Part Review and Datasheet Verification

adrian95

adrian95

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 inspect the part metadata, look for an official datasheet if needed, then verify symbol pins/footprint/pin descriptions against it and update the Datasheet property if it’s missing.

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The part already has a Datasheet URL set, so I’m using that linked ON Semiconductor datasheet for verification.

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Completed the part review and saved the detailed findings in part-review-ncp785ah120t1g.
Key flags: the Datasheet URL was already set; the part matches NCP785AH120T1G 12 V SOT-89 regulator, but the project description appears to have a quiescent-current typo (15A vs µA), PSRR wording mismatch, overly broad package property (TO vs SOT-89-3), and missing/unspecified pin descriptions/types. The 4th pad is acceptable if it represents the GND tab, but it should be clearly labeled as Tab / GND and tied to GND.
Fix metadata and verify
Fix flagged issues
Add pin descriptions
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Part Review: NCP785AH120T1G
Source data reviewed
  • Project: adrian95/ncp785ah120t1g
  • Manufacturer Part Number: NCP785AH120T1G
  • Manufacturer Name: ON Semiconductor
  • Existing Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/262a2e233d7493f3560ba706ebeacba31f93f9dbdcd05e8573d0529fee7ffe35.pdf
  • Package property in project: TO
  • Project description: Operating Input Voltage: Up to 450 VDC ; PSRR: 80 dB at 120 Hz; Quiescent Current: 15A Typical; SOT89 Package
  • Schematic terminals present: VIN pin 1, GND_1 pin 2, VOUT pin 3, GND_2 pin 4
  • Layout nodes present: 4 pads plus footprint/container/root nodes
Datasheet key specs found
From the linked ON Semiconductor / onsemi NCP785A datasheet:
  • Device family: NCP785A high-voltage linear regulator
  • Variant reviewed: NCP785AH120T1G
  • Function: wide-input, ultra-low-Iq, high-PSRR linear regulator
  • Fixed output voltage: 12 V
  • Guaranteed output current: 10 mA
  • Operating input voltage for 12 V variant: 55 VDC to 450 VDC
  • Absolute maximum input voltage: -0.3 V to 700 V, with note for 650 V peak max for 1 ms non-repeated
  • Output voltage accuracy: 12 V typical; 11.4 V to 12.6 V over line/load/temperature
  • Quiescent current for 12 V variant: 17 µA typical, 22 µA maximum at IOUT = 0, VIN = 55 V to 450 V
  • Ground current: 25 µA maximum over load range
  • PSRR for 12 V table: 70 dB typical at 1 kHz with VIN = 340 VDC + 1 Vpp modulation and IOUT = 100 µA
  • Datasheet feature summary also states 70 dB at 60 Hz and 90 dB at 100 kHz
  • Required input capacitor: 2.2 µF from VIN to GND
  • Required output capacitor: 22 µF or larger MLCC from VOUT to GND
  • Package: thermally enhanced SOT-89-3, Pb-free, tape and reel, marking AJ
  • Mechanical case: SOT-89, 3 lead, Case 528AG
  • Thermal resistance junction-to-air: 79 °C/W
Datasheet pinout

Table

Datasheet pinNameDescription
1VINSupply voltage input; connect 2.2 µF capacitor from VIN to GND
2, TabGNDGround connection
3VOUTRegulator output; connect 22 µF or larger MLCC capacitor from VOUT to GND
Cross-check results
MPN and manufacturer
  • NCP785AH120T1G matches the datasheet ordering table for the 12 V SOT-89 variant.
  • Manufacturer is listed as ON Semiconductor / onsemi. This is acceptable, though onsemi is the current public brand.
Datasheet property
  • A Datasheet URL is already set, so no Datasheet property update was required under the user instruction.
  • The linked PDF content matches the expected onsemi NCP785A datasheet.
Symbol / terminals
  • The project uses four terminal components:
    • Pin 1: VIN — matches datasheet.
    • Pin 2: GND_1 — matches datasheet pin 2 GND.
    • Pin 3: VOUT — matches datasheet.
    • Pin 4: GND_2 — likely intended to represent the SOT-89 tab, which the datasheet lists as connected to GND.
  • This is electrically reasonable for a 4-pad footprint representation, but the datasheet describes the package as SOT-89-3 with pin 2, Tab = GND, not a separate numbered pin 4.
Footprint / package
  • The datasheet package is SOT-89, 3 lead, Case 528AG.
  • The project currently has four PCB pads. That can be correct if the footprint models the exposed tab/large tab land as a separate pad while tying it to GND.
  • The project package property is TO, which is too broad / misleading compared with the datasheet package SOT-89-3 / SOT-89, 3 Lead, Case 528AG.
Pin descriptions and properties
  • Terminal pin numbers are present, but explicit pin descriptions are not populated on the terminal components.
  • Pin type is Unspecified on all terminals. For a regulator symbol, more precise pin types would be preferable:
    • VIN: Power input
    • GND / Tab: Ground or power return
    • VOUT: Power output
Mismatches / issues flagged
  1. Project description quiescent current typo: Description says Quiescent Current: 15A Typical; datasheet indicates µA-level quiescent current. For this 12 V variant, it is 17 µA typical and 22 µA max under the stated conditions. This should not be 15A.
  2. Project description PSRR value/frequency mismatch: Description says 80 dB at 120 Hz; datasheet content reviewed states 70 dB at 60 Hz in the feature list and 70 dB typical at 1 kHz in the 12 V electrical table, plus 90 dB at 100 kHz. I did not find 80 dB at 120 Hz in the extracted datasheet content.
  3. Package property mismatch: Project property Package or Case Code: TO should be updated to SOT-89-3 or SOT-89, 3 Lead, Case 528AG.
  4. Pin 4 / tab representation needs clarity: The schematic/footprint has a separate pin 4 named GND_2; datasheet names this as Tab tied to GND, not pin 4. If keeping four pads, label pin 4 description as Tab / GND and ensure it is electrically tied to GND.
  5. Missing pin descriptions / pin types: Existing terminals have unspecified pin type and no useful pin-description metadata.
  6. BOM empty: Since this is a part project, no BOM item is expected, but the BOM tool reports no added parts.
  • Update project/package metadata to SOT-89-3 or SOT-89, 3 Lead, Case 528AG.
  • Correct the description to reflect: 450 VDC max operating input, 12 V fixed output, 10 mA output current, 17 µA typ quiescent current, SOT-89-3 package.
  • Add pin descriptions:
    • Pin 1 VIN: Supply voltage input; connect 2.2 µF capacitor from VIN to GND.
    • Pin 2 GND: Ground connection.
    • Pin 3 VOUT: 12 V regulator output; connect 22 µF or larger MLCC to GND.
    • Tab pad / pin 4 GND: Thermal tab / ground; tied to GND.
  • Set pin types to power input / ground / power output where supported.
Automated review checks
Part review checks were queried, but no matching SUCCESS/WARNING/ERROR/UNCERTAIN component-review results were returned for the selected check set at the time of review.

  • Source data reviewed

  • Datasheet key specs found

  • Datasheet pinout

  • Cross-check results

  • MPN and manufacturer

  • Datasheet property

  • Symbol / terminals

  • Footprint / package

  • Pin descriptions and properties

  • Mismatches / issues flagged

  • Recommended property cleanup

  • Automated review checks

Documents

  • Part Review: NCP785AH120T1G

Assets

NCP785AH120T1G

NCP785AH120T1G

NCP785AH120T1G Symbol.svgDefault
NCP785AH120T1G-thumb.png

NCP785AH120T1G-thumb.png

NCP785AH120T1G-thumbThumbnail
kicad_mod

MC78L05ACHX_1.kicad_mod

FP_MC78L05ACHX_1Footprint
stp

NCP785AH120T1G.stp

3D_NCP785AH120T1G3D Model

NCP785AH120T1G

NCP785AH120T1G thumbnail
Linear Voltage Regulator IC Positive Fixed 1 Output 10mA SOT-89-3
The NCP785A is a high−performance linear regulator, offering a very wide operating input voltage range of up to 450 V DC, with an output current of up to 10 mA. Ideal for high input voltage applications such as industrial and home metering, home appliances. The NCP785A family offers ±5% initial accuracy, extremely high−power supply rejection ratio and ultra−low quiescent current. The NCP785A is optimized for high−voltage line and load transients, making this part ideal for harsh environment applications. The NCP785A is offered in fixed output voltage options 3.3 V, 5.0 V, 12 V and 15 V. SOT−89 package offers good thermal performance and help to minimize the solution size. Features • Wide Input Voltage Range: DC: Up to 450 V AC: 85 V to 260 V (half−wave rectifier and 2.2 F capacitor) • 10 mA Guaranteed Output Current • Ultra Low Quiescent Current: Typ. 10 A (VOUT ≤ 5 V) • ±5% Accuracy Over Full Load, Line and Temperature Variations • Ultra−high PSRR: 70 dB at 60 Hz, 90 dB at 100 kHz • Stable with Ceramic Output Capacitor 22 F MLCC • Thermal Shutdown and Current Limit Protection • Available in Thermally Enhanced SOT89−3 Package • This is a Pb−Free Device Typical Applications • Industrial Applications, Home Appliances • Home Metering / Network Application • Off−line Power Supplies
#NCP785AH120T1G #onsemi #LDO #VoltageRegulator #PowerManagement #HighVoltage #IndustrialElectronics #SmartMeter #HomeAutomation #SOT89 #LowPowerDesign #ElectronicsDesign

Properties

NCP785AH120T1G

ON Semiconductor

Integrated Circuit

onsemi.com/pdf/datasheet/ncp785a-d.pdf

IC

SOT-89, 3 Lead

parametric-v1

creativecommons.org/licenses/by/4.0/

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