Infineon Technologies TD780N18KOFXPSA1

Overview

TD780N18KOFXPSA1 from Infineon Technologies is a pressure-contact, dual-arm phase-control thyristor module rated for 1800 V repetitive peak off-state voltage (VDRM/VRRM), 775 A average on-state current at TC = 85°C (ITAVM), and 23.5 kA non-repetitive surge current (ITSM). It features electrically insulated baseplate, pre-applied thermal interface material (TIM), and is designed for high-reliability industrial power control in soft starters and UPS rectifiers.

For engineers reviewing the TD780N18KOFXPSA1 datasheet, TD780N18KOFXPSA1 pinout, TD780N18KOFXPSA1 application, or TD780N18KOFXPSA1 equivalent, key selection criteria include junction-to-case thermal resistance (0.045 K/W per arm), critical dv/dt rating (1000 V/µs), gate trigger current (≤250 mA), and isolation test voltage (3.6 kV for 1 sec).

Technical Context

This dual-thyristor module implements phase-angle control in AC line-commutated applications using pressure-contact silicon die technology. Its 135°C maximum junction temperature, 0.285 mΩ slope resistance (rT), and 250 µs typical turn-off time (tq) support robust operation under high-current, high-dv/dt conditions in drive rectifiers and crowbar circuits.

The module integrates two independent thyristor arms in an industrial-standard package with basic insulation (IEC 61140 Class 1) and 19 mm creepage distance. Thermal performance is optimized via low RthJC (0.045 K/W per arm) and optional TIM, enabling stable conduction at ITAVM up to 775 A with case temperature limited to 85°C.

Key Specifications

Pinout & Package

TD780N18KOFXPSA1 uses an industrial-standard pressure-contact module package with isolated copper baseplate (60 mm × 60 mm footprint), M1 mechanical mounting screws (6 Nm torque), and M2 terminal screws (12 Nm torque) for main terminals. Control terminals conform to DIN 46244 A (2.8 × 0.8 mm flat blade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TT780N18KOF and TD780N16KO, TD780N18KOFXPSA1 delivers superior thermal assembly reliability via pre-applied TIM and higher system-level robustness through 1800 V blocking and 1000 V/µs dv/dt immunity-critical for mission-critical UPS and drive applications.

Availability

TD780N18KOFXPSA1 is available at Aetrix Electronics and suitable for soft starters, UPS rectifiers, static switches, and crowbar protection circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.

Supply support for TD780N18KOFXPSA1 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 industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

This part belongs to Infineon's High-Power Thyristor Module product line, engineered specifically for ruggedized, high-current phase-control applications in industrial motor drives, energy conversion, and grid-tied power systems.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum allowable case temperature (Tc op) is +135°C, but the rated average on-state current (ITAVM = 775 A) is specified at TC = 85°C. Operation above 85°C requires derating per the TC = f(ITAVM) curve on page 7 of the datasheet, with full current permitted only if heatsink design maintains case temperature ≤85°C under worst-case ambient and airflow conditions.

Can TD780N18KOFXPSA1 be used in a single-phase full-wave rectifier?

Yes-it supports single-phase full-wave (B2) configurations using one arm, with ITAVM derated to 550 A at TC = 85°C per the "180 rec" curve on page 7. The module's dual-arm structure allows flexible use in B2, B6, or back-to-back arrangements; gate terminals G1/K1 and G2/K2 must be driven independently with proper isolation.

Is the baseplate electrically isolated from all terminals?

Yes-the baseplate features AlN ceramic insulation rated for 3.6 kV RMS (1 sec) per IEC 61140 Class 1, fully isolating it from A1, K1, A2, K2, G1, and G2 terminals. This enables direct mounting to grounded heatsinks without additional insulating hardware, simplifying mechanical design and improving thermal performance.

What gate drive voltage and current are required for reliable turn-on?

A minimum gate trigger voltage of 2 V and current of 250 mA (at vD = 12 V, Tvj = 25°C) ensures turn-on; however, design margins recommend 15–20 V pulses with ≥500 mA peak current and ≤4 µs delay (tgd). Gate resistors must limit di/dt to avoid false triggering, and floating isolated drivers are mandatory due to independent cathode references (G1/K1, G2/K2).