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What is Minimum Trace Width in High Frequency PCB? |
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1.Definition of Minimum Trace Width |
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Minimum trace width refers to the minimum width of the copper conductor on a PCB. The dimension of the copper conductor is measured on the horizontal plane and is usually in units of mils or millimeters. |
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2.Influencing Factors of Minimum Trace Width |
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2.1 Current - carrying Capacity
Trace width determines safe current - carrying. Empirical formula shows 1oz copper, 1mm inner - layer width ≈ 1A. High - current circuits need wider traces to avoid overheating. Narrow ones overheat due to high resistance, degrading performance.
2.2 Manufacturing Process Limitations
Manufacturers' equipment and process accuracy vary. Common processes may have 6mil min width, advanced ones 2mil or less (photolithography/etching - dependent). Poor accuracy causes inconsistent widths, harming performance.
2.3 Signal Integrity
In high - frequency circuits, trace width affects characteristic impedance (linked to width, dielectric thickness/constant). Precise control is needed to minimize reflection and match impedance, crucial in high - speed boards. |
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3.Measures to Increase Minimum Trace Width |
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3.1 Optimize Circuit Design
Re-plan layout while ensuring functionality to cut narrow trace need. E.g., merge small-current branches to free up width for other traces. Allocate power & signal paths smartly. For high-current lines, reserve wider routing space.
3.2 Adopt Multilayer Board Design
Multilayer boards allow for more layers to optimize design. Moving traces inwards enables wider widths, ideal for handling high current. Use stack structure for better grounding & shielding to reduce EM interference and permit wider traces without performance hit.
3.3 Communicate with Manufacturer
Check with manufacturers for new processes/equipment for wider traces. Some offer thick-copper processes for both width and current needs. Follow advice to relax non-critical widths for better efficiency and quality.
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4.Strengths of Taconic TLY-5A PCB's Minimum Trace Width |
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When it comes to the minimum trace width in PCBs, I invariably think of Taconic TLY-5A high-frequency PCB. The advantages of Taconic TLY - 5A laminate are mainly reflected in the following aspects.
4.1 Small minimum trace width value
The minimum trace width of Taconic TLY - 5A PCB can reach 3mil. This relatively small value enables more precise wiring in the design of high - frequency circuit boards. Within a limited space, more traces can be accommodated, thereby increasing the integration density of the circuit board. It can meet the requirements of complex high - frequency circuit designs with high wiring density.
4.2 High-precision manufacturing
Taconic, a professional high-frequency PCB maker, has advanced equipment and strict QC. Ensures precise control of minimum trace width (tolerance within ±1.0mil). Guarantees trace consistency/stability, reducing signal transmission issues from width variations. |
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4.3 Support from material properties |
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Description |
Details |
Material Composition |
Made by pressing materials such as woven fiberglass cloth coated with PTFE |
Material Characteristics |
- Low dielectric constant, ranging from 2.17 to 2.40
- Low dissipation factor, close to 0.0009 when tested at 10GHz
- Dimensional stability |
Impact on Wiring and Signal Transmission |
- Achieve higher - quality signal transmission during fine - pitch wiring
- Reduce signal reflection and crosstalk
- Better control signal integrity, ensuring stable and reliable signal transmission even with a relatively narrow trace width, and reducing signal attenuation and distortion during transmission |
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4.4 Adaptation to high-frequency applications |
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Targets high-frequency/ high-speed electronics (e.g., automotive radar, satellite communications，cellular communications，power amplifiers). In these scenarios, short-wavelength signals need handling. Circuit discontinuities cause reflection/interference. Precise wiring is key to optimize routing & cut propagation distance. Taconic TLY-5A's minimum trace width helps fit high-frequency needs & achieve high-performance designs. |
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5.Recap |
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From the perspective of current carrying capacity, minimum trace width determines the safe current-carrying capacity of the conductor. In terms of manufacturing process, its precision affects the realization of the minimum trace width and is related to PCB production. According to transmission line theory, trace width affects characteristic impedance and signal integrity. In short, the minimum trace width runs through all aspects of PCB and is a core element of quality and performance. |
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Founded in 2003, Shenzhen Bicheng Electronics Technology Co., Ltd is an established high frequency PCB supplier and exporter in Shenzhen, China, serving customers worldwide.
We are devoted to delivering high-frequency PCB products and solutions of the highest quality, along with customized service. Feel free to consult and contant at any time !
Visit https://www.bicheng-enterprise.com to learn more.
Unlock its full potential by contacting Vicky at v.xie@bichengpcb.com. |
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