SHT11 Equivalent & Substitute Parts Reference

Part Overview

The SHT11 is a combined humidity and temperature sensor manufactured by Sensirion AG, designed for digital output applications with ±3% RH accuracy across 0–100% RH range. The device operates from 2.4V to 5.5V supply voltage and features an 8-second response time in a 10-SMD surface mount package. The SHT11 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

SHT11

Sensirion AGIn Stock: 4594SHT11 Datasheet

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SHT31-ARP-B

Sensirion AGIn Stock: 3342SHT31-ARP-B Datasheet

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SHT31-DIS-B2.5KS

SensirionIn Stock: 5350SHT31-DIS-B2.5KS Datasheet

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SHT31-DIS-F2.5KS

Sensirion AGIn Stock: 100289SHT31-DIS-F2.5KS Datasheet

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SHT31-DIS-P2.5KS

Sensirion AGIn Stock: 20922SHT31-DIS-P2.5KS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SHT11 is determined by the following critical parameters:

Functional Compatibility:

• Sensor type (humidity and temperature measurement)
• Humidity measurement range (0–100% RH)
• Response time (8 seconds)
• Supply voltage overlap (minimum 2.4V requirement)

Output Interface Compatibility: The SHT11 provides digital output. Substitute parts must support digital communication protocols (I2C) or analog voltage output, depending on circuit design requirements.

Mechanical and Environmental Compatibility:

• Surface mount package type
• Operating temperature range (minimum −40°C to 123°C coverage)
• MSL rating (1 or equivalent)
• RoHS3 compliance

Performance Trade-offs: Substitute parts in the SHT3 series offer improved accuracy (±2% RH versus ±3% RH) and extended upper operating temperature (125°C versus 123°C), with active product status ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

For I2C Digital Interface Applications: SHT31-DIS-B2.5KS, SHT31-DIS-F2.5KS, and SHT31-DIS-P2.5KS are direct functional replacements. All three parts operate within the SHT11 supply voltage range, provide superior ±2% RH accuracy, and maintain 8-second response time. These parts are active products with confirmed long-term availability. Selection among these three variants depends on packaging requirements: Cut Tape (CT) & Digi-Reel for SHT31-DIS-B2.5KS, or Tape & Reel (TR) for SHT31-DIS-F2.5KS and SHT31-DIS-P2.5KS.

For Analog Voltage Output Applications: SHT31-ARP-B provides analog voltage output (26 mV/%RH sensitivity) as an alternative to digital protocols. This part maintains supply voltage compatibility, 8-second response time, and ±2% RH accuracy. The analog output interface requires circuit redesign compared to the SHT11 digital output.

Compliance and Availability: All substitute parts maintain ROHS3 compliance, MSL rating 1, and active product status. The SHT11 obsolete status necessitates migration to SHT3 series parts for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can SHT31 series parts directly replace SHT11 in existing designs? A: Direct replacement depends on output interface compatibility. SHT31-DIS variants (I2C output) require compatible microcontroller interfaces. SHT31-ARP-B (analog output) requires analog-to-digital conversion circuitry. Package size differs (8-DFN versus 10-SMD), requiring PCB layout modification.

Q: What is the accuracy improvement when migrating from SHT11 to SHT31? A: SHT31 series provides ±2% RH accuracy compared to SHT11's ±3% RH, representing a 33% improvement in humidity measurement accuracy.

Q: Are all SHT31 substitute parts compatible with 5V supply voltage? A: Yes. All listed SHT31 variants operate within the 2.4V–5.5V range, maintaining compatibility with 5V supply systems used by SHT11.

Q: What packaging differences exist between SHT11 and SHT31 substitutes? A: SHT11 uses 10-SMD Module (10-LCC supplier package). All SHT31 substitutes use 8-VFDFN Exposed Pad (8-DFN 2.5×2.5 supplier package). PCB footprint redesign is required.

Q: Which SHT31 variant should be selected for high-volume production? A: SHT31-DIS-F2.5KS offers the largest inventory (100,200 pcs) in Tape & Reel packaging, optimized for automated assembly. SHT31-DIS-P2.5KS provides secondary high-volume availability (20,831 pcs) in Tape & Reel format.

Q: Do all substitute parts maintain the 8-second response time? A: Yes. All SHT31 variants listed maintain the 8-second response time specification, ensuring equivalent sensor response characteristics.

Q: What is the operating temperature range difference? A: SHT11 operates to 123°C maximum; SHT31 series extends to 125°C. Both cover the −40°C minimum requirement. The 2°C difference is negligible for most applications.