1. Separate Resolution from Accuracy
Ask the design owner what temperature the product needs to measure and how close the reported result must be to that requirement. Keep the target, relevant operating interval and system reference together. A request for a high-resolution sensor can leave the actual measurement requirement undefined, even when purchasing knows its interface and package.
TI's TMP117 datasheet presents temperature resolution separately from temperature accuracy. Resolution describes the reported step, while the accuracy table supplies error-related limits under specified conditions. Keep those fields on separate rows. Increasing the detail in a displayed temperature value is not, by itself, evidence that the required accuracy has been established.
Preserve the released component as the starting point for a candidate review. Record the required accuracy basis before looking for a more attractive resolution headline. If engineering has not defined the requirement, mark it pending rather than replacing it with the finest digital step found in a supplier description.
Also distinguish the component requirement from the finished product's measurement target. Ask which evidence the engineering team needs for each decision. The sensor specification can support component selection, while the product's complete measurement requirement should remain identifiable through the design and validation process.
2. Retain Variant Range and Test Conditions
Locate the exact device and variant in the relevant accuracy table. TMP117 documentation separates variant entries and temperature intervals. Keep the interval attached to the entry being considered instead of applying one headline across an unrelated range. A requirement extending beyond the reviewed interval needs its own applicable evidence.
Read the table heading together with row-specific conditions. The TMP117 electrical-characteristics section identifies common supply and temperature conditions, then attaches further configuration and test context to its accuracy entries. Retain the conditions that actually apply, including a note that overrides a common heading, rather than treating the table as one unconditional specification.
Ask engineering to compare that basis with the intended operating configuration. Record differences in temperature range, supply, conversion configuration or package-related test context where they matter to the review. This is a request to establish applicability, not a prediction of the error produced by a changed configuration.
If the selected variant or condition cannot be matched, leave the accuracy comparison incomplete. Do not fill the gap with another row from the family or an unexplained distributor summary. Preserve the actual document revision and entry so the technical owner can see exactly what was reviewed.
3. Keep Typical Values and Limits Distinct
Carry the minimum, typical and maximum headings into the comparison instead of retaining only the centre value. The TMP117 table uses these classifications alongside its conditions. Ask the reviewer which specified bounds answer the application requirement and which entries offer typical context. A typical figure should not silently become the required limit.
Compare corresponding fields on a common basis. A candidate's typical error under one condition and another device's limit across a wider interval are different pieces of evidence. Record the mismatch rather than ranking the devices by whichever detached number appears smaller. Keep the reviewer responsible for deciding whether the comparison is sufficient.
Treat an unpopulated field as missing information, not as zero error. Request the appropriate manufacturer clarification or other engineering evidence where needed. This checklist performs no error-budget arithmetic, distribution estimate or curve-derived calculation. The task is to preserve the specification basis before a sourcing decision is made.
Keep any existing measurement report distinct from catalogue entries. Retain the identified device, board revision, method, conditions and coverage the report actually states. A result from one assembly or configuration should not be relabelled as a universal value for every offered device or a guarantee for another product.
4. Separate Sensor Selection from System Validation
Prepare an accuracy review record with the required interval, selected variant, applicable specification row, classification and remaining conditions. Identify which items are confirmed and which require engineering input. The record should make clear why the device is under consideration, rather than merely listing its resolution and marketing description.
Ask the system owner to identify any additional evaluation needed for the measurement target. The intended sensing location, assembly configuration and operating environment can be review inputs without this article prescribing a layout or calibration method. Retain the scope of that decision separately from the semiconductor ordering code.
After engineering selects the permitted device, keep its accepted accuracy basis with the controlled BOM or linked review record. A change in variant or intended conditions should trigger review of that basis. Proposed replacements remain identifiable until the responsible owner accepts them for the stated requirement.
For an ICULTRA temperature-sensor enquiry, provide the permitted code, quantity and relevant requirement reference. Identify candidates whose accuracy conditions are still unresolved. Ask each offer to name its exact variant. A technical specification supports the selection conversation; current supply terms and any required system evaluation are confirmed through their respective processes.
Sources and further reading
TI's TMP117 Rev.D accuracy and resolution fields supply the example. This checklist defines a comparison record; it provides no calibration, metrology certification or measured board result.