SHT40I-BD1B-R3 Equivalent & Substitute Parts

Part Overview

The SHT40I-BD1B-R3 is an industrial-grade humidity and temperature sensor manufactured by Sensirion AG. This surface-mount component operates across 0–100% RH with ±2% RH accuracy and 4-second response time, communicating via I2C protocol. The part is Active in product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and environmental operating ranges to ensure direct functional equivalence in industrial applications.

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 s
Supply Voltage	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package	4-UDFN Exposed Pad (4-DFN 1.5x1.5)
RoHS Status	RoHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SHT40I-BD1B-R3 are qualified based on the following criteria:

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

Mechanical Compatibility: All substitutes use the same package type (4-UDFN Exposed Pad with 4-DFN 1.5×1.5 dimensions) and mounting method (Surface Mount), ensuring PCB layout compatibility without redesign.

Environmental Specifications: Operating temperature range (-40°C to 125°C), RoHS3 compliance, MSL 1 rating, and REACH unaffected status are consistent across all parts.

Series Consistency: All parts belong to the SHT4 series from Sensirion AG with Active product status.

The substitutes differ only in application designation (Industrial vs. Automotive) and tape reel revision levels, which do not affect electrical or mechanical function.

Parameter Comparison

Part Number	Manufacturer	Series	Sensor Type	Humidity Range	Output Type	Accuracy	Response Time	Supply Voltage	Operating Temp	Package	Mounting	RoHS Status	MSL	Inventory (Pcs)
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	Surface Mount	RoHS3 Compliant	1	10,284
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	Surface Mount	RoHS3 Compliant	1	11,019
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	Surface Mount	RoHS3 Compliant	1	10,774
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	Surface Mount	RoHS3 Compliant	1	3,164
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	Surface Mount	RoHS3 Compliant	1	9,277
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	Surface Mount	RoHS3 Compliant	1	3,419
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	Surface Mount	RoHS3 Compliant	1	8,657
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	Surface Mount	RoHS3 Compliant	1	3,602

Engineering Selection Recommendations

All substitute parts maintain full electrical and mechanical equivalence to the SHT40I-BD1B-R3. Selection among substitutes should be based on:

Product Availability: Inventory levels vary across part numbers. SHT40A-AD1B-R3 (11,019 pcs) and SHT40A-FD1B-R3 (10,774 pcs) offer highest stock levels. SHT41A-AW1B-R2 (3,164 pcs) and SHT41A-FD1B-R2 (3,602 pcs) have lower availability.

Compliance Status: All parts are RoHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification with identical HTSUS code 8542.39.0001.

Application Designation: The SHT40A series carries automotive qualification, while SHT40I and SHT41A variants are designated for industrial and automotive applications respectively. This designation does not alter electrical performance or environmental specifications.

Tape Reel Revision: R2 and R3 revisions indicate different tape reel packaging generations. Both are functionally equivalent; selection depends on supply chain and procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can SHT40A-AD1B-R3 replace SHT40I-BD1B-R3 directly on the PCB?

A: Yes. Both parts use identical 4-UDFN Exposed Pad packages (4-DFN 1.5×1.5) with surface-mount compatibility. No PCB layout changes are required.

Q: Are there electrical differences between SHT40I and SHT40A variants?

A: No. Both variants maintain identical sensor specifications: 0–100% RH range, ±2% RH accuracy, 4-second response time, I2C output, 16-bit resolution, and 2.3V–5.5V supply voltage. The designation difference reflects application qualification only.

Q: What is the difference between R2 and R3 tape reel revisions?

A: R2 and R3 indicate different generations of tape reel packaging used during manufacturing. Both revisions are electrically and mechanically identical. Selection is based on supply chain availability and procurement specifications.

Q: Do all substitute parts operate across the same temperature range?

A: Yes. All parts operate from -40°C to 125°C with identical RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating.

Q: Which substitute part has the highest inventory availability?

A: SHT40A-AD1B-R3 with 11,019 pieces in stock, followed by SHT40A-FD1B-R3 with 10,774 pieces.

Q: Are there any compliance or certification differences between substitute parts?

A: No. All parts share identical RoHS3 compliance, REACH unaffected status, EAR99 ECCN classification, and HTSUS code 8542.39.0001.

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