Step slot PCB board

With the continuous advancement of modern technology, electronic devices have become essential components in daily life, and printed circuit boards serve as the core foundational carrier for all electronic equipment. As end products evolve toward multi-function and high integration, higher technical standards and structural design requirements have been raised for PCBs. To accommodate the assembly of special components, sunken structural layout and high-power heat dissipation design, step slot structures are widely adopted in PCB fabrication. As a key structural design solution, step slot PCBs have been extensively applied across the electronics manufacturing industry.

Currently, two mainstream processing technologies are commonly used for PCB step slot fabrication.

The first solution is controlled-depth routing. This processing method faces prominent technical limitations in mass production. It is difficult to achieve precise depth control, and the routing layer cannot be accurately positioned to the designated inner circuit layer, resulting in non-compliant structural dimensions and failure to meet design specifications. Additionally, circuit patterning cannot be realized on the bottom surface of the milled slot, which restricts its application scope.

The second processing approach adopts gasket embedding and filling technology. This method is prone to lamination void defects. During the high-pressure lamination process, residual air inside the step slot is compressed by pressing plates, generating uneven extrusion stress. This leads to gasket displacement and misalignment, creating gaps between core substrates and prepreg at the slot edge. Permanent cavities will remain after gasket removal. Such internal voids seriously degrade PCB long-term reliability, expose metallic circuits at hole areas, and cause delamination or cracking under mechanical and environmental stress.

Custom step slots and stepped holes can be tailor-made with personalized dimensions and structural parameters fully complying with customer design specifications.

Maxipcb is a high-tech enterprise specialized in the manufacturing of high-precision single-sided, double-sided and multilayer printed circuit boards. The production coverage ranges from 1 to 70 layers, with a minimum aperture of 0.075 mm and a minimum line spacing up to 1.5mil (0.03 mm). Our products are widely applied in aerospace, communication, optoelectronics, industrial control, precision instrument, automotive electronics and household appliance industries.

Adhering to the management philosophy of customer-centricity, integrity operation, progressive innovation and win-win cooperation, the company implements a strict quality management policy featuring quality priority, full participation, continuous optimization and excellence pursuit. We always provide customers with competitive lead time, stable quality, cost-effective pricing and comprehensive after-sales services. With reliable product performance and professional technical support, Maxipcb has earned long-term recognition and stable trust from global clients.