Product Overview
Motorola Silicon MAP Sensor Element with Sealed Vacuum Reference, Gold Leads Still Bright
Condition
Unused, New Old Stock. Manufactured stock that has not been placed into service. In the photos the metal cap carries the Motorola batwing logo, the part marking MPX4250A, and the underlined lot code K003155 stamped below it, with a small port hole at the center of the cap. All six gold-plated leads are formed at a right angle to the round molded body, straight and bright, with no solder, no flux residue, and no lead trimming. The reverse side shows the open back of the case with two openings and a small dark square element between them. Against the millimeter ruler in the photos the round body measures approximately 16 mm across.
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Product Overview
The MPX4250A is a monolithic silicon absolute pressure sensor element originally developed for engine manifold pressure measurement, and this is the bare six-lead element rather than a hosed or bracketed assembly. It integrates a piezoresistive sensing diaphragm with on-chip temperature compensation, gain, and offset trimming, and it produces a ratiometric analog voltage proportional to absolute pressure referenced to an internal sealed vacuum cavity. Operating range is centered on 20 to 250 kPa absolute with 5.1 V nominal supply operation, so the output drops straight into a 5 V ADC input without external amplification. The photographed piece is marked MPX4250A with lot code K003155 on the cap, and its gold-plated leads are pre-formed at a right angle for board mounting.
Key Features
- Absolute pressure measurement referenced to an internal sealed vacuum
- Operating pressure range centered on 20 to 250 kPa absolute
- Calibrated, ratiometric analog voltage output for direct ADC interfacing
- On-chip temperature compensation, gain, and offset trim
- Designed for 5.1 V nominal supply operation
- Fast response to dynamic pressure changes
- Six gold-plated leads, formed at a right angle to the body
- Round molded case measuring approximately 16 mm across against the ruler
- Cap marked MPX4250A with lot code K003155
Applications
- An engine builder wiring a manifold absolute pressure channel into a standalone ECU or piggyback controller
- A firmware developer bringing up a boost or vacuum reading on a microcontroller ADC without adding an amplifier stage
- A lab technician building a bench absolute pressure monitor for a vacuum rig or a test fixture
- A restorer keeping an older engine control or fuel management board alive with a period-correct sensing element
Frequently Asked Questions
What is the K003155 stamped under the part number?
It is the manufacturer's lot and traceability marking on this batch, sitting below the MPX4250A part marking on the metal cap. We have not decoded it to a manufacturing date, so treat it as a lot reference only. MPX4250A is the number that identifies the device.
Do I need an external amplifier or signal conditioning circuit?
No. Gain, offset trim, and temperature compensation are integrated on the sensor, and the output is a ratiometric analog voltage intended to feed an ADC input directly on a 5 V rail.
Does this measure absolute pressure or gauge pressure?
Absolute. The reading is referenced to an internal sealed vacuum cavity rather than to ambient pressure, which is why it can report barometric shifts as well as manifold pressure.
Is a hose barb, bracket, or connector included?
No. What ships is the bare sensing element exactly as photographed: the molded body with the ported metal cap and six formed gold leads, nothing else. Pin function and full electrical limits are not confirmed here, so verify them against the MPX4250A datasheet before you power it up.
I need two of these for a prototype, not a full tray. Can I buy just two?
Yes, and that is the point of buying them here. Stock is deep enough that you order the exact count the job takes, one to prove the circuit or a couple so you have a spare on the bench, instead of committing to a factory tray or an auction lot of parts you will never open. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
The batwing on the cap and the sealed vacuum behind it come from the era when engine control learned to read manifold pressure as a voltage. This one never took its turn on an engine and has not been powered up here, so it waits on your bench for a clean, dry air path and a steady 5 V rail.
