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Keep the current source revision with the electrical model

The official product page lists a typical Dk of 3.02 at 10 GHz and Df of 0.0021, with separate test-method context. Its revision history records a Df method correction in March 2026. A downloaded older PDF and the current page may therefore have different documentation details.

Use one controlled source revision in the design record. Do not average conflicting tables or retain the most favorable value from each. If the material model came from a supplier simulation file, record its construction and extraction basis alongside the published characterization.

Evidence and construction decision

Specify copper and glass instead of only naming the resin

The product information includes smooth-copper options and spread-glass constructions. Those choices matter to the electrical proposal. A quote that changes the foil profile or dielectric construction can change the complete line loss even while retaining Tachyon 100G in the material field.

State copper type, finished thickness, glass construction and critical dielectric intervals. Ask for proposed changes before routing dimensions are frozen. Spread glass may help address local dielectric variation, but it is not a substitute for evaluating the actual differential-pair geometry and timing requirements.

Allocate a channel budget at one defined frequency

The tool subtracts fixed discontinuity allowance and reserved margin from a user-entered total loss budget. It then compares the remaining allocation with complete routing attenuation per unit length. The example uses 20 dB total, 5 dB fixed, 3 dB margin and 1 dB/in routing loss; a 10 inch route leaves 2 dB.

All figures are hypothetical and must share a frequency and reference-plane definition. The model does not sum a material Df directly into channel loss. It also does not validate return loss, crosstalk, equalization or an interface compliance mask.

Channel loss budget at one frequency

Optional cost comparison from your own allowances

Use a quotation or a clearly labeled internal assumption for each input. Keep the quantity, construction and inspection scope the same when comparing alternatives. This uncalibrated planning model adds entered values; it contains no current market rates and does not issue a 吃瓜tv quotation. You can contact the team without completing it.

Decide whether the board needs a different material or a shorter route

If the routing allocation is insufficient, first inspect the assumed connector, via and package contributions. A premium dielectric cannot remove a severe discontinuity. Shorter routes, better transitions or a different stackup may change the decision more effectively than a material-only substitution.

Compare I-Speed for a matched cost-versus-loss exercise or TerraGreen 400G2 for an exact-suffix low-loss route. Keep the same channel boundary when comparing alternatives, otherwise the numerical difference can be misleading.

Separate RF phase requirements from digital channel requirements

IS 680 owns the RF dielectric-option and phase-planning task. A digital backplane and a resonant RF circuit may both need low loss but use different model and verification methods. Select the relevant evidence rather than assuming one material ranking serves every application.

For procurement, compare the same quantity, copper construction, layer architecture and testing. The optional allowance model has no supplier price database. Include qualification and coupon work explicitly when they are part of the proposed build.

Request a reviewable high-speed stackup

Provide the lane requirements, frequency or channel specification, reference planes, proposed stackup, trace geometry and transition data. Include the exact material and foil requirement, quantity, assembly history and acceptable substitution policy.

A useful reply identifies a construction that can be analyzed and the evidence required before release. It does not promise a data rate from the product name alone. Keep the approved stackup, model revision and electrical verification boundary together for repeat production.

Tie the exact grade to an electrical construction

State the channel reference planes, frequency range, routing length, copper construction, transitions and interface assumptions together. A laminate loss-tangent value is one input to that system. It is not a complete insertion-loss measurement or a guarantee that a data rate will work.

Use comparable measurement or modeling conditions when screening alternatives. Material changes can require geometry changes to preserve impedance, and copper roughness can alter the result independently of the resin system. Keep the proposed stackup and the channel analysis synchronized through fabrication review.

For procurement, identify the properties that are fixed and the alternatives that can be evaluated. Request evidence at the relevant construction and frequency rather than a broad low-loss label. Compare total delivered scope and validation effort alongside material price. A shorter or better-routed channel may change the tradeoff more than replacing a material name alone.

A useful design-data record retains both the material value and the reason it was selected. State whether the value is supplier characterization, a construction-specific design input, a measured coupon extraction or an early assumption. These sources are not interchangeable. Keep frequency, method and specimen information visible when a comparison uses more than one document.

The tool on this page starts empty because a plausible default can otherwise be mistaken for a verified grade profile. Use the example to understand the units, then replace it with project inputs. A result with many decimal places does not imply that the material or routing-loss input is known to that precision.

For a high-speed design, plan how the model will be checked. Reference planes, coupon geometry, fixtures and the acceptance boundary determine what a measurement means. A coupon that characterizes one line construction does not automatically qualify every route or transition on the board.

Keep the commercial comparison aligned with the engineering one. Quantity, copper, layer structure, test deliverables and qualification effort should be comparable. A lower material allowance can be irrelevant if the proposed construction cannot meet the channel requirement, while a premium grade may be unnecessary if the actual route already has sufficient validated margin.