AO3401A
P-channel load-switch MOSFET — UMW (Youtai Semiconductor) — C347476 — board-p Q1 — rec-umw-ao3401a
Everything below is projected from this project's stored component evidence. Values keep the exact wording, conditions, units and verdicts they were recorded with — nothing here is re-typed, corrected, or combined into an overall judgement about the part.
This record in the catalog: AO3401A
Identity
Record ID:
rec-umw-ao3401aRecord kind: standalone
Manufacturer part number:
AO3401AManufacturer: UMW (Youtai Semiconductor)
Function: P-channel load-switch MOSFET
LCSC ID:
C347476Package:
SOT-23_L2.9-W1.3-P1.90-LS2.4-BRInventory line:
line-c347476Also known as:
UMW,Youtai Semiconductor,Board P load switchOwner skill:
component-umw-ao3401a-c347476Fit: Fitted
Identity state: UNRESOLVED
Source state: SOURCE UNAVAILABLE
Coverage: 2 open of 4 published
Component references
Selected document
Datasheet PDF
Footprint preview
SOT-23_L2.9-W1.3-P1.90-LS2.4-BR. Open SVGPackage model
Interactive inspection requires JavaScript and WebGL. The package identity remains available in this page.
This geometry represents a shared footprint package and may not exactly match the manufacturer part.
Placements
Every position this exact line occupies in the as-built design. One line may be placed many times and across more than one board.
| Board | Reference designator |
|---|---|
| board-p | Q1 |
Coverage
Coverage is stated one domain at a time and is never rolled up. A domain marked open is a question that has not been answered; it is not a finding that the part is unsuitable. A record with no open domains has not thereby been declared safe.
exact vendor identity/package/pinout
Coverage ID:
cov-umw-identityStatus: COVERED
Reason: UMW document title and pin figure
Facts in this domain:
polarity/ratings/threshold/RDS(on)/body diode
Coverage ID:
cov-umw-electricalStatus: COVERED
Reason: UMW absolute maximum and electrical tables
Facts in this domain:
application SOA/thermal/inrush behavior
Coverage ID:
cov-umw-thermalStatus: OPEN
Reason: UMW thermal rows and SOA figures are available, but installed copper, inrush waveform, negotiated VBUS and temperature require bench evidence
Facts in this domain: none are recorded against it.
Blocked by: no blocking fact is recorded. What is missing has not been reduced to a specific recorded fact, so the reason above is the whole of what is known.
generated connectivity versus symbol/footprint/as-built confirmation
Coverage ID:
cov-umw-project-netlistStatus: OPEN
Reason: Immutable generator source records Q1 nets, but exported netlist, footprint mapping and assembled orientation must be independently checked
Facts in this domain: none are recorded against it.
Blocked by: no blocking fact is recorded. What is missing has not been reduced to a specific recorded fact, so the reason above is the whole of what is known.
Facts
Each fact keeps its value, its unit, the conditions it holds under, where it came from and how far it has been confirmed as separate fields, because they are separate claims. A value without its conditions is not the same fact, and a verdict is about the evidence for the value, not about the part.
ABSOLUTE_MAXIMUM
A never-exceed limit. Reaching it may damage the part; it is not an operating target and there is no margin implied by it.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-umw-ao3401a-vds | -30 | V | drain-source absolute maximum, Ta=25 degC | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 1 absolute maximum table row VDS |
fact-umw-ao3401a-vgs | 12 | V | magnitude of gate-source absolute maximum | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 1 absolute maximum table row VGS +/-12 V |
fact-umw-ao3401a-current | -4.2 A continuous at Ta=25 degC; -30 A pulsed | NONE | package/thermal test conditions; not a guaranteed Board P load capability | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 1 absolute maximum table rows ID and IDM |
GUARANTEED_ELECTRICAL
A parameter the manufacturer guarantees over the stated conditions, usually with minimum, typical and maximum values.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-umw-ao3401a-rdson | 50 mOhm max at VGS=-10 V ID=-4.2 A; 65 mOhm max at -4.5 V/-4 A; 120 mOhm max at -2.5 V/-1 A | NONE | Ta=25 degC electrical-characteristic test points | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 2 electrical table rows RDS(on) |
fact-umw-ao3401a-threshold | -0.4 to -1.3 | V | VDS=VGS, ID=-250 uA; onset only, not usable load drive | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 2 electrical table row VGS(th) |
fact-umw-ao3401a-body-diode | IS -2.2 A max; VSD -1 V max at IS=-1 A, VGS=0 | NONE | body-diode direction follows source-to-drain for P-channel symbol | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 2 electrical table body-diode rows |
THERMAL_SOA
Thermal and safe-operating-area behaviour: how much the part may dissipate, and under what mounting and ambient conditions.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-umw-ao3401a-thermal | RthetaJA 90 degC/W t<=10 s; 125 degC/W steady; RthetaJC 60 degC/W; TJ max 150 degC | NONE | datasheet mounting/test assumptions; Board P copper differs | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 1 absolute maximum/thermal rows |
fact-umw-ao3401a-soa | use Figure 9 pulse-width/DC boundaries and Figure 10 transient thermal impedance | NONE | single-pulse curves at stated ambient; verify actual inrush waveform | NEEDS BENCH | PRIMARY-SPEC | src-umw-ao3401a: Figures 9-10 maximum SOA and transient thermal response |
PROJECT_STATE
A value this project recorded about how the part is used here — a chosen operating point, a net assignment, or a derived figure. Not a manufacturer specification.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-umw-ao3401a-manufacturer | UMW (Youtai Semiconductor) | NONE | exact C347476 orderable; exclude AOS and other AO3401A vendors | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: document title block and logo |
fact-umw-ao3401a-pinout | 1 Gate, 2 Source, 3 Drain | NONE | SOT-23 top-view device pin figure | PASS - primary-source confirmed | PRIMARY-SPEC | src-umw-ao3401a: page 1 pin figure, pins 1-3 |
fact-umw-ao3401a-project-nets | Q1.1=Q1_G; Q1.2=VBUS_IN; Q1.3=VBUS_OUT | NONE | current Board P generated schematic source at immutable revision 410bc1a | NOT APPLICABLE | PROJECT-CHOICE | src-umw-ao3401a-board-p-generator: COMPONENTS row Q1 and NETS rows Q1_G, VBUS_IN and VBUS_OUT |
Pin maps
The mapping between schematic pins and PCB pads, or physical terminals for an external part, as recorded. A record may carry more than one map when the same part is documented in more than one context.
pinmap-umw-ao3401a
Symbol:
AO3401A_C347476Footprint:
SOT-23_L2.9-W1.3-P1.90-LS2.4-BRPins: 3
Pin assignments
| Symbol pin | Name | Footprint pad | Function |
|---|---|---|---|
1 | G | 1 | gate/Q1_G |
2 | S | 2 | source/VBUS_IN |
3 | D | 3 | drain/VBUS_OUT |
Interactions
Behaviour that is not a property of this part alone. Each interaction names the records it spans, the conditions it holds under, and how far it has been confirmed. An interaction that spans several parts appears on every one of their pages, under the same identifier, because it is equally a fact about each.
int-umw-ao3401a-netlist
Records involved:
rec-umw-ao3401a(this record)Conditions: Generator asserts Q1.1 gate=Q1_G, Q1.2 source=VBUS_IN, Q1.3 drain=VBUS_OUT; verify exported netlist, symbol/footprint mapping and as-built orientation. Reversed source/drain or gate-source excursion beyond +/-12 V is a deterministic blocker
Verdict: NEEDS BENCH
Facts this rests on:
int-umw-ao3401a-bench
Records involved:
rec-umw-ao3401a(this record)Conditions: Scope VGS, VDS, inrush and steady current from 5 V through highest negotiated VBUS; confirm off leakage/body-diode direction, load regulation, case temperature, and SOA margin with intended downstream load
Verdict: NEEDS BENCH
Facts this rests on:
Cross-component rules
Rules that span several parts at once and are published in full on the integration page. Each rule's verdict below is that rule's own — it is a statement about the cross-component question, not about this part — and the exact wording of what the rule refuses to conclude is published with the rule itself.
rule-rail-envelope— rail-envelope — rule verdict: UNSOURCED — Whether every part on the input rail stays inside its own recorded limits across a legal power contract, a mis-contract, and a transient clamp event.rule-usb-pd-nvm-load-switch— usb-pd-nvm-load-switch — rule verdict: UNSOURCED — How the power-delivery controller's stored configuration and its enable output drive the load switch, through every state from detached to fault.rule-evidence-chain— source-to-bench-chain — rule verdict: NEEDS BENCH — How far each claim has travelled from a manufacturer document towards a measurement on real hardware, stage by stage.
Sources
Every document cited above, with its identification, when it was retrieved, and what kind of authority it carries. Sources that could not be retrieved are listed too, with their unavailability stated, so a gap in the evidence is visible rather than absent.
UMW AO3401A P-Channel Enhancement MOSFET
Source ID:
src-umw-ao3401aDocument number: AO3401A
Revision: document retrieved 2026-08-02
Document date: undated
Retrieved: 2026-08-02
Authority: MANUFACTURER_PRIMARY
Locator: Page 1 pin figure and absolute maximum table; page 2 electrical-characteristics table; Figures 9-11 SOA/thermal
Printed page: 2
Availability: AVAILABLE
Document URL: https:
/ / www. umw- ic. com/ static/ pdf/ c9d58224f731ff9fc35c005d79a7a9bf. pdf
Board P generated schematic specification
Source ID:
src-umw-ao3401a-board-p-generatorDocument number: board-p-spec
Revision: 410bc1a342286dd6c205d6dcec0f248b8a963987
Document date: 2026-08-01
Retrieved: 2026-08-02
Authority: PROJECT_GENERATOR
Locator: COMPONENTS row Q1 and NETS rows Q1_G, VBUS_IN and VBUS_OUT
Printed page: source
Availability: AVAILABLE
Legend
What the recorded terms on this page mean, in ordinary words. The exact terms above are the ones that count; these descriptions explain them and never replace them.
Verdict
| Recorded term | What it means |
|---|---|
NEEDS BENCH | Cannot be settled from documents. It needs measurement on real hardware before it can be relied on. |
NOT APPLICABLE | The parameter does not apply to this part as it is used here. |
PASS - primary-source confirmed | Confirmed against the manufacturer's own document for this exact part. |
Provenance
| Recorded term | What it means |
|---|---|
PRIMARY-SPEC | Taken from the manufacturer's own specification document. |
PROJECT-CHOICE | A decision made by this project. No vendor asserts it. |
Fact class
| Recorded term | What it means |
|---|---|
ABSOLUTE_MAXIMUM | A never-exceed limit. Reaching it may damage the part; it is not an operating target and there is no margin implied by it. |
GUARANTEED_ELECTRICAL | A parameter the manufacturer guarantees over the stated conditions, usually with minimum, typical and maximum values. |
PROJECT_STATE | A value this project recorded about how the part is used here — a chosen operating point, a net assignment, or a derived figure. Not a manufacturer specification. |
THERMAL_SOA | Thermal and safe-operating-area behaviour: how much the part may dissipate, and under what mounting and ambient conditions. |
Coverage status
| Recorded term | What it means |
|---|---|
COVERED | Every question this domain asks is answered by the facts listed against it. |
OPEN | Unresolved. Open means the question has not been answered, not that the part is unsafe — the reason states what is missing. |
Source availability
| Recorded term | What it means |
|---|---|
AVAILABLE | The document was retrieved and is on record. |
Source authority
| Recorded term | What it means |
|---|---|
MANUFACTURER_PRIMARY | The manufacturer's own document for this exact part. |
PROJECT_GENERATOR | A document this project generated, such as a schematic or netlist export. |
Identity state
| Recorded term | What it means |
|---|---|
UNRESOLVED | The exact orderable part is not yet confirmed. Substituting a same-name part from another vendor is not permitted on that basis. |
Source state
| Recorded term | What it means |
|---|---|
SOURCE UNAVAILABLE | No document backing this line could be retrieved. |
Unit
| Recorded term | What it means |
|---|---|
NONE | The value is not a physical quantity, so it carries no unit. Recorded as `NONE`. |
Raw agent resource
This page is generated from a stored evidence bundle and does not restate it. The bundle is the source of truth: where the two ever disagree, the bundle is right and this page is stale.
Open the owning bundle component-umw-ao3401a-c347476