Calculations
JLCPCB data
Soldermask
| Location | Thickness (mil) | Thickness (mm) |
|---|
| Laminate | 1.2 | 0.03048 |
| Traces | 0.6 | 0.01524 |
Dielectric constant = 3.8
Core dielectric
Dielectric constant = 4.6
JLC04081H-3313 Stackup
Name breakdown
| Part | Meaning |
|---|
| 04 | 4 layer |
| 08 | 8mm thickness |
| 1 | 1oz outer copper |
| H | half (0.5oz) inner copper |
| 3313 | 3133 prepreg |
Stackup information
| Layer | Material Type | Thickness (mm) |
|---|
| Trace | Copper | 0.035 |
| Prepreg | 3313x1 | 0.0994 |
| Inner Layer | Copper | 0.0152 |
| Core | Core | 0.45 |
| Inner Layer | Copper | 0.0152 |
| Prepreg | 3313x1 | 0.0994 |
| Trace | Copper | 0.035 |
Core material properties
Nan Ya Plastics NP-155F (4 to 8 layers)
| Core Thickness (mm) | εr |
|---|
| 0.08 | 3.99 |
| 0.10 | 4.36 |
| 0.13 | 4.17 |
| 0.15 | 4.36 |
| 0.20 | 4.36 |
| 0.25 | 4.23 |
| 0.30 | 4.41 |
| 0.35 | 4.36 |
| 0.40 | 4.36 |
| 0.45 | 4.36 |
| 0.50 | 4.48 |
| 0.55 | 4.41 |
| 0.60 | 4.36 |
| 0.65 | 4.36 |
| 0.70 | 4.53 |
| > 0.70 | 4.43 |
Prepreg
Source 1
| Prepreg Type | Resin Content | Nominal Thickness (mil) | εr |
|---|
| 7628 | 49% | 8.6 | 4.4 |
| 3313 (2313) | 57% | 4.2 | 4.1 |
| 1080 | 67% | 3.3 | 3.91 |
| 2116 | 54% | 4.9 | 4.16 |
Source 2
| Prepreg type | Dielectric constant |
|---|
| 7628 | 4.6 |
| 3313 | 4.05 |
| 2116 | 4.25 |
Impedance calculator results
JLCPCB impedance calculator
| Parameter | Value |
|---|
| Layers | 4 |
| Thickness | 0.8mm |
| Inner copper weight | 0.5oz |
| Outer copper weight | 1.0oz |
| Stackup | JLC04081H-3313 |
NOTE: Core is 0.5mm instead of expected 0.45mm which might reduce accuracy of calculations.
Trace thicknesses
| Impedance (Ω) | Type | Config | Trace width (mm) | Trace spacing (mm) | Distance coplanar (mm) |
|---|
| 85 | Coplanar differential pair with ground | L1-L2 | 0.1549 | 0.15 | 0.15 |
| 85 | Coplanar differential pair with ground | L2-L3-L4 | 0.1334 | 0.15 | 0.15 |
| 42.5 | Coplanar single ended with ground | L1-L2 | 0.1971 | N/A | 0.15 |
| 42.5 | Coplanar single ended with ground | L2-L3-L4 | 0.1679 | N/A | 0.15 |
Sierra circuits calculations
Sierra circuits impedance calculator
Prepreg dielectric material property
Rigid - FR408HR - Prepreg
| Parameter | Value |
|---|
| Dielectric thickness | 4.2? |
| Construction | 1x3313-59% |
| Resin content | 59% |
| Frequency (GHz) | Dielectric constant | Dissipation factor |
|---|
| 1 | 3.58 | 0.009 |
| 2 | 3.57 | 0.009 |
| 5 | 3.55 | 0.010 |
| 10 | 3.54 | 0.010 |
| 20 | 3.54 | 0.010 |
Coplanar stripline differential pair with ground plane
Impedance calculator
| Parameter | Value |
|---|
| Configuration | L2-L3-L4 |
| L2-L3 dielectric height (mm) | 0.0994 |
| L2-L3 dielectric constant | 3.55 |
| L3-L4 dielectric height (mm) | 0.45 |
| L3-L4 dielectric constant | 4.4 |
| L3 Trace thickness (mm) | 0.01524 |
| L3 Trace separation (mm) | 0.15 |
| Conductor spacing (mm) | 0.15 |
| Conductor width (mm) | 0.6 |
| Dielectric covering tracks | L2-L3 |
| Input parameter | Input value | Output parameter | Output value |
|---|
| Zdiff (Ω) | 85 | Trace width (mm) | 0.1372 |
| Trace width (mm) | 0.1334 | Zdiff (Ω) | 85.88 |
Coplanar soldermask coated microstrip differential pair with ground plane
Impedance calculator
| Parameter | Value |
|---|
| Configuration | L1-L2 |
| L1-L2 dielectric height (mm) | 0.0994 |
| L1-L2 dielectric constant | 3.55 |
| Soldermask substrate height (mm) | 0.03048 |
| Soldermask trace height (mm) | 0.01524 |
| Soldermask dielectric constant | 3.8 |
| Trace thickness (mm) | 0.035 |
| Trace separation (mm) | 0.15 |
| Conductor spacing (mm) | 0.15 |
| Conductor width (mm) | 0.6 |
| Input parameter | Input value | Output parameter | Output value |
|---|
| Zdiff (Ω) | 85 | Trace width (mm) | 0.1676 |
| Trace width (mm) | 0.1549 | Zdiff (Ω) | 88.18 |
Coplanar stripline single ended with ground plane
Impedance calculator
| Parameter | Value |
|---|
| Configuration | L2-L3-L4 |
| L2-L3 dielectric height (mm) | 0.0994 |
| L2-L3 dielectric constant | 3.55 |
| L3-L4 dielectric height (mm) | 0.45 |
| L3-L4 dielectric constant | 4.4 |
| L3 Trace thickness (mm) | 0.01524 |
| Conductor spacing (mm) | 0.15 |
| Conductor width (mm) | 0.6 |
| Dielectric covering tracks | L2-L3 |
| Input parameter | Input value | Output parameter | Output value |
|---|
| Zdiff (Ω) | 42.5 | Trace width (mm) | 0.174 |
| Trace width (mm) | 0.1679 | Zdiff (Ω) | 43.27 |
Coplanar soldermask coated microstrip singled ended with ground plane
Impedance calculator
| Parameter | Value |
|---|
| Configuration | L1-L2 |
| L1-L2 dielectric height (mm) | 0.0994 |
| L1-L2 dielectric constant | 3.55 |
| Soldermask substrate height (mm) | 0.03048 |
| Soldermask trace height (mm) | 0.01524 |
| Soldermask dielectric constant | 3.8 |
| Trace thickness (mm) | 0.035 |
| Conductor spacing (mm) | 0.15 |
| Conductor width (mm) | 0.6 |
| Input parameter | Input value | Output parameter | Output value |
|---|
| Zdiff (Ω) | 42.5 | Trace width (mm) | 0.2 |
| Trace width (mm) | 0.1971 | Zdiff (Ω) | 44.5 |