ASP1400 Equivalent & Substitute Parts

Part Overview

The ASP1400 is a differential pressure sensor manufactured by Sensirion AG, designed for board mount applications with a measurement range of ±0.02PSI (±0.1kPa). The sensor features dual 15.2-bit output via RS-232 interface and operates across a temperature range of 0°C to 70°C. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations. The ASP1400 remains in stock with 58,200 units available as new original inventory.

Substiute Parts

ASP1400

Sensirion AGIn Stock: 58299ASP1400 Datasheet

Current PartRFQ

SDP810-125PA

Sensirion AGIn Stock: 1385SDP810-125PA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASP1400 is determined by the following critical parameters:

Pressure measurement capability (operating pressure range and maximum pressure rating) must remain within acceptable tolerance for the application. The ASP1400 operates at ±0.02PSI with a maximum of ±21.76PSI.

Output interface compatibility is a primary constraint. The ASP1400 uses RS-232 serial communication with 15.2-bit resolution.

Mechanical compatibility includes port size, port style (barbed configuration), and connector type (male dual tube).

Electrical compatibility encompasses supply voltage range (7V ~ 18V) and power consumption characteristics.

Environmental operating conditions include temperature range (0°C ~ 70°C) and temperature compensation features.

The SDP810-125PA is identified as a manufacturer-recommended substitute. This substitution is valid when the application can accommodate differences in output interface (I2C instead of RS-232), output resolution (16-bit instead of 15.2-bit), operating pressure range (±0.018PSI instead of ±0.02PSI), supply voltage (3V ~ 5.5V instead of 7V ~ 18V), port size (0.2" instead of 0.24"), and operating temperature range (-20°C ~ 85°C instead of 0°C ~ 70°C).

Parameter Comparison

Engineering Selection Recommendations

The SDP810-125PA is the manufacturer-recommended substitute for the obsolete ASP1400. This substitution is appropriate for applications where the following conditions are met:

The system design can accommodate I2C serial communication in place of RS-232. This requires modification to the host controller firmware and communication protocol implementation.

The power supply can be redesigned to provide 3V to 5.5V instead of 7V to 18V.

The pneumatic tubing can be adapted from 0.24" (6mm) to 0.2" (5.2mm) diameter, or appropriate tubing adapters are available.

The application pressure range requirement does not exceed ±0.018PSI (±0.125kPa) operating range or 14.5PSI (100kPa) maximum pressure.

The measurement accuracy requirement can tolerate ±3% instead of ±1.5%.

The operating temperature range of -20°C to 85°C is acceptable for the application.

Both components are ROHS3 compliant and REACH unaffected, ensuring regulatory compliance for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the SDP810-125PA be used as a direct drop-in replacement for the ASP1400?

A: No. While both are differential pressure sensors from Sensirion AG with identical port styles and temperature compensation features, they differ in output interface (I2C vs. RS-232), supply voltage (3V-5.5V vs. 7V-18V), port size (0.2" vs. 0.24"), and pressure range specifications. System-level modifications are required.

Q: What are the primary differences in electrical interface?

A: The ASP1400 uses RS-232 serial communication with 15.2-bit output resolution. The SDP810-125PA uses I2C communication with 16-bit output resolution. Host controller firmware must be modified to support the different communication protocol.

Q: Are there pressure range limitations with the SDP810-125PA?

A: Yes. The SDP810-125PA has an operating pressure range of ±0.018PSI (±0.125kPa) and maximum pressure rating of 14.5PSI (100kPa), compared to the ASP1400's ±0.02PSI operating range and ±21.76PSI maximum. Verify that your application pressure requirements fall within these limits.

Q: What mechanical modifications are needed for the port connection?

A: The ASP1400 uses 0.24" (6mm) barbed male tube connectors, while the SDP810-125PA uses 0.2" (5.2mm) barbed male tube connectors. Tubing adapters or new tubing with appropriate sizing must be sourced and integrated into the pneumatic system.

Q: Is the SDP810-125PA suitable for applications requiring ±1.5% accuracy?

A: No. The SDP810-125PA specifies ±3% accuracy, which is less precise than the ASP1400's ±1.5% accuracy. Applications with strict accuracy requirements may require alternative solutions or acceptance of reduced measurement precision.

Q: What is the supply voltage difference, and what does this mean for system design?

A: The ASP1400 requires 7V to 18V supply, while the SDP810-125PA requires 3V to 5.5V. This necessitates a complete redesign of the power supply circuit and voltage regulation for the sensor module.

Q: Are both components compliant with current regulatory standards?

A: Yes. Both the ASP1400 and SDP810-125PA are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: Why is the ASP1400 obsolete if the SDP810-125PA is available?

A: The ASP1400 has been discontinued by Sensirion AG in favor of the SDP810-125PA, which offers improved resolution (16-bit vs. 15.2-bit), wider operating temperature range (-20°C to 85°C vs. 0°C to 70°C), and lower supply voltage requirements. The SDP810-125PA represents the current generation of Sensirion differential pressure sensors in this category.