Double-Layer Aluminum PCB with High-Density Circuits, Thermal Management, and

Product Specification

Product Description

When a single-layer aluminum PCB runs out of routing room, the answer is our double-layer aluminum PCB. Two copper layers are separated by an insulating prepreg and laminated onto an aluminum base; plated through holes (PTH) electrically connect the top and bottom circuit layers, while the aluminum core continues to do what FR4 cannot — pull heat out of the board and spread it across a large, low-resistance metal mass.

In this structure, the bottom copper layer sits against the thermal dielectric and aluminum base, so power devices and LEDs are typically placed on the bottom side for the shortest heat path, while control, logic, and connector circuitry occupies the top layer. Through holes can also be engineered as thermal vias under components to pass heat into the base. Where a design requires both circuit layers on the same side of the aluminum, or bottom-side components with drilled, insulated aluminum, we review the design in DFM and propose the most manufacturable stackup.

Compared with an FR4 4-layer board plus external heat sink, a double-layer aluminum PCB often delivers the same function in a thinner, lighter, cheaper assembly — one board that routes the signals, carries the current, and cools the components. All boards are produced under ISO 9001, ISO 13485, and IATF 16949 quality systems and are RoHS compliant and UL certified.

Key Features

• Double the routing capacity: two copper layers with PTH interconnection support significantly higher circuit density and more complex topologies than single-layer MCPCB.
• Aluminum-core heat dissipation: the thermally conductive dielectric and metal base remove heat from power devices far more efficiently than FR4, without any added heat sink.
• Clean power/signal partitioning: dedicate one layer to high-current power and the other to control signals — better EMI behavior and easier grounding (solid ground plane on the thermal layer).
• Thermal via enhancement: vias under power pads can be filled/plugged to short heat directly into the aluminum base.
• Rigid, flat, mount-ready: the aluminum core keeps the board dimensionally stable through reflow and doubles as a structural, screw-mountable, heat-spreading chassis.
• Slimmer total assembly: replaces "FR4 board + insulation pad + metal base" stacks, reducing thickness, weight, part count, and assembly labor.
• Heavy copper option: up to 3 oz copper per layer for power-dense designs.
• Certified quality: ISO 9001, ISO 13485, IATF 16949, RoHS, UL — one supplier from prototype through automotive or medical production.

Manufacturing Capabilities

Why Choose Us

• Experienced MCPCB + PCBA factory — Huayihai Technology Co., Ltd., established 2005, fabricates double-layer aluminum PCBs and assembles them under one roof, with 20+ years of export experience.
• Certified quality systems — ISO 9001, ISO 13485, IATF 16949, RoHS, UL Certification; automotive PPAP and full material traceability available.
• Structure flexibility — we manufacture the standard two-layer-on-aluminum stackup as well as special structures (both layers on one side, insulated drilled aluminum), confirmed by DFM review with your Gerbers.
• Engineering partnership — free stackup and thermal-path review: we help place power devices on the thermal layer, plan thermal vias, and set impedance targets before tooling.
• One-stop service — PCB fabrication, component sourcing, SMT/through-hole assembly, burn-in and functional testing, all from a single supplier with single-point accountability.
• Reliable global delivery — 100% electrical test on every board, vacuum-sealed ESD-protected export packaging, and T/T, L/C, D/P, D/A, Western Union payment options.

FAQ

A: A double-sided FR4 board has copper on both sides of an insulating core with no metal base — heat stays trapped in the board and needs an external heat sink. A double-layer aluminum PCB adds a thermally conductive dielectric and an aluminum base, so heat flows directly into the metal core. You get similar routing density with dramatically better thermal performance.

A: In the standard stackup, the bottom copper layer is closest to the thermal dielectric and aluminum base, so power devices and LEDs belong on the bottom layer for the shortest heat path; the top layer carries control and logic. Our engineers review this during DFM and confirm the best arrangement for your design.

A: The aluminum base is conductive, so standard vias stop at the circuit stack. Insulated, drilled-through-aluminum structures are possible as a special process — send your files and we will confirm feasibility, cost, and lead time.

A: Yes. Vias under thermal pads can be plated and plugged (filled with epoxy and capped with copper) to conduct heat from the top layer down to the aluminum base — a standard option on our 2-layer MCPCB.

A: It costs more due to lamination, drilling, and plating, but it is often cheaper in total than a 4-layer FR4 board with a separate heat sink, insulation pad, and assembly hardware. Cost depends on hole count, size, and copper weight — send Gerbers for a detailed quote.

A: Prototypes in 7–9 working days, mass production in 12–18 working days, slightly longer than single-layer aluminum due to the lamination and PTH processes.

A: Yes. Controlled-impedance fabrication is available; share your impedance requirements and we will confirm the stackup and coupon testing.

A: Yes — SMT and through-hole assembly on both layers, component sourcing, and functional/burn-in testing, delivered as finished modules.