SHT41A-BD1B-R2 Equivalent & Substitute Parts

Part Overview

The SHT41A-BD1B-R2 is an automotive-grade humidity and temperature sensor manufactured by Sensirion AG, part of the SHT4 series. This surface-mount component integrates dual sensing capability with I2C digital output, designed for applications requiring simultaneous humidity and temperature measurement in automotive environments. The part maintains Active product status with 3,419 units currently in stock. Substitute parts are identified to address inventory availability, lead time requirements, or specific application constraints while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Sensor Type	Humidity, Temperature
Humidity Range	0 ~ 100% RH
Output Type	I2C
Output Resolution	16-bit
Accuracy	±2% RH
Response Time	4 seconds
Supply Voltage	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package	4-UDFN Exposed Pad (4-DFN 1.5x1.5)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SHT41A-BD1B-R2 is determined by strict equivalence across the following critical parameters: sensor type (humidity and temperature), humidity measurement range (0 ~ 100% RH), output protocol (I2C), output resolution (16-bit), measurement accuracy (±2% RH), response time (4 seconds), supply voltage range (2.3V ~ 5.5V), operating temperature range (-40°C ~ 125°C), mounting type (surface mount), package configuration (4-UDFN exposed pad with 1.5x1.5mm footprint), and compliance certifications (ROHS3, MSL 1).

All identified substitute parts maintain identical electrical specifications and mechanical compatibility. Variations in part numbering reflect differences in application classification (automotive vs. industrial) or packaging revision levels, which do not affect functional interchangeability in applications designed for the SHT41A-BD1B-R2.

Parameter Comparison

Part Number	Manufacturer	Series	Sensor Type	Humidity Range	Output Type	Accuracy	Response Time	Supply Voltage	Operating Temp	Package	Inventory (Pcs)	Product Status
SHT41A-BD1B-R2	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	3,419	Active
SHT40A-AD1B-R3	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	11,019	Active
SHT40A-FD1B-R3	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	10,774	Active
SHT40I-BD1B-R3	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	10,284	Active
SHT41A-AW1B-R2	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	3,164	Active
SHT41A-AW1B-R3	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	9,277	Active
SHT41A-BD1B-R3	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	8,657	Active
SHT41A-FD1B-R2	Sensirion AG	SHT4	Humidity, Temperature	0 ~ 100% RH	I2C	±2% RH	4 s	2.3V ~ 5.5V	-40°C ~ 125°C	4-UDFN Exposed Pad	3,602	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental regulatory alignment. Selection between the SHT41A-BD1B-R2 and substitute options should be based on inventory availability and application-specific classification requirements. The SHT40A series variants (SHT40A-AD1B-R3, SHT40A-FD1B-R3) offer higher inventory levels (10,774 and 11,019 units respectively), supporting extended lead time requirements. The SHT40I-BD1B-R3 variant is designated for industrial applications but maintains identical electrical and mechanical specifications. Packaging revision levels (R2 vs. R3) do not affect functional performance or PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can SHT40A series parts replace SHT41A series parts in automotive applications? A: Yes. Both series maintain identical electrical specifications, accuracy, response time, and package configuration. The designation difference reflects application classification but does not affect functional interchangeability in designs specified for the SHT41A-BD1B-R2.

Q: What is the difference between R2 and R3 packaging revisions? A: R2 and R3 designations indicate packaging revision levels. Both revisions maintain the same 4-UDFN exposed pad footprint (1.5x1.5mm) and electrical characteristics. PCB layouts designed for either revision are compatible with both.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 rating, meeting the same environmental and moisture sensitivity requirements as the primary part.

Q: Can I use SHT40I-BD1B-R3 in an automotive design specified for SHT41A-BD1B-R2? A: Yes. The SHT40I-BD1B-R3 maintains identical electrical specifications, operating temperature range, supply voltage, and package configuration. The industrial designation does not restrict use in automotive applications where the electrical requirements are met.

Q: What determines substitution eligibility for these parts? A: Substitution is based on matching sensor type, humidity range, I2C output protocol, 16-bit resolution, ±2% RH accuracy, 4-second response time, 2.3V to 5.5V supply voltage, -40°C to 125°C operating temperature, surface-mount configuration, and 4-UDFN exposed pad package. All listed parts meet these criteria.

Q: Are there inventory considerations when selecting a substitute? A: Yes. Inventory levels vary across part numbers. SHT40A-AD1B-R3 (11,019 units) and SHT40A-FD1B-R3 (10,774 units) offer significantly higher stock levels compared to the primary part (3,419 units), which may be relevant for high-volume production or extended delivery schedules.

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