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Home > Products > Sensors, Transducers > Pressure Sensors, Transducers

Infineon Technologies KPY33-RK

Name: KPY33-RK
Brand: Infineon Technologies
SKU: KPY33-RK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KPY33-RK

Manufacturer:: Infineon Technologies

Category:: Pressure Sensors, Transducers

Package:: TO-8 Style, 8 Leads

Datasheet:: KPY33-RK.pdf

Description:: SENSOR 1.45PSI 0.2" .04V TO8-2

Quantity:: RFQ Add To RFQ list

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Inventory:2,080

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Product details

Overview

KPY33-RK from Infineon Technologies is a silicon piezoresistive relative pressure sensor in TO-8-2 metal can package, designed for low-pressure measurement (0–0.1 bar), featuring 80.0 mV/Vbar typical sensitivity, ±0.2% V_fin linearity error (best-fit straight line), and integrated dual-terminal temperature sensor (R₂₅ ≈ 2 kΩ). It is used in precision HVAC airflow monitoring and medical respiratory device differential pressure sensing.

For engineers reviewing the KPY33-RK datasheet, KPY33-RK pinout, KPY33-RK application, or KPY33-RK equivalent, key selection criteria include bridge resistance (4–8 kΩ), temperature coefficient of output voltage (−0.19 to −0.10 %/K), pressure hysteresis (±0.1 % V_fin), and required external excitation (5 V DC).

Technical Context

The KPY33-RK employs a monocrystalline silicon diaphragm with four diffused piezoresistors forming a Wheatstone bridge, excited by a constant-voltage supply. Its output is ratiometric to VIN, enabling direct interfacing with ADCs without separate reference scaling.

It integrates two dedicated terminals (pins 4 and 5) for a thermistor-based temperature sensor (R₂₅ = 2 kΩ, ±5%), allowing on-chip thermal compensation. Pin 6 serves as electrostatic shielding tied to +VIN, while pins 3 and 7–8 define unconnected and differential output paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Pressure Range	0 to 0.1 bar (relative); suitable for sub-atmospheric and low-differential gas flow sensing
Sensitivity	80.0 mV/Vbar typ.; delivers 40.0 mV full-scale output at 5 V excitation
Linearity Error	±0.2% V_fin (BFS); enables <100 Pa absolute accuracy in 0–10 kPa range
Bridge Resistance	4–8 kΩ; matches standard instrumentation amplifier input impedance requirements
Temp. Coeff. of V_fin	−0.19 to −0.10 %/K; requires linear compensation slope of −0.145 %/K for stable output
Operating Temp.	−40 °C to +125 °C; supports under-hood automotive and industrial enclosure environments

Pinout & Package

Package: TO-8-2 metal can, 8-pin, hermetically sealed, weight ≈ 3.3 g, with shielding terminal and dedicated temperature sensor leads.

Pin/Terminal	Circuit Role	Design Meaning
1	+V_OUT	Differential output positive; connects to non-inverting input of instrumentation amplifier
2	+V_IN	Bridge excitation positive; must be clean, regulated 5 V DC source
3	Not connected	No internal connection; leave floating or grounded per layout EMI mitigation
4	Temp sensor (1)	Thermistor terminal A; used with pin 5 to measure die temperature for compensation
5	Temp sensor (2)	Thermistor terminal B; forms 2 kΩ resistive divider with pin 4 at 25 °C
6	Shielding	Electrostatic shield; must be tied to +V_IN to suppress common-mode noise
7	−V_OUT	Differential output negative; connects to inverting input of instrumentation amplifier
8	−V_IN	Bridge excitation return; connect directly to system ground or low-impedance analog ground

Key Features

Feature	Design Value
Fatigue-free monocrystalline silicon diaphragm	Enables >1 million pressure cycles without drift; validated for long-term medical device deployment
Low pressure hysteresis (±0.1 % V_fin)	Ensures repeatable readings across bidirectional pressure sweeps in ventilation control loops
Integrated dual-terminal thermistor (R₂₅ = 2 kΩ)	Permits on-die temperature compensation without external sensor placement or routing
High long-term stability	Drift <0.1% FS/year; eliminates need for field recalibration in fixed-installation HVAC systems
TO-8-2 metal can shielding	Provides EMI immunity in noisy industrial motor drive enclosures and automotive engine bays

Applications

Medical Respiratory Monitoring

HVAC Airflow Control

Use Scenario: Measuring differential pressure across breathing circuit filters and humidifiers in ICU ventilators.

IC Role / Device Role / Timing Role: Relative pressure transducer providing analog bridge output proportional to airway resistance changes.

Use Value: ±0.1% V_fin hysteresis ensures consistent alarm thresholds during inhalation/exhalation cycling.

Use Scenario: Detecting duct static pressure drop across VAV boxes and HEPA filters in commercial buildings.

IC Role / Device Role / Timing Role: Low-range pressure sensing element feeding analog front-end of building management controller.

Use Value: 80.0 mV/Vbar sensitivity yields >30 mV signal at 5 V supply, simplifying 12-bit ADC resolution requirements.

Automotive Cabin Pressure Sensing

Industrial Vacuum Leak Detection

Use Scenario: Monitoring cabin pressure differential during active climate control and altitude compensation in premium vehicles.

IC Role / Device Role / Timing Role: Relative pressure sensor referenced to ambient, mounted behind dashboard trim panel.

Use Value: −40 °C to +125 °C operating range supports under-dash mounting near HVAC actuators.

Use Scenario: Quantifying vacuum decay rate in semiconductor process chambers and vacuum packaging lines.

IC Role / Device Role / Timing Role: High-stability transducer measuring sub-100 mbar pressure decay over 60-second intervals.

Use Value: <0.1% FS/year long-term stability avoids recalibration between production batches.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPXV5004DP	4-pin SOIC, 0–4 kPa range, integrated signal conditioning, ratiometric 0.2–4.8 V output	Requires no external amplifier; less flexible gain/offset tuning than KPY33-RK's raw bridge	Select when board space is constrained and analog signal chain simplification is prioritized over calibration flexibility
SSCDANT015PGAA3	5 V powered, digital I²C output, 0–15 PSI (≈1.03 bar), factory-calibrated, ±0.25% FS accuracy	Delivers compensated digital data; lacks discrete temperature sensor terminals for custom compensation algorithms	Select when microcontroller has I²C interface and firmware handles calibration; not suitable for analog-only systems

Compared with MPXV5004DP and SSCDANT015PGAA3, the KPY33-RK offers superior long-term stability and user-configurable analog signal conditioning, but requires external amplification and custom temperature compensation-ideal for high-reliability analog systems where calibration control is critical.

Availability

KPY33-RK is available at Aetrix Electronics and suitable for medical respiratory monitoring, HVAC airflow control, automotive cabin pressure sensing, and industrial vacuum leak detection requiring stable component supply and long-lifecycle support.

Supply support for KPY33-RK 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 is a German semiconductor manufacturer specializing in power management, sensor, and automotive ICs, with global manufacturing and quality certification to ISO/TS 16949 and ISO 13485.

The KPY33-RK belongs to Infineon's legacy KPY series of piezoresistive pressure sensors, engineered for high-accuracy analog pressure measurement in safety-critical and maintenance-sensitive applications.

FAQ

What excitation voltage is required for KPY33-RK operation?

The KPY33-RK is specified for 5 V DC excitation (V_IN), delivering 40.0 mV full-scale output. Absolute maximum supply is 12 V, but operation above 5 V increases self-heating and degrades temperature coefficient performance. Stable, low-noise regulation is mandatory-ripple must remain below 10 mV_pp to maintain ±0.1% linearity.

How is temperature compensation implemented using pins 4 and 5?

Pins 4 and 5 form a 2 kΩ NTC thermistor at 25 °C. By measuring resistance across these pins (e.g., via constant-current source or voltage divider), the die temperature is derived and used to correct V_fin using the published TCV_fin (−0.145 %/K typ.) and TCV₀ (±0.05 %/K) coefficients from the datasheet.

Can pin 3 be grounded or left floating in PCB layout?

Pin 3 is internally unconnected and may be left floating. However, grounding it improves EMI immunity in high-noise environments. If grounded, ensure the connection shares the same low-impedance analog ground plane as pin 8 (−V_IN) to avoid ground loops that could modulate bridge offset.

What is the significance of the TO-8-2 shielding terminal (pin 6)?

Pin 6 connects to the metal can's internal electrostatic shield. It must be tied directly to +V_IN (not system ground) to equalize potential between shield and bridge supply, minimizing capacitive coupling of supply noise into the high-impedance bridge output. Failure to connect causes >10× increase in 50/60 Hz interference.

KPY33-RK Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-8 Style, 8 Leads

Packaging:: Bulk

Product Status:: Active

Applications:: Board Mount

Pressure Type:: -

Operating Pressure:: 1.45PSI (10kPa)

Output Type:: Wheatstone Bridge

Output:: 0 mV ~ 40 mV (12V)

Accuracy:: -

Voltage - Supply:: 12V

Port Size:: Male - 0.2" (5mm) Tube

Port Style:: Barbless

Features:: -

Termination Style:: PC Pins

Maximum Pressure:: 14.5PSI (100kPa)

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-8-2

KPY33-RK FAQ

1.How can I place an order for KPY33-RK through Aetrix?

Please submit a Request for Quotation (RFQ) for KPY33-RK 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 KPY33-RK reliable?

The price and inventory of KPY33-RK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KPY33-RK is usually 5 days.

3.What payment methods are accepted for KPY33-RK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KPY33-RK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KPY33-RK?

KPY33-RK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KPY33-RK 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 KPY33-RK?

For technical support, including KPY33-RK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KPY33-RK requirements.

6.How does Aetrix verify that KPY33-RK is sourced from the original manufacturer or authorized distributors?

All KPY33-RK 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 KPY33-RK meets industry standards.

7.What is the process for return or replacement of KPY33-RK?

All KPY33-RK units undergo pre-shipment inspection (PSI). If there is an issue with KPY33-RK, 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 KPY33-RK part is unused and in its original packaging.

Return procedure for KPY33-RK:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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