Infineon Technologies T3800N18TOFVTXPSA1

Overview

T3800N18TOFVTXPSA1 from Infineon Technologies is a high-power phase-control thyristor designed for medium-voltage AC line commutated rectification and soft-start applications. It delivers 3800 A average on-state current (ITAVM) at TC = 85 °C, 1800 V repetitive peak off-state voltage (VRRM), and withstands 67 kA non-repetitive surge current (ITSM) - enabling robust operation in industrial drive rectifiers and medium-voltage converters.

For engineers reviewing the T3800N18TOFVTXPSA1 datasheet, T3800N18TOFVTXPSA1 pinout, T3800N18TOFVTXPSA1 application, or T3800N18TOFVTXPSA1 equivalent, key selection criteria include clamping force range (42–95 kN), two-sided thermal resistance (RthJC = 7.8 K/kW), gate trigger current ≤250 mA, and critical dv/dt rating of 1000 V/µs under full junction temperature.

Technical Context

This thyristor operates as a line-commutated, gate-controlled power switch in half- or full-wave AC phase control topologies. Its design supports sinusoidal conduction angles up to 180° and rectangular waveforms with θ ≥ 30°, with validated transient thermal impedance (ZthJC) models for anode-, cathode-, and two-sided cooling configurations.

It features a pressure-contact silicon pellet structure requiring mechanical clamping, not soldered mounting. Gate triggering follows IEC 60747-6 standards with defined latching (IL ≤ 1500 mA) and holding (IH ≤ 300 mA) currents, and exhibits controlled turn-off behavior (tq typ. 250 µs) under specified commutation conditions (vRM = 100 V, dvD/dt = 20 V/µs).

Key Specifications

Pinout & Package

Package: Two-sided cooled, press-pack thyristor with isolated anode/cathode terminals and flat gate terminal. Diameter: 111 mm; height: 26.5 mm; contact diameter: 75 mm; weight: ~1200 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TT1700N18KOF and T5800N18TOF, the T3800N18TOFVTXPSA1 provides optimal balance of current rating, thermal performance, and mechanical compatibility in standard 111 mm press-pack stacks - avoiding overdesign while supporting full-rated operation in 3.3 kV medium-voltage drives.

Availability

T3800N18TOFVTXPSA1 is available at Aetrix Electronics and suitable for medium-voltage rectifiers, AC motor soft starters, DC traction power supplies, and reactive power compensation systems requiring stable component supply, long-life field reliability, and traceable industrial-grade sourcing.

Supply support for T3800N18TOFVTXPSA1 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 sensor solutions for industrial, automotive, and energy applications.

This part belongs to Infineon's "Netz-Thyristor" product line, engineered specifically for high-power, line-commutated AC/DC conversion in utility-scale and heavy-industrial systems where ruggedness, thermal stability, and surge immunity are paramount.

FAQ

What is the recommended clamping force range for T3800N18TOFVTXPSA1?

The device requires a mechanical clamping force between 42 kN and 95 kN to ensure proper thermal contact, low interfacial resistance, and uniform current distribution across the silicon pellet. Exceeding 95 kN risks ceramic insulator fracture, while forces below 42 kN increase RthJC and risk hot-spot formation under full-load operation.

Does T3800N18TOFVTXPSA1 support forced-air or liquid cooling?

Yes - its two-sided cooling architecture supports both forced-air and liquid-cooled heatsinks, provided thermal interface materials meet Infineon's specification for hardness (Shore A 30–50) and thickness (0.1–0.15 mm). Thermal performance data in the datasheet assumes symmetric, high-conductivity interface layers on both anode and cathode sides.

Can T3800N18TOFVTXPSA1 be used in asymmetrical half-wave configurations?

No - this thyristor is optimized for symmetrical, full-wave or six-pulse line-commutated operation. Asymmetrical half-wave use causes uneven thermal cycling and violates the validated ZthJC model, leading to premature junction fatigue. It must be operated with balanced conduction angles and matched complementary devices in bridge legs.

What gate drive circuit parameters are mandatory for reliable triggering?

A gate pulse with peak current ≥500 mA (2× IGT max), width ≥20 µs, and diG/dt ≥1 A/µs is required to ensure uniform turn-on across the entire silicon area. The gate circuit must also limit peak gate power to ≤60 W (per 0.5 ms pulse) and provide <0.25 V non-trigger voltage (VGD) under blocking conditions to prevent spurious conduction.