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Use the product table at the relevant frequency

The official I-Speed page lists typical DSC Tg of 180掳C and Td of 360掳C. At 10 GHz it gives Dk 3.63 and Df 0.0060 in Bereskin stripline context. Its current integrated expansion table differs from some older guide values, so preserve the exact source revision rather than combining them.

These typical measurements support screening. They do not prescribe an operating temperature, a trace width or a complete channel loss. The actual glass construction, resin content and copper must be represented in the electrical model used for layout.

Evidence and construction decision

Compare two routes with identical boundaries

Candidate A and candidate B should use the same routing length, frequency, reference planes and discontinuity scope. Enter complete measured or validated modeled line attenuation, including the copper contribution. Comparing one dielectric-only estimate with another supplier's full insertion loss is not a valid material tradeoff.

The tool multiplies each attenuation rate by a common length and reports the difference. It also subtracts the two user-entered unit allowances. It does not combine the outputs into an approval score, because a dB of margin and a currency unit do not have a universal exchange rate.

Read the example as arithmetic, not a price recommendation

For a hypothetical 10 inch route, 1.0 dB/in and 0.6 dB/in produce a 4 dB routing difference. Entered allowances of 20 and 27 in the same currency produce a difference of 7. Neither number is a current I-Speed price or an automatic reason to select the second construction.

Decide whether the electrical difference closes a documented requirement. If both candidates already have adequate verified margin, manufacturing tolerance, supply and qualification may influence the decision. If neither meets the channel boundary, the design needs more than a price comparison.

Matched construction loss and allowance comparison

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.

Inspect copper and transitions before blaming the resin

Trace profile, foil roughness, via architecture and connectors can dominate parts of the channel. A material change may not repair an avoidable transition problem. Keep the proposed copper type and geometry with the comparison so that the cause of an improvement is visible.

Tachyon 100G provides a separate complete-budget workflow. N4000-13 provides an exact epoxy-family comparison whose SI suffix must not be omitted. Use those routes only where the visitor's actual design question calls for them.

Keep chemical and thermal requirements in the decision

If halogen composition is fixed by the project, a specific IS 580G review addresses its documented handling and material context. Do not infer chemical compliance from a low-loss label, and do not infer low loss from a high thermal rating.

Compare the full manufacturing proposal: quantity, layer stack, copper, finish, testing and permitted alternatives. The optional budget worksheet separately adds one-time and recurring allowances. It remains uncalibrated arithmetic and does not issue a quotation.

Prepare an I-Speed inquiry with an answerable comparison

Send the exact stackup and copper requirements, frequency or interface boundary, route length, simulation or measurement basis and the budget that matters. Include board dimensions, quantity and evidence requirements. State which alternatives can be reviewed and who approves them.

The useful outcome is a proposed construction with explicit exceptions and a verification plan. Save the approved model and manufacturing revision together. A local calculator result is a planning record; it is not proof that the completed interconnect meets the customer's interface requirements.

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.