SHT40A-FD1B-R2 Equivalent & Substitute Parts

Part Overview

The SHT40A-FD1B-R2 is an automotive-grade humidity and temperature sensor manufactured by Sensirion AG. This Surface Mount device operates across 0–100% RH with ±3% 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 when all critical electrical and mechanical parameters match the main part specification, ensuring direct functional equivalence in automotive applications.

Key Parameters

Parameter	Value
Sensor Type	Humidity, Temperature
Humidity Range	0 ~ 100% RH
Output Type	I2C
Output Resolution	16-bit
Accuracy	±3% RH
Response Time	4 s
Supply Voltage	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	4-UDFN Exposed Pad
Supplier Device Package	4-DFN (1.5x1.5)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SHT40A-FD1B-R2 are qualified based on parametric equivalence across all critical specifications. The substitution logic is determined by matching the following parameters:

Sensor Type: Humidity and Temperature dual sensing
Humidity Range: 0–100% RH full-scale measurement
Output Protocol: I2C digital communication
Output Resolution: 16-bit data format
Accuracy: ±3% RH measurement tolerance
Response Time: 4-second sensor response
Supply Voltage Range: 2.3V–5.5V operational window
Operating Temperature: -40°C to 125°C automotive range
Package Footprint: 4-UDFN Exposed Pad (1.5×1.5 mm)
Compliance: RoHS3 and REACH status

All three substitute parts (SHT40A-AD1B-R2, SHT40A-AW1B-R2, SHT40A-AW1B-R3) meet these criteria identically, confirming direct functional and mechanical interchangeability.

Parameter Comparison

Parameter	SHT40A-FD1B-R2	SHT40A-AD1B-R2	SHT40A-AW1B-R2	SHT40A-AW1B-R3
Manufacturer	Sensirion AG	Sensirion AG	Sensirion AG	Sensirion AG
Series	SHT4	SHT4	SHT4	SHT4
Product Status	Active	Active	Active	Active
Sensor Type	Humidity, Temperature	Humidity, Temperature	Humidity, Temperature	Humidity, Temperature
Humidity Range	0 ~ 100% RH	0 ~ 100% RH	0 ~ 100% RH	0 ~ 100% RH
Output Type	I2C	I2C	I2C	I2C
Output Resolution	16-bit	16-bit	16-bit	16-bit
Accuracy	±3% RH	±3% RH	±3% RH	±3% RH
Response Time	4 s	4 s	4 s	4 s
Supply Voltage	2.3V ~ 5.5V	2.3V ~ 5.5V	2.3V ~ 5.5V	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-UDFN Exposed Pad	4-UDFN Exposed Pad	4-UDFN Exposed Pad	4-UDFN Exposed Pad
Supplier Device Package	4-DFN (1.5x1.5)	4-DFN (1.5x1.5)	4-DFN (1.5x1.5)	4-DFN (1.5x1.5)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	3594 Pcs New Original	3038 Pcs New Original	3483 Pcs New Original	10724 Pcs New Original

Engineering Selection Recommendations

All substitute parts maintain identical electrical performance and mechanical compatibility with the SHT40A-FD1B-R2. Selection between the main part and substitutes is based on availability and supply chain considerations rather than technical differentiation.

The SHT40A-AW1B-R3 offers the highest inventory level at 10,724 pieces, providing supply security for high-volume production. The SHT40A-AW1B-R2 and SHT40A-AD1B-R2 provide intermediate inventory options with 3,483 and 3,038 pieces respectively. The main part SHT40A-FD1B-R2 maintains 3,594 pieces in stock.

All parts carry Active product status with full RoHS3 compliance and REACH Unaffected designation, confirming regulatory alignment for automotive applications across all options.

Frequently Asked Questions (FAQ)

Q: Can SHT40A-AD1B-R2, SHT40A-AW1B-R2, and SHT40A-AW1B-R3 be used interchangeably with SHT40A-FD1B-R2?

A: Yes. All four parts share identical electrical specifications (I2C output, 16-bit resolution, ±3% RH accuracy, 4-second response time, 2.3V–5.5V supply range, -40°C to 125°C operating window) and mechanical packaging (4-UDFN Exposed Pad, 1.5×1.5 mm footprint). Direct substitution is supported without circuit modification.

Q: What is the difference between these part numbers?

A: The differences are limited to internal manufacturing process variants (indicated by the suffix letters FD, AD, AW) and tape reel revision levels (R2, R3). These do not affect functional performance, accuracy, or interface characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All four parts carry ROHS3 Compliant status and REACH Unaffected designation, meeting automotive regulatory requirements.

Q: What is the MSL rating for these sensors?

A: All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

Q: Which part should I select based on availability?

A: Selection should be based on supply chain requirements. SHT40A-AW1B-R3 offers the highest inventory (10,724 pieces), while SHT40A-FD1B-R2, SHT40A-AW1B-R2, and SHT40A-AD1B-R2 provide alternative sources with 3,594, 3,483, and 3,038 pieces respectively.

Q: Is the 4-DFN (1.5×1.5) package footprint identical across all parts?

A: Yes. All parts use the same 4-UDFN Exposed Pad package with 1.5×1.5 mm dimensions, ensuring PCB layout compatibility without redesign.

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