Performance Characteristics of 370HR Substrates
If your knowledge of PCBs is still at the beginning stage, you might be caught off guard when someone asks you about the performance of the 370HR. So, what does 370HR mean?
370HR is a high-performance material from ISOLA. It is a 180°C glass transition temperature (Tg) FR-4 system designed for multilayer Printed Wiring Board (PWB) applications where maximum thermal performance and reliability are required. 370HR laminates and prepregs are manufactured with a unique high-performance multifunctional epoxy resin, reinforced with electrical grade (E-glass) glass fabric. This system provides improved thermal performance and low expansion rates in comparison to traditional FR-4 while retaining the processability of conventional FR-4.
In addition to its superior thermal performance, the mechanical, chemical, and moisture resistance properties all equal or exceed the performance of traditional FR-4 materials. The 370HR system is also laser fluorescing and UV blocking for maximum compatibility with Automated Optical Inspection (AOI) systems, optical positioning systems, and photoimageable solder mask imaging. 370HR has proven to be best in class for sequential lamination designs.
1. Features
(1) High Thermal Performance: Tg: 180°C (DSC); Td: 340°C (TGA @ 5% wt loss); Thermal Conductivity: 0.4 W/m·K.
(2) Thermal Stress Resistance: T260: >60 minutes; T288: >30 minutes.
(3) Low CTE for Reliability:
- Z-Axis CTE: 45 ppm/°C (Pre-Tg), 230 ppm/°C (Post-Tg), 2.8% (50 to 260°C).
- X/Y-Axis CTE: 13/14 ppm/°C (Pre-Tg).
(4) Stable Electrical Properties:
- Dk (Dielectric Constant): 4.24 @ 100MHz, 4.17 @ 1GHz, 4.04 @ 2GHz.
- Df (Loss Tangent): 0.015 @ 100MHz, 0.016 @ 1GHz, 0.021 @ 2GHz.
(5) Mechanical Strength:
- Flexural Strength: 90.0 ksi (Length), 77.0 ksi (Cross).
- Tensile Strength: 55.9 ksi (Length), 35.6 ksi (Cross).
(6) ROHS Compliant: Meets environmental standards.
(7) UV Blocking and AOI Fluorescence: Ensures high throughput and accuracy during PCB fabrication and assembly.
(8) Superior CAF Resistance: Proven best-in-class performance for high-reliability applications.
(9) Low Moisture Absorption: 0.15%.
(10) Superior Processing: Processing parameters are closest to conventional FR-4.
(11) Flammability Rating: UL 94 V-0.
(12) Core Material Standard Availability Thickness: 0.002″ (0.05 mm) to 0.125″ (3.2 mm). Available in full-size sheet or panel form.
(13) Prepreg Standard Availability: Available in roll or panel form; tooling of prepreg panels is also available.
(14) Copper Foil Type Availability: Standard HTE Grade 3; RTF (Reverse Treat Foil).
(15) Copper Weights: ½, 1, and 2 oz (18, 35, and 70 μm) are available; Heavier and thinner copper foils are available upon request.
(16) Glass Fabric Availability: Standard E-glass; square weave and spread glass fabrics are available.
2. Applications
370HR is widely used in high-reliability and high-performance electronic systems across various industries, including:
- Telecommunications: High-speed networking equipment, servers, and backplanes.
- Automotive: ADAS, radar systems, and power management units.
- Aerospace & Defense: Avionics and military-grade electronics.
- Industrial: High-power converters and automation systems.
- Medical: Imaging and diagnostic equipment.
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