MPX4250AP 2.5 Bar MAP Sensor

The MPX4250AP is a precision 2.5 Bar Manifold Absolute Pressure (MAP) sensor ideal for use in naturally aspirated and moderate boost automotive engine management systems. It’s the factory-spec sensor included in the Classic MegaSquirt-2 and MegaSquirt-3 Kit ECUs, providing stable and accurate pressure readings up to 21 PSI of boost.

Engineered by NXP (formerly Freescale), the MPX4250AP offers a fast response time and excellent linearity across a wide operating range. Whether you're building a custom ECU or replacing a damaged sensor, this component delivers reliable performance for fuel mapping, ignition control, and barometric correction.

Key Features:

• Pressure Range: 20 kPa to 250 kPa absolute
  – Equivalent to 2.9 PSI to 36.3 PSI absolute
  – Supports up to ~21 PSI of boost (above atmospheric)

• Supply Voltage: 5V ±0.25V

• Output Voltage Range: 0.2V to 4.9V (typical)

• Accuracy: ±1.5% typical at 25°C

• Response Time: <1 ms

• Temperature Range: -40°C to +125°C

• Package: Small Outline Package (SOP)

• Port Style: Top-mounted vacuum port fits 3/16” ID hose

Applications:

• MegaSquirt-2 and MegaSquirt-3 Classic ECU Kits

• Naturally aspirated engines

• Turbocharged and supercharged setups up to 21 PSI boost

• Custom EFI projects requiring a reliable 2.5 bar MAP signal