Infineon Technologies KPY55-AK

Overview

KPY55-AK from Infineon Technologies is a silicon piezoresistive absolute pressure sensor in TO-8-5 metal can package, designed for high-stability measurement of 0–10 bar absolute pressure. It features integrated temperature sensing (R₂₅ ≈ 2 kΩ), ±0.15% V_fin linearity (best-fit straight line), 1.8–2.6 mV/V·bar sensitivity, and operates from −40 °C to +125 °C - used in industrial process monitoring and engine manifold pressure feedback.

For engineers reviewing the KPY55-AK datasheet, KPY55-AK pinout, KPY55-AK application, or KPY55-AK equivalent, key selection criteria include its absolute pressure range (0–10 bar), built-in temperature sensor terminals (pins 4 & 5), bridge resistance (4–8 kΩ), low hysteresis (±0.1% V_fin), and TO-8-5 mechanical robustness for harsh environments.

Technical Context

The KPY55-AK implements a monocrystalline silicon diaphragm with Wheatstone bridge configuration, delivering analog differential output (pins 2/6 = ±V_IN, pins 3/7 = ±V_OUT) referenced to supply voltage. Its integrated temperature sensor enables on-board thermal compensation without external components.

Electrical behavior is specified at 5 V excitation: full-scale output spans 90–130 mV (typ.), offset voltage is bounded within ±25 mV, and long-term stability exceeds 0.15% FS/year. Temperature coefficients are tightly controlled: TCV_fin = −0.17%/K (typ.), TCV₀ = ±0.03%/K (max), and TCR_B = +0.095%/K.

Key Specifications

Pinout & Package

Package: TO-8-5 metal can with capillary tube inlet (pin 1), hermetically sealed for long-term stability in humid or corrosive atmospheres. Weight ≈ 4.1 g; outline dimensions include ø10.92 mm body diameter and 17.3 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPX5700AP and SSCDANT015PGAA3, the KPY55-AK provides higher pressure range (0–10 bar), discrete bridge + dedicated temperature sensor terminals for custom compensation, and superior long-term stability - making it optimal for high-reliability analog-signal-chain implementations.

Availability

KPY55-AK is available at Aetrix Electronics and suitable for industrial process control, engine management systems, and medical gas delivery requiring stable component supply across multi-year production cycles.

Supply support for KPY55-AK 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 AEC-Q200.

The KPY series belongs to Infineon's legacy silicon piezoresistive pressure sensor product line, engineered for high-accuracy, high-stability absolute pressure measurement in demanding industrial and automotive environments.

FAQ

What is the recommended excitation voltage for KPY55-AK?

The KPY55-AK is characterized at 5 V supply, and its sensitivity, offset, and linearity specifications assume this excitation level. While absolute maximum rating allows up to 12 V, operation above 5 V increases self-heating and degrades temperature coefficient performance. For optimal accuracy and thermal stability, 5 V regulated supply is strongly recommended.

Can pins 4 and 5 be used for temperature compensation without external components?

Yes - pins 4 and 5 form a 2-terminal silicon temperature sensor with nominal R₂₅ ≈ 2 kΩ and TCR ≈ +0.095%/K. A simple constant-current source or voltage divider enables direct analog temperature readout, allowing real-time gain/offset correction of the bridge output in firmware or analog circuitry.

Is the capillary tube (pin 1) compatible with aggressive media like refrigerants or brake fluid?

The TO-8-5 package uses a stainless steel capillary tube and glass-metal seal rated for compatibility with dry air, nitrogen, and non-corrosive gases. It is not rated for direct contact with liquid refrigerants, brake fluid, or acidic/alkaline media. For such applications, a stainless steel isolation diaphragm or protective housing is required.

How does KPY55-AK handle pressure overload conditions?

The KPY55-AK has an absolute maximum overload rating of 30 bar - three times its full-scale 10 bar range. This is achieved via mechanical stop design in the monocrystalline silicon diaphragm. Exposure beyond 30 bar may cause permanent zero shift or bridge damage, and repeated overloads accelerate long-term drift even below this limit.