SHT41A-BD1B-R3 Equivalent & Substitute Parts

Part Overview

The SHT41A-BD1B-R3 is an automotive-grade humidity and temperature sensor manufactured by Sensirion AG, part of the SHT4 series. This surface-mount sensor operates across 0–100% RH with ±2% RH accuracy and 4-second response time, utilizing I2C digital output. The part is Active status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and automotive or industrial qualification within the SHT4 product family.

Key Parameters

Parameter	Value
Manufacturer	Sensirion AG
Series	SHT4
Sensor Type	Humidity, Temperature
Humidity Range	0 – 100% RH
Accuracy	±2% RH
Output Type	I2C
Output Resolution	16-bit
Response Time	4 s
Supply Voltage	2.3V – 5.5V
Operating Temperature	–40°C – 125°C
Mounting Type	Surface Mount
Package	4-UDFN Exposed Pad (4-DFN 1.5×1.5 mm)
Packaging Format	Tape & Reel (TR)
RoHS Status	RoHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SHT41A-BD1B-R3 are qualified based on the following criteria:

Electrical Equivalence: All substitute parts maintain identical humidity range (0–100% RH), accuracy (±2% RH), output type (I2C), resolution (16-bit), response time (4 s), and supply voltage range (2.3V–5.5V).

Thermal Compatibility: All substitutes operate across the same temperature range (–40°C – 125°C), ensuring functional equivalence in automotive and industrial environments.

Mechanical Compatibility: All parts use identical surface-mount packaging (4-UDFN Exposed Pad, 4-DFN 1.5×1.5 mm) and Tape & Reel format, allowing direct PCB layout compatibility.

Compliance & Certification: All substitutes maintain RoHS3 compliance, MSL 1 rating, and Active product status.

Qualification Variants: Substitutes include automotive-grade (SHT41A, SHT40A) and industrial-grade (SHT40I) variants. The primary difference lies in application qualification and internal calibration tuning, not electrical or mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Humidity Range	Accuracy	Output Type	Supply Voltage	Operating Temp	Package	Qualification	Inventory (Pcs)
SHT41A-BD1B-R3	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	8,657
SHT40A-AD1B-R3	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	11,019
SHT40A-FD1B-R3	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	10,774
SHT40I-BD1B-R3	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Industrial	10,284
SHT41A-AW1B-R2	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	3,164
SHT41A-AW1B-R3	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	9,277
SHT41A-BD1B-R2	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	3,419
SHT41A-FD1B-R2	Sensirion AG	0–100% RH	±2% RH	I2C	2.3V–5.5V	–40°C–125°C	4-UDFN (1.5×1.5)	Automotive	3,602

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical equivalence to the SHT41A-BD1B-R3. Selection among substitutes should be based on:

Application Qualification: Automotive-grade parts (SHT41A, SHT40A series) are suitable for automotive environments. Industrial-grade parts (SHT40I series) are qualified for industrial applications. Confirm application requirements before selection.

Availability: SHT40A-AD1B-R3 (11,019 Pcs) and SHT40A-FD1B-R3 (10,774 Pcs) offer highest inventory levels. SHT41A-AW1B-R2 (3,164 Pcs) and SHT41A-BD1B-R2 (3,419 Pcs) have lower stock.

Compliance Assurance: All parts carry RoHS3 compliance and REACH Unaffected status, meeting regulatory requirements for automotive and industrial applications.

Package Consistency: All substitutes use identical 4-UDFN Exposed Pad packaging in Tape & Reel format, ensuring direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can SHT40A and SHT41A series parts be used interchangeably? A: Yes. Both series maintain identical electrical specifications (humidity range, accuracy, I2C output, supply voltage, operating temperature) and mechanical packaging (4-UDFN 1.5×1.5 mm). The primary difference is internal calibration tuning and application qualification. Confirm your application's qualification requirements before substitution.

Q: What is the difference between automotive-grade (SHT40A, SHT41A) and industrial-grade (SHT40I) parts? A: All parts meet identical electrical and thermal specifications. The distinction lies in application qualification and internal calibration. Automotive-grade parts are qualified for automotive environments; industrial-grade parts are qualified for industrial environments. Select based on your application's certification requirements.

Q: Are R2 and R3 variants electrically equivalent? A: Yes. R2 and R3 designations indicate different tape reel configurations or manufacturing revisions, not electrical differences. All R2 and R3 variants maintain identical sensor specifications, accuracy, and performance characteristics.

Q: Can I substitute SHT40I-BD1B-R3 (industrial-grade) in an automotive application? A: Electrical and mechanical specifications are identical. However, confirm that your automotive application accepts industrial-grade qualification. If automotive certification is mandatory, use automotive-grade variants (SHT40A or SHT41A series).

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting regulatory requirements for automotive and industrial applications.

Q: What is the package compatibility between all listed parts? A: All parts use 4-UDFN Exposed Pad packaging (4-DFN 1.5×1.5 mm) in Tape & Reel format. PCB footprints and land patterns are identical, allowing direct substitution without layout modifications.

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