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Use the manufacturer's data as a starting point

The current product introduction lists Dk 3.8 and Df 0.0080 for IT-170GRA2 on its 50% resin-content basis. Those headline values belong to the stated characterization context. Obtain the exact technical sheet and frequency/method information before assigning solver inputs to a particular core or bonding interval.

The neighboring IT-170GT has its own entry and scope. Similar names do not establish equal glass construction, copper options or process behavior. Keep the proposed material and its supporting data together in the comparison.

Material facts and decision boundaries

Allocate the channel before comparing laminates

Identify the reference planes and the loss limit at a named frequency. Separate packages, connectors, transitions and routing, then reserve an explicit engineering margin. Compare complete routing loss only when the geometries and measurement or simulation boundaries are compatible.

A construction with lower dielectric loss can still be limited by copper roughness or transitions. If only a material Df is available, do not label a derived estimate as measured complete line loss. Record which input is evidence and which remains an assumption.

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.

Make the cost comparison explain the benefit

The worksheet compares two entered routing-loss rates over the same length and two entered unit allowances. The example uses 10 inches at 1.0 versus 0.6 dB/in: a 4 dB route-loss difference. Its 20 and 27 allowance units are hypothetical, not IT-170GRA2 prices.

The result is a transparent arithmetic comparison, not an automatic material recommendation. A useful decision asks whether the recovered margin solves the actual channel problem and whether the commercial figures include the same quantity, copper and verification scope.

Preserve the glass and copper construction

Record resin content, glass style, finished dielectric separation, copper profile and modeled trace geometry. A change in any of those can alter the relationship between a material chart and the final channel. Ask for the proposed stackup before freezing routing dimensions.

Compare IT-958G only with compatible construction evidence. A lower chart Df is a reason to investigate a candidate, not proof of a finished-board loss improvement of a particular percentage.

Review HDI requirements independently

When the board uses small dielectric openings or sequential lamination, define those requirements separately from the channel model. The IT-168G2 opening guide explains the geometric conventions that need to be stated for an HDI review.

Do not infer that a successful electrical simulation approves a microvia process. Likewise, a fabricator's geometric proposal does not validate the full interface. Agree the representative structures and evidence needed for each part of the design.

Send a matched-construction quotation request

Provide the IT-170GRA2 callout, frequency or interface requirement, proposed stackup, longest critical route, board dimensions and quantity. Include copper, finish, test requirements and the alternatives you are willing to evaluate.

Ask the response to preserve the channel boundary and explain any construction changes. The online comparison stays local and can be attached manually. 吃瓜tv's project review and quotation depend on the actual files and agreed scope; neither current material availability nor an interface pass is implied by the worksheet.

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.