SHT41A-FD1B-R2 Equivalent & Substitute Parts

Part Overview

The SHT41A-FD1B-R2 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 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 levels within the SHT4 product family.

Key Parameters

Parameter	Value
Manufacturer	Sensirion AG
Series	SHT4
Sensor Type	Humidity, Temperature
Humidity Range	0 – 100% RH
Output Type	I2C
Output Resolution	16-bit
Accuracy	±2% RH
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)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the SHT41A-FD1B-R2 is determined by the following criteria:

Primary Matching Parameters:

Humidity and temperature sensor functionality
I2C digital output interface
16-bit output resolution
±2% RH accuracy specification
4-second response time
2.3V–5.5V supply voltage range
–40°C–125°C operating temperature range
4-UDFN Exposed Pad package (4-DFN 1.5×1.5 mm)
Surface-mount configuration
Tape & Reel packaging format
ROHS3 compliance
MSL 1 rating

Qualification Level Variants: The SHT4 series includes automotive-grade (SHT41A, SHT40A) and industrial-grade (SHT40I) variants. Automotive-grade parts are interchangeable with other automotive-grade parts. Industrial-grade parts (SHT40I-BD1B-R3) share identical electrical and mechanical specifications but carry industrial qualification.

Revision Designations: Parts designated with R2 or R3 suffixes represent different manufacturing revisions. Both revisions meet the same electrical and mechanical specifications and are functionally equivalent.

Parameter Comparison

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

Engineering Selection Recommendations

All listed substitute parts maintain identical electrical performance, mechanical compatibility, and regulatory compliance with the SHT41A-FD1B-R2. Selection among equivalents should be based on:

Qualification Level: Automotive-grade parts (SHT41A, SHT40A) are suitable for automotive applications. Industrial-grade parts (SHT40I) meet industrial specifications and carry industrial qualification. Application requirements determine appropriate qualification selection.

Manufacturing Revision: R2 and R3 designations indicate manufacturing revisions. Both revisions satisfy the same electrical and mechanical specifications and are functionally interchangeable.

Availability: Inventory levels vary across part numbers. SHT40A-AD1B-R3 (11,019 pcs), SHT40A-FD1B-R3 (10,774 pcs), and SHT41A-BD1B-R3 (8,657 pcs) offer higher stock availability compared to the primary part.

Regulatory Compliance: All parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating, meeting standard industrial and automotive regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SHT40A and SHT41A parts be used interchangeably? A: Yes. Both SHT40A and SHT41A automotive-grade variants share identical electrical specifications, accuracy, response time, supply voltage, operating temperature range, and package configuration. They are functionally equivalent for applications requiring automotive qualification.

Q: What is the difference between R2 and R3 manufacturing revisions? A: R2 and R3 designations represent different manufacturing revisions of the same part. Both revisions meet identical electrical and mechanical specifications and are functionally interchangeable. Selection between revisions is based on availability and supply chain requirements.

Q: Can industrial-grade SHT40I-BD1B-R3 replace automotive-grade SHT41A-FD1B-R2? A: Industrial-grade and automotive-grade parts share identical electrical and mechanical specifications. However, qualification level selection depends on application requirements. Automotive applications requiring automotive qualification should use automotive-grade parts. Industrial applications may use industrial-grade parts.

Q: Are all substitute parts available in the same package format? A: Yes. All listed substitute parts use 4-UDFN Exposed Pad packaging (4-DFN 1.5×1.5 mm) in Tape & Reel format, ensuring mechanical and assembly compatibility.

Q: Do all substitute parts operate across the same temperature and voltage ranges? A: Yes. All substitute parts operate across –40°C–125°C and accept 2.3V–5.5V supply voltage, matching the primary part specification.

Q: What determines substitution eligibility for SHT4 series sensors? A: Substitution is based on matching humidity and temperature sensing capability, I2C digital output, 16-bit resolution, ±2% RH accuracy, 4-second response time, identical supply voltage and operating temperature ranges, 4-UDFN package format, and regulatory compliance (ROHS3, MSL 1).

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