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PCB Board FR-4, 2 copper planes vs. Solder SAC305

Compare PCB Board FR-4, 2 copper planes vs. Solder SAC305 strength, stiffness, weight and thermal properties.

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PCB Board FR-4, 2 copper planesComposite
Solder SAC305Cast
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Mechanical
Yield strengthnot given (tensile used)22MPasourcetypical
Ultimate tensile strength246–385MPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D3039)39.6MPasourcetypical
Elongation at breaknot sourced49%sourcetypical
Young's modulus (stiffness)21.9–25.8GPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D790-15e2); the copper planes are left out6.9GPasourcetypical, temperature and strain rate not stated
Densitynot sourced7,350kg/m³sourcetypical
Strength to weightnot sourced2.99kN·m/kg
Stiffness to weightnot sourced0.939MN·m/kg
Poisson's ratio0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction0.35sourcetypical
Shear modulus10.2GPa3.98x stiffer in shear2.56GPa
Bulk modulus12.2GPa7.67GPa
Speed of soundnot sourced969m/s
Thermal
Thermal conductivitynot sourced61W/m·Ksourcetypical, temperature not stated
Thermal expansion13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C)21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha)
100 mm part over a 50 °C swing67.5µm growth1.62x less110µm growth
Specific heatnot sourced232J/kg·Ksourcetypical (MacDermid Alpha)
Heats up and cools (diffusivity)not sourced35.8mm²/s
Thermal shock resistancenot sourced5,773W/m
Melting pointnot sourced217–220°Csourcesolidus-liquidus
Values forA whole circuit board read as one orthotropic plate: the JEDEC high-K thermal test board (JESD51-7, "2s2p"), 0.062 in (1.575 mm) thick with two internal solid copper planes 0.0014 in (1 oz) thick, as Texas Instruments SZZA017A Table 1 gives it. Copper C110 and the Isola 370HR laminate from this library; the layers conduct in parallel along the board and in series through it (boardStackup.ts). Its two 0.0028 in trace layers cover little of the board and are left out; vias are ignored. Mechanical values are the bare laminate's.SAC305 (Sn96.5Ag3.0Cu0.5) solder alloy, bulk; Indium Corporation Indalloy 256 (SAC305) for Preforms product data sheet (Form No. 100346 R0, 2024), selected properties, test temperature not stated; expansion and specific heat from MacDermid Alpha VACULOY SAC TDS (06 September 2023).

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is PCB Board FR-4, 2 copper planes stronger than Solder SAC305?

PCB Board FR-4, 2 copper planes is stronger: its tensile strength is 315 MPa against yield strength 22 MPa for Solder SAC305 (14.3x).

Which is stiffer, PCB Board FR-4, 2 copper planes or Solder SAC305?

PCB Board FR-4, 2 copper planes is stiffer: Young's modulus 23.9 GPa against 6.9 GPa for Solder SAC305, so the same part in PCB Board FR-4, 2 copper planes deflects less under the same load.

Which expands less with temperature?

PCB Board FR-4, 2 copper planes expands less: 13.5 µm/m·K against 21.9 µm/m·K for Solder SAC305.

Among 73 materials

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Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickPCB Laminate FR-4SiliconCeramic Alumina 96%Aluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DPlastic PBT GF30Plastic PPS GF40Plastic LCP GF30Solder SAC305
Strength against density

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