Taconic TLC-30 PCB: Properties, Design & Cost

What Is Taconic TLC-30 PCB Material?

Taconic TLC-30 is a woven-fiberglass-reinforced PTFE composite laminate with a nominal dielectric constant (Dk) of 3.00 ± 0.04 and a dissipation factor (Df) of 0.0030 at 10 GHz. A Taconic TLC-30 PCB targets RF and microwave circuits up to roughly 10 GHz where designers need better electrical performance than FR-4 but cannot justify the cost of ceramic-filled or pure PTFE laminates. TLC-30 is part of Taconic’s TLC family, which uses a mechanically stable glass-PTFE construction that processes more like a conventional epoxy laminate than a loose PTFE sheet.

The material ships with electrodeposited (ED) copper in standard weights of ½ oz (17 µm) and 1 oz (35 µm), on core thicknesses from 5 mil (0.127 mm) to 60 mil (1.524 mm). Its coefficient of thermal expansion (CTE) in the Z-axis is approximately 250 ppm/°C, and it can withstand multiple lead-free reflow cycles at 260 °C without delamination—a critical requirement for modern RoHS-compliant assembly.

Key Electrical and Mechanical Properties of Taconic TLC-30 PCB

The Dk of 3.00 makes impedance calculations straightforward—microstrip trace widths for 50 Ω on a Taconic TLC-30 PCB are slightly narrower than on a Dk 3.48 laminate like RO4350B, giving a small routing-density advantage. The low moisture absorption of 0.02 % means Dk drift in humid environments is negligible, a meaningful benefit for outdoor antenna feeds and marine radar front-ends.

Where TLC-30 Fits: Application Sweet Spots

GPS, GNSS, and Navigation Antennas

L-band patch antennas at 1.575 GHz benefit from TLC-30’s stable Dk and low loss. A patch element sized for Dk 3.00 on a 60 mil core yields a half-wavelength resonator of about 38 mm, compact enough for vehicle-mount housings while keeping antenna efficiency above 80 %.

Wi-Fi and ISM-Band Power Amplifier Boards

At 2.4 GHz and 5.8 GHz, TLC-30’s Df of 0.0030 keeps insertion loss well under 0.02 dB/mm for typical 50 Ω microstrip. This is more than adequate for PA matching networks and coupler circuits in industrial IoT gateways.

Low-Cost Radar Sensors (S-band and C-band)

Marine radar and weather-radar IF boards running at 3–6 GHz can use TLC-30 as a drop-in alternative to more expensive ceramic-filled PTFE laminates, with only a marginal increase in line loss.

Where TLC-30 Is Not the Right Choice

Above roughly 10 GHz, the woven-glass reinforcement introduces fiber-weave effects that increase Dk variation across the board. For millimeter-wave designs—77 GHz automotive radar, 5G mmWave front-ends—look at non-woven or ceramic-filled options such as Taconic FastRise 27 or Isola Astra MT77.

TLC-30 vs. Other Dk 3.0 Laminates

Several laminates share the Dk 3.0 design point. The table below compares a Taconic TLC-30 PCB against two common alternatives to help you make a material-selection decision.

Choose TLC-30 when your operating frequency stays below 10 GHz and budget matters more than the last tenth of a dB in line loss. Choose Taconic TSM-DS3 when you need the same Dk but half the loss tangent for Ku-band or similar mid-frequency work. Choose Rogers RO3003G2 when loss budget is extremely tight or you need the tightest Dk uniformity across a large-format panel for phased-array feeds.

For designs where Dk 3.0 is not essential and a slightly higher value is acceptable, Taconic TLC-32 (Dk 3.20) offers another cost-effective option in the same TLC product family.

Fabrication Guidelines for Taconic TLC-30 PCB Builds

Drilling

TLC-30’s woven-glass reinforcement drills cleanly with standard carbide bits. Use entry and backup boards as you would for FR-4. Recommended drill spindle speed is 150,000–180,000 RPM with a chip load of 0.5–1.0 mil per revolution. PTFE smear is less of a concern than with pure PTFE substrates, but a sodium-etch or plasma desmear cycle is still recommended before plating to ensure reliable barrel adhesion.

Plating and Surface Finish

The ED copper foil bonds well enough for standard electroless-copper and electrolytic-copper plating sequences. ENIG, immersion silver, and OSP are all compatible. For edge-launched RF connectors requiring wire bonding, consider ENEPIG for gold-wire compatibility.

Lamination and Hybrid Stackups

TLC-30 can be laminated with Taconic’s TacBond or FR-4 prepregs to create hybrid stackups—RF layers on TLC-30 with digital layers on standard FR-4. When building a hybrid, match the CTE profiles as closely as possible and use a symmetrical stackup to prevent warpage. A common four-layer hybrid is: TLC-30 core (RF signal + ground), FR-4 prepreg, FR-4 core (power + digital signal).

Etching Tolerances

Because microstrip widths on Dk 3.0 material are narrower than on higher-Dk substrates for the same impedance, etch tolerance matters. On a 20 mil (0.508 mm) TLC-30 core with ½ oz copper, a 50 Ω microstrip is roughly 49 mil (1.24 mm) wide. A ± 1 mil etch tolerance shifts impedance by about ± 1 Ω—acceptable for most sub-6 GHz designs but worth verifying with a cost-versus-tolerance trade-off analysis on tighter builds.

Managing NRE Costs on TLC-30 Projects

Non-recurring engineering (NRE) charges—tooling, test fixtures, stencils—can dominate unit cost on low-volume Taconic TLC-30 PCB runs. Understanding how those charges split across a prototype batch helps you decide whether to consolidate panel tooling or run multiple small lots. Enter your expected NRE fees and quantity below to see the per-unit NRE burden.

For example, if total NRE is $1,200 and you order 50 boards, each unit carries a $24 NRE overhead. Doubling the order to 100 boards halves that to $12. On a cost-sensitive TLC-30 project, pushing the first run to a slightly higher quantity often pays for itself by diluting fixed charges. If the per-unit NRE exceeds the bare-board cost, it is almost always worth increasing the order or combining NRE with a second design revision.

Amortizing Tooling Across Production Runs

Tooling for RF boards—drill programs, impedance-test coupons, routing fixtures—represents a one-time investment that can be spread across multiple production lots. The calculator below shows how tooling cost per board drops as cumulative volume grows over successive orders.

Suppose your drill and route tooling costs $800. Over a first run of 100 boards, that is $8.00 per unit. By the time you have ordered 500 boards across three production lots, the amortized tooling cost drops to $1.60. For Taconic TLC-30 PCB projects expected to reach moderate production volumes—say, 300–1,000 units per year—it is worth investing in proper impedance coupons and panelization from the start rather than re-tooling later.

Design Tips for Optimal TLC-30 Performance

• Ground-plane stitching: Place stitching vias at λ/20 spacing or tighter along microstrip-to-stripline transitions to suppress parallel-plate modes. At 6 GHz on Dk 3.0, λ/20 ≈ 1.45 mm.
• Fiber-weave skew mitigation: Rotate trace routing 5–10° off the warp direction to average out Dk variation caused by the glass weave. This matters most for long matched-length differential pairs.
• Copper roughness correction: ED copper on TLC-30 has an Rz roughness of roughly 3–5 µm. At 10 GHz, apply a Hammerstad-Jensen or Huray roughness correction of 0.3–0.5 dB/inch to your simulation; otherwise insertion-loss predictions will be optimistic.
• Solder-mask keep-out: Avoid solder mask over 50 Ω traces above 3 GHz. Mask adds roughly 0.02 Dk equivalent and can shift impedance by 1–2 Ω, enough to degrade return loss on tightly matched networks.

Comparing TLC-30 to Non-Taconic Alternatives

If your supply chain favors a different vendor, hydrocarbon ceramic laminates from multiple manufacturers can serve the same frequency range. Shengyi’s S7136 and Wangling’s F4BM are two examples from the Asia-Pacific supply base that target cost-sensitive RF work, though their Dk values differ (typically 3.4–3.6 and 2.2–2.65, respectively). TLC-30’s advantage is hitting exactly Dk 3.00 with PTFE-grade moisture resistance—important for outdoor enclosures without hermetic sealing.

For deeper material-cost benchmarking across these families, see the RF laminate price guide.

Standards and Qualification

TLC-30 meets IPC-4103 slash-sheet requirements for PTFE/woven-glass laminates and carries a UL 94 V-0 flammability rating. For aerospace or defense programs requiring QPL-listed materials, confirm the specific slash sheet with Taconic’s applications engineering team, as not every thickness and copper combination is pre-qualified.

Taconic publishes detailed datasheets through their TLC laminate series product page, including full CTE curves, peel-strength data by copper type, and recommended processing parameters.

Frequently Asked Questions

Can TLC-30 be used in multilayer RF stackups?

Yes. TLC-30 cores can be laminated into multilayer builds using Taconic TacBond bondply or compatible low-flow prepregs. Symmetrical stackups with matched CTE are essential to avoid warpage during reflow.

What is the maximum operating frequency for a Taconic TLC-30 PCB?

Taconic rates TLC-30 for applications up to approximately 10 GHz. Beyond that, fiber-weave effects increase Dk variation and insertion loss rises faster than on non-woven alternatives. For Ku-band and above, consider TSM-DS3 or ceramic-filled PTFE substrates.

Is TLC-30 RoHS compliant?

TLC-30 is compatible with lead-free soldering at 260 °C peak reflow and does not contain restricted substances under EU RoHS Directive 2011/65/EU. Confirm specific compliance documentation with your laminate distributor for each lot.

How does a TLC-30 PCB compare to FR-4 for RF?

Standard FR-4 has a Dk around 4.2–4.5 and Df of 0.018–0.025 at 1 GHz, both of which degrade rapidly above 1 GHz. TLC-30’s Dk of 3.00 and Df of 0.0030 at 10 GHz offer roughly 8–10× lower dielectric loss, making it suitable for circuits where FR-4 would introduce unacceptable insertion loss or impedance drift.

What copper foil options are available?

TLC-30 ships with standard ED copper in ½ oz and 1 oz weights. Rolled-annealed (RA) copper or reverse-treated foil (RTF) can be specified for lower conductor loss at higher frequencies, though lead times may increase.