Part Review and Datasheet Validation

flux

2:06

Gathering project details.

Reviewing the bill of materials.

Analyzing the schematic.

Analyzing the PCB layout.

Looking for "Manufacturer part number, package type, pin count, part description, operating voltage range, current consumption, interface type, accuracy, response time, and any ordering/package details for SHT41-AD1B-R2." in Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf

Looking for "Complete pin table or pinout for SHT41-AD1B-R2 with pin numbers, pin names, and pin descriptions/functions." in Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf

Looking for "Package dimensions, footprint recommendation, land pattern, and any package name for SHT41-AD1B-R2." in Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf

Looking for "Part marking, package outline, and terminal/pad numbering orientation for SHT41-AD1B-R2." in Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf

Searching the project.

Analyzing the PCB layout.

Searching for project components.

Searching 4 domains.

Searching for footprint details.

Searching 3 domains.

Looking for "package dimensions pad pitch land pattern SHT41-AD1B-R2 DFN terminal size overall dimensions" in Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf

Searching fetch_url.

Looking for "exact dimensions Figure 15 Figure 17 package outline 1.5 x 1.5 pad dimensions pitch terminal size SHT4x mm" in Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf

Considering pin type details.

Search complete — 70 results across 5 domains.

Part Review Summary
I reviewed the part project for SHT41-AD1B-R2 against the official Sensirion datasheet already linked in the project.

Datasheet URL

CheckResult
Datasheet URL presentYes
URL appears officialYes, Sensirion PDF
Project updatedNo update needed

Datasheet-Derived Part Info

FieldDatasheet Value
MPNSHT41-AD1B-R2
ManufacturerSensirion
Package4-pin open-cavity DFN
Pin count4
InterfaceI2C, address 0x44
Supply range1.08 V to 3.6 V
Idle current0.08 µA typ, 1.0 µA max
Measurement current320 µA typ, 500 µA max
RH accuracy±1.8 %RH typ
Temperature accuracy±0.2 °C typ
RH response time4 s
Temperature response time2 s
Body size1.5 mm x 1.5 mm x 0.54 mm
Pad pitch0.8 mm
Reference pad size0.5 mm x 0.3 mm

Project Property Review

PropertyCurrent Project ValueDatasheet CheckStatus
Manufacturer Part NumberSHT41-AD1B-R2MatchesOK
Manufacturer NameSensirionMatchesOK
Part TypeSensorsReasonableOK
Datasheet URLSet to official Sensirion PDFMatchesOK
Designator PrefixICAcceptable for this part styleOK
Package or Case CodeNot presentDatasheet specifies 4-pin DFNMissing detail
Project description"Board Mount Humidity Sensors Intermediate Humidity and Temperature Sensor"Broadly correct but not very specificCould be improved
Schematic Symbol Cross-Check

Existing terminals

TerminalPin Number in ProjectDatasheet FunctionResult
SDA1Serial data, bidirectionalMatch
SCL2Serial clock, inputMatch
VDD3Supply voltageMatch
VSS4GroundMatch

Symbol findings

CheckResult
Pin count4/4, matches datasheet
Pin namesMatch
Pin numbersMatch
Symbol completenessNo missing pins found
Pin type propertiesMismatch
Pin type mismatches
All four terminals are currently set to Unspecified in the project, but the datasheet supports more accurate types:

Table

TerminalCurrent TypeRecommended Type
SDAUnspecifiedBi-Directional
SCLUnspecifiedInput
VDDUnspecifiedPower In
VSSUnspecifiedGround
Footprint Cross-Check

What is present in the project

CheckResult
Footprint existsYes
Pad count4 pads present
Pad labelsSDA, SCL, VDD, VSS
Footprint-level geometry exposed by project dataLimited

Footprint vs datasheet

CheckResult
4-pad package structureConsistent with datasheet
Pad naming consistencyConsistent
Exact pad geometry verificationNot fully verifiable from available layout data
Datasheet package expectations4-pin DFN, 0.8 mm pitch, ref. pad 0.5 mm x 0.3 mm
Important land-pattern noteNo copper under sensor except pin pads; central die pad should not be soldered

Key Specs to Keep With the Part

CategoryValue
FunctionHumidity and temperature sensor
BusI2C
Fixed address0x44
Voltage1.08 V to 3.6 V
RH accuracy±1.8 %RH typ
Temp accuracy±0.2 °C typ
Package4-pin DFN
Size1.5 mm x 1.5 mm x 0.54 mm

Mismatches / Gaps Flagged

ItemSeverityNote
Pin Type properties all set to UnspecifiedMediumShould be corrected for ERC quality
Package or Case Code property missingLowShould be set to something like 4-pin DFN
Description is genericLowCould be rewritten to include I2C address and accuracy class
Exact footprint geometry not fully confirmedMediumAvailable layout data did not expose pad dimensions/pitch directly
Bottom Line
  • MPN, manufacturer, datasheet URL, pin names, pin numbers, and 4-pin structure all look correct.
  • The main issue is that the schematic terminals are not typed correctly.
  • The footprint appears structurally consistent, but I could not fully confirm exact land-pattern dimensions from the project data alone.
If you want, I can fix the terminal Pin Type properties and add the missing Package or Case Code metadata next.
Fix the mismatches
Check power parts first
Use official datasheets
Include availability check
3 days
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Documents

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    Assets

    SHT41-AD1B-R2

    SHT41-AD1B-R2

    SHT41-AD1B-R2 Symbol.svgDefault
    SHT41-AD1B-R2-thumb.png

    SHT41-AD1B-R2-thumb.png

    SHT41-AD1B-R2-thumbThumbnail
    kicad_mod

    SHT41-AD1B-R2

    SHT41AD1BR2.kicad_modFootprint
    stp

    SHT41-AD1B-R2

    SHT41-AD1B-R2.stp3D Model

    SHT41-AD1B-R2

    SHT41-AD1B-R2 thumbnail
    Board Mount Humidity Sensors Intermediate Humidity and Temperature Sensor Humidity, Temperature 0 ~ 100% RH I2C ±1.8% RH 4 s Surface Mount The SHT41-AD1B-R2 is a fully calibrated, low-power environmental sensor that measures relative humidity (RH) and temperature. It integrates sensing elements, signal processing, and a digital interface into a small surface-mount package, making it ideal for space-constrained designs. Key Features Sensor Type: Digital humidity and temperature sensor Interface: I²C (easy MCU integration) Supply Voltage: ~1.08 V to 3.6 V Humidity Accuracy: up to ±1.8% RH (typical) Temperature Accuracy: up to ±0.2 °C (typical) Response Time: Fast measurement and low latency Power Consumption: Ultra-low, suitable for battery devices Package: DFN (compact, ~1.5 × 1.5 mm) Factory Calibration: No external calibration required Functional Overview The sensor uses capacitive humidity sensing combined with a bandgap temperature sensor. Internal electronics convert these measurements into digital data via I²C, eliminating the need for external ADCs or complex signal conditioning. Design Advantages Small footprint for compact PCBs Low power consumption for IoT and portable devices High reliability with long-term stability Fast response time for real-time monitoring Simple integration with microcontrollers Typical Applications IoT and smart home devices HVAC and climate control systems Wearables and portable electronics Industrial monitoring systems Environmental data logging #CommonPartsLibrary #Sensors,-Transducer #Humidity #Moisture-Sensor #SHT4x

    Properties

    SHT41-AD1B-R2

    Sensirion

    Sensors

    sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf

    U

    creativecommons.org/licenses/by/4.0/

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