Complete guide to Ventec VT-47 PCB laminate: Tg, Dk, CAF resistance, lead-free compatibility, applications in automotive, telecom, medical & computing.
If you’ve ever specced out a mid-layer count multilayer board that has to survive lead-free reflow without delaminating, you’ve probably wrestled with the classic trade-off: stick with bargain-basement 140掳C Tg FR-4 and hope for the best, or jump to expensive exotic resin systems. The Ventec VT-47 PCB laminate sits squarely in the sweet spot that most fabricators and design engineers are actually looking for 鈥� a 180掳颁 Tg, phenolic-cured FR-4 that handles lead-free assembly, resists CAF, and doesn’t blow your BOM cost out of the water.
This guide walks through what VT-47 actually is, its real-world datasheet numbers, how it compares to standard FR-4, where it fits best in practice, and the process parameters your fab house should be using. The goal is to give you something you can actually reference on your next stack-up review.
What Is Ventec VT-47 PCB Laminate?
Ventec VT-47 is a high-Tg, phenolic-cured, FR-4 copper clad laminate and prepreg system manufactured by Ventec International Group, one of the larger global suppliers of copper clad laminates headquartered out of Suzhou, China with operations worldwide. The material carries UL approval E214381 and complies with IPC-4101D-WAM1 slash sheets /97, /98, /99, /101, and /126 (most compliant to /126).
In plain engineering terms, VT-47 is what you reach for when standard 140掳C Tg FR-4 isn’t thermally robust enough but you don’t need to pay for polyimide or a low-Dk high-speed system. It’s a workhorse for lead-free assembly, multilayer construction, and applications where the board sees real thermal cycling.
The product family includes both VT-47 CCL (laminate) and VT-47 PP (prepreg), and it shares a UL family with VT-481. You’ll typically see it specified on commercial, industrial, automotive, and medical PCBs where IPC Class 2 or Class 3 reliability is required but the operating frequency stays under ~1 GHz.
Key Technical Specifications of Ventec VT-47 PCB Laminate
Let’s cut straight to the datasheet. The following values are typical from the Ventec VT-47 technical data sheet (Rev. B3) tested per IPC-TM-650 on a 0.036″ 1oz/1oz test sample.
Thermal Properties
| Property | Test Method | Typical Value |
| Glass Transition Temp (Tg) 鈥� DSC | IPC-TM-650 2.4.25 | 180掳颁 |
| Glass Transition Temp (Tg) 鈥� TMA | IPC-TM-650 2.4.24 | 180掳颁 |
| Decomposition Temp (Td) @ 5% weight loss | ASTM D3850 | 355掳颁 |
| Time to Delamination T260 | IPC-TM-650 2.4.24.1 | >60 min |
| Time to Delamination T288 | IPC-TM-650 2.4.24.1 | >30 min |
| Thermal Stress @ 288掳C | IPC-TM-650 2.4.13.1 | >600 sec |
| Z-axis CTE (before Tg) | IPC-TM-650 2.4.24 | 45 ppm/掳C |
| Z-axis CTE (after Tg) | IPC-TM-650 2.4.24 | 190 ppm/掳C |
| Total Z-axis Expansion (50鈥�260掳C) | IPC-TM-650 2.4.24 | 2.3% |
| Maximum Operating Temp (MOT) | UL 94 | 130掳颁 |
What these numbers tell you: a Td of 355掳颁 gives you plenty of headroom above the 260掳C peak reflow temperature of SAC305 lead-free paste, and the T288 of more than 30 minutes means the laminate won’t blister or delaminate across multiple reflow cycles 鈥� a genuine concern on rework-heavy assembly lines.
Electrical Properties
| Property | Condition | Typical Value |
| Dielectric Constant (Dk) | 1 GHz, RC 50% | 4.2 (4.47 per some sources) |
| Dissipation Factor (Df) | 1 GHz | 0.016 |
| Volume Resistivity | After moisture | 10鈦� M惟路cm |
| Surface Resistivity | After moisture | 10鈦� M惟 |
| Dielectric Breakdown | 鈥� | >45 kV |
| Electrical Strength | 鈥� | 1200鈥�1400 V/mil |
| Comparative Tracking Index (CTI) | 鈥� | Class 3 |
Honest take on the electrical side: at a Df of 0.016, VT-47 is not a high-speed or RF material. Above 1 GHz you’ll start eating measurable insertion loss. For controlled impedance work below 1 GHz, the Dk variability (typical 4.2 up to a max spec of about 5.2 depending on resin content and glass style) is something to plan around during stack-up.
Physical and Mechanical Properties
| Property | Typical Value |
| Moisture Absorption | 0.12% |
| Flexural Strength (Lengthwise) | 60,000 psi |
| Peel Strength (1 oz Cu, after thermal stress) | 鈮�5 lb/in |
| Flammability | UL 94 V-0 |
| Color | Dark green / phenolic tan |
Core Features That Define Ventec VT-47 PCB Laminate
High Tg Phenolic Cured Resin System
The 180掳颁 Tg is delivered through a phenolic-cured epoxy system rather than the cheaper dicyandiamide (dicy) cure used on conventional 140掳C FR-4. Phenolic cure is what gives VT-47 its better thermal survival, CAF resistance, and lower moisture uptake. If you’re running a design through multiple lead-free reflow cycles, rework, or selective soldering, phenolic cure is what keeps Z-axis expansion under control and stops pad cratering.
CAF (Conductive Anodic Filament) Resistance
CAF is the slow-motion killer of dense BGA designs 鈥� conductive copper filaments migrate along the glass-resin interface between adjacent plated through-holes under bias and humidity, eventually shorting things out. VT-47 is engineered with treated glass and a resin formulation that meets IPC-TM-650 2.6.25 CAF requirements, which matters when your PTH-to-PTH spacing drops below 20 mils.
UV Blocking and Laser Fluorescing
Two features that sound minor until they save your fabrication yield. UV blocking means you can run automated optical inspection (AOI) with UV-based solder mask cure without the laminate itself fluorescing unpredictably. Laser fluorescing, on the other hand, is what lets your AOI system actually detect the board edges and fiducials 鈥� the laminate responds to laser illumination in a controlled way, making it cleaner to image and drill with UV lasers for micro-vias.
Low Z-axis CTE
The 45 ppm/掳C pre-Tg Z-axis expansion is genuinely good for an FR-4 class product. That matters because Z-axis growth is what pulls plated barrels apart during reflow 鈥� the copper plating only stretches so far before the barrel cracks. Low Z-axis CTE directly correlates with better PTH reliability under thermal cycling, especially on boards 10 layers and up.
Ventec VT-47 vs Standard FR-4: The Practical Differences
A side-by-side is the fastest way to see where VT-47 actually wins.
| Parameter | Ventec VT-47 PCB Laminate | Standard FR-4 (140掳C Tg) |
| Glass Transition Temp (Tg) | 180掳颁 | 130鈥�140掳颁 |
| Decomposition Temp (Td) | 355掳颁 | 300鈥�320掳颁 |
| Cure System | Phenolic | Dicy (dicyandiamide) |
| Lead-Free Compatible | Yes | Marginal / No |
| T260 (min) | >60 | 10鈥�30 |
| CAF Resistance | Yes | Variable |
| Z-axis CTE (pre-Tg) | 45 ppm/掳C | 55鈥�70 ppm/掳C |
| Moisture Absorption | 0.12% | 0.15鈥�0.20% |
| Cost | Low-to-mid | Low |
| Typical Use | Lead-free multilayer, auto, medical | Single/double-sided consumer |
The punchline: VT-47 costs roughly 15鈥�25% more than bottom-tier FR-4 but gives you a genuinely lead-free-compatible, multilayer-capable material that will pass IPC Class 2 thermal shock testing without drama.
Applications of Ventec VT-47 PCB Laminate
Automotive Electronics
Under-hood and cabin electronics see brutal thermal cycling 鈥� anywhere from -40掳C to +125掳C ambient, with local hot spots much higher. VT-47 is widely used on engine control modules, body control modules, infotainment boards, and ADAS sensor PCBs where the OEM spec calls for AEC-Q100 compliance at the system level and the board needs to survive ten-plus years of duty cycles.
Telecommunications and Networking
Servers, routers, switches, and base-station line cards. These are typically 8- to 20-layer boards running digital signaling up to a few Gbps, where signal integrity matters but not at the extreme low-Dk level. VT-47’s 4.2 Dk and 0.016 Df are acceptable for most backplane-to-line-card interfaces operating below 1 GHz fundamental, and the thermal reliability handles the dense BGA breakout regions.
Computing Hardware
Desktop and server motherboards, graphics cards, SSDs, and memory modules. The combination of lead-free assembly compatibility, good CAF resistance under bias, and affordable cost makes VT-47 a default choice for mid- to high-layer-count compute boards.
Medical Devices
Patient monitors, imaging equipment peripherals, lab instrumentation. Medical designs demand traceable, UL-recognized materials with consistent electrical properties over a long service life. VT-47’s documented reliability data and IPC-4101 compliance make it easy to qualify under ISO 13485 and IEC 60601 design controls.
Industrial Instrumentation and Controls
PLCs, motor drives, measurement instruments, and precision test equipment. Industrial environments throw vibration, contamination, humidity, and temperature extremes at a board simultaneously. The phenolic cure’s lower moisture uptake and better dimensional stability under temperature make VT-47 a solid fit.
Availability and Construction Options
Thickness and Copper Foil Options
| Construction Parameter | Available Options |
| Core Thickness | 0.002″ (0.05 mm) to 0.200″ (5 mm) |
| Copper Foil Weight | 1/4 oz to 12 oz |
| Copper Foil Type | HTE, Reverse Treated (RT), Double-Side Treated (DST) |
| Form Factor | Sheet or panel |
Practical note: for cores 鈮� 0.005″, Ventec recommends reverse-treated (RT) copper because of its low-profile roughness, which helps with fine-line etching on sequential lamination builds. Keep in mind RT foil has about 1鈥�2 lb/in lower peel strength than standard HTE copper, so if your design has mechanical stress on traces, weigh that trade-off.
E-Glass Prepreg Styles
VT-47 prepreg is available in a wide set of glass cloth styles so you can tune dielectric thickness and resin content per stack-up layer:
| Glass Style | Nominal Thickness (mil) | Typical Use |
| 106 | 1.4 | Thin dielectric, fine-line |
| 1067 | 1.2 | Ultra-thin dielectric |
| 1078 | 1.8 | Thin inner layers |
| 1080 | 2.5 | Standard thin prepreg |
| 1086 | 2.5 | Thin, low resin flow |
| 2113 | 3.1 | Mid-thickness |
| 2116 | 4.7 | Workhorse inner layer |
| 2313 | 3.3 | Medium build |
| 3313 | 3.5 | Balanced construction |
| 7628 | 6.8 | Thick build, rigidity |
Processing Guidelines for Ventec VT-47 PCB Laminate
Giving this to your fab house up front saves a lot of back-and-forth on the first build.
Lamination Press Conditions
| Parameter | Specification |
| Heating Rate (Programmable Press) | 1.5鈥�3.0掳C/min (3鈥�5掳F/min) |
| Heating Rate (Manual Press) | 3鈥�6掳C/min (5鈥�10掳F/min) |
| Cure Temperature & Time | >60 min at material temp >185掳C (365掳F) |
| Full Pressure | 鈮�300 psi (250鈥�300 psi acceptable) |
| Vacuum Duration | Continue until material temp >140掳C (284掳F) |
| Cold Press | 100 psi for 60 min at room temp |
Typical Drilling Parameters (脴 0.3鈥�1.0 mm)
| Parameter | Range |
| Spindle Speed | 120鈥�180 KRPM |
| Feed Rate | 120鈥�220 inch/min |
| Retract Rate | 596鈥�1000 inch/min |
| Chip Load | 0.6鈥�2.0 mil |
Undercut drill bits have been shown to improve quality on smaller holes. For PTH-heavy designs, pay close attention to chip load 鈥� phenolic-cured resin cuts a little harder than dicy FR-4.
Desmear and Storage
Desmear rate on VT-47 is slower than conventional FR-4 because the phenolic cure is tougher. Plan for minor adjustments to permanganate dwell times 鈥� talk to your chemical supplier. For storage, prepreg keeps 3 months at <23掳C and <55% RH, laminates keep 6 months. Vacuum-sealed, laminates extend to 12 months. Bake finished PCBs at 125掳C for 4鈥�6 hours before assembly if they’ve been stored more than 3 months.
Useful Resources for Engineers and Buyers
| Resource | What You’ll Find | Link |
| Ventec Official VT-47 Page | Official product page and latest datasheet revision | |
| VT-47 Datasheet (Rev B3, PDF) | Full IPC-4101D-WAM1 compliance data | |
| UL Online Certifications Directory | Look up UL file E214381 | |
| IPC-4101 Slash Sheet Standards | Spec reference for laminate grades | |
| Ventec PCB Fabrication Services | Custom Ventec PCB manufacturing quotes | Ventec PCB |
| PCB-Directory VT-47 Listing | Alternate datasheets and pricing |
Frequently Asked Questions
Is Ventec VT-47 PCB laminate suitable for lead-free assembly?
Yes, without qualification. VT-47’s phenolic-cured resin system, 180掳颁 Tg, 355掳颁 Td, and T288 rating of more than 30 minutes are specifically designed for the thermal load of lead-free SAC305 reflow at 260掳C peak. It survives multiple reflow cycles and selective rework without the delamination problems typical of old dicy FR-4.
What’s the difference between Ventec VT-47 and standard FR-4?
The headline difference is thermal performance. VT-47 runs at 180掳颁 Tg versus 130鈥�140掳颁 for standard FR-4, uses phenolic cure versus dicy cure, offers CAF resistance, and has lower Z-axis CTE. Practically, VT-47 is the material you use when you need lead-free multilayer reliability; standard FR-4 is fine for simple consumer single- or double-sided boards assembled with leaded solder.
Can Ventec VT-47 be used for high-speed or RF designs?
Generally no for true high-speed work. With a Dk of ~4.2 and Df of 0.016 at 1 GHz, VT-47 is a standard-loss material. Below 1 GHz it’s fine. Above 1 GHz insertion loss starts eating your signal budget, and you should look at low-loss or mid-loss laminates such as Ventec’s VT-901 series, Isola FR408HR, or Rogers RO4000 family depending on your frequency and cost target.
What copper foil options does Ventec VT-47 support?
Copper weights from 1/4 oz up to 12 oz in HTE, reverse treated (RT), or double-side treated (DST) foil. For thin cores of 0.005″ or less, reverse treated copper is recommended because of its low-profile surface, which yields cleaner fine-line etching 鈥� at the cost of roughly 1鈥�2 lb/in lower peel strength.
What industries most commonly use Ventec VT-47 PCB laminate?
Automotive electronics (ECMs, BCMs, infotainment), telecommunications (routers, switches, line cards), computing (motherboards, GPUs, SSDs), medical devices (patient monitors, imaging peripherals), and industrial instrumentation (PLCs, drives, test equipment). Any design that needs lead-free multilayer reliability without the expense of polyimide or specialty high-speed laminates is a candidate.
Closing Notes from the Bench
If I’m writing a stack-up today for a 6- to 14-layer board that has to survive lead-free reflow and a reasonable thermal-cycle spec, VT-47 is the default I pencil in before looking at anything more exotic. It’s not glamorous, it’s not the lowest-Dk material on the market, and it won’t win any signal-integrity awards above 1 GHz 鈥� but it’s well-characterized, UL-recognized, widely stocked by global fabricators, and priced where a realistic BOM can absorb it.
The important thing is matching material to mission. If your design needs sub-0.005 Df for serdes above 10 Gbps, look elsewhere. If it needs 250掳C continuous operation, look at polyimide. For everything in between 鈥� which is most industrial, automotive, medical, and computing PCBs 鈥� Ventec VT-47 PCB laminate is exactly the kind of workhorse material you want on the drawing.
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