NXP Semiconductors MPX5999D

Overview

MPX5999D from Freescale Semiconductor is a fully integrated, on-chip signal-conditioned, temperature-compensated and factory-calibrated piezoresistive differential/gauge pressure sensor with 0–1000 kPa range, 0.2–4.7 V ratiometric analog output, ±2.5% VFSS accuracy over 0–85°C, and 1 ms response time-designed for microcontroller-based engine manifold or HVAC differential pressure monitoring.

For engineers reviewing the MPX5999D datasheet, MPX5999D pinout, MPX5999D application, or MPX5999D equivalent, key selection considerations include its unibody epoxy package (Case 867), dry-air media qualification, 5 V supply operation, and direct A/D interface capability without external amplification.

Technical Context

The MPX5999D integrates a patented silicon shear-stress strain gauge, thin-film metallization, and bipolar signal conditioning circuitry-including two-stage gain, temperature compensation, and ground reference shift-onto a single monolithic die. It operates ratiometrically with 4.75–5.25 V supply and delivers a linear voltage output defined by Vout = VS × (0.000901 × P + 0.04) ± error.

Its internal architecture eliminates need for external compensation components: on-chip temperature compensation covers 0–85°C, zero offset and full-scale span are factory-trimmed, and decoupling (1.0 µF + 0.01 µF + 470 pF) is specified for stable A/D interfacing. Pins 4–6 are no-connects; only VCC, VOUT, and GND are functional terminals.

Key Specifications

Pinout & Package

MPX5999D uses Freescale Case 867: unibody epoxy package with stainless steel cap (P1 side), fluorosilicone gel isolation, and 6-pin SIP configuration. Dimensions: 16.00 × 13.56 × 5.59 mm (max).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPX5999D, MPX5700DP offers improved accuracy at lower pressure range, while MPX5050DP maintains identical form-factor and compensation but trades 1000 kPa headroom for marginally wider zero-to-full output swing-both require no PCB changes but differ in calibrated range and output scaling.

Availability

MPX5999D is available at Aetrix Electronics and suitable for engine management systems, HVAC filter monitoring, industrial compressed air diagnostics, and medical nebulizer flow control requiring stable component supply across automotive Tier-2, building automation, and portable medical device programs.

Supply support for MPX5999D 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 (now part of NXP Semiconductors) was a U.S.-based semiconductor company specializing in embedded processing, sensors, and analog ICs for automotive, industrial, and consumer markets.

The MPX5999D belongs to Freescale's MPX-series monolithic silicon pressure sensors-designed specifically for high-reliability, low-drift, microcontroller-direct interfacing in harsh-environment pressure measurement applications.

FAQ

What pressure media is qualified for use with the MPX5999D?

The MPX5999D operating characteristics and reliability testing are explicitly based on dry air as the pressure media. Use of other media-including moisture, oil, or corrosive gases-may degrade long-term performance or cause irreversible damage. Freescale recommends contacting factory engineering before qualifying alternate media, as compatibility depends on chemical interaction with fluorosilicone gel and stainless steel cap.

Does the MPX5999D require external signal conditioning to interface with a microcontroller ADC?

No, the MPX5999D does not require external signal conditioning. Its on-chip circuitry provides full signal conditioning-including temperature compensation, gain staging, and offset trimming-delivering a ready-to-use 0.2–4.7 V analog output. Only recommended power supply decoupling (1.0 µF + 0.01 µF + 470 pF) is needed per Figure 4 to meet electrical specifications when interfacing with an MCU ADC.

What is the meaning of "ratiometric" output in the MPX5999D datasheet?

The MPX5999D output is ratiometric: its full-scale voltage scales linearly with supply voltage (VS). For example, at VS = 5.0 V, full-scale output is ~4.7 V; at VS = 4.9 V, it becomes ~4.61 V. This preserves measurement accuracy even with supply rail variation, as long as the ADC reference is tied to the same VS-enabling robust operation in electrically noisy environments without precision voltage regulation.

Can pins 4, 5, and 6 of the MPX5999D be used for grounding or signal routing?

No-pins 4, 5, and 6 of the MPX5999D are internally no-connect (N/C) terminals. The datasheet explicitly states they must remain unconnected on the PCB. Soldering, tracing, or tying them to ground, supply, or any other node may compromise sensor performance or reliability. Only pins 1 (VCC), 2 (VOUT), and 3 (GND) are functional; all others must be left floating.

Is the MPX5999D suitable for absolute pressure measurement?

The MPX5999D is configured as a differential or gauge pressure sensor-not absolute. Its design assumes P1 > P2, with P2 referenced to ambient (gauge) or a second port (differential). It lacks a sealed vacuum reference cavity required for absolute measurement. For absolute pressure applications, consider Freescale's MPX5100AP or MPX5500DP series, which integrate internal vacuum references and specify absolute pressure ranges.