Precision Under Pressure: Introducing the PSA071040 MEMS Pressure Sensor

At PUI Audio, we’ve built a reputation on delivering components that work hard, last long, and integrate easily. While we’re widely known for our audio and haptic solutions, our expanding lineup of MEMS technology reflects a broader commitment to solving problems across industries. One such example is the PSA071040—a high-performance MEMS pressure sensor designed for compact integration and consistent precision.

This article covers the key features and design advantages of the PSA071040 sensor. In a follow-up, we’ll explore specific use cases across medical, consumer, and industrial applications.

What It Is: A MEMS Pressure Sensor That Works Like a Strain Gauge—Only Smaller

The PSA071040 is a MEMS (Micro-Electro-Mechanical Systems) pressure transducer. Internally, it uses a piezoresistive Wheatstone bridge mounted on an elastic film. In plain terms: when air pressure changes, the elastic material flexes slightly, causing the resistors in the bridge to change their electrical resistance. This change in resistance produces a voltage that’s directly proportional to the amount of pressure applied—positive or negative.

This voltage is the signal output of the sensor, and it tells your circuit how much pressure is being applied.

Core Specs and Electrical Performance

Here’s what you need to know at a glance:

Signal Behavior: Understanding Output in Simple Terms

The PSA071040 outputs a differential voltage—meaning it has two signal lines. The difference between these lines represents the pressure value. If positive pressure is applied, the positive output is higher than the negative. If negative pressure (i.e., vacuum) is applied, that polarity flips.

This design improves signal accuracy and reduces the impact of electrical noise. It’s also the reason why the sensor can report both positive and negative pressure values even though it runs on a single power supply.

For users designing systems that need amplified output, the sensor pairs well with instrumentation amplifiers like the AD620, as described in the application circuit section of the datasheet.

Integration and Layout Considerations

This sensor is built for SMD (Surface Mount Device) integration, but its small thermal mass requires a gentle touch during assembly. Key guidelines:

• Avoid overheating: Excessive reflow temperatures can deform the internal structures and affect sensitivity.
• Protect the port: The sensor port leads directly to the sensing element. Dust, debris, or cleaning fluids can cause permanent damage. A protective membrane is strongly recommended during handling and assembly.
• No-clean flux only: Post-reflow cleaning is not recommended; use no-clean solder paste to avoid damaging internal elements.
• ESD Safe Handling: Standard ESD precautions apply—use grounded workstations and anti-static packaging when storing or assembling.

A Note on Packaging

Each PSA071040 sensor ships in anti-static tubes with a capacity of 70 units per tube. Bulk shipments contain 32 tubes (2240 units) per anti-static bag, to ensure full ESD protection during transit and storage.

What Comes Next

This article focused on the internal architecture and electrical behavior of the PSA071040. In our next article, we’ll detail real-world applications—from blood pressure monitors and oxygen concentrators to tire gauges and coffee machines—and explain why this sensor stands out in terms of stability, sensitivity, and design flexibility.

For full technical documentation, including performance graphs, pinout diagrams, and recommended circuit examples, refer to the official datasheet.

And as always, if your design requires something custom, our engineering team is ready to collaborate.