In response to our customers’ strong requests, JLCPCB has added multiple laminate structures and proprietary structures to our offerings (currently we have already added more than 200, with continuous updates, click here to check), which can greatly satisfy product structure designs and impedance requirements. At the same time, we offer standard free impedance testing (impedance tolerance ±20%) and precision impedance testing (chargeable). You can freely choose these when making an order.
Impedance Control Design Information
1. Copper Layer Thickness
| Outer Layer Finished Copper Thickness (1 oz) | Inner Layer Finished Copper Thickness (0.5 oz) | Inner Layer Finished Copper Thickness (1 oz) |
|---|---|---|
| 1.6 mil | 0.6 mil | 1.2 mil |
2. Soldermask Thickness (Dielectric Constant 3.8)
| Soldermask Thickness On FR-4 | Soldermask Thickness On Copper | Soldermask Thickness Between Traces |
|---|---|---|
| 1.2 mil | 0.6 mil | 1.2 mil |
3. Laminate Naming Scheme
Impedance Calculation Tools
1. Basic knowledge about impedance can be referenced in the impedance design instruction (click to open).
2. For impedance value calculation, we recommend using the online “JLCPCB Impedance Calculator” , dielectric constant, and usage methods.
3. Use the JLCPCB Impedance Calculator in conjunction with your selected laminate structure to design the line width and spacing.