Part Audit Review
Review all available part information (MPN, package, pin count, description, properties). If no datasheet URL is already set, search the web for the official datasheet and update the part's Datasheet property with the URL. Then cross-check the schematic symbol, footprint, and pin descriptions against the datasheet. Summarize key specs and flag any mismatches.
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I’ll audit the part metadata, source the official datasheet if needed, update the Datasheet property, then verify symbol pins and footprint against the manufacturer documentation.
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Created a project doc
LM1117 Part Audit
The footprint is substantially consistent with TI's NDP0003B (TO-252) package, but the part project is not internally identity-consistent. N...
Audit complete. The Datasheet URL was already populated, so it was not changed; the main mismatches are adjustable-variant title/description, non-orderable MPN shorthand, missing VOUT pin 2 representation, absent pin descriptions/types, and 1.7 mm small pads versus TI’s 2.15 mm example land pattern.
Full findings and key LM1117-1.8 specifications are in LM1117 Part Audit.
Fix metadata and symbol
Use exact TI MPN
Correct footprint pads
Run part checks
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LM1117 Part Audit
Audit result
The footprint is substantially consistent with TI's NDP0003B (TO-252) package, but the part project is not internally identity-consistent. No part properties or geometry were changed because a Datasheet URL was already populated.
Current metadata
Table
| Field | Current value | Assessment |
|---|---|---|
| Project title | LM1117DT-ADJ/NOPB | Mismatch: adjustable variant, not fixed 1.8 V |
| MPN | LM1117-1P8NDP | Ambiguous/non-orderable shorthand; not listed as a TI orderable MPN |
| Manufacturer | Texas Instruments | Correct |
| Description | Adjustable-output LM1117 description | Mismatch with fixed 1.8 V intent |
| Part Type | Linear Regulator | Correct |
| Package property | Absent | Footprint/model identify NDP0003B, TO-252 |
| Pin-count property | Absent | TI package is 3-pin; symbol terminals are numbered 1, 3, 4 |
| Datasheet URL | Existing Google-hosted PDF | Present; not replaced |
Official TI datasheet: https://www.ti.com/lit/ds/symlink/lm1117.pdf
TI lists the fixed-1.8 V NDP orderables as
LM1117DT-1.8/NOPB (tube) and LM1117DTX-1.8/NOPB (tape-and-reel), plus .B variants. The exact carrier/orderable identity cannot be determined from the current shorthand MPN.Key specifications for fixed 1.8 V LM1117
- 800 mA low-dropout linear regulator
- Nominal output: 1.8 V
- Output at 25 C, 10 mA, VIN = 3.8 V: 1.782 V to 1.818 V
- Output across 0 C to 125 C: 1.746 V to 1.854 V
- Recommended maximum VIN: 15 V
- Absolute maximum VIN: 20 V
- Dropout at 800 mA: 1.2 V typical at 25 C; 1.3 V maximum across temperature
- Current limit at 25 C: 800 mA to 1500 mA; 1200 mA typical
- Output capacitor: minimum 10 uF tantalum, ESR 0.3 ohm to 22 ohm
- Recommended input bypass: 10 uF tantalum
- NDP listed operating temperature: 0 C to 125 C
Symbol and pin audit
Table
| Terminal | Current number | Current type | Datasheet mapping | Finding |
|---|---|---|---|---|
| GND | 1 | Unspecified | Pin 1, GND for fixed variant | Name is valid; description/type missing |
| INPUT | 3 | Unspecified | Pin 3, VIN | Function correct; canonical name, description/type missing |
| OUT | 4 | Unspecified | Pin 2 and tab are VOUT | Output tab mapping is valid, but electrical pin 2 is omitted |
The TI NDP electrical pinout is pin 1 = GND, pin 2 = VOUT, pin 3 = VIN, with the tab also connected to VOUT. The footprint's large land is numbered 4 in TI's NDP land-pattern drawing, so mapping symbol terminal 4 to the output tab is mechanically consistent. However, the symbol does not expose or document pin 2, leaving the pin-2/tab equivalence ambiguous.
Additional symbol issues:
- All terminal electrical types are
Unspecified. - Pin descriptions are absent.
- Custom symbol text renders as missing-glyph boxes.
Footprint audit
The footprint asset is named
LM1117DT-ADJ/NOPB.kicad_mod, which conflicts with the intended fixed-output identity, but the geometry targets NDP0003B.Table
| Land | Current geometry | TI example land pattern | Assessment |
|---|---|---|---|
| Pad 1 | 1.3 x 1.7 mm | 1.3 x 2.15 mm | Length mismatch |
| Pad 3 | 1.3 x 1.7 mm | 1.3 x 2.15 mm | Length mismatch |
| Pad 4/tab | 5.5 x 5.7 mm | 5.5 x 5.7 mm | Correct |
| Small-pad pitch | 4.57 mm | 4.57 mm | Correct |
Other mechanical findings:
- TI nominal body: 6.58 x 6.10 mm
- Package: NDP0003B / TO-252, 2.55 mm maximum height
- A compatible
NDP0003B.stpmodel is present - Fabrication geometry contains duplicated line groups near one lead; copper is unaffected
- Source KiCad dimensions are in millimeters and appear correctly scaled
- Layout inspection reports values such as 0.0013 while labeling the unit as mm; these appear to be internal meter values with a misleading displayed unit. If interpreted literally as mm the footprint would be 1000x too small, so this is a readout/unit-label ambiguity worth verifying visually or with an export
Flagged mismatches
- Project title identifies the adjustable version.
- Description identifies the adjustable version.
- MPN is not an exact TI orderable number.
- Package and pin-count properties are absent.
- Symbol omits electrical pin 2 and does not document its equivalence to output tab/pad 4.
- Pin descriptions and electrical types are absent.
- Small pads are 1.7 mm long versus TI's 2.15 mm example land pattern.
- Symbol text renders incorrectly.
- Computed footprint readout has a meter/mm labeling ambiguity.
Recommended corrections
- Select the exact orderable MPN:
LM1117DT-1.8/NOPBorLM1117DTX-1.8/NOPB. - Rename the project/assets and rewrite the description for the fixed 1.8 V variant.
- Set package metadata to NDP0003B / TO-252 and pin count to 3 where supported.
- Add pin descriptions and appropriate electrical types.
- Explicitly represent or document VOUT pin 2 and tab/pad 4 as the same electrical node.
- Confirm whether the intended small-land length is TI's 2.15 mm example value; update if no alternate qualified land pattern is intended.
- Repair the symbol font/glyph rendering.
- Verify effective footprint scale in a dimensional export or board view.
Audit result
Current metadata
Key specifications for fixed 1.8 V LM1117
Symbol and pin audit
Footprint audit
Flagged mismatches
Recommended corrections
