Infineon Technologies TZ425N12KOFHPSA1

Overview

TZ425N12KOFHPSA1 from Infineon Technologies is a phase-control thyristor module rated for 1200 V repetitive peak off-state voltage (VDRM/VRRM), 425 A average on-state current at TC = 85°C (ITAVM), and 14.5 kA non-repetitive surge current (ITSM). It uses pressure-contact silicon pellet technology with electrically insulated AlN baseplate, and is designed for high-power industrial rectification and soft-start applications.

For engineers reviewing the TZ425N12KOFHPSA1 datasheet, TZ425N12KOFHPSA1 pinout, TZ425N12KOFHPSA1 application, or TZ425N12KOFHPSA1 equivalent, key selection criteria include junction-to-case thermal resistance (0.078 K/W), threshold voltage (0.9 V), slope resistance (0.3 mΩ), critical dv/dt rating (1000 V/µs), and gate trigger current (≤250 mA).

Technical Context

This thyristor module implements a dual-arm, press-pack construction with electrically isolated ceramic (AlN) baseplate and direct copper bonding. It supports forced- or natural-cooled operation with validated thermal impedance models (ZthJC, ZthCA) for transient thermal design under sinusoidal or rectangular conduction angles.

It operates in line-commutated mode with 250 µs typical turn-off time (tq) at full-rated current and 100 V reverse recovery voltage. Gate control requires ≤1.5 V trigger voltage and ≥1 A gate pulse current to ensure reliable latching (IL ≤ 1500 mA) and holding (IH ≤ 300 mA) under specified di/dt and dv/dt conditions.

Key Specifications

Pinout & Package

Package: Press-pack, industrial standard housing with electrically insulated AlN baseplate, 50 mm baseplate dimension, M1 mechanical mounting (5 Nm), M2 terminal torque (12 Nm), weight 900 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar phase-control thyristor module applications.

Compared with TT175N12KOFHPSA1 and TZ630N12KOFHPSA1, TZ425N12KOFHPSA1 provides optimal balance of current rating, thermal performance (0.078 K/W), and surge capability (14.5 kA) for mid-range industrial power control-avoiding overspecification while maintaining margin for transient overload.

Availability

TZ425N12KOFHPSA1 is available at Aetrix Electronics and suitable for soft starters, drive rectifiers, crowbar protection circuits, and static switches requiring stable component supply and long-term industrial lifecycle support.

Supply support for TZ425N12KOFHPSA1 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 semiconductors, microcontrollers, and automotive ICs, with global manufacturing and R&D infrastructure.

This part belongs to Infineon's high-power thyristor module product line, engineered for ruggedized industrial power conversion, motor control, and grid-connected protection systems where reliability under thermal and electrical stress is critical.

FAQ

What is the maximum allowable junction temperature for TZ425N12KOFHPSA1?

The maximum junction temperature (Tvj max) is 125°C, as specified in the datasheet's thermal properties section. This limit must be respected in thermal design to avoid permanent degradation of the silicon die or pressure-contact interface. Derating curves for ITAVM versus case temperature confirm operation down to TC = –40°C and up to TC = 125°C, with full 425 A rating only at TC = 85°C.

Does TZ425N12KOFHPSA1 require external snubbers?

Yes-snubbers are recommended due to its 1000 V/µs critical dv/dt rating. While the device tolerates this rate under ideal conditions, real-world line transients and commutation spikes often exceed it. A properly designed RC snubber across each arm limits dv/dt during turn-off and prevents false triggering, especially in inductive load applications like motor drives.

Can TZ425N12KOFHPSA1 be used in anti-parallel configuration?

Yes-its dual-arm structure (A1/K1 and A2/K2) supports anti-parallel connection for AC switching applications. Each arm operates independently, allowing one arm to conduct positive half-cycles and the other negative half-cycles. Gate signals must be isolated and timed to prevent shoot-through, and thermal coupling between arms must be accounted for in heatsink design.

What is the creepage distance and insulation test voltage?

The creepage distance is 15 mm, and the insulation test voltage is 3.0 kV RMS (1 minute) or 3.6 kV RMS (1 second), per the datasheet's mechanical properties table. These values reflect the AlN baseplate's high-dielectric-strength isolation and validate compliance with IEC 61800-5-1 for drive system safety requirements.