CUNECTRACU-AL COMPOSITES · PCB/SMT
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ENGINEERING CALCULATOR

SMT Busbar Current & Budget Estimate

Compare simplified conductor estimates and a non-binding budget from dimensions, material, temperature rise and quantity. Confirm assumptions, actual assembly tests and a formal quotation.

ENGINEERING TOOL

SMT Busbar Current & Budget Estimate

Simplified rectangular-conductor and non-binding budget estimates. Confirm with actual assembly testing and a formal quotation.

Quick Presets:
1. Dimensions (mm)Vol: 60 mm³ · Area: 6 mm²
2. Material & Plating
3. Thermal Rise & Volume
Ta=40°C → Tmax=85°C

Preliminary estimate, not a product rating or quotation; validate the actual PCB, contacts and cooling.

Simplified Current Estimate
26.7A
Model Temperature85 °C
Current Density4.45 A/mm²
Conductor Resistance (Model Temperature)
0.036mΩ
Excludes contact and joint resistance
Voltage Drop & Loss
0.96mV
0.026 W @ 26.7A
Equal-Section 2oz Copper Width
85.7mm
Geometric area comparison only; not thermally equivalent
Carrier Tape Width
24mm T&R
Geometry estimate; confirm pocket and feeder
Estimated Unit PriceBased on 10,000 pcs progressive stamping + reel packaging
$0.0439/pcs

Budget uses fixed reference parameters and quantity/material/finish factors. 1 CNY=0.138 USD is a model constant, not live FX. Tooling, taxes, freight, metal market prices and testing are not project-quoted. Obtain a formal quotation.

Model & Scope · v2026-09-26

Steady-state solid rectangular conductor; fixed 40°C ambient, model temperature=40°C+selected rise. I=√[h·2(w+t)·w·t·ΔT/ρ(T)] in SI units; h=5.2 flat or 6.9 vertical W/(m²·K). Copper ρ20=1.724×10⁻⁸ Ω·m, α=0.00393/K; brass ρ20=6.2×10⁻⁸ Ω·m, α=0.002/K. ρ(T)=ρ20[1+α(T−20)], R=ρ(T)L/(wt), V=IR, P=I²R. Excludes PCB current sharing, solder/contact resistance, enclosure, forced cooling, AC skin effect and transients. No published test-calibration record is available.