Infineon Technologies KPY54-RK

Overview

KPY54-RK from Infineon Technologies is a silicon piezoresistive relative pressure sensor with 0–4 bar full-scale range, 4–8 kΩ bridge resistance, ±0.15% V_fin linearity (best-fit straight line), integrated silicon temperature sensor (R₂₅ ≈ 2 kΩ), and TO-8-6 metal can package for high-stability industrial pressure monitoring in HVAC and pneumatic control systems.

For engineers reviewing the KPY54-RK datasheet, KPY54-RK pinout, KPY54-RK application, or KPY54-RK equivalent, key selection criteria include its calibrated bridge output (80–120 mV at 5 V supply), low temperature coefficient of sensitivity (−0.19 to −0.17 %/K), pressure hysteresis ≤ ±0.1% V_fin, and compatibility with ratiometric signal conditioning circuits using external instrumentation amplifiers.

Technical Context

The KPY54-RK implements a monocrystalline silicon Wheatstone bridge on a fatigue-free diaphragm, excited by a constant 5 V supply, delivering differential analog output (pins 2/6 = +/−VIN; pins 3/7 = −/+VOUT) proportional to applied relative pressure. Its integrated dual-terminal thermistor (pins 4 & 5) enables real-time temperature compensation.

Designed for frontside pressure coupling only, it operates across −40 °C to +125 °C with absolute maximum pressure overload of 16 bar. Bridge offset voltage is trimmed to ±25 mV at zero pressure, and long-term stability exceeds 0.1% FS/year under rated conditions.

Key Specifications

Pinout & Package

TO-8-6 metal can package with glass-sealed feedthroughs and capillary tube inlet (pin 1). Hermetically sealed for long-term stability in humid environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPX5700AP and SSCDANT004PGAA3, the KPY54-RK offers superior long-term stability and direct thermistor access for custom compensation algorithms, at the cost of requiring external signal conditioning - ideal for high-reliability industrial OEMs with analog design capability.

Availability

KPY54-RK is available at Aetrix Electronics and suitable for HVAC commissioning tools, pneumatic control modules, compressed air monitoring systems, and medical respiratory device production requiring stable component supply across multi-year product lifecycles.

Supply support for KPY54-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 leadership in silicon-based MEMS pressure sensing since the 1990s.

The KPY-RK series belongs to Infineon's legacy analog pressure sensor product line, engineered specifically for high-accuracy, high-reliability relative pressure measurement in harsh industrial environments where long-term drift and thermal hysteresis must be minimized.

FAQ

What is the recommended excitation voltage for KPY54-RK?

The KPY54-RK is characterized at 5 V DC excitation, and operation outside 4.75–5.25 V may alter sensitivity, offset, and linearity beyond datasheet limits. Higher voltages increase self-heating and thermal drift; lower voltages reduce signal-to-noise ratio and output swing below 80 mV full-scale.

Can KPY54-RK measure absolute pressure?

No - the KPY54-RK is a relative (gauge) pressure sensor with a vented backside reference cavity. It measures pressure difference between the frontside capillary port (pin 1) and ambient atmospheric pressure. For absolute pressure measurement, a sealed vacuum-reference variant such as KPY54-AK would be required.

How is temperature compensation implemented using pins 4 and 5?

Pins 4 and 5 form a 2-terminal 2 kΩ silicon thermistor. Compensation is achieved by measuring its resistance (e.g., with constant-current source or voltage divider), then applying stored polynomial coefficients or lookup table values to correct V_fin and V₀ per the published TCV_fin and TCV₀ specs across −40 to +125 °C.

Is the TO-8-6 package hermetically sealed?

Yes - the TO-8-6 metal can package uses glass-to-metal seals for all electrical feedthroughs and a welded cap, achieving hermeticity better than 1×10⁻⁸ atm·cm³/s He leak rate. This prevents moisture ingress and ensures long-term stability of the silicon diaphragm and bond wires in humid or corrosive environments.