SMAJ16A
15V-only input surge TVS — Littelfuse — C74561 — board-p D5 (fitted) — rec-c74561
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: SMAJ16A
Identity
| Field | Recorded value |
|---|---|
| Record ID | rec-c74561 |
| Record kind | standalone |
| Manufacturer part number | SMAJ16A |
| Manufacturer | Littelfuse |
| Function | 15V-only input surge TVS |
| LCSC ID | C74561 |
| Package | SMA_Littelfuse_SMAJ16A_C74561 |
| Inventory line | line-c74561 |
Fit: Fitted
Identity state: VERIFIED
Source state: AVAILABLE
Coverage: 2 open of 2 published
Documents and package
Datasheet PDF
Footprint preview
SMA_Littelfuse_SMAJ16A_C74561. 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.
Datasheet PDF — Littelfuse SMAJ Series Surface Mount 400W datasheet
Selected source ID: src-c74561-primary
Authority: MANUFACTURER_MIRROR
Availability: AVAILABLE
Package footprint: SMA_Littelfuse_SMAJ16A_C74561
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 | D5 |
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.
primary-specification
Coverage ID: cov-c74561-primary-specification · Status: OPEN
Reason: Manufacturer-authored mirror is hash-locked and agrees with primary web text; primary PDF binary download denied403. No primary-binary verification is claimed.
Facts in this domain:
Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.
assembled-qualification
Coverage ID: cov-c74561-assembled-qualification · Status: OPEN
Reason: Prototype pulse/thermal/NVM and model limits are explicit; no universal protection closure.
Facts in this domain:
Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.
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.
TYPICAL_CURVE
A representative figure read from a characteristic curve. Typical values are not guaranteed and vary part to part.
Fact: fact-c74561-vbr-tempco-typ
Value: 0.1 · Unit: %/C
Conditions: Typical VBR coefficient0.1%/C. Neither a guaranteed bound nor a clamp-voltage coefficient. No hot VC limit is inferred. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
TRANSIENT
Behaviour during a short event — startup, a switching edge, a fault or a surge.
Fact: fact-c74561-ipp
Value: 15.4 · Unit: A
Conditions: Maximum peak pulse current for the10/1000 us waveform at TA = 25 C; apply initial-junction-temperature derating, repetition and waveform conditions. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-peak-power
Value: 400 · Unit: W
Conditions: 400W peak10/1000us nonrepetitive pulse at25C, manufacturer test uses5x5mm copper per terminal. Derate above initialTJ25C; stated0.01% duty. Current PCB lands do not establish this test thermal environment or assembled pulse capacity. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
PROTECTION_STANDOFF
The voltage a protection device is expected to sit at without conducting.
Fact: fact-c74561-standoff
Value: 16 · Unit: V
Conditions: Rated reverse standoff VWM; TA = 25 C table condition. Covers nominal 15 V + 5% = 15.75 V at that condition. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
PROTECTION_BREAKDOWN
The voltage at which a protection device begins to conduct.
Fact: fact-c74561-vbr-min
Value: 17.8 · Unit: V
Conditions: Minimum breakdown at IT = 1 mA, TA = 25 C. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-vbr-max
Value: 19.7 · Unit: V
Conditions: Maximum breakdown at IT = 1 mA, TA = 25 C. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
PROTECTION_CLAMP
The voltage a protection device clamps to while conducting its rated surge current.
Fact: fact-c74561-clamp
Value: 26 · Unit: V
Conditions: Maximum clamping VC at IPPM = 15.4 A, 10/1000 us waveform, TA = 25 C. This is not an all-temperature or arbitrary-waveform voltage ceiling. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
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: fact-c74561-manufacturer
Value: Littelfuse · Unit: NONE
Conditions: Manufacturer-authored datasheet title and exact family part row. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-identity
Value: lcsc=C74561; manufacturer=Littelfuse; mpn=SMAJ16A; variant=unidirectional SMA TVS · Unit: NONE
Conditions: Exact catalog identity only; current stock and assembly quote remain unconfirmed.
Verdict: CONFIRMED - distributor identity only · Provenance: DISTRIBUTOR-IDENTITY
Evidence: src-c74561-identity — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-pad-gap-max
Value: 2.3 · Unit: mm
Conditions: Manufacturer solder pads: width>=1.8mm,length>=2.1mm,gap<=2.3mm. Project pads2.1x1.8mm centered at localX+/-1.8mm give1.5mm gap and5.7mm outerspan. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-polarity
Value: Cathode identified by body stripe · Unit: NONE
Conditions: Manufacturer package drawing identifies cathode band. Project symbol/footprint maps pin 1 to cathode at local -X and pin 2 to anode at +X; imported/project number assignment is independently checked against stripe orientation. Manufacturer-authored mirror and independently reviewed primary text agree; primary binary hash is unavailable.
Verdict: UNSOURCED · Provenance: UNVERIFIED
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-prototype-qualification
Value: Bounded prototype change; qualification remains open · Unit: NONE
Conditions: First attach for NVM programming must use5 V-only input. Verify15 V-only policy before use;20 V operation is unsupported and can produce sustained TVS conduction. The 26 V room-temperature pulse point improves the previous 32.4 V mismatch but does not qualify hot clamping, overshoot, source surge energy, return paths or repeated pulses.
Verdict: NEEDS BENCH · Provenance: PROJECT-CHOICE
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Fact: fact-c74561-model-provenance
Value: Illustrative standard SMA model · Unit: NONE
Conditions: Model originally obtained from C3024223 EasyEDA import and retained as an illustrative standard SMA body, not an exact manufacturer model. Land geometry and cathode mapping follow each exact manufacturer drawing. Filename for C74561 identifies usage, not manufacturer model provenance.
Verdict: NEEDS BENCH · Provenance: PROJECT-CHOICE
Evidence: src-c74561-primary — Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
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-c74561
Symbol:
SMAJ16AFootprint:
SMA_Littelfuse_SMAJ16A_C74561Pins: 2
Pin assignments
| Symbol pin | Name | Footprint pad | Function |
|---|---|---|---|
1 | K | 1 | cathode, banded end, local negative X |
2 | A | 2 | anode, local positive X |
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.
No interaction is published for this record.
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-tvs-clamp-vs-absmax— tvs-clamp-vs-absmax — rule verdict: UNSOURCEDrule-u4-inverting-stress— u4-inverting-stress — rule verdict: NEEDS BENCHrule-q1-gate-drive-vs-contract— q1-gate-drive-vs-contract — rule verdict: NEEDS BENCH
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.
Littelfuse SMAJ Series Surface Mount 400W datasheet
Source ID: src-c74561-primary · Authority: MANUFACTURER_MIRROR
| Field | Recorded value |
|---|---|
| Document number | SMAJ series |
| Revision | 11/20/15 (manufacturer-authored JLCPCB mirror) |
| Document date | 2015-11-20 |
| Retrieved | 2026-09-21 |
| Printed page | 2 |
Locator: Page2 Electrical Characteristics exact SMAJ16A row; page1 notes/features; page5 Dimensions and solder pads
Availability: AVAILABLE
SMAJ16A distributor identity
Source ID: src-c74561-identity · Authority: DISTRIBUTOR_IDENTITY
| Field | Recorded value |
|---|---|
| Document number | C74561 |
| Revision | 2026-09-21 |
| Document date | 2026-09-21 |
| Retrieved | 2026-09-21 |
| Printed page | web |
Locator: Product identity table manufacturer/MPN/LCSC/package rows
Availability: AVAILABLE
Document URL: https:
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. |
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. |
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 |
|---|---|
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. |
PROTECTION_BREAKDOWN | The voltage at which a protection device begins to conduct. |
PROTECTION_CLAMP | The voltage a protection device clamps to while conducting its rated surge current. |
PROTECTION_STANDOFF | The voltage a protection device is expected to sit at without conducting. |
TRANSIENT | Behaviour during a short event — startup, a switching edge, a fault or a surge. |
TYPICAL_CURVE | A representative figure read from a characteristic curve. Typical values are not guaranteed and vary part to part. |
Coverage status
| Recorded term | What it means |
|---|---|
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 |
|---|---|
DISTRIBUTOR_IDENTITY | A distributor listing. Establishes which part this is, nothing more. |
MANUFACTURER_MIRROR | A copy of a manufacturer document hosted elsewhere. Usable, but weaker than the manufacturer's own copy. |
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.
No owning bundle is identified in the published model.