Part Review and Datasheet Validation

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

Check	Result
Datasheet URL present	Yes
URL appears official	Yes, Sensirion PDF
Project updated	No update needed

Datasheet-Derived Part Info

Field	Datasheet Value
MPN	SHT41-AD1B-R2
Manufacturer	Sensirion
Package	4-pin open-cavity DFN
Pin count	4
Interface	I2C, address 0x44
Supply range	1.08 V to 3.6 V
Idle current	0.08 µA typ, 1.0 µA max
Measurement current	320 µA typ, 500 µA max
RH accuracy	±1.8 %RH typ
Temperature accuracy	±0.2 °C typ
RH response time	4 s
Temperature response time	2 s
Body size	1.5 mm x 1.5 mm x 0.54 mm
Pad pitch	0.8 mm
Reference pad size	0.5 mm x 0.3 mm

Project Property Review

Property	Current Project Value	Datasheet Check	Status
Manufacturer Part Number	SHT41-AD1B-R2	Matches	OK
Manufacturer Name	Sensirion	Matches	OK
Part Type	Sensors	Reasonable	OK
Datasheet URL	Set to official Sensirion PDF	Matches	OK
Designator Prefix	IC	Acceptable for this part style	OK
Package or Case Code	Not present	Datasheet specifies 4-pin DFN	Missing detail
Project description	"Board Mount Humidity Sensors Intermediate Humidity and Temperature Sensor"	Broadly correct but not very specific	Could be improved

Schematic Symbol Cross-Check

Existing terminals

Terminal	Pin Number in Project	Datasheet Function	Result
SDA	1	Serial data, bidirectional	Match
SCL	2	Serial clock, input	Match
VDD	3	Supply voltage	Match
VSS	4	Ground	Match

Symbol findings

Check	Result
Pin count	4/4, matches datasheet
Pin names	Match
Pin numbers	Match
Symbol completeness	No missing pins found
Pin type properties	Mismatch

Pin type mismatches

All four terminals are currently set to Unspecified in the project, but the datasheet supports more accurate types:

Table

Terminal	Current Type	Recommended Type
SDA	Unspecified	Bi-Directional
SCL	Unspecified	Input
VDD	Unspecified	Power In
VSS	Unspecified	Ground

Footprint Cross-Check

What is present in the project

Check	Result
Footprint exists	Yes
Pad count	4 pads present
Pad labels	SDA, SCL, VDD, VSS
Footprint-level geometry exposed by project data	Limited

Footprint vs datasheet

Check	Result
4-pad package structure	Consistent with datasheet
Pad naming consistency	Consistent
Exact pad geometry verification	Not fully verifiable from available layout data
Datasheet package expectations	4-pin DFN, 0.8 mm pitch, ref. pad 0.5 mm x 0.3 mm
Important land-pattern note	No copper under sensor except pin pads; central die pad should not be soldered

Key Specs to Keep With the Part

Category	Value
Function	Humidity and temperature sensor
Bus	I2C
Fixed address	0x44
Voltage	1.08 V to 3.6 V
RH accuracy	±1.8 %RH typ
Temp accuracy	±0.2 °C typ
Package	4-pin DFN
Size	1.5 mm x 1.5 mm x 0.54 mm

Mismatches / Gaps Flagged

Item	Severity	Note
Pin Type properties all set to Unspecified	Medium	Should be corrected for ERC quality
Package or Case Code property missing	Low	Should be set to something like 4-pin DFN
Description is generic	Low	Could be rewritten to include I2C address and accuracy class
Exact footprint geometry not fully confirmed	Medium	Available 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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Project Name

SHT41-AD1B-R2

Description

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

Manufac… Number

SHT41-AD1B-R2

Manufac…er Name

Sensirion

Part Type

Sensors

Datasheet URL

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

Designator Prefix

License

creativecommons.org/licenses/by/4.0/

Pricing & Availability

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