Comprehensive Guide to 4-Layer Rogers Spray Tin PCB Board (RO4350B)

Product Overview: What Is a 4-Layer Rogers Spray Tin PCB Board?

O 4-Board PCB strat Rogers Spray Tin uses Rogers RO4350B high-frequency laminate as its core material. It applies a lead-free hot air solder leveling (Sângera) finish. This high-frequency multilayer printed circuit board serves 5G communication base stations, RF front-end modules, and millimeter-wave radar systems. UGPCB offers this product as a key solution in our PCB de înaltă frecvență line.

The global high-frequency and PCB de mare viteză market continues to grow rapidly. According to QYResearch, the market size reached approximately USD 3.611 miliarde in 2024 and expects to grow to about USD 6.924 billion by 2031. This represents a compound annual growth rate (CAGR) de 9.95%. The 4-Board PCB strat Rogers Spray Tin plays an important role in this expanding market.

Scientific and Accurate Product Classification

Based on IPC-6012 Qualification and Performance Specification for Rigid Printed Boards, this product falls into the following category: rigid multilayer printed board with plated-through holes, high-frequency laminate, 4-layer structure, lead-free HASL finish. Under material classification, it belongs to ceramic-filled hydrocarbon resin high-frequency copper-clad laminates (RO4000 series), specifically the RO4350B type. For application, we classify it as a base station RF/microwave printed circuit board.

Product Definition and Technical Specifications

UGPCB designs and manufactures this 4-Board PCB strat Rogers Spray Tin as a high-frequency multilayer circuit board. It uses Rogers RO4350B laminate as the primary material. The 4-layer structure achieves high-frequency signal transmission and electrical interconnection. The lead-free HASL process completes the pad surface finish. This design meets both high-frequency performance and environmental compliance requirements for base station subboards.

Key Parameters Table

Working Principle and Electrical Characteristics

The 4-Board PCB strat Rogers Spray Tin operates based on transmission line theories such as microstrip, stripline, și ghid de undă Coplanar. When high-frequency signals travel along the circuit, the dielectric constant (DK) of the substrate determines the signal propagation speed and wavelength. The dissipation factor (Df) determines the energy loss during transmission.

Rogers RO4350B material offers excellent properties:

• Constanta dielectrică (DK): typical value of 3.48 (±0.05 tolerance) la 10 GHz. This tightly controlled Dk value allows precise impedance control to target values like 50Ω or 75Ω. This forms the physical basis for stable high-frequency circuit performance. Rogers official data confirms that both RO4350B and RO4835 maintain Dk tolerance within ±0.05. This far exceeds the ±0.2 or higher variation typical of standard FR-4 materiale.

• Factor de disipare (Df): typical value of 0.0037 la 10 GHz. This remains much lower than the loss of ordinary FR-4 (≈0.02). It effectively reduces high-frequency signal energy loss, ensuring RF signal transmission efficiency and signal-to-noise ratio.

• Temperature Stability: RO4350B’s dielectric constant shows excellent stability across a wide temperature range from -50°C to 150°C. The variation rate stays very low (less than 0.05 PPM/° C.). This ensures stable operation of base station equipment even in harsh high or low temperature environments.

Product Structure and Stackup Design

Acest 4-Board PCB strat Rogers Spray Tin uses a typical high-frequency 4-layer stackup configuration. As a rigid multilayer printed board, it must meet IPC-6012 specification requirements. This standard covers final product and surface finish requirements, conductor and via acceptance test frequencies, and quality conformance inspections. It also addresses electrical, mecanic, and environmental performance criteria.

Product Features and Core Advantages

✅ Excellent High-Frequency Performance

The RO4350B substrate features a tight Dk tolerance of 3.48±0.05 combined with a low Df of 0.0037. This allows the 4-Board PCB strat Rogers Spray Tin to support signal transmission up to 10 GHz and even higher frequency bands. It works especially well for RF front-end applications such as base station subboards.

✅ Superior Thermal Stability

RO4350B material exhibits a coefficient of thermal expansion (Cte) that closely matches copper foil. In thermal cycling tests from -50°C to 150°C, the Z-axis CTE remains approximately 40 PPM/° C.. This significantly reduces the risk of delamination compared to standard FR-4 materials (which range from 60 la 70 PPM/° C.). Astfel, this 4-Board PCB strat Rogers Spray Tin ensures high reliability during long-term base station operation.

✅ Good Fabrication Friendliness

Unlike traditional PTFE (politetrafluoroetilenă) materiale de înaltă frecvență, RO4350B is a thermoset hydrocarbon ceramic composite. Its processing method matches standard epoxy/glass (FR-4). It requires no special via treatment or plasma activation. Prin urmare, production costs for this 4-Board PCB strat Rogers Spray Tin stay much lower than for conventional microwave laminates.

✅ Strong Process Compatibility

The lead-free HASL surface treatment uses SAC305 alloy (Sn96.5Ag3.0Cu0.5). This complies with RoHS environmental directives. Lead-free HASL offers relatively low cost, good solderability, and good corrosion resistance. According to industry standards like IPC-A-610 and IPC-6012, HASL-finished PCBs have a shelf life of approximately 12 luni. Typical tin layer thickness ranges from 1 la 40 μm.

✅ Excellent Flame Retardancy

RO4350B material achieves Ul 94 V-0 rating de flacără. This represents the highest flame retardancy level in the standard for flammability testing of plastic materials. After removing the flame, the material self-extinguishes within 10 seconds and produces no flaming drips. This feature enables the 4-Board PCB strat Rogers Spray Tin to meet the safety and fire protection requirements of base station equipment.

✅ Authoritative Certifications

UGPCB 4-Board PCB strat Rogers Spray Tin fully complies with international standard systems. Acestea includ ISO 9001:2015 quality management certification, Ul 94 V-0 rating de flacără, IPC-6012 rigid board qualification and performance specification, and IPC-A-600 printed board acceptance standard.

Design Guidelines and Key Considerations

When designing a 4-Board PCB strat Rogers Spray Tin, engineers should focus on the following areas:

1. Impedance Control Design

Transmission line theory gives the characteristic impedance of a microstrip line:

Where εr is the dielectric constant (3.48 for RO4350B), h is the dielectric thickness, w is the trace width, and t is the copper thickness. The stable Dk of this 4-Board PCB strat Rogers Spray Tin provides a physical foundation for precise impedance control. We recommend using impedance calculation software for accurate simulation.

2. Minimum Line Width and Spacing Limits

This product supports a minimum line width and spacing of 5 mil (≈0.127 mm) and a minimum drilled hole diameter of 0.3 mm. Designers must consider manufacturing tolerances. For high-density interconnect needs, maintain proper spacing between signal lines and ground planes to optimize signal integrity.

3. Thermal Management Design

The outer copper thickness reaches 2 Oz (≈70 μm) while the inner copper thickness is 1 Oz (≈35 μm). This thicker copper layer design not only enhances the current-carrying capacity of the 4-Board PCB strat Rogers Spray Tin but also provides excellent heat dissipation. For high-power applications like base station subboards, optimize heat distribution by adding ground via arrays and thermal pads.

4. HASL Process Adaptation

Lead-free HASL requires higher solder pot and hot air temperatures (typically 235–250°C). The soldering temperature can reach 255±5°C. When designing this 4-Board PCB strat Rogers Spray Tin, avoid dense, fine-pitch pads on large copper areas. Also ensure adequate solder mask dam width. This prevents solder bridging issues caused by uneven tin layer thickness.

5. Lead-Free Process Control

Lead-free HASL demands strict process control. The solder pot must use titanium alloy or cast iron to withstand the high temperature corrosion of lead-free solder. The temperature difference across the pot must stay within ±2°C. A powerful hot air system and fast air cooling module ensure uniform tin layer application and leveling.

Manufacturing Process and Quality Control

UGPCB follows a standardized process flow for producing the 4-Board PCB strat Rogers Spray Tin. This ensures consistent product quality and reliability. The core manufacturing steps for multilayer rigid PCBs include inner layer circuit formation, lamination and pressing, drilling and via metallization, outer layer circuit formation, Masca de lipit, and surface finishing. UGPCB sets inspection points at each critical stage. All products fully meet IPC-6012 qualification and performance requirements.

Application Scenarios and Use Cases

Primary Application: Base Station Subboard

Acest 4-Board PCB strat Rogers Spray Tin is specifically designed for base station subboards. It serves as a critical interconnect carrier in RF transceiver modules, power amplifier modules, antenna tuning modules, and filters within 5G/4G communication base stations.

Typical Use Cases

Request a Quote or Technical Support

UGPCB provides high-quality 4-layer Rogers spray tin PCB boards and complete high-frequency PCB solutions to global customers. We operate advanced high-frequency PCB production lines and maintain a professional engineering team. We implement full-process quality control from customer design input to final product delivery.

📩 How to Request a Quote or Contact Technical Support

You can reach us through any of the following methods:

• Visit the UGPCB official website (www.ugpcb.com) and submit an online inquiry form

• Send your design files (Gerber files) to our sales email address

• Call our hotline to discuss your technical requirements with our engineers

To speed up your inquiry, please provide the following information:

• Design Files: Gerber files, pile de foraj, stackup diagram, impedance control requirements

• Technical Specifications: Special Dk/Df requirements, tolerances, test and acceptance standards for the 4-Board PCB strat Rogers Spray Tin

• Quantity and Lead Time: Prototype or production phase, target delivery schedule

• Special Requirements: Flying probe testing, AOI inspection, 100% electrical test

Source Data Statement

This article cites technical data from the following authoritative sources:

• Rogers Corporation Official Datasheet: RO4000® Series High-Frequency Circuit Materials Data Sheet

• Standarde IPC: IPC-6012 Qualification and Performance Specification for Rigid Printed Boards, IPC-A-610, IPC-TM-650

• UL Safety Standards: Ul 94 Standard for Tests for Flammability of Plastic Materials

• Market Analysis Report: QYResearch *Global High-Frequency and High-Speed Board Market Research Report 2025*