Infineon Technologies TD425N18KOFHPSA2

Overview

TD425N18KOFHPSA2 from Infineon Technologies is a pressure-contact thyristor module for phase-controlled AC power regulation in industrial drive rectifiers, soft starters, and crowbar protection circuits. It delivers 471 A average on-state current at 85 °C case temperature, supports up to 1800 V repetitive peak off-state voltage (VDRM/VRRM), and features 0.35 mΩ slope resistance with electrically insulated baseplate.

For engineers reviewing the TD425N18KOFHPSA2 datasheet, TD425N18KOFHPSA2 pinout, TD425N18KOFHPSA2 application, or TD425N18KOFHPSA2 equivalent, key selection criteria include junction-to-case thermal resistance (0.065 K/W), critical dv/dt rating (1000 V/µs), gate trigger current (≤250 mA), and 125 °C maximum junction temperature under continuous conduction.

Technical Context

This dual-thyristor module implements phase-angle control in high-power AC/DC conversion topologies including B2 two-pulse and B6 six-pulse bridge configurations. Its pressure-contact silicon pellet construction enables robust thermal cycling performance and stable conduction characteristics across -40 °C to +125 °C operating range.

The device operates with gate-controlled delay time ≤4 µs and circuit-commutated turn-off time of 250 µs (typ.) at full-rated current. It maintains electrical isolation (3.6 kV RMS, 1 sec) between terminals and baseplate, supporting safe integration into grounded-heatsink systems.

Key Specifications

Pinout & Package

TD425N18KOFHPSA2 uses an industry-standard press-pack module package with electrically insulated baseplate (AlN ceramic), 60 mm × 60 mm footprint, and M1 (6 Nm) mechanical mounting torque. Terminal connections follow DIN 46244 A standard (2.8 × 0.8 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TT425N18KOFHPSA2, TD425N18KOFHPSA2 adds full DMX traceability without electrical or thermal trade-offs; versus SKKT425/18E, it provides 13% lower junction-to-case thermal resistance and 21% higher surge current rating-critical for high-reliability industrial rectifiers and crowbar systems.

Availability

TD425N18KOFHPSA2 is available at Aetrix Electronics and suitable for industrial soft starters, drive rectifiers, UPS systems, and static switch applications requiring stable component supply, long-term lifecycle support, and full production traceability.

Supply support for TD425N18KOFHPSA2 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 electronics, automotive ICs, and security solutions, with global manufacturing and R&D centers.

This part belongs to Infineon's Thyristor Module product line, engineered for high-power industrial AC control applications including motor drives, energy conversion, and grid-connected power systems.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum case temperature (TC) for continuous operation is +125 °C, as defined by the absolute maximum junction temperature (Tvj max = 125 °C) and thermal resistance RthJC = 0.065 K/W. Operation above this temperature risks irreversible degradation of the pressure-contact interface and gate oxide integrity.

Does TD425N18KOFHPSA2 require external snubbers?

Yes-due to its 1000 V/µs critical dv/dt rating, external RC snubbers are mandatory for inductive loads or long cable runs. Snubber design must limit transient dv/dt across A-K terminals to below this threshold during commutation to prevent false triggering.

Can TD425N18KOFHPSA2 be used in single-phase applications?

Yes-it supports single-phase B2 two-pulse bridge configurations. The dual-arm structure allows use in single-phase rectifiers, soft starters, and static switches; derating curves in the datasheet specify ITAVM vs. conduction angle (e.g., 471 A at 180°, 300 A at 90°) for accurate single-phase design.

What is the meaning of 'KOFHPSA2' in the part number?

'KOFHPSA2' encodes key specifications: K = 1800 V VDRM/VRRM, O = 250 µs turn-off time, F = 1000 V/µs dv/dt rating, H = insulated baseplate, P = pressure contact, SA2 = customer-specific DMX traceability format per Infineon's short-form catalog.