasySpheres for a size not listed.

Is Sn42Bi58 RoHS-compliant?

Yes. Sn42Bi58 is a lead-free alloy and is RoHS-compliant under Directive 2011/65/EU as amended; a declaration is available on request.

What size tolerance applies to Sn42Bi58 solder balls?

Maximum dimensional tolerance is ±4%, with typical measured tolerance of ±0.50% for 0.050 to 0.450 mm, ±1% for 0.500 to 0.550 mm, and ±0.83% for 0.600 to 0.889 mm. Sphericity deviation is less than 1.5%.

Why Buy Solder Spheres from EasySpheres

Ordering and Support FAQs

Can I order Sn42Bi58 solder spheres in small quantities?

Yes. EasySpheres supplies Sn42Bi58 solder spheres with a minimum order of 10,000 spheres and scales to production volumes. Request a quote for larger requirements.

How quickly do Sn42Bi58 solder spheres ship?

Most in-stock orders placed before 2:00 PM Pacific ship the same day; other orders ship within 24 hours. EasySpheres maintains a greater-than-95% on-time delivery record.

What documentation ships with Sn42Bi58 solder spheres?

A Certificate of Conformance ships with every order, covering alloy composition, solidus and liquidus, size distribution, and sphericity. The technical data sheet and SDS are available on the product page, and standard quality documentation is available on request.

What is the shelf life of Sn42Bi58 solder spheres?

The stated shelf life is two years from the date of shipment from the EasySpheres facility. Prior to shipment the product is retained in its original sealed packaging within a controlled inert storage environment designed to minimize exposure to moisture, oxygen, and contaminants.

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