Infineon Technologies T640N16TOFXPSA1

Overview

T640N16TOFXPSA1 from Infineon Technologies is a high-power phase-control thyristor designed for industrial AC power regulation in line-commutated converters, motor drives, and static VAR compensators. It delivers 644 A average on-state current at 85 °C case temperature, 1600 V repetitive peak off-state voltage (VDRM/VRRM), and withstands 9400 A non-repetitive surge current (10 ms, Tvj = 25 °C). Its 0.039 °C/W junction-to-case thermal resistance supports two-sided forced cooling in high-efficiency rectifier stacks.

For engineers reviewing the T640N16TOFXPSA1 datasheet, T640N16TOFXPSA1 pinout, T640N16TOFXPSA1 application, or T640N16TOFXPSA1 equivalent, key selection criteria include verified gate trigger current (≤250 mA), critical dv/dt rating (1000 V/µs), commutated turn-off time (250 µs typ.), and clamping force requirements (6–12 kN) for pressure-contact mounting.

Technical Context

This thyristor operates as a line-synchronized, gate-controlled unidirectional switch in half-wave or full-wave controlled rectifier topologies. It features a silicon pellet with pressure-contact construction, requiring precise mechanical clamping to maintain thermal and electrical integrity under 1450 A RMS conduction and 442 kA²s I²t surge capability.

Its triggering behavior is defined by gate threshold voltage (0.8 V), latching current (1200 mA), and holding current (300 mA) at 25 °C, with gate non-trigger limits ensuring immunity to false turn-on under high dv/dt (≤0.25 V gate non-trigger voltage at 0.5×VDRM). The 200 A/µs critical di/dt rating enables robust turn-on under inductive loads.

Key Specifications

Pinout & Package

Package: TO-200AB (isolated stud mount, pressure-contact Si pellet), 110 g mass, 6 mm creepage distance, clamping force 6–12 kN. Terminals are mechanically defined: Anode (flat surface), Cathode (flat surface), Gate (flat terminal), Auxiliary Cathode (optional low-inductance cathode path).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TT640N16KOF and T640N16TOF, the T640N16TOFXPSA1 provides unique auxiliary cathode access for low-inductance gate drive and tighter di/dt control-critical in high-dynamic-response SVCs and traction rectifiers where commutation reliability is non-negotiable.

Availability

T640N16TOFXPSA1 is available at Aetrix Electronics and suitable for industrial motor drives, static VAR compensators, DC traction rectifiers, and medium-voltage UPS systems requiring stable component supply across multi-year production cycles.

Supply support for T640N16TOFXPSA1 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 infrastructure markets.

This part belongs to Infineon's "Netz-Thyristor" high-power phase-control thyristor product line, engineered specifically for line-commutated AC/DC conversion in utility-scale power electronics where reliability under extreme thermal and electrical stress is mandatory.

FAQ

What is the required gate trigger pulse specification for reliable turn-on?

The T640N16TOFXPSA1 requires a minimum gate trigger current of 1 A with di/dt ≥ 1 A/µs and pulse width ≥ 20 µs to ensure latching at all operating temperatures. At 25 °C, 250 mA is sufficient, but design margin mandates ≥1 A pulses for guaranteed turn-on under worst-case junction temperature (125 °C) and voltage drop (VGT ≤ 2.2 V).

Can this thyristor be used in anti-parallel configuration for AC switching?

Yes-T640N16TOFXPSA1 is routinely paired anti-parallel for bidirectional AC phase control. Its symmetrical VDRM/VRRM (1600 V) and matched thermal characteristics allow balanced current sharing. Mounting must ensure identical clamping force and thermal resistance on both devices to prevent current imbalance and premature failure.

What is the maximum allowable case temperature under continuous 644 A operation?

At ITAV = 644 A with sinusoidal conduction (θ = 180°) and two-sided cooling, the maximum allowable case temperature is 85 °C per datasheet rating. Exceeding this requires derating: at 100 °C case, ITAV drops to ~480 A (see Fig. 6, page 6 of datasheet), enforced by thermal monitoring of heatsink baseplate.

Is auxiliary cathode connection mandatory for normal operation?

No-the auxiliary cathode is optional and intended only for high-di/dt applications requiring minimized gate loop inductance. Standard operation uses main cathode and gate terminals. The auxiliary cathode must not be left floating; if unused, it should be shorted to the main cathode to avoid parasitic coupling or EMI issues.