FNR4030S4R7MT

4.7 uH logic buck inductor — Changjiang Microelectronics Tech (cjiang) — C167874 — board-l L2 — rec-fnr4030s4r7mt

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: FNR4030S4R7MT

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-ap63203wu-7, 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-fnr4030s4r7mt

• Record kind: subordinate

• Manufacturer part number: FNR4030S4R7MT

• Manufacturer: Changjiang Microelectronics Tech (cjiang)

• Function: 4.7 uH logic buck inductor

• LCSC ID: C167874

• Package: IND-SMD_L4.0-W4.0_FNR40XXS

• Inventory line: line-c167874

• Also known as: AP63203 inductor

• Owner skill: component-ap63203wu-7

• Fit: Fitted

• Identity state: UNRESOLVED

• Source state: SOURCE UNAVAILABLE

• Coverage: 1 open of 2 published

Component references

Selected document

Specification PDF

Wire Wound SMD Power Inductors - FNR Series

Authority

MANUFACTURER_MIRROR

Availability

AVAILABLE

Footprint preview

Footprint preview for IND-SMD_L4.0-W4.0_FNR40XXS

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.

Interactive 3D view of shared footprint package IND-SMD_L4.0-W4.0_FNR40XXS

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.

inductance-dcr-srf-current-package

• Coverage ID: cov-fnr-spec

• Status: COVERED

Reason: A direct cjiang.com.cn primary-retrieval attempt on 2026-08-02 (src-fnr-series-official) exactly matched every electrical parameter in fact-fnr-inductance through fact-fnr-package against the manufacturer's own FNR4030S series table (inductance, tolerance, DCR max, SRF min, Isat max, Irms max, temperature, package all confirmed). fact-fnr-rating-definitions stays NEEDS BENCH/mirror-sourced only because the *3/*4 footnote text was not located on the pages checked, not because any value is unconfirmed.

Facts in this domain:

• fact-fnr-inductance

• fact-fnr-tolerance

• fact-fnr-inductance-min

• fact-fnr-dcr-max

• fact-fnr-srf-min

• fact-fnr-isat-max

• fact-fnr-irated-max

• fact-fnr-rating-definitions

• fact-fnr-temperature

• fact-fnr-package

project-load-and-temperature

• Coverage ID: cov-fnr-project

• Status: OPEN

Reason: The exact mirror shows the 2.0 A heating criterion below the 2.7 A full-load recommendation; actual load/ripple/temperature require analysis and bench verification.

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.

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.

THERMAL_SOA

Thermal and safe-operating-area behaviour: how much the part may dissipate, and under what mounting and ambient conditions.

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.

Calculation dependencies

These values were derived from other recorded facts rather than read from a document. The expression and every input are published so the number can be recomputed instead of trusted. A derived value is never stronger than the weakest fact it depends on.

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-fnr4030

• Symbol: FNR4030S4R7MT

• Footprint: IND-SMD_L4.0-W4.0_FNR40XXS

• Pins: 2

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-ap63203-power-stage

• Records involved: rec-ap63203wu-7, rec-fnr4030s4r7mt (this record), rec-cl21a226maqnnne

• Conditions: full input/load/temperature envelope and PCB layout; nominal capacitance cannot establish guaranteed stability

• Verdict: NEEDS BENCH

Facts this rests on:

• fact-ap63203-required-inductor-current on AP63203WU-7

• fact-ap63203-reference-l on AP63203WU-7

• fact-ap63203-reference-cap on AP63203WU-7

• fact-fnr-isat-margin

• fact-fnr-irated-margin

• fact-cl21-effective-capacitance-status on CL21A226MAQNNNE

int-fnr-filter

• Records involved: rec-fnr4030s4r7mt (this record)

• Conditions: actual V3P3 load, ripple, ambient, and airflow

• Verdict: NEEDS BENCH

Facts this rests on:

• fact-fnr-inductance-min

• fact-fnr-dcr-max

• fact-fnr-isat-margin

• fact-fnr-irated-margin

• fact-fnr-project-nets

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-ap63203-logic-stage — ap63203-logic-stage — rule verdict: UNSOURCED — How the logic-rail converter, its inductor and its output capacitor behave together under the real load the microcontroller presents.

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.

Wire Wound SMD Power Inductors - FNR Series

• Source ID: src-fnr-series-mirror

• Document number: FNR Series

• Revision: not stated

• Document date: not stated

• Retrieved: 2026-08-02

• Authority: MANUFACTURER_MIRROR

• Locator: Specifications table row FNR4030S4R7MT and footnote rows 1-4 on physical page 19

• Printed page: unprinted physical page 19

• Availability: AVAILABLE

• Document URL: https://datasheet.lcsc.com/datasheet/pdf/a0b12ba9dfe6b9e66b6bb852b7c71c03.pdf?productCode=C167874

Board L generated schematic specification

• Source ID: src-fnr-generator

• Document number: scripts/schgen/board_l_spec.py

• Revision: 410bc1a342286dd6c205d6dcec0f248b8a963987

• Document date: 2026-08-02

• Retrieved: 2026-08-02

• Authority: PROJECT_GENERATOR

• Locator: COMPONENTS table row L2 and NETS rows SW_LOGIC and V3P3

• Printed page: source file

• Availability: AVAILABLE

• Document URL: https://raw.githubusercontent.com/Takazudo/zudo-led-lamp/410bc1a342286dd6c205d6dcec0f248b8a963987/scripts/schgen/board\_l\_spec.py

Wire Wound SMD Power Inductors - FNR Series

• Source ID: src-fnr-series-official

• Document number: not stated

• Revision: not stated

• Document date: not stated

• Retrieved: 2026-08-02

• Authority: MANUFACTURER_PRIMARY

• Locator: Page 1 title/operating-temperature statement and Product Identification decode table; page 2 FNR4030S dimensions row; FNR4030S Series specifications table row FNR4030S4R7MT

• Printed page: 10

• Availability: AVAILABLE

• Document URL: http://www.cjiang.com.cn/Pr\_download\_id\_1205.html

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.

Open the owning bundle component-ap63203wu-7