NXP Semiconductors MPX4105A

Overview

MPX4105A from Freescale Semiconductor is a monolithic, signal-conditioned silicon pressure sensor designed for manifold absolute pressure (MAP) sensing in automotive engine control systems. It delivers a ratiometric 0.3–4.9 V analog output over a 15–105 kPa range, with ±1.8% full-scale error from 0° to 85°C, temperature compensation from –40° to +125°C, and integrated thin-film resistor networks for high-output stability in intake manifold monitoring.

For engineers reviewing the MPX4105A datasheet, MPX4105A pinout, MPX4105A application, or MPX4105A equivalent, this sensor is selected for precision absolute pressure measurement where ratiometric operation, epoxy unibody robustness, and direct microcontroller interface without external conditioning are critical design requirements.

Technical Context

The MPX4105A integrates a piezoresistive transducer element with on-chip bipolar op amp circuitry, thin-film metallization, and dual-stage gain/compensation stages - enabling fully conditioned analog output without external signal conditioning. Its sealed vacuum reference ensures true absolute pressure measurement, and its ratiometric transfer function (V_OUT = V_S × (0.01 × P − 0.09)) maintains proportionality to supply voltage across 4.85–5.35 V.

Designed specifically for engine intake manifolds, the device uses fluorosilicone gel encapsulation to isolate die and wire bonds while transmitting pressure, and operates reliably with dry air as the pressure medium. Pin configuration follows Case 867-08 unibody package with three active terminals (V_OUT, GND, V_CC) and three no-connect pins.

Key Specifications

Pinout & Package

MPX4105A is housed in a durable epoxy unibody package (Case 867-08), featuring a stainless steel cap and fluorosilicone gel die coat for environmental protection and pressure transmission. Dimensions: 16.00 × 13.56 × 5.59 mm (max), with 6-pin lead frame and positive pressure port (P1) referenced to sealed vacuum (P2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar absolute pressure sensing applications.

Compared with MPX4105A, MPX5105 offers improved ESD robustness and tighter initial accuracy but identical form/fit/function for most ECUs; SP12 provides extended pressure/temperature capability at the cost of pinout change and non-ratiometric interface - requiring firmware and hardware revision.

Availability

MPX4105A is available at Aetrix Electronics and suitable for automotive engine control units, throttle response monitoring systems, and idle speed control applications requiring stable component supply and long-term calibration consistency.

Supply support for MPX4105A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor was a leading designer of embedded processors, analog, and sensor ICs, later acquired by NXP Semiconductors in 2015. Its pressure sensor portfolio emphasized automotive-grade reliability and system-level integration.

The MPX4105A belongs to Freescale's MAP sensor product line, engineered specifically for cost-sensitive, high-volume engine management systems requiring factory-calibrated absolute pressure measurement with minimal external components.

FAQ

What is the pressure media compatibility of the MPX4105A?

The MPX4105A is qualified for use with dry air as the pressure medium. Its fluorosilicone gel encapsulation and sealed vacuum reference are optimized for this gas. Exposure to liquids, oils, or corrosive gases may degrade long-term performance or cause permanent damage. For alternative media compatibility, consult NXP's application engineering team - the MPX4105A datasheet explicitly states that non-dry-air media require factory validation before deployment.

Does the MPX4105A require external decoupling capacitors?

Yes, the MPX4105A requires external decoupling: a 1.0 μF bulk capacitor and a 0.01 μF ceramic capacitor between V_CC and GND, plus a 470 pF filter capacitor on the V_OUT line, as shown in Figure 3 of the MPX4105A datasheet. These components suppress supply noise and reduce high-frequency output ripple, ensuring the ±1.8% VFSS accuracy is maintained - skipping them risks violating electrical specifications.

Can the MPX4105A be used outside the automotive sector?

Yes, the MPX4105A is used in non-automotive applications including HVAC airflow monitoring, medical ventilator pressure feedback, and industrial vacuum control - provided the 15–105 kPa absolute range, –40 to +125°C operating temperature, and dry air compatibility align with system requirements. Its ratiometric output and onboard temperature compensation simplify integration into microcontroller-based systems beyond engine control.

What is the meaning of "Unibody Package" in the MPX4105A ordering context?

"Unibody Package" refers to the MPX4105A's integrated epoxy housing (Case 867-08), where the pressure-sensing die, lead frame, stainless steel cap, and fluorosilicone gel are assembled as a single mechanically robust unit. This construction eliminates gaskets or secondary seals, improves resistance to vibration and thermal cycling, and ensures consistent pressure transmission - distinguishing it from modular or multi-part sensor assemblies.

How does the MPX4105A handle temperature variation across its full operating range?

The MPX4105A incorporates on-chip thin-film resistor networks and bipolar op amp circuitry to provide active temperature compensation from –40° to +125°C. While full accuracy (±1.8% VFSS) is specified only from 0° to 85°C, the device remains functional and stable across its full range - with offset stability tested to ±0.65% VFSS after 1000-hour stress. The transfer function includes documented temperature multipliers for error band correction in extreme conditions.