Part Review and Datasheet Validation

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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
Sign up to send
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SHT41-AD1B-R3

SHT41-AD1B-R3 thumbnail
Humidity, Temperature 0 ~ 100% RH I2C ±1.8% RH 4 s Surface Mount
The SHT41-AD1B-R3 is a high-precision digital humidity and temperature sensor developed by Sensirion. It integrates calibrated sensing elements, analog signal processing, and a digital communication interface within a compact surface-mount package optimized for space-constrained embedded applications. The device is designed for accurate environmental monitoring across industrial, consumer, HVAC, portable electronics, and IoT systems.
The sensor utilizes Sensirion CMOSens® technology to provide stable long-term performance, fast response time, and excellent repeatability under varying environmental conditions. Factory calibration enables direct digital output without the need for external calibration circuitry. The integrated I²C interface simplifies system integration with microcontrollers and embedded processors.
The SHT41-AD1B-R3 is engineered for low-power operation, making it suitable for battery-powered and energy-efficient designs. Its compact DFN package supports automated assembly processes and high-density PCB layouts. The device also incorporates advanced internal diagnostics and checksum protection to improve communication reliability and data integrity.
Features
High-accuracy relative humidity sensing
High-accuracy temperature measurement
Fully calibrated and linearized digital output
I²C digital communication interface
Low power consumption optimized for portable systems
Fast response and measurement conversion time
Excellent long-term stability and repeatability
Integrated heater functionality for condensation mitigation
Wide operating voltage range
Compact surface-mount DFN package
Factory-trimmed and tested performance
High immunity to environmental stress and contamination
Low drift over product lifetime
Suitable for reflow soldering processes
Electrical Characteristics
Supply voltage supports low-voltage embedded systems
Digital communication compatible with standard I²C hosts
Low standby current consumption
Optimized active measurement current
Integrated CRC data protection for communication integrity
Environmental Characteristics
Wide operating temperature range
Wide relative humidity operating range
Designed for high reliability in industrial and consumer environments
Resistant to moisture-induced performance degradation
Supports long operational lifetime with stable calibration
Package Information
Compact DFN surface-mount package
Moisture-sensitive device suitable for automated assembly
RoHS compliant and halogen-free construction
Tape-and-reel packaging configuration for production assembly
Applications
Environmental monitoring systems
HVAC and climate control equipment
Smart home and IoT devices
Portable electronics
Industrial automation systems
Data loggers and instrumentation
Weather monitoring equipment
Indoor air quality monitoring
Battery-powered sensor nodes
Consumer electronic products
#commonpartslibrary #sensor #temperature #humidity #environmentalsensor #i2c #embedded #industrial #iot #sensirion

Properties

SHT41-AD1B-R3

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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