Isola 370HR 12-Layer High-Performance PCB for Demanding Applications
1.Introduction
Isola's 370HR is an advanced FR-4 material system with a 180°C glass transition temperature (Tg), designed for multilayer PCBs requiring exceptional thermal performance and reliability. Combining a high-performance multifunctional epoxy resin with E-glass reinforcement, 370HR delivers:
Enhanced Thermal Stability: Td 340°C, T288 30 minutes
Low CTE: 13/14 ppm/°C (X/Y-axis) for reduced warpage
UV Blocking & AOI Fluorescence: Optimized for automated inspection
FR-4 Process Compatibility: Easy integration into existing workflows
Ideal for computing, automotive, and aerospace applications where sequential lamination and impedance control are critical.
2.Key Performance Features
Thermal Performance: Tg 180°C (DSC), T260 60 minutes
CAF Resistance: Enhanced reliability for high-density designs
RoHS Compliance: Environmentally friendly
Impedance Control: ±10% tolerance (7–10mil traces, 100Ω)
Surface Finish: ENIG (0.1μm gold) for -40°C to +85°C operation
3.1PCB Specifications at a Glance
| Parameter | Specification |
|---|---|
| Base Material | 370HR High-Tg FR-4 |
| Layer Count | 12-layer |
| Board Dimensions | 120mm × 88mm (±0.15mm) |
| Trace/Space | 4/6 mils |
| Hole Size | 8 mils (0.2mm) |
| Via Technology | Blind vias (L1-L4, L1-L10) |
| Copper Weight | 1oz (signal/planes) |
| Silkscreen | White (Top/Bottom) |
| Solder Mask | Green (Top/Bottom) |
| Board Thickness | 1.58mm (±10%) |
| Surface Finish | ENIG (0.1μm gold) |
| Operating Temp Range | -40°C to +85°C |
| Certifications | UL Marked, 100% Electrical Test |
3.2Impedance Control
| Layer | Trace Width | Impedance | Reference Layer |
|---|---|---|---|
| 1 | 7mil | 100Ω | Layer 2 |
| 3 | 9mil | 100Ω | Layer 2 |
| 4 | 10mil | 100Ω | Layer 5 |
| 6 | 7mil | 100Ω | Layer 5 |
4.PCB Stackup: 12-layer rigid PCB
| Layer | Type | Thickness | Material | Copper Weight |
|---|---|---|---|---|
| 1 | Top Layer | 0.0727mm | IS370HR Prepreg (1080 x1) | 1oz (1.4mil) |
| 2 | Ground Plane | 0.0727mm | IS370HR Prepreg (1080 x1) | 0.5oz (0.7mil) |
| 3 | Mid Layer 1 | 0.0727mm | IS370HR Prepreg (1080 x1) | 0.5oz (0.7mil) |
| 4 | Mid Layer 2 | 0.1479mm | IS370HR Prepreg (1080 x2) | 0.5oz (0.7mil) |
| 5 | Power Plane | 0.2mm | IS370HR Core | 0.5oz (0.7mil) |
| 6 | Copper Layer | 0.1479mm | IS370HR Prepreg (1080 x2) | 0.5oz (0.7mil) |
| 7 | Power Plane | 0.2mm | IS370HR Core | 0.5oz (0.7mil) |
| 8 | Copper Layer | 0.1479mm | IS370HR Prepreg (1080 x2) | 0.5oz (0.7mil) |
| 9 | Copper Layer | 0.0727mm | IS370HR Prepreg (1080 x1) | 1oz (1.4mil) |
| 10 | Ground Plane | 0.0727mm | IS370HR Prepreg (1080 x1) | 0.5oz (0.7mil) |
| 11 | Copper Layer | 0.0727mm | IS370HR Prepreg (1080 x1) | 0.5oz (0.7mil) |
| 12 | Bottom Layer | - | - | 1oz (1.4mil) |
5.PCB Statistics:
Components: 59
Total Pads: 355
Thru Hole Pads: 129
Top SMT Pads: 178
Bottom SMT Pads: 48
Vias: 211
Nets: 61
6.Typical Applications
High-speed computing & data storage
Automotive ECUs & ADAS
Aerospace avionics
Medical imaging systems
Industrial control PCBs
7.Quality Assurance
Commercial airline broadband antennas
Microstrip/stripline circuits
Millimeter-wave systems
Radar and guidance systems
Point-to-point digital radio antennas
370HR combines FR-4 processability with high-reliability performance for complex multilayer designs.