DS254P-2X10-L0

ST-LINK/V2 20-pin adapter header — DEALON — C4749199 — swd-adapter J1 — rec-c4749199

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: DS254P-2X10-L0

Subordinate record

This is a subordinate record. It is a component in its own right, with its own orderable identity and its own placements, but its evidence is audited as part of rec-c529334, because its behaviour is only meaningful in that part's circuit. Read the parent record for the shared context; the facts below are the ones specific to this line.

Identity

Record ID: rec-c4749199
Record kind: subordinate
Manufacturer part number: DS254P-2X10-L0
Manufacturer: DEALON
Function: ST-LINK/V2 20-pin adapter header
LCSC ID: C4749199
Package: IDC-TH_20P-P2.54-V-R2-C10-S2.54
Inventory line: line-c4749199
Also known as: 2x10 shrouded IDC header
Owner skill: component-stm32g031f8p6
Fit: DNP or hand-fit
Identity state: VERIFIED
Source state: AVAILABLE
Coverage: 2 open of 3 published

Component references

Selected document

Mechanical drawing PDF

DEALON DS254P-2X series L0 product drawing

Authority: MANUFACTURER_PRIMARY
Availability: AVAILABLE

Footprint preview

Package model

Shared footprint package: IDC-TH_20P-P2.54-V-R2-C10-S2.54

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
swd-adapter	`J1`

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-mechanical-and-electrical-drawing

Coverage ID: cov-c4749199-spec
Status: COVERED

Reason: fact-c4749199-identity binds the exact distributor orderable line; fact-c4749199-mechanical and fact-c4749199-rating are locked to the available DEALON drawing

Facts in this domain:

fact-c4749199-manufacturer
fact-c4749199-identity
fact-c4749199-mechanical
fact-c4749199-rating

stlink-v2-interface-source-lock

Coverage ID: cov-c4749199-stlink
Status: OPEN

Reason: fact-c4749199-stlink-mapping retains exact UM1075 locators but remains UNSOURCED because official PDF bytes could not be retained; the project topology is explicit but does not promote that unavailable source to PASS

Facts in this domain:

fact-c4749199-stlink-mapping
fact-c4749199-topology

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

fact-c4749199-stlink-mapping

physical-fit-continuity-and-debug-state

Coverage ID: cov-c4749199-bench
Status: OPEN

Reason: fact-c4749199-bench remains NEEDS BENCH until a fabricated adapter is inspected and exercised

Facts in this domain:

fact-c4749199-bench

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

fact-c4749199-bench

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.

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-c4749199-rating`	3 A maximum per contact, contact resistance 20 milliohm maximum, insulation resistance 1000 megohm minimum at 100 V, dielectric withstand 550 VAC for one minute	`NONE`	DEALON DS254P-2X□-L0 technical-data table; dielectric withstand is not a working-voltage rating	PASS - primary-source confirmed	PRIMARY-SPEC	src-c4749199-drawing: TECHNICAL DATA table

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-c4749199-manufacturer`	DEALON	`NONE`	DS254P-2X□-L0 family identity; exact DS254P-2X10-L0 orderable identity is separately distributor-confirmed	PASS - primary-source confirmed	PRIMARY-SPEC	src-c4749199-drawing: DEALON title block and ordering-code row
`fact-c4749199-identity`	`lcsc`=C4749199; `manufacturer`=DEALON; `mpn`=DS254P-2X10-L0; `variant`=2x10, 2.54 mm, vertical through-hole, shrouded, L0	`NONE`	dated distributor identity only; stock and availability must be rechecked at order time	CONFIRMED - distributor identity only	DISTRIBUTOR-IDENTITY	src-c4749199-lcsc: JSON-LD product identity row fields sku, mpn and brand
`fact-c4749199-mechanical`	20 positions in two rows at 2.54 mm pitch and row spacing; 33.02 mm body length, 9.0 mm body width, 22.86 mm end-pin span, 1.02 mm PCB holes, 0.64 mm square pins, 3.0 mm tails; odd pins and pin 1 are on the notched/triangle side	`NONE`	DS254P-2X□-L0 family drawing, 20P dimensional row and top-view PCB layout	PASS - primary-source confirmed	PRIMARY-SPEC	src-c4749199-drawing: outline, PCB layout and 20P row
`fact-c4749199-stlink-mapping`	Genuine ST-LINK/V2 CN3 SWD: 1/2 VAPP target sense, 3/5 GND for ribbon-noise reduction, 4/6/8/10/12/14/16/18/20 GND, 7 SWDIO, 9 SWCLK, 11/17 NC, 13 optional SWO, 15 NRST, 19 debugger 3.3 V output and NC in SWD target connection	`NONE`	ST-LINK/V2, not ST-LINK/V2-ISOL; Table 4 SWD column; official PDF bytes are not retained in the frozen bundle	UNSOURCED	UNVERIFIED	src-c4749199-um1075: section 4.2, Table 4 and Figure 10
`fact-c4749199-topology`	Adapter J1: 7 SWDIO to J2.1, 9 SWCLK to J2.2, 15 NRST to J2.3, 1/2 VAPP to J2.4, 3/4/5/6/8/10/12/14/16/18/20 GND to J2.5; J1.11/.13/.17/.19 are no-connects; exactly J1 and J2 are DNP	`NONE`	generated swd-adapter schematic specification; a straight pin-for-pin 1x5 cable connects J2 to Board L J3	NOT APPLICABLE	PROJECT-CHOICE	src-c4749199-generator: source table sections COMPONENTS, NETS and NO_CONNECT
`fact-c4749199-bench`	physical ribbon mating, connector orientation, all signal continuity, J1.19 isolation, VAPP-to-GND resistance, target-voltage sensing and a live ST-LINK debug/programming session	`NONE`	post-fabrication acceptance artifact; no fabricated adapter exists yet	NEEDS BENCH	PROJECT-CHOICE	src-c4749199-generator: topology table and explicit J1 pin 19 no-connect row

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-c4749199

Symbol: DS254P-2X10-L0
Footprint: IDC-TH_20P-P2.54-V-R2-C10-S2.54
Pins: 20

Pin assignments

Symbol pin	Name	Footprint pad	Function
`1`	`VAPP`	`1`	VAPP target-voltage sense to J2.4
`2`	`VAPP`	`2`	VAPP target-voltage sense to J2.4
`3`	`TRST`	`3`	GND for SWD ribbon noise reduction
`4`	`GND`	`4`	GND
`5`	`TDI`	`5`	GND for SWD ribbon noise reduction
`6`	`GND`	`6`	GND
`7`	`TMS_SWDIO`	`7`	SWDIO to J2.1
`8`	`GND`	`8`	GND
`9`	`TCK_SWCLK`	`9`	SWCLK to J2.2
`10`	`GND`	`10`	GND
`11`	`NC`	`11`	no connect
`12`	`GND`	`12`	GND
`13`	`TDO_SWO`	`13`	optional SWO intentionally no connect
`14`	`GND`	`14`	GND
`15`	`NRST`	`15`	NRST to J2.3
`16`	`GND`	`16`	GND
`17`	`NC`	`17`	no connect
`18`	`GND`	`18`	GND
`19`	`VDD_3V3_OUT`	`19`	debugger 3.3 V output intentionally no connect
`20`	`GND`	`20`	GND

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-c492404-programming

Records involved: rec-c529334, rec-c492404, rec-c4749199 (this record)
Conditions: Board L J3 and adapter J1/J2 are DNP; use a straight pin-for-pin 1x5 cable, power the target, align both pin-1 marks and the 20-pin shroud key, keep J1.19 isolated, and verify fitment, continuity, target sense and debugger behavior before use
Verdict: NEEDS BENCH

Facts this rests on:

fact-c492404-topology on PZ254V-11-05P
fact-c4749199-stlink-mapping
fact-c4749199-topology
fact-c4749199-bench
fact-c529334-reset on STM32G031F8P6
fact-c529334-boot on STM32G031F8P6
fact-c529334-debug on STM32G031F8P6

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.

No cross-component rule names this record.

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.

LCSC C4749199 product record

Source ID: src-c4749199-lcsc
Document number: C4749199
Revision: server-rendered product page
Document date: 2026-08-23
Retrieved: 2026-08-23
Authority: DISTRIBUTOR_IDENTITY
Locator: Server-rendered JSON-LD product identity row fields sku, mpn, brand and inventoryLevel
Printed page: web page
Availability: AVAILABLE
Document URL: https://www.lcsc.com/product-detail/C4749199.html

DEALON DS254P-2X series L0 product drawing

Source ID: src-c4749199-drawing
Document number: DS254P-2X□-L0
Revision: family drawing
Document date: not stated
Retrieved: 2026-08-23
Authority: MANUFACTURER_PRIMARY
Locator: 20P dimensional row, PCB layout, ordering code, material and technical-data tables
Printed page: 1
Availability: AVAILABLE
Document URL: https://datasheet.lcsc.com/datasheet/pdf/12c51383c39fcead6f26da1b11a5fd7f.pdf?productCode=C4749199

ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 user manual

Source ID: src-c4749199-um1075
Document number: UM1075
Revision: Rev 10
Document date: 2024-04-03
Retrieved: 2026-08-23
Authority: MANUFACTURER_PRIMARY
Locator: Section 4.2, Table 4 JTAG/SWD cable connections on STLINK-V2; Figure 10 top-view numbering
Printed page: 12
Availability: SOURCE UNAVAILABLE
Document URL: https://www.st.com/resource/en/user\_manual/um1075-stlink-v2-in-circuit-debugger-stlink-v2-1-stlink-v2-ct-stlink-v3-pg00061083.pdf

SWD adapter generated schematic specification

Source ID: src-c4749199-generator
Document number: swd-adapter-spec
Revision: 203e19d390b70a65083cb0c1ab3c7ee4b718721d
Document date: 2026-08-23
Retrieved: 2026-08-23
Authority: PROJECT_GENERATOR
Locator: COMPONENTS, NETS and NO_CONNECT tables
Printed page: source
Availability: AVAILABLE
Document URL: https://raw.githubusercontent.com/Takazudo/zudo-led-lamp/203e19d390b70a65083cb0c1ab3c7ee4b718721d/scripts/schgen/swd\_adapter\_spec.py

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
`CONFIRMED - distributor identity only`	A distributor listing confirms which part this is, and nothing more. It carries no electrical, thermal or lifetime authority.
`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.
`UNSOURCED`	No accepted source backs this value yet. Treat it as a claim, not a fact.

Provenance

Recorded term	What it means
`DISTRIBUTOR-IDENTITY`	Taken from a distributor listing. Identity information only.
`PRIMARY-SPEC`	Taken from the manufacturer's own specification document.
`PROJECT-CHOICE`	A decision made by this project. No vendor asserts it.
`UNVERIFIED`	Recorded, but not yet backed by an accepted source.

Fact class

Recorded term	What it means
`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.

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 UNAVAILABLE`	The document could not be retrieved. It stays listed so the gap is visible; anything resting on it remains unsourced.

Source authority

Recorded term	What it means
`DISTRIBUTOR_IDENTITY`	A distributor listing. Establishes which part this is, nothing more.
`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
`VERIFIED`	The exact orderable part has been confirmed against a source.

Source state

Recorded term	What it means
`AVAILABLE`	At least one document backing this line was 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-stm32g031f8p6