Part Data Review and Validation

1:23

Cross-checking project files.

Clarifying property updates.

Simplifying data access.

Analyzing the schematic.

Analyzing the PCB layout.

Looking for "SM712-02HTG manufacturer, exact MPN, package, pin count, and product description." in media?resourcetype=datasheets&itemid=a4019802-ff62-41ff-bf66-295f97422f81&filename=littelfuse-tvs-diode-array-sm712-datasheet

Looking for "Electrical characteristics and key specs for SM712 or SM712-02HTG: reverse standoff voltage, breakdown voltage, clamp voltage, peak pulse current, package, operating temperature." in media?resourcetype=datasheets&itemid=a4019802-ff62-41ff-bf66-295f97422f81&filename=littelfuse-tvs-diode-array-sm712-datasheet

Looking for "Pin configuration, pin names, pin descriptions, and package outline for the SOT-23-3 package used by SM712-02HTG." in media?resourcetype=datasheets&itemid=a4019802-ff62-41ff-bf66-295f97422f81&filename=littelfuse-tvs-diode-array-sm712-datasheet

Looking for "Does the datasheet describe this part as a TVS diode array for RS-485/RS-422 with one protected line pair? Provide the key application description." in media?resourcetype=datasheets&itemid=a4019802-ff62-41ff-bf66-295f97422f81&filename=littelfuse-tvs-diode-array-sm712-datasheet

I reviewed the part project against the available data and the datasheet-sync criteria. The project already has a Datasheet URL, so no web lookup was needed. For part-project verification, the main checks are: exact pin count match, exact pin-number match, datasheet as source of truth, and flagging any missing or ambiguous pin metadata

Summary

Category	Status	Notes
MPN	OK	Project has SM712-02HTG; datasheet result matches exactly.
Manufacturer	OK	Project has Littelfuse; datasheet result matches.
Datasheet URL	OK	Already present, so no update was required.
Package	Mostly OK	Project says SOT-23; datasheet says SOT23-3 / JEDEC TO-236. Functionally consistent, but project metadata is less specific.
Pin count	OK	Datasheet says 3 pins; schematic has 3 terminal elements and layout has 3 pads.
Footprint	Looks consistent	Layout shows exactly 3 pads, consistent with SOT-23-3.
Schematic symbol	Incomplete metadata	Symbol has 3 terminals, but all `Pin Type` values are Unspecified and no pin descriptions are present.
Pin descriptions	Mismatch / missing	Datasheet-based pin behavior exists, but project terminals do not carry pin descriptions.
Project description	Needs cleanup	Current description is not aligned with the datasheet’s clearer product description/application wording.

Key specs from the datasheet

Spec	Value
Device type	Asymmetrical TVS diode array for RS-485 protection
Exact MPN	SM712-02HTG
Package	SOT23-3 / JEDEC TO-236
Pin count	3
Peak pulse power	600 W
Peak pulse current	19 A at 8/20 µs
Reverse standoff voltage	7.0 V from pin 3 to pin 1 or 2; 12.0 V from pin 1 or 2 to pin 3
Breakdown voltage	7.5 V / 13.3 V depending on direction
Clamp voltage	Up to 31 V at 19 A in one polarity; 19 V in the opposite polarity
Operating temperature	-40 °C to +125 °C

The datasheet-sync guidance says project metadata should use the exact MPN, manufacturer, package, and a clear functional description led by what the part does

Cross-check results Project properties

MPN: correct
Manufacturer Name: correct
Designator Prefix: D is appropriate for a diode device
Package or Case Code: acceptable but should ideally be SOT23-3 rather than the broader SOT-23
Part Type: currently Diodes, which is usable but not very specific; TVS Diode Array would better match the datasheet-sync guidance to use the functional category from the datasheet
Description: current text is somewhat inconsistent with the datasheet’s positioning. The datasheet describes the part as an RS-485 protection TVS diode array with asymmetrical working voltages, which is clearer than the current clamp-voltage-only phrasing.

Schematic symbol

The symbol contains exactly three terminal components:

What matches:

Pin numbers 1, 2, 3 are present
Terminal count matches the datasheet pin count exactly, which is a critical requirement

What is missing:

All three terminals have Pin Type: Unspecified
No Pin Description properties are present
No richer symbol metadata such as section/grouping, though for a 3-pin diode part that is less important than getting pin type and description right

Footprint

The layout contains:

a footprint container
exactly 3 pads, designators 1, 2, 3

That is consistent with the datasheet package being SOT23-3. So at a structural level, the footprint appears to match the package pin count.

Mismatches and flags

Issue	Severity	Detail
Package metadata not fully specific	Low	Project says `SOT-23`; datasheet is more specifically `SOT23-3 / TO-236`.
Part Type too generic	Low	`Diodes` is broad; datasheet indicates `TVS diode array`.
Project description not ideal	Medium	Current description focuses on clamp values but not the part’s core function.
Pin Type missing on all pins	Medium	All terminals are `Unspecified`, which reduces symbol quality/ERC usefulness.
Pin descriptions missing	Medium	No terminal descriptions are present, so the symbol is incomplete from a library-quality standpoint.
Pin-name/function cross-check incomplete	Medium	The retrieved datasheet text gave pin-number-based electrical behavior, but not explicit named terminal labels in a clean pin table extract, so I can only verify count and numbering, not exact terminal naming text.

Recommended cleanup

Property / Area	Recommended value
Part Type	`TVS Diode Array`
Package or Case Code	`SOT23-3`
Description	`RS-485 protection TVS diode array, asymmetrical -7 V to 12 V working range, 600 W, 19 A, SOT23-3`
Pin metadata	Add `Pin Type` and short `Pin Description` for pins 1, 2, 3

Bottom line

Good: MPN, manufacturer, datasheet presence, 3-pin symbol, and 3-pad footprint are all consistent.
Needs work: package specificity, part-type specificity, description quality, and especially terminal metadata.
No hard structural mismatch found between datasheet pin count and the current symbol/footprint.
Main mismatch is completeness, not geometry: the part is missing useful pin typing/description data expected for a polished part project

If you want, I can next help you generate the exact pin metadata to add for 1, 2, and 3.

Generate pin metadata

Tighten part metadata

List all mismatches

8 days

Ready.

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