Part Information Review and Update

flux

I reviewed the part project as it exists now.
Overall status
  • Datasheet URL is already set in the project, and it points to the official Sensirion PDF on sensirion.com, so no datasheet-property update was needed.
  • The project metadata is partially complete, but some fields are too generic for a polished part project.
  • The symbol/terminal set is incomplete from a metadata standpoint: all terminals currently have Pin Type = Unspecified, and I don’t see any pin descriptions, sections, or pin-group metadata.
  • The footprint and symbol are broadly aligned in count, but the footprint contains 3 additional internal/mount pads beyond the 18 named signal/EP pads, which should be verified against the mechanical recommendation.
Current part information in the project
From the project properties and schematic/layout:
  • MPN: SDP33-1500Pa-TR-250pcs
  • Manufacturer: Sensirion
  • Part Type: Sensors
  • Designator Prefix: IC
  • Package or Case Code: SMD
  • Description: Pressure Sensor +/-0.22PSI (+/-1.5kPa) Differential Male - 0.08" (2.00mm) Tube, Dual 16 b 16-SMD Module, Dual Top Ports
Symbol / schematic terminals present
I found 18 terminal components in the symbol:
  1. GND_1
  2. GND_2
  3. GND_3
  4. IRQN
  5. SCL
  6. GND_4
  7. VDD
  8. SDA
  9. ADDR
  10. GND_5
  11. GND_6
  12. RESERVED_1
  13. RESERVED_2
  14. RESERVED_3
  15. RESERVED_4
  16. RESERVED_5
  17. EP_1
  18. EP_2
Footprint pads present
The default footprint contains:
  • 18 named pads matching the symbol labels: GND_1, GND_2, GND_3, IRQN, SCL, GND_4, VDD, SDA, ADDR, GND_5, GND_6, RESERVED_1..5, EP_1, EP_2
  • 3 extra pads under the mounts container labeled: 19, 20, 21
What the official datasheet confirms
The official Sensirion datasheet URL already stored in the project is also what Sensirion publishes from the product page, so that part looks correct.
From the official search results for the SDP33 family:
  • It is an SDP33 digital differential pressure sensor from Sensirion.
  • Interface pins include SDA and SCL.
  • It includes IRQN.
  • It includes ADDR.
  • The datasheet explicitly notes:
    • IRQN may be left unconnected if unused, and should not be tied to VDD or GND.
    • ADDR should not be connected to VDD.
    • Reserved pins should remain reserved.
    • The exposed/center pad should be soldered to the PCB.
Key specs summary
Based on the part naming, project description, and official Sensirion product/datasheet references:
  • Device: Digital differential pressure sensor
  • Pressure range: ±1500 Pa (also reflected in the project description)
  • Interface: I²C via SDA / SCL
  • Extra digital pins: IRQN, ADDR
  • Mechanical style: dual top ports / tube ports
  • Manufacturer: Sensirion
  • Variant: SDP33-1500Pa-TR-250pcs
Mismatches / issues flagged 1) Package metadata is too generic
  • Current property: Package or Case Code = SMD
  • Issue: this is not specific enough for a reusable part.
  • It should be replaced with the actual package/module name from the datasheet, not just “SMD”.
2) Symbol terminals are missing pin metadata
All 18 terminals currently show:
  • Pin Type = Unspecified
And I do not see populated:
  • Pin Description
  • Section
  • Pin Group
  • Pin Orientation
For a part project, that’s a significant metadata gap. At minimum:
  • VDD should be Power In
  • GND_x and likely exposed pad(s) should be Ground
  • SDA is likely Bi-Directional
  • SCL is typically Input or sometimes left Bi-Directional depending on modeling style
  • IRQN should be Output
  • ADDR should be Input
  • RESERVED_x should not remain generic/unexplained; they should be marked clearly per datasheet usage guidance
3) Pin descriptions are effectively missing
Even where names exist, the terminals are missing short functional descriptions. That means the symbol is usable, but not well-documented.
4) Footprint has 3 extra pads beyond the 18 symbol terminals
  • Symbol exposes 18 terminals
  • Footprint has 18 named pads + 3 extra pads (19/20/21)
This is not automatically wrong. Those 3 extra pads may be:
  • mechanical anchor pads,
  • segmented exposed-pad copper,
  • or paste/land subdivision features.
But because they are separate PCB pads and not represented as symbol terminals, they should be checked against the mechanical drawing/land pattern. If they are electrically tied exposed-pad segments, the footprint may need cleanup or clearer intent.
5) Description is usable but not ideal
The description contains useful information, but it reads like a distributor string rather than a clean part-library description. A better part description would be something like:
  • “Digital differential pressure sensor, ±1500 Pa, I²C interface, dual top ports”
Cross-check conclusion Looks correct
  • MPN
  • Manufacturer
  • Datasheet URL
  • Presence of expected digital-interface style pins: VDD, SDA, SCL, IRQN, ADDR
  • Presence of multiple grounds and reserved pins
  • Symbol-to-footprint mapping for the 18 named pads
Needs attention
  • Package or Case Code
  • Pin Type for every terminal
  • Pin descriptions
  • Possibly section/group/orientation metadata
  • Verification of the extra footprint pads 19/20/21
  • Clarification of whether EP_1 / EP_2 correctly reflects the datasheet’s exposed-pad implementation
Most important flags
  1. No pin typing is defined
  2. No pin descriptions are defined
  3. Package field is too vague
  4. Extra footprint pads 19/20/21 need mechanical verification
  5. Exposed-pad representation should be checked carefully
If you want, I can do the next pass and update the part metadata and terminal properties to make this part project datasheet-aligned.
Fix all mismatches
Review decoupling issues
Document part audit
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SDP33-1500Pa-TR-250pcs

SDP33-1500Pa-TR-250pcs thumbnail
Pressure Sensor +/-0.22PSI (+/-1.5kPa) Differential Male - 0.08" (2.00mm) Tube, Dual 16 b 16-SMD Module, Dual Top Ports The SDP33-1500Pa-TR-250PCS is a digital differential pressure sensor module from Sensirion AG, designed for high-precision measurement of low-pressure differences up to ±1500 Pa (±1.5 kPa). It belongs to the SDP3x series, which uses Sensirion’s CMOSens® technology for compact, accurate, and stable sensing performance.
It is widely used in HVAC systems, airflow measurement, medical devices, and industrial control applications where precise air or gas flow monitoring is required.
Key Features Differential Pressure Measurement Range: ±1500 Pa (±1.5 kPa) Digital Output Interface I²C communication for easy MCU integration High Resolution 16-bit digital output Accurate & Stable Performance Factory-calibrated and temperature compensated No zero-point drift Low Power Consumption Designed for battery-powered and embedded systems Compact SMD Module Small footprint, surface-mount package (easy PCB integration) Fast Response Time Suitable for real-time airflow and pressure monitoring Wide Operating Conditions Supply voltage: ~3.3V Operating temperature: -40°C to +85°C Reflow Solderable Compatible with standard SMT manufacturing processes Reliable Long-Term Stability Built for high-volume industrial and commercial applications Typical Applications HVAC airflow and filter monitoring Ventilation and air quality systems Medical respiratory devices Industrial automation and process control Drones and airspeed (pitot tube systems) IoT environmental sensing #CommonPartsLibrary #Sensor

Properties

SDP33-1500PA-TR-250PCS

Sensirion AG

Sensors

sensirion.com/media/documents/6B7302AA/6375F33C/DP_DS_SDP33_D1.pdf

U

Surface Mount

SMD

creativecommons.org/licenses/by/4.0/

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