Infineon Technologies D400N20BXPSA1

Overview

D400N20BXPSA1 from Eupec (now Infineon Technologies) is a high-power, press-pack silicon rectifier diode rated for 400 A mean forward current at 130 °C case temperature and 1200–2200 V repetitive peak reverse voltage, with 12.2 kA non-repetitive surge capability and 0.58 mΩ slope resistance - deployed in industrial medium-voltage DC traction converters and grid-tied HVDC rectification stacks.

For engineers reviewing the D400N20BXPSA1 datasheet, D400N20BXPSA1 pinout, D400N20BXPSA1 application, or D400N20BXPSA1 equivalent, key selection criteria include junction-to-case thermal resistance (0.098 °C/W), pressure-contact Si-pellet construction (∅30 mm), anode-case polarity, and I²t rating (744 kA²s at 25 °C) for short-circuit withstand in thyristor-controlled rectifier bridges.

Technical Context

This device operates as a unidirectional, two-terminal power rectifier with zero gate control - relying on external forced cooling and mechanical clamping to maintain thermal stability under continuous conduction mode. Its 180 °C maximum junction temperature and 0.094 °C/W DC thermal resistance to case enable operation in high-derating industrial environments where ambient temperatures exceed 60 °C.

The diode features a pressure-contact Si-pellet design (not soldered or bonded), requiring precise torque (60 Nm) on M24×1.5 terminals and flexible red/blue insulated ropes for anode/cathode connections. Its recovery charge Q_r and reverse recovery behavior are characterized per Fig. 6 under defined dI/dt and V_R conditions, critical for snubber design in line-commutated converters.

Key Specifications

Pinout & Package

Package: Press-pack, double-sided cooled, B-type housing (M24×1.5 threaded terminals), 70 mm² copper baseplate, 600 g typical weight, creepage distance 21 mm, humidity class DIN 40040 C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power rectifier diode applications.

Compared with SKKT 400/16 E and DD400S16K, D400N20BXPSA1 offers superior thermal resistance and higher I²t margin - making it preferred for high-reliability, high-derating rectifier stacks where long-term thermal cycling stability is critical.

Availability

D400N20BXPSA1 is available at Aetrix Electronics and suitable for railway traction rectifiers, industrial HVDC power supplies, grid-tied SVC cabinets, and medium-voltage UPS input stages requiring stable component supply across multi-year production cycles.

Supply support for D400N20BXPSA1 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 GmbH + Co. KG was a European power semiconductor specialist acquired by Infineon Technologies in 2000 - known for rugged press-pack and module solutions for industrial and traction markets.

D400N20BXPSA1 belongs to Eupec's D400N series of high-current, high-voltage rectifier diodes designed specifically for line-commutated, medium-voltage AC/DC conversion in rail, energy, and heavy industry.

FAQ

What is the correct mounting torque for D400N20BXPSA1?

The specified tightening torque for the M24×1.5 threaded terminals is 60 Nm. This value ensures optimal pressure contact between the 30 mm Si-pellet and copper baseplate, minimizing contact resistance and preventing thermal hotspots. Under-torque risks increased R_thJC and premature failure; over-torque may deform the housing or damage internal seals. Torque must be applied with calibrated tooling and verified per batch during production assembly.

Does D400N20BXPSA1 require a heatsink? If so, what thermal interface material is recommended?

Yes - D400N20BXPSA1 requires a heatsink due to its 0.098 °C/W R_thJC and 400 A I_FAVM rating. For press-pack mounting, use thermally conductive, non-silicone-based grease (e.g., Dow Corning TC-5022) or phase-change pads (e.g., Laird TPCM 600) between the copper baseplate and heatsink surface. Avoid silicone-based pastes that may outgas and contaminate adjacent insulation or sensors in sealed cabinets.

Can D400N20BXPSA1 be used in parallel configurations?

Yes - parallel operation is supported via matched V_F binning (±20 mV at 1.4 kA) and symmetric busbar layout. Each device must have identical thermal resistance paths and individual snubbers to prevent current imbalance. Parallel strings require dynamic current-sharing analysis using the provided Z_thJC model (Fig. 7) and measured r_T values to ensure <5% current deviation at full load and transient peaks.

Is there a replacement part number after Eupec's acquisition by Infineon?

Infineon retained the D400N20BXPSA1 designation post-acquisition and continues to manufacture and support it under the same datasheet (Order Code: D400N20BXPSA1). No functional replacement or renumbering occurred - the device remains fully compatible with legacy Eupec designs, and Infineon provides updated reliability reports and application notes via their official portal.