Infineon Technologies D1381S45TXPSA1

Overview

D1381S45TXPSA1 from eupec (Infineon Technologies) is a high-power fast recovery rectifier diode designed for high-voltage, high-current industrial DC link and traction applications. It features a repetitive peak reverse voltage of 4500 V, RMS forward current of 2560 A, and maximum junction temperature of 140 °C. Its low forward slope resistance (0.48 mΩ) and fast recovery charge (2800 µAs) support efficient operation in 50 Hz line-commutated converters and medium-frequency chopper circuits.

For engineers reviewing the D1381S45TXPSA1 datasheet, D1381S45TXPSA1 pinout, D1381S45TXPSA1 application, or D1381S45TXPSA1 equivalent, key selection criteria include verified VRRM/IFRMSM derating at elevated case temperatures, thermal resistance (RthJC ≤ 0.0125 °C/W anode-side), and surge capability (IFSM = 32 kA, 10 ms) under asymmetric fault conditions.

Technical Context

This diode employs a planar, diffusion-controlled silicon structure optimized for controlled reverse recovery with low Qr and moderate di/dt tolerance. Its on-state behavior follows a four-term logarithmic I–V model (A = –1.712, B = 0.000708, C = 0.688, D = –0.0566) valid at Tvj = 140 °C, enabling accurate conduction loss calculation in high-current DC links.

Thermal design relies on two-sided forced cooling: junction-to-case resistance is asymmetric-0.0125 °C/W (anode), 0.0228 °C/W (cathode)-requiring matched heatsink contact pressure (27–45 kN) and interface thermal resistance ≤ 0.003 °C/W per side to maintain Tvj ≤ 140 °C at IFAVM = 1380 A (85 °C case).

Key Specifications

Pinout & Package

Package: Press-pack, double-sided cooled, stud-mount diode with 100 mm diameter copper baseplate and two M6 mounting holes. Requires uniform clamping force of 27–45 kN across both anode and cathode interfaces.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage fast rectifier applications.

Compared with D291S45T and DD430N45K, D1381S45TXPSA1 offers optimal balance of conduction loss (vF = 2.6 V), thermal resistance (0.0125 °C/W), and recovery speed (Qr = 2800 µAs), making it preferred for legacy 50 Hz traction and industrial rectifier upgrades where footprint and clamping geometry are fixed.

Availability

D1381S45TXPSA1 is available at Aetrix Electronics and suitable for railway traction converters, industrial HVDC rectifiers, medium-voltage VFD front-ends, and renewable energy grid inverters requiring stable component supply over extended production lifecycles.

Supply support for D1381S45TXPSA1 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 press-pack thyristor and diode technology for industrial and traction markets.

D1381S45TXPSA1 belongs to eupec's S-series fast recovery diode family, engineered specifically for line-commutated converters in rail and heavy industry where reliability under sustained high dv/dt and di/dt stress is critical.

FAQ

What is the recommended clamping force for D1381S45TXPSA1 installation?

The datasheet specifies a mandatory clamping force range of 27–45 kN applied uniformly across both anode and cathode studs. Deviation below 27 kN risks thermal runaway due to increased RthCK; exceeding 45 kN may deform the ceramic insulator or damage the copper baseplate. Torque must be applied in alternating sequence across both mounting holes using calibrated tools.

Can D1381S45TXPSA1 be paralleled with other diodes for higher current capacity?

Yes, but only with strict matching: units must be from the same wafer lot, have identical vF (±2% at 2500 A), and share a common heatsink with symmetric thermal paths. Parallel strings require individual current-sharing inductors (≥2 µH) and gate-controlled triggering synchronization to avoid dynamic current imbalance during turn-on.

Is D1381S45TXPSA1 compliant with RoHS or REACH regulations?

As a pre-2001 eupec device, D1381S45TXPSA1 predates RoHS Directive 2002/95/EC and contains lead-based solder in internal interconnects. Infineon confirms it is not RoHS-compliant; however, exemptions under Annex III apply for high-reliability industrial and traction applications per EU Directive 2011/65/EU.

What is the maximum allowable case temperature for continuous operation?

The datasheet defines two mean forward current ratings: IFAVM = 1380 A at tC = 85 °C and 1630 A at tC = 70 °C. Continuous operation above 85 °C case temperature is not rated; junction temperature must remain ≤ 140 °C, requiring heatsink design that maintains tC ≤ 85 °C under worst-case ambient and airflow conditions.