RT5880 vs TLY-5: PTFE Laminate Comparison

RT5880 vs TLY-5: The Short Answer

Rogers RT/duroid 5880 and Taconic TLY-5 are both glass-microfiber-reinforced PTFE laminates targeting a nominal Dk of 2.20 at 10 GHz. When engineers evaluate RT5880 vs TLY-5, the datasheets look nearly identical—same Dk, same Df of 0.0009, same reinforcement type. RT/duroid 5880 is the longer-established industry standard with tighter lot-to-lot Dk consistency and broader qualification history. TLY-5 offers comparable electrical performance at a lower price point and shorter lead time, making it a practical second source for many designs below 40 GHz. The choice usually comes down to how tightly you need Dk controlled, whether your end customer mandates a specific QPL, and what your budget allows.

Why Dk 2.2 PTFE Matters in RF Design

A dielectric constant near 2.2 is the sweet spot for many microwave circuits. It keeps microstrip line widths wide enough to etch reliably, minimizes dielectric loss, and produces a wave velocity close to free space—simplifying antenna feed networks and filter designs. Both RT/duroid 5880 and TLY-5 sit in this niche, competing directly for applications such as satellite feeds, phased-array antenna elements, and test fixtures up into millimeter-wave bands.

If you are weighing these PTFE options against entirely different chemistries, the broader PTFE versus hydrocarbon laminate comparison explains when a non-PTFE route makes sense.

RT5880 vs TLY-5 Material Properties Compared

The table below pulls key parameters from the current Rogers and Taconic datasheets. All values are typical at 10 GHz and room temperature unless noted.

On paper the two laminates look nearly interchangeable. The meaningful differences in the RT5880 vs TLY-5 debate emerge in tolerance consistency lot to lot, foil options, supply chain depth, and qualification pedigree—all discussed in the sections that follow.

Dielectric Constant Stability and Dk Drift

Both materials claim Dk = 2.20 ± 0.02 at 10 GHz, but real-world Dk drifts with temperature and frequency. RT/duroid 5880 has been characterized extensively in published literature; its Dk shifts roughly +0.005 from −55 °C to +125 °C and remains within ±0.01 from 1 GHz to 40 GHz. TLY-5 shows similar trends but with somewhat less publicly available characterization data above 30 GHz.

For designs where even a 1 % Dk shift matters—think narrowband filters or phased-array beam squint budgets—use the estimator below to see how temperature excursions affect your effective Dk.

If you enter Dk = 2.20 with a temperature swing from +25 °C to +85 °C, you will typically see an estimated drift under 0.01 for PTFE-microfiber composites. That drift translates to roughly a 0.2 % shift in microstrip impedance—usually negligible for broadband antennas but potentially significant for coupled-resonator filters with fractional bandwidths below 2 %. In those cases, request lot-specific Dk test coupons from whichever vendor you choose.

Loss Tangent and Insertion Loss

Both RT/duroid 5880 and TLY-5 quote Df = 0.0009 at 10 GHz, placing them among the lowest-loss substrates available. At 77 GHz the loss tangent of PTFE-microfiber laminates typically rises to approximately 0.002–0.003, still far below FR-4 (Df ≈ 0.025 at 10 GHz). For a sense of scale, see the Rogers versus FR-4 loss comparison.

Conductor loss dominates total insertion loss on thin substrates (≤ 10 mil / 0.254 mm) at frequencies above 20 GHz. Rogers offers RT/duroid 5880 with its LoPro™ reverse-treated copper foil (Ra ≈ 0.3 µm RMS), which reduces conductor loss by 15–25 % compared to standard electrodeposited foil. Taconic does not currently offer TLY-5 with an equivalent branded low-profile foil, though custom foil laminations can be requested. This is one of the clearest technical differentiators favoring RT/duroid 5880 in millimeter-wave designs.

Fabrication and Processing

Drilling and Plating

PTFE is inherently non-wettable, which means plated-through holes require surface treatment before electroless copper deposition. Both RT/duroid 5880 and TLY-5 need either sodium-naphthalene etch or plasma treatment to activate the PTFE surface. Fabricators experienced with one material can process the other with no tooling changes. For a deeper dive into the etch methods and their reliability implications, see the plasma versus sodium etch comparison.

Dimensional Stability

Both materials use random glass-microfiber reinforcement rather than woven glass. This gives them more isotropic in-plane behavior than woven-glass PTFE (like Rogers RT/duroid 6002), but it also means lower rigidity. Panels thinner than 20 mil (0.508 mm) need careful handling during lamination and routing. Neither material is significantly better or worse here; both require the same fabrication precautions.

Hybrid Stackups

Cost-sensitive designs often pair a PTFE RF layer with FR-4 or polyimide structural layers. RT/duroid 5880 has well-documented bonding compatibility with Rogers bondply films (2929, 3001). TLY-5 is typically bonded with Taconic’s FastRise 27 prepreg or generic FEP bondply. If your stackup mixes brands, confirm the bondply’s Dk and Df so the transition does not introduce an impedance discontinuity. For an overview of how different material families combine, the RF laminate comparison hub is a useful starting point.

Supply Chain, Lead Time and Cost

This is where the RT5880 vs TLY-5 comparison diverges most sharply in practice.

• Rogers RT/duroid 5880 is stocked by virtually every major RF laminate distributor worldwide. Lead times for standard thicknesses (10, 20, 31, 62 mil) on 18 × 24 in panels are typically 2–4 weeks from distribution. Custom thicknesses or LoPro foil variants may take 6–10 weeks from the factory.
• Taconic TLY-5 is stocked in fewer locations but Taconic’s domestic (U.S.) manufacturing often enables faster factory lead times—sometimes under 3 weeks for standard builds. Taconic is generally more flexible on minimum order quantities for prototyping.
• Pricing: TLY-5 is typically 15–30 % less expensive than RT/duroid 5880 on a per-panel basis for equivalent thickness and copper weight, though the gap narrows on large-volume contracts where Rogers offers tiered pricing. Neither vendor publishes list prices; request quotes for your specific panel size and volume.

For designs where you are evaluating whether a lower-cost alternative could replace RT/duroid 5880 entirely, the RT/duroid 5880 versus Wangling F4B comparison covers a more aggressive cost-reduction path and its trade-offs.

Selecting the Right Taconic Grade

Taconic’s TLY family includes several variants—TLY-5, TLY-5A (tighter Dk tolerance), and TLY-3 (Dk 2.33). If you are new to the Taconic portfolio or considering other grades for adjacent designs, the selector below helps narrow the options based on your frequency, loss budget and thickness requirements.

After entering your operating frequency and target Dk, the tool recommends the closest Taconic grade. For most RT5880 vs TLY-5 evaluations seeking a direct substitute, it will point to TLY-5 or TLY-5A. If your Dk target is slightly higher—say 2.33 for a more compact antenna element—TLY-3 appears as the match, analogous to Rogers RT/duroid 5870. That comparison is detailed in the RT/duroid 5880 versus 5870 guide.

Application Fit: Choose 5880 When… Choose TLY-5 When…

Choose RT/duroid 5880 when:

• Your customer or program specification names RT/duroid 5880 explicitly (common in defense, aerospace and space-qualified designs).
• You need LoPro™ or other specialty foil options for millimeter-wave frequencies above 40 GHz.
• Your design requires lot-to-lot Dk traceability backed by decades of published characterization data.
• You are building hybrid multilayers using Rogers bondply and want a single-vendor material stack.

Choose Taconic TLY-5 when:

• Your design operates below 40 GHz and does not carry a material-specific QPL requirement.
• Budget is a primary constraint and 15–30 % material savings are meaningful at your volume.
• You need rapid prototyping with small panel quantities and flexible MOQs.
• You are designing commercial products (VSAT terminals, point-to-point links, industrial radar) where second-sourcing flexibility matters more than heritage qualification.

Qualification and Standards

RT/duroid 5880 is referenced in numerous Rogers application notes and datasheets and has a long qualification history under MIL-spec programs. Taconic TLY-5 meets IPC-4103 slash-sheet requirements for PTFE/glass-microfiber laminates, and Taconic holds ISO 9001 certification for its manufacturing processes. For commercial designs, IPC-4103 compliance is generally sufficient; for defense or space, check whether the program’s qualified products list specifically calls out a Rogers part number.

Common Pitfalls in the RT5880 vs TLY-5 Decision

• Assuming identical performance above 60 GHz. Published Dk/Df data for TLY-5 thins out above 40 GHz. If your design operates at 60 GHz or 77 GHz, request measured data from Taconic or perform your own ring-resonator characterization before committing.
• Ignoring foil roughness. At W-band, conductor loss can exceed dielectric loss by 3:1 on standard ED foil. The availability of LoPro on RT/duroid 5880 is a real advantage here, not a marketing detail.
• Mixing bondply vendors without checking Dk. A generic FEP bondply (Dk ≈ 2.1) bonding TLY-5 layers is close in Dk, but some lower-cost bondplies have Dk near 2.6–2.8, creating a buried impedance step.
• Over-specifying material when the design does not need it. For a 2.4 GHz patch antenna on a 62-mil substrate, both materials are overkill—standard FR-4 or a ceramic-filled hydrocarbon may suffice at a fraction of the cost.

Frequently Asked Questions

Can TLY-5 be a drop-in replacement for RT/duroid 5880?

Electrically, yes—for most designs below 40 GHz the Dk, Df and thickness options overlap closely enough that no layout change is required. Verify that your fabricator’s PTFE processing (drilling, surface prep, plating) is qualified for Taconic materials, and confirm bondply compatibility if building multilayers.

Which material has lower loss at 77 GHz?

Dielectric loss is essentially the same. The difference at 77 GHz comes from conductor loss: RT/duroid 5880 with LoPro foil will show measurably lower total insertion loss than TLY-5 on standard ED copper. If Taconic laminates TLY-5 with a comparable low-profile foil on request, the gap closes.

Is TLY-5 available in thin laminates for mmWave?

Yes. Taconic offers TLY-5 down to 4 mil (0.102 mm), one step thinner than Rogers’ standard 5 mil (0.127 mm) minimum for RT/duroid 5880. Handling and registration become critical at these thicknesses regardless of vendor.

Do both materials meet IPC-4103?

Both are PTFE/glass-microfiber composites that fall under IPC-4103 slash sheets for that material class. Specific slash-sheet numbers differ; confirm the correct one with each vendor for your procurement documentation.

What is the typical cost difference in the RT5880 vs TLY-5 comparison?

TLY-5 is generally 15–30 % less expensive per panel than RT/duroid 5880 at prototype and low-volume quantities. At high volume the gap narrows. Always quote both materials in parallel to get current pricing for your specific configuration.