STUSB4500QTR

USB-PD sink controller, negotiates the 15V PD contract — ST (STMicroelectronics) — C2678061 — board-a U1 (fitted); board-p U1 (fitted) — rec-stusb4500qtr

Generated from the component evidence records — edit the records, not this page.

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: STUSB4500QTR

Identity

Fit: Fitted

Identity state: VERIFIED

Source state: AVAILABLE

Coverage: 7 open of 7 published

Documents and package

Datasheet PDF

STUSB4500 standalone USB PD sink controller with short-to-VBUS protections

Authority

MANUFACTURER_MIRROR

Availability

AVAILABLE

Footprint preview

Package 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.

Datasheet PDF — STUSB4500 standalone USB PD sink controller with short-to-VBUS protections

Selected source ID: src-stusb-ds12499

Authority: MANUFACTURER_MIRROR

Availability: AVAILABLE

Package footprint: QFN-24_L4.0-W4.0-P0.50-BL-EP2.8

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.

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.

identity/package/pinout

Coverage ID: cov-stusb-identity · Status: OPEN

Reason: Exact DS12499 Rev 8 bytes are reproducibly retained from a manufacturer-document mirror, but primary-only trust and project symbol/footprint/as-built evidence remain open for fact-stusb-manufacturer, fact-stusb-order-code, and fact-stusb-pin-states; dated 2026-08-02 and 2026-08-14 direct st.com retrievals (fact-stusb-ds12499-primary-attempt) found the primary source unavailable, so all remain UNSOURCED

Facts in this domain:

• fact-stusb-manufacturer

• fact-stusb-order-code

• fact-stusb-pin-states

• fact-stusb-ds12499-primary-attempt

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-manufacturer

• fact-stusb-order-code

• fact-stusb-pin-states

• fact-stusb-ds12499-primary-attempt

unpowered/reset/startup/normal/fault/disconnect behavior

Coverage ID: cov-stusb-states · Status: OPEN

Reason: Exact DS12499 Rev 8 and UM2650 Rev 3 bytes are reproducibly retained from mirrors; primary-only trust in these mirror bytes has not been established, and state behavior still requires programmed/as-built bench confirmation for fact-stusb-ccdb, fact-stusb-disch, fact-stusb-vbus-vs-disch, fact-stusb-vben, fact-stusb-load-time, fact-stusb-state-sequence, fact-stusb-nvm-load, fact-stusb-volatile-pdo, fact-stusb-discharge-registers, and fact-stusb-fault-status; dated 2026-08-02 and 2026-08-14 direct st.com retrievals (fact-stusb-ds12499-primary-attempt, fact-stusb-um2650-primary-attempt) found both primary sources unavailable, so all remain UNSOURCED

Facts in this domain:

• fact-stusb-ccdb

• fact-stusb-disch

• fact-stusb-vbus-vs-disch

• fact-stusb-vben

• fact-stusb-load-time

• fact-stusb-state-sequence

• fact-stusb-nvm-load

• fact-stusb-volatile-pdo

• fact-stusb-discharge-registers

• fact-stusb-fault-status

• fact-stusb-ds12499-primary-attempt

• fact-stusb-um2650-primary-attempt

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-ccdb

• fact-stusb-disch

• fact-stusb-vbus-vs-disch

• fact-stusb-vben

• fact-stusb-load-time

• fact-stusb-state-sequence

• fact-stusb-nvm-load

• fact-stusb-volatile-pdo

• fact-stusb-discharge-registers

• fact-stusb-fault-status

• fact-stusb-ds12499-primary-attempt

• fact-stusb-um2650-primary-attempt

project NVM image and factory-state capture

Coverage ID: cov-stusb-nvm · Status: OPEN

Reason: No as-built 40-byte dump or project-normalized image has been supplied for fact-stusb-artifact; the 15V NVM image written for the 0.4.0 order predates this bundle and was never retained as a normalized artifact

Facts in this domain:

• fact-stusb-artifact

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-artifact

NVM write endurance and production write budget

Coverage ID: cov-stusb-endurance · Status: OPEN

Reason: No manufacturer-primary endurance row is present in the retained reviewed extracts for fact-stusb-endurance

Facts in this domain:

• fact-stusb-endurance

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-endurance

safe power/provisioning/bench discriminators

Coverage ID: cov-stusb-bringup · Status: OPEN

Reason: Operating/state mirror bytes are available, but primary-only trust for fact-stusb-supplies, fact-stusb-vdd-absolute-max, fact-stusb-cc-absolute-max, and fact-stusb-vbus-pin-absolute-max, plus project NVM/readback/power-cycle evidence and bench waveforms, remain open; dated 2026-08-02 and 2026-08-14 direct st.com retrievals (fact-stusb-ds12499-primary-attempt, fact-stusb-um2650-primary-attempt) found both primary sources unavailable, so all remain UNSOURCED

Facts in this domain:

• fact-stusb-supplies

• fact-stusb-vdd-absolute-max

• fact-stusb-cc-absolute-max

• fact-stusb-vbus-pin-absolute-max

• fact-stusb-ds12499-primary-attempt

• fact-stusb-um2650-primary-attempt

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-supplies

• fact-stusb-vdd-absolute-max

• fact-stusb-cc-absolute-max

• fact-stusb-vbus-pin-absolute-max

• fact-stusb-ds12499-primary-attempt

• fact-stusb-um2650-primary-attempt

VREG_2V7 external DC loading and NVM-jig voltage matching

Coverage ID: cov-stusb-vreg2v7-load · Status: OPEN

Reason: Pin 23 (VREG_2V7) is documented decoupling-only in DS12499, yet board-a loads it with R15/R16 4.7k I2C pull-ups and exposes it on debug pogo pad J3.3 (net U1.23 C30.2 R15.2 R16.2 J3.3, fact-stusb-vreg2v7-load); closure requires a manufacturer-primary locator authorizing this external DC load (or a re-route decision) plus confirmation that the NVM-programming jig's logic levels match 2.7 V before any Board A NVM-programming bench work begins

Facts in this domain:

• fact-stusb-vreg2v7-load

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-vreg2v7-load

board-a netlist and as-built connectivity

Coverage ID: cov-stusb-board-a-netlist · Status: OPEN

Reason: Board A's topology is locked on paper (baseline snapshot plus the #90 fix list) but no Board A KiCad project, ERC pass, or as-built board exists yet, and the root cause of the v4 negotiation failure is still awaiting bench confirmation on the dead 0.4.0 boards; fact-stusb-pin18-path, fact-stusb-cc-termination, fact-stusb-gate-network and fact-stusb-interface-flags therefore stay NEEDS BENCH

Facts in this domain:

• fact-stusb-pin18-path

• fact-stusb-cc-termination

• fact-stusb-gate-network

• fact-stusb-interface-flags

Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.

• fact-stusb-pin18-path

• fact-stusb-cc-termination

• fact-stusb-gate-network

• fact-stusb-interface-flags

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.

RECOMMENDED_OPERATION

The range the manufacturer intends the part to be used in. Always narrower than the absolute maximum.

GUARANTEED_ELECTRICAL

A parameter the manufacturer guarantees over the stated conditions, usually with minimum, typical and maximum values.

TRANSIENT

Behaviour during a short event — startup, a switching edge, a fault or a surge.

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.

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-stusb4500qtr

• Symbol: STUSB4500QTR

• Footprint: QFN-24_L4.0-W4.0-P0.50-BL-EP2.8

• Pins: 25

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-stusb-netlist

• Records involved: rec-stusb4500qtr (this record)

• Conditions: Assert the zudo-pd board-a baseline nets exactly: U1.24 (VDD) sits directly on VBUS_IN with C1/C2 decoupling; U1.18 reaches VBUS_IN only through R14 470R with TP6 on the node; U1.9 (DISCH) reaches VBUS_OUT only through R13 470R; U1.16 (VBEN) drives the Q1 gate network (R12 56k series, R11 100k pull-up to VBUS_IN, C35 100n soft-start); U1.1/U1.5 bridge through fitted 0R R19/R20 to CC1/CC2 while R17/R18 external Rd and D6/D7 CC clamps stay DNP; U1.11 (ATT) lands on J3.6 and J4.3 and U1.20 (PDOK) on J3.7 and J4.4 with no on-board pull-ups; U1.6 (RESET), U1.10, U1.12/U1.13 (ADDR, I2C 0x28), U1.22 (VSYS) and U1.25 (EP) are grounded; U1.3 NC and U1.14/U1.15/U1.17/U1.19 float; U1.23 (VREG_2V7) also feeds the R15/R16 I2C pull-ups and pogo pad J3.3, an external DC load beyond decoupling that DS12499 does not yet authorize

• Verdict: UNSOURCED

Facts this rests on:

• fact-stusb-pin-states

• fact-stusb-ccdb

• fact-stusb-disch

• fact-stusb-vbus-vs-disch

• fact-stusb-vben

• fact-stusb-vreg2v7-load

• fact-stusb-pin18-path

• fact-stusb-cc-termination

• fact-stusb-gate-network

• fact-stusb-interface-flags

int-stusb-safe-power

• Records involved: rec-stusb4500qtr (this record)

• Conditions: First power with the J4 load disconnected and a current-limited source on VBUS_IN; board-a grounds VSYS, so supply is VDD-only within the documented 4.1..22 V range; use a common-ground I2C programmer on the J2 pogo interface, wait beyond TLOAD, and confirm the Q1 gate stays deasserted while detached before attaching a compliant PD source

• Verdict: NEEDS BENCH

Facts this rests on:

• fact-stusb-supplies

• fact-stusb-load-time

• fact-stusb-vben

int-stusb-nvm-verification

• Records involved: rec-stusb4500qtr (this record)

• Conditions: Capture factory 40 bytes; diff intended normalized 40-byte image; write once within verified endurance; read all 40 bytes; reset and read; remove all power long enough for rails to collapse and read again; decode PDO/polarity/discharge fields and negotiate each intended profile

• Verdict: NEEDS BENCH

Facts this rests on:

• fact-stusb-nvm-load

• fact-stusb-volatile-pdo

• fact-stusb-artifact

• fact-stusb-endurance

int-stusb-state-bench

• Records involved: rec-stusb4500qtr (this record)

• Conditions: Observe unpowered Rd, reset Hi-Z, startup load, attach/negotiation, SNK_READY, detach, hard reset, lower-PDO transition, forced fault, VBUS discharge, and VBUS_EN_SNK plus ATT/PDOK polarity with scope and register snapshots, probing through the J3 debug pads and TP1/TP2/TP6

• Verdict: NEEDS BENCH

Facts this rests on:

• fact-stusb-state-sequence

• fact-stusb-discharge-registers

• fact-stusb-fault-status

• fact-stusb-vben

int-stusb-cc-termination

• Records involved: rec-stusb4500qtr (this record)

• Conditions: R19/R20 0R bridges implement ST's dead-battery sink topology (CC1DB to CC1, CC2DB to CC2) on board-a; R17/R18 5.1k external Rd stay DNP because fitting them parallels the always-on internal Rd to about 2.55k effective and leaves the Type-C sink window (the v4 blocker); D6/D7 PESD24VS1UB CC clamps stay DNP for bring-up builds (when fitted, cathode faces CC and anode GND; their component evidence lives in the component-pesd24vs1ub-c85382 owner); re-audit the termination before fitting any DNP CC part

• Verdict: NEEDS BENCH

Facts this rests on:

• fact-stusb-ccdb

• fact-stusb-cc-termination

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: NEEDS BENCH — 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-tvs-clamp-vs-absmax — tvs-clamp-vs-absmax — rule verdict: UNSOURCED

• rule-q1-gate-drive-vs-contract — q1-gate-drive-vs-contract — rule verdict: NEEDS BENCH

• rule-inverting-startup-vs-pd-source — inverting-startup-vs-pd-source — rule verdict: NEEDS BENCH

• rule-evidence-chain — source-to-bench-chain — rule verdict: UNSOURCED — How far each claim has travelled from a manufacturer document towards a measurement on real hardware, stage by stage.

All cross-component rules

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.

STUSB4500 standalone USB PD sink controller with short-to-VBUS protections

Source ID: src-stusb-ds12499 · Authority: MANUFACTURER_MIRROR

Locator: Section 2, Table 1, QFN pin-function rows; Sections 2.2.1 through 2.2.16

Availability: AVAILABLE

Document URL: https://web.archive.org/web/20231016233405id\_/http://www.st.com/resource/en/datasheet/stusb4500.pdf

STUSB4500 standalone USB PD sink controller with short-to-VBUS protections

Source ID: src-stusb-ds12499-ratings · Authority: MANUFACTURER_MIRROR

Locator: Section 7.1, Table 20, absolute maximum rating rows VDD, CC/CCDB and high-voltage VBUS pins

Availability: AVAILABLE

Document URL: https://web.archive.org/web/20231016233405id\_/http://www.st.com/resource/en/datasheet/stusb4500.pdf

The STUSB4500 software programming guide

Source ID: src-stusb-um2650 · Authority: MANUFACTURER_MIRROR

Locator: Sections 3.22 through 3.25, register tables 0x25 through 0x29; Sections 3.60 through 3.72

Availability: AVAILABLE

Document URL: https://web.archive.org/web/20231016233356id\_/http://www.st.com/resource/en/user\_manual/um2650-the-stusb4500-software-programing-guide-stmicroelectronics.pdf

Getting started with the STEVAL-ISC005V1 evaluation board for STUSB4500

Source ID: src-stusb-um2398 · Authority: REFERENCE_DESIGN

Locator: Section 1.1, board overview and PDO list; schematic figures

Availability: SOURCE UNAVAILABLE

Document URL: https://www.st.com/resource/en/user\_manual/um2398-getting-started-with-the-stevalisc005v1-evaluation-board-for-stusb4500-stmicroelectronics.pdf

STSW-STUSB004 NVM customization tool

Source ID: src-stusb-stsw004 · Authority: MANUFACTURER_PRIMARY

Locator: Cover Description section, lines describing STUSB-NVM.h export and automatic NVM load

Availability: SOURCE UNAVAILABLE

Document URL: https://www.st.com/resource/en/data\_brief/stsw-stusb004.pdf

STUSB4500 standalone USB PD sink controller with short-to-VBUS protections

Source ID: src-stusb-ds12499-primary-attempt · Authority: MANUFACTURER_PRIMARY

Locator: Cover title block and Section 7.1 Table 20 rows; direct st.com retrieval attempted for primary-only trust recovery per zudo-pd issue #107

Availability: SOURCE UNAVAILABLE

Document URL: https://www.st.com/resource/en/datasheet/stusb4500.pdf

The STUSB4500 software programming guide

Source ID: src-stusb-um2650-primary-attempt · Authority: MANUFACTURER_PRIMARY

Locator: Cover title block and Sections 3.22-3.26 register tables; direct st.com retrieval attempted for primary-only trust recovery per zudo-pd issue #107

Availability: SOURCE UNAVAILABLE

Document URL: https://www.st.com/resource/en/user\_manual/um2650-the-stusb4500-software-programing-guide-stmicroelectronics.pdf

Board A baseline net-connectivity snapshot

Source ID: src-stusb-board-a-baseline · Authority: PROJECT_GENERATOR

Locator: nets rows VBUS_IN, CC1, CC2, CC1DB, CC2DB, VBUS_VS_DISCH, VBEN, Net-(Q1-G), VBUS_OUT, Net-(U1-DISCH), VREG_2V7, SCL-pin1, SDA-pin2, ATT, PDOK and GND

Availability: AVAILABLE

Document URL: https://raw.githubusercontent.com/Takazudo/zudo-pd/c89c1541fbd6315c9d41fd4f55737368ebcb7bbf/scripts/schgen/baselines/board-a.json

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

Provenance

Fact class

Coverage status

Source availability

Source authority

Identity state

Source state

Unit

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.

No owning bundle is identified in the published model.