MPX12DP - 10kPa Differential Pressure Sensor 4-SIP | NXP
料号： MPX12DP ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.75 | $9,750.00 |
MPX12DP 概述
A piezoresistive pressure sensor is a MEMS device in which four silicon strain gauges arranged in a Wheatstone bridge are etched into a monolithic silicon diaphragm. When differential pressure deflects the diaphragm, the gauges change resistance and the bridge produces a millivolt-level differential output. Uncompensated sensors like the MPX12 family intentionally omit on-chip calibration, op-amps, and temperature compensation, allowing OEMs to add their own external signal conditioning and temperature-compensation networks at the lowest possible cost.
Key features include a 5.5 mV/kPa typical sensitivity, ±5% linearity, 35 mV typical full-scale span, and a 0 to 55 mV output span over a 0 to 3V excitation range. The 4-SIP module mounts vertically on a PCB and accepts two external 4.93 mm tubes for inlet and outlet flow or pressure references. The device operates from -40C to +125C and requires only a stable DC excitation source, a low-offset instrumentation amplifier (typically 2 to 35 gain), and a small calibration EEPROM in the customer signal chain.
The MPX12DP silicon die uses bulk micromachined piezoresistors with laser-trimmed bridge resistors for tight span tolerance. Because the raw output is small (millivolts), design attention must focus on low-noise PCB layout, guarding of high-impedance nodes, and a precision low-drift front-end amplifier such as the INA333 or MCP3300D to extract a useful 0 to 5V or 4 to 20 mA industrial signal. Differential sensing makes the part suitable for measuring flow across an orifice, filter pressure drop, or tank-level hydrostatic pressure referenced to atmosphere.
Typical applications include HVAC variable-air-volume (VAV) box flow sensing, medical respirators and CPAP blowers, industrial process control differential flow meters, filter saturation detection, and low-pressure laboratory instrumentation. The differential port configuration allows both sides of the sensor to see positive pressure, with the output representing the difference. Through-hole Mounting and a standard 4-SIP footprint simplify hand-soldered prototyping and rugged field installations.
Designers should select an instrumentation amplifier with input bias current below 1 nA and a CMRR above 80 dB to preserve the bridge linearity. Place the INA as close as possible to the sensor pins to minimize leakage and thermocouple-induced offsets at the millivolt signal level.
This page synthesizes distributor pricing, drop-in alternatives within the MPX12 family, and practical signal-conditioning guidance not found in the bare manufacturer datasheet.
直接替换替代料： MPX12DP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MPX12DP （相同外形与封装尺寸） ——差异在于 Output Type, Compensation, Mounting Type, Operating Temperature, Port Style.
快速对比工具——选择替代料号进行并排对比：
MPX12D
✅ 直接替换✓ 有现货
$4.75 / 个
查看数据手册 →MPX12GP
✅ 直接替换✓ 有现货
$10.5 / 个
查看数据手册 →MPX12AP
✅ 直接替换📋 参考替代料（不在目录中）
MPX12GP6U
✅ 直接替换📋 参考替代料（不在目录中）
MPXV6250GC6U
✅ 直接替换📋 参考替代料（不在目录中）
MPX12DP 最大额定值与电气特性
| Pressure Type | Differential |
| Operating Pressure Range | 0 kPa to 10 kPa (0 PSI to 1.45 PSI) |
| Sensitivity | 5.5 mV/kPa typical |
| Full-Scale Span | 35 mV typical (20 mV min / 75 mV max) |
| 输出电压范围 | 0 mV to 55 mV at 3 V excitation |
| Excitation Voltage | 3 V DC typical |
| Linearity | +/-5% of span |
| Pressure Port Style | Dual axial tube, 4.93 mm (0.19 in) diameter |
| Compensation | Uncompensated (external required) |
| 输出类型 | Analog Wheatstone bridge (mV) |
| Package / Mounting | 4-SIP through-hole module |
| 工作温度 | -40C to +125C |
| 安装类型 | Through Hole |
| MSL 等级 | Not applicable (through-hole) |
MPX12DP 引脚配置
| 引脚 1 | Vout+ — Bridge positive output (millivolts differential signal) |
| 引脚 2 | GND — Bridge ground reference for excitation and signal |
| 引脚 3 | VS — Bridge excitation supply, typically 3.0 V DC |
| 引脚 4 | Vout- — Bridge negative output (millivolts differential signal) |
典型应用
MPX12DP 适用于 7 应用s: HVAC Variable Air Volume (VAV) Box Flow Sensing, Medical Respirator and CPAP Blower Monitoring, Industrial Filter Saturation Detection, Low-Pressure Process Control Flow Meter, Tank Level Hydrostatic Pressure Sensing, Laboratory and Analytical Instrumentation, Portable Handheld Pressure Calibrator.
HVAC Variable Air Volume (VAV) Box Flow Sensing
The MPX12DP's 0 to 10 kPa differential range matches the typical pressure drop across a VAV-box orifice plate at low to medium airflows, and its uncompensated bridge output is amplified by an external instrumentation amp to drive a 0-10 V actuator signal. Using differential sensing eliminates barometric drift that would otherwise corrupt gauge readings in tall-building supply ducts, and the 5.5 mV/kPa sensitivity provides adequate resolution down to 0.05 kPa for closed-loop damper control.
推荐
Medical Respirator and CPAP Blower Monitoring
In medical ventilators the MPX12DP senses the differential pressure across the blower inlet or patient circuit to estimate flow and tidal volume. The 35 mV typical full-scale span at 3 V excitation is sufficient for a 24-bit ADC front-end, and the -40C to +125C operating range supports autoclave-tolerant or warm-airflow circuit paths. Designers add an external NTC and polynomial firmware calibration to meet the +/-1 cmH2O accuracy required by IEC 60601-2 ventilation standards.
推荐
Industrial Filter Saturation Detection
The MPX12DP is mounted across HVAC or process-air filters to monitor the rising pressure differential as the filter loads with particulates. A differential span of 10 kPa covers most clean-room HEPA and bag-filter change-out thresholds, and the mV-level output feeds an op-amp comparator that trips a maintenance alarm. The 4-SIP axial-port package simplifies tubing routing to upstream and downstream tap points on the filter housing without custom manifold machining.
推荐
Low-Pressure Process Control Flow Meter
For low-flow gas or liquid metering the MPX12DP is paired with a laminar flow element or orifice plate to convert differential pressure into volumetric flow via the Bernoulli equation. The uncompensated output is amplified and digitized, then linearized in firmware; the 5.5 mV/kPa sensitivity supports flow rates from 0.01 SLPM to several SLPM in laboratory and pilot-plant installations. The 0.19" tube ports accept 4.93 mm flexible tubing for quick field replacement.
推荐
Tank Level Hydrostatic Pressure Sensing
When mounted at the bottom of an open tank, the MPX12DP measures hydrostatic pressure proportional to liquid level. The differential port configuration uses the high-pressure port for the liquid column and the low-pressure port for atmospheric reference via a vent tube, cancelling barometric changes. The uncompensated output requires external temperature correction for outdoor installations where ambient swings of 30C to 40C would otherwise shift span by 3% to 5%.
推荐
Laboratory and Analytical Instrumentation
Low-range analytical instruments such as gas chromatographs, mass-flow controllers, and vacuum-chamber leak detectors use the MPX12DP for sub-atmospheric and very low absolute differential pressures down to 1 kPa. The uncompensated nature gives laboratory designers full control over thermal drift correction via precision references and chopper-stabilized instrumentation amps. The small 4-SIP package fits inside 1/4" tubing manifolds and OEM analytical modules where board space is constrained.
推荐
Portable Handheld Pressure Calibrator
Handheld field calibrators that verify the integrity of installed pressure transmitters and switches use the MPX12DP as the reference sensing element because of its low 0 to 10 kPa range and uncompensated raw bridge output that pairs with on-board temperature compensation firmware. The 4-SIP through-hole package and axial tubes make the device field-replaceable with simple tools. Battery-powered operation is supported by the low 3 V excitation requirement and milliwatt-level bridge current draw.
推荐
推荐产品汇总
工程参考数据： MPX12DP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MPX12D | MPX12GP | MPX12AP | MPX12GP6U | MPXV6250GC6U |
|---|---|---|---|---|---|---|
| Package | 4-SIP Module (through-hole axial ports) | 4-SIP Module (through-hole axial ports) | 4-SIP Module (vented gauge) | 4-SIP Module (absolute pressure) | 4-SIP Module (tape-and-reel lead form) | 6-SIP Module (surface-mount compatible) |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Pressure Type | Differential | Differential (identical) | Vented Gauge | Absolute | Vented Gauge | Differential |
| Operating Pressure Range | 0 to 10 kPa (0 to 1.45 PSI) | 0 to 10 kPa | 0 to 10 kPa | 0 to 10 kPa | 0 to 10 kPa | 0 to 250 kPa (25x higher) |
| Sensitivity (typical) | 5.5 mV/kPa | 5.5 mV/kPa | 5.5 mV/kPa | 5.5 mV/kPa | 5.5 mV/kPa | 20 mV/kPa (compensated 0-5V output) |
| Full-Scale Span (typical) | 35 mV at 3 V excitation | 35 mV | 35 mV | 35 mV | 35 mV | 5.0 V compensated |
| Compensation | Uncompensated (external required) | Uncompensated | Uncompensated | Uncompensated | Uncompensated | On-chip compensated |
| Output Type | Analog Wheatstone bridge (mV) | Analog Wheatstone bridge | Analog Wheatstone bridge | Analog Wheatstone bridge | Analog Wheatstone bridge | Analog 0 to 5 V compensated |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Lifecycle Status | Obsolete | Obsolete (same family) | Obsolete | Obsolete | Obsolete | Active (recommended modern replacement) |
关键差异点
- Differential port configuration eliminates barometric drift （对比 MPX12GP)
- Lowest cost in the MPX12 family for OEM volume designs （对比 MPXV6250GC6U)
- Uncompensated bridge gives designer full control over conditioning （对比 MPX6250D6)
设计说明
The MPX12DP outputs a millivolt-level differential bridge signal that is highly susceptible to thermocouple offsets and EMI. Use twisted-pair or shielded cable from the sensor pins to the instrumentation amplifier, with the guard trace driven at common-mode voltage to eliminate leakage. Keep the INA within 30 mm of the sensor and use a single-point ground at the excitation supply return to avoid ground loops that would otherwise appear as 1 to 5 mV drift on the 35 mV full-scale span.
Estimated: bridge span TC is approximately -1.1% per C relative to 25C. At a 30C ambient swing the full-scale span can drift 33 mV x 0.011 x 30 = 11.6 mV, which is 33% of full scale. Add an NTC thermistor (10 kohm at 25C, B=3950) in series with the gain-setting resistor of the instrumentation amplifier to provide first-order span TC compensation, and use a precision 3.000 V reference such as REF5025 to minimize excitation drift.
Do not apply pressure beyond 10 kPa to the high-side port - the silicon diaphragm will crack. Apply 3.0 V excitation from a low-impedance source capable of at least 6 mA continuous; do not use a current-limited lab supply below 10 mA because the bridge's internal compensation network expects a stiff voltage source. Tube fittings must use soft silicone or Tygon tubing that grips the 4.93 mm port - push-on barb compression leaks concentration.
Place the bridge decoupling capacitor (100 nF X7R minimum) directly across the VS and GND pins at the through-hole pads. Route the two bridge output traces as a differential pair with matched length and 0.2 mm spacing, and flood the surrounding area with a single-point-grounded guard ring tied to the INA reference pin. Avoid running digital clock traces parallel to the bridge output pair for more than 5 mm - the millivolt-level signal is easily corrupted by 50 mV of capacitive coupling.
合规信息
RoHS and lead-free status not explicitly documented in current NXP product page. MPX12 family pre-dates universal RoHS enforcement; contact NXP for part-specific compliance documentation. AEC-Q100 not applicable - this is a consumer/industrial-grade sensor, not automotive-qualified.
