Infineon Technologies D170S25CXPSA1

Overview

D170S25CXPSA1 from eupec (Infineon Technologies) is a fast recovery silicon rectifier diode designed for high-power AC/DC conversion in industrial inverters and traction systems. It delivers 170 A mean forward current at TC = 85°C, 2500 V repetitive peak reverse voltage, and 4 µs reverse recovery time with 870 µAs recovered charge - enabling efficient operation in 50–60 Hz line-frequency and medium-frequency switching applications such as motor drives and UPS systems.

For engineers reviewing the D170S25CXPSA1 datasheet, D170S25CXPSA1 pinout, D170S25CXPSA1 application, or D170S25CXPSA1 equivalent, key selection criteria include its 140°C max junction temperature, 0.19 °C/W junction-to-case thermal resistance, softness factor of 0.004 µs/A, and pressure-contact 23 mm Si pellet construction - all critical for thermal management and EMI-sensitive high-current rectification.

Technical Context

This diode employs a planar passivated silicon chip with soft reverse recovery behavior (SR = 0.004 µs/A), minimizing voltage overshoot during commutation. Its low forward slope resistance (r_T = 1.4 mΩ) and threshold voltage (V_(TO) = 1.1 V) support high-efficiency conduction at rated currents up to 800 A transient peak.

The device uses a stud-mount, double-side cooled package with M20 mounting torque and single-sided case-to-heatsink thermal resistance of 0.04 °C/W. It complies with IEC 747-2 for reverse recovery metrics including t_rr = 4 µs, Q_r = 870 µAs, and I_RM = 340 A under standardized test conditions (i_FM = 500 A, −di_F/dt = 200 A/µs).

Key Specifications

Pinout & Package

Package: Stud-mount, pressure-contact, double-sided cooling, 23 mm Si pellet, M20 mechanical fixing, 110 g mass. Case serves as cathode terminal; anode is accessible via threaded stud.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast rectifier diode applications.

Compared with MDD170-24N1 and STTH1602CS, D170S25CXPSA1 offers superior voltage margin (2500 V), lower thermal resistance, and optimized softness for high-reliability industrial stacks - making it the preferred choice for mission-critical 300+ kW rectification where thermal and EMI robustness are non-negotiable.

Availability

D170S25CXPSA1 is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, traction converters, and medium-voltage rectifier stacks requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for D170S25CXPSA1 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

eupec was a German semiconductor division specializing in high-power discrete devices, later fully integrated into Infineon Technologies in 2001. It pioneered pressure-contact thyristor and diode technology for industrial energy conversion.

D170S25CXPSA1 belongs to eupec's D-S series of fast recovery rectifiers engineered for high-current, high-voltage AC/DC conversion in rail traction, industrial drives, and power transmission - emphasizing thermal robustness, soft switching, and long-term reliability under cyclic loading.

FAQ

What is the maximum allowable mounting torque for D170S25CXPSA1?

The specified mechanical mounting torque is 20 Nm for the M20 anode stud. Exceeding this value risks deformation of the internal pressure-contact structure, leading to increased forward voltage, localized heating, and premature failure. Torque must be applied using a calibrated tool with controlled ramp rate to ensure uniform pellet contact without micro-fracture.

Does D170S25CXPSA1 require a heatsink on both sides?

Yes - the device is designed for double-sided cooling: the case (cathode) and stud (anode) are both thermally active surfaces. Effective thermal management requires heatsinks mounted on both sides with thermal interface material, achieving the stated R_thJC = 0.19 °C/W and R_thCK = 0.04 °C/W values. Single-sided cooling de-rates I_FAVM by ≥35%.

Can D170S25CXPSA1 be used in parallel configurations?

Parallel operation is feasible but requires strict matching of forward voltage characteristics (V_F at 800 A) and thermal mounting conditions. The datasheet specifies ±5% V_F tolerance at T_vj = 140°C; unmatched units will experience current imbalance exceeding 20%, risking thermal runaway. Forced-air or liquid cooling with individual thermal sensors is mandatory.

What is the creepage distance and why does it matter for D170S25CXPSA1?

The creepage distance is 12 mm, measured along the insulating surface between anode and cathode terminals. This value meets IEC 60664-1 requirements for Pollution Degree 2 environments at 2500 V working voltage, ensuring reliable isolation in dusty or humid industrial enclosures without tracking or surface flashover under sustained overvoltage stress.