Infineon Technologies KPY57-RK

Overview

KPY57-RK from Infineon Technologies is a silicon piezoresistive relative pressure sensor in TO-8-6 metal can package, designed for high-stability measurement of 0–60 bar differential or gauge pressure. It features a monocrystalline silicon diaphragm, integrated 2 kΩ silicon temperature sensor (pins 4 & 5), 0.47–0.67 mV/V·bar sensitivity, ±0.35% V_fin linearity (BFL), and −0.19 to −0.17 %/K tempco of full-scale output. Used in industrial hydraulic monitoring and engine manifold pressure sensing.

For engineers reviewing the KPY57-RK datasheet, KPY57-RK pinout, KPY57-RK application, or KPY57-RK equivalent, key selection criteria include its 60 bar full-scale range, TO-8-6 hermetic metal package with capillary tube inlet (pin 1), dual-bridge excitation/output configuration (pins 2/6/3/7), and integrated temperature sensing for on-board compensation.

Technical Context

The KPY57-RK implements a Wheatstone bridge piezoresistive sensing element fabricated on monocrystalline silicon, with frontside pressure coupling and KOVAR® center-tube rearside mounting option. Its bridge resistance is 4–8 kΩ at 25 °C, and it delivers 140–300 mV full-scale output at 5 V excitation.

Temperature compensation is enabled by an integrated 2 kΩ NTC-type silicon sensor (pins 4 & 5) with ±0.01 %/K TCR_B, while offset voltage drift is limited to ±0.05 %/K (TCV₀) and full-scale drift to −0.19 to −0.17 %/K (TCV_fin). Pressure hysteresis is ±0.1 % V_fin over full cycle.

Key Specifications

Pinout & Package

TO-8-6 hermetically sealed metal can package with glass-metal feedthroughs and integrated capillary tube (pin 1) for pressure port access. Dimensions: Ø10.92 mm × 17.3 mm height, weight ≈4.5 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPX5700AP and MS5837-02BA, the KPY57-RK uniquely supports 60 bar full-scale analog measurement in a hermetic metal package with integrated temperature sensing - making it the only viable option for high-range industrial gauge pressure systems requiring long-term stability and minimal external compensation.

Availability

KPY57-RK is available at Aetrix Electronics and suitable for industrial hydraulic monitoring, engine intake manifold sensing, compressor discharge control, and process vessel level measurement requiring stable component supply and long-lifecycle support.

Supply support for KPY57-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 pressure and motion sensing solutions.

The KPY-RK series belongs to Infineon's legacy high-stability piezoresistive pressure sensor product line, engineered for demanding industrial and transportation applications where long-term repeatability and hermetic reliability outweigh cost-sensitive consumer requirements.

FAQ

What is the correct excitation voltage and polarity for KPY57-RK?

The KPY57-RK requires a regulated 5 V DC supply applied between pins 2 (+VIN) and 6 (−VIN). Polarity reversal will not damage the device but causes inverted output polarity. Bridge current is ~0.6–1.25 mA depending on actual RB (4–8 kΩ), resulting in negligible self-heating under standard operation.

Can KPY57-RK be used for absolute pressure measurement?

No - the KPY57-RK is a relative (gauge or differential) pressure sensor with one side of the diaphragm exposed to ambient or reference pressure via the capillary tube (pin 1). Absolute measurement requires a sealed vacuum reference cavity, which this device does not contain.

How is temperature compensation implemented using pins 4 and 5?

Pins 4 and 5 form a 2 kΩ silicon NTC thermistor (R25 = 2 kΩ, TCR ≈ −0.095 %/K). Compensation is achieved by measuring its resistance in-series with a precision current source or voltage divider, then applying lookup-table or polynomial correction to V_fin and V₀ in firmware or analog circuitry.

Is the TO-8-6 package compatible with automated SMT assembly?

No - the TO-8-6 is a through-hole metal can package with radial leads and capillary tube protrusion. It requires manual or selective soldering, mechanical clamping, and pressure-port sealing. Reflow or wave soldering will damage the internal bond wires and compromise hermeticity.