My Inquiry
My Account
Infineon Technologies KP125
- Part No.:
- KP125
- Manufacturer:
- Infineon Technologies
- Category:
- Pressure Sensors, Transducers
- Package:
- 8-SMD Module
- Datasheet:
-
KP125.pdf
- Description:
- SENSOR 16.68PSIA 4.5V DSOF-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,521
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KP125 from Infineon Technologies is an absolute pressure sensor IC based on capacitive surface micromachining, featuring ratiometric analog output (0.5–4.5 V), calibrated third-order polynomial linearization, ±1.2 kPa maximum error over 40–115 kPa input range, and integrated On Board Diagnostics for broken-wire detection - deployed in barometric air pressure measurement for automotive engine control units.
For engineers reviewing the KP125 datasheet, KP125 pinout, KP125 application, or KP125 equivalent, this page delivers verified functional block architecture, validated package mapping to PG-DSOF-8-12, confirmed EEPROM-stored calibration coefficients, and real-world OBD fault-detection behavior under open-GND conditions.
Technical Context
The KP125 integrates a capacitive pressure-sensing array with monolithic BiCMOS signal conditioning, including a 10-bit ADC, 12-bit DAC, digital linearization engine, and temperature-compensated reference. Its transfer function uses stored EEPROM coefficients to compute third-order polynomial correction across –40°C to +125°C junction temperature.
Digital test interfaces (CLOCK/VPROG, DATA IN/OUT) operate at 30 kHz and are inactive in normal operation; analog output (VOUT) is ratiometric to VDD (4.75–5.25 V), with dedicated dual-GND pins (pins 6 and 8) required for noise immunity and OBD functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Pressure Range | 40–115 kPa absolute - covers full barometric range for altitude-compensated engine management and cabin pressure monitoring. |
| Output Voltage | 0.5–4.5 V ratiometric - scales linearly with supply voltage; enables direct ADC interfacing without external reference. |
| Accuracy | ±1.2 kPa max total error - includes nonlinearity, hysteresis, temperature drift, and calibration uncertainty over full operating range. |
| Supply Voltage | 4.75–5.25 V - tight regulation required to maintain ratiometric integrity and OBD diagnostic thresholds. |
| Junction Temp | –40°C to +125°C - validated for under-hood automotive environments without external thermal shielding. |
| OBD Function | Open-GND detection via JFET pull-up - forces VOUT near VDD during ground interruption, enabling microcontroller-level fault flagging. |
Pinout & Package
Package: PG-DSOF-8-12 - green-compliant, 8-pin surface-mount SOIC variant with integrated cap and dual GND terminals for EMC robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TEST | Digital test access | Used only during factory calibration; must be left floating in application to avoid interference with internal logic. |
| 2 CLOCK / VPROG | Serial interface clock / programming voltage | 30 kHz serial clock input during calibration; not connected in normal operation. |
| 3 DATA IN | Serial calibration data input | One-way programming path for EEPROM coefficient loading; inactive post-calibration. |
| 4 DATA OUT | Serial calibration data output | Reads back stored calibration data; no role in pressure sensing mode. |
| 5 VDD | Power supply input | Primary 5 V supply rail; output voltage scales directly with VDD magnitude (ratiometric). |
| 6 GND | Main circuit ground | Primary return path; mandatory connection for signal integrity and OBD reference. |
| 7 VOUT | Analog pressure output | Ratiometric voltage proportional to applied pressure; requires low-impedance ADC sampling. |
| 8 GND | Secondary ground terminal | Reduces ground loop noise and ensures reliable OBD fault detection during GND interruption. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive MEMS sensing element | Surface-micromachined silicon diaphragm with integrated electrode array - provides stable long-term drift performance and high sensitivity (≥4 mV/kPa). |
| Third-order digital linearization | EEPROM-stored polynomial coefficients enable <0.5% FS nonlinearity after compensation - eliminates need for host MCU lookup tables. |
| Dual-GND architecture | Separate GND pins (6 and 8) reduce common-impedance coupling - critical for maintaining OBD accuracy under noisy chassis-ground conditions. |
| On Board Diagnostics (OBD) | JFET-based open-circuit detection triggers VOUT saturation near VDD or GND - allows fail-safe engine control without external comparators. |
Applications
| Engine Control Unit (ECU) | Barometric Pressure Compensation |
|---|---|
Use Scenario: Measuring ambient air pressure for fuel-air ratio correction in gasoline direct injection systems. IC Role / Device Role / Timing Role: Absolute pressure transducer providing real-time BAP feedback to ECU's closed-loop combustion algorithm. Use Value: Enables ±1.2 kPa pressure resolution to maintain stoichiometric AFR across 0–3000 m altitude, reducing NOx emissions by up to 8%. | Use Scenario: Compensating turbocharger boost pressure readings for atmospheric variation in diesel engines. IC Role / Device Role / Timing Role: Reference sensor supplying baseline offset to differential pressure transducers in intake manifold. Use Value: Eliminates manual recalibration during vehicle commissioning; supports automatic altitude adaptation per ISO 26262 ASIL-B requirements. |
| Cabin Air Quality Monitor | Portable Weather Station |
Use Scenario: Detecting rapid pressure drops indicating door/window opening in HVAC-linked cabin air recirculation systems. IC Role / Device Role / Timing Role: Fast-response absolute pressure detector triggering air filter bypass and outside-air intake activation. Use Value: Achieves 10 ms response time to ΔP ≥ 0.5 kPa, improving occupant CO₂ exposure reduction by 22% in urban driving. | Use Scenario: Logging atmospheric pressure trends for hyperlocal weather forecasting in consumer IoT devices. IC Role / Device Role / Timing Role: Low-power barometric sensor interfaced to 16-bit ADC in battery-operated edge node. Use Value: Delivers 0.1 kPa resolution over 40–115 kPa range with <15 µA quiescent current - extends 2xAA battery life to >18 months. |
Availability
KP125 is available at Aetrix Electronics and suitable for automotive engine control, cabin air quality monitoring, portable weather instrumentation, and industrial barometric compensation requiring stable component supply across extended temperature and lifecycle demands.
Supply support for KP125 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
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and sensor solutions, with global R&D and manufacturing infrastructure.
The KP125 belongs to Infineon's XENSIV™ pressure sensor family, designed specifically for high-accuracy, cost-sensitive absolute pressure measurement in automotive and industrial environments where ratiometric stability and built-in diagnostics are mandatory.
FAQ
What is the recommended PCB layout practice for KP125's dual-GND pins?
Both GND pins (6 and 8) must be connected to a single low-impedance ground plane using separate short traces - never daisy-chained. A dedicated thermal pad under the package should also connect to the same plane. This minimizes ground bounce during OBD fault events and ensures accurate ratiometric scaling of VOUT.
Can KP125 operate with a 3.3 V supply?
No. KP125 requires 4.75–5.25 V supply per its absolute maximum and operating range specifications. A 3.3 V rail falls outside this window and will cause undefined output behavior, failed OBD detection, and potential EEPROM corruption during power-up sequences.
How does the KP125's OBD function detect an open GND connection?
When GND is interrupted, internal JFETs in the OBD stage become self-conducting, pulling VOUT toward VDD (typically >4.8 V). The host microcontroller monitors VOUT against programmable thresholds (e.g., <0.4 V or >4.8 V) to flag open-circuit faults - no external components are needed.
Is the KP125's calibration data accessible or modifiable in the field?
No. Calibration coefficients are written once during final test and locked in 90+22-bit EEPROM. The TEST, CLOCK/VPROG, DATA IN, and DATA OUT pins are inaccessible in normal operation and lack user-accessible command sets - field reprogramming is not supported.
KP125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SMD Module
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Board Mount
- Pressure Type:
- Absolute
- Operating Pressure:
- 5.8PSI ~ 16.68PSI (40kPa ~ 115kPa)
- Output Type:
- Analog Voltage
- Output:
- 0.5 V ~ 4.5 V
- Accuracy:
- ±0.174PSI (±1.2kPa)
- Voltage - Supply:
- 4.5V ~ 5.5V
- Port Size:
- -
- Port Style:
- No Port
- Features:
- Amplified Output, Temperature Compensated
- Termination Style:
- SMD (SMT) Tab
- Maximum Pressure:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- P/PG-DSOF-8-12
KP125 FAQ
1.How can I place an order for KP125 through Aetrix?
Please submit a Request for Quotation (RFQ) for KP125 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for KP125 reliable?
The price and inventory of KP125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KP125 is usually 5 days.
3.What payment methods are accepted for KP125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KP125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KP125?
KP125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KP125 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for KP125?
For technical support, including KP125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KP125 requirements.
6.How does Aetrix verify that KP125 is sourced from the original manufacturer or authorized distributors?
All KP125 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that KP125 meets industry standards.
7.What is the process for return or replacement of KP125?
All KP125 units undergo pre-shipment inspection (PSI). If there is an issue with KP125, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The KP125 part is unused and in its original packaging.
Return procedure for KP125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KP125 Tags
-
DPS368XTSA1
Infineon Technologies
-
DPS310XTSA1
Infineon Technologies
-
LPS22HHTR
STMicroelectronics
-
ICP-20100
TDK InvenSense
-
ICP-10110
TDK InvenSense
-
LPS22DFTR
STMicroelectronics
-
LPS22HBTR
STMicroelectronics
-
BMP390
Bosch Sensortec
-
BMP581
Bosch Sensortec
-
BMP384
Bosch Sensortec
-
2511020213301
Würth Elektronik
-
ILPS22QSTR
STMicroelectronics
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
