Infineon Technologies TT122N18KOFHPSA1

Overview

TT122N18KOFHPSA1 from Semikron is a phase-control thyristor module with dual anti-parallel SCR configuration, rated for 122 A average on-state current at TC = 85 °C and 1800 V repetitive peak off-state voltage (VDRM/VRRM), designed for industrial AC power control in medium-power rectifier and motor drive systems.

For engineers reviewing the TT122N18KOFHPSA1 datasheet, TT122N18KOFHPSA1 pinout, TT122N18KOFHPSA1 application, or TT122N18KOFHPSA1 equivalent, key selection criteria include critical dv/dt rating (500–1000 V/µs), surge current capability (3300 A @ 10 ms), thermal resistance (0.096 °C/W junction-to-case per arm), and gate trigger requirements (IGT ≤ 200 mA, VGT ≤ 2 V).

Technical Context

This thyristor module implements a press-pack, double-sided cooled design with AlN ceramic isolation and silicon pellets under mechanical pressure contact. It supports forced- and natural-cooled operation with transient thermal impedance ZthJC characterized for sinusoidal and rectangular conduction angles.

The device operates in line-commutated switching mode with circuit commutated turn-off time (tq) of 300 µs typical at Tvj max, requiring external snubbers for dv/dt protection above 500 V/µs and gate drive circuits compliant with IEC 747-6 for reliable triggering and non-trigger immunity.

Key Specifications

Pinout & Package

TT122N18KOFHPSA1 uses a press-pack, double-sided cooled module package with isolated copper baseplate and integrated AlN ceramic insulation. Mechanical mounting uses M1 screws (6 Nm ±15%) and electrical 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 SKKT 105/16 E and TT162N16KOFHPSA1, TT122N18KOFHPSA1 offers optimal balance of 1800 V blocking, 122 A continuous rating, and compact thermal resistance (0.096 °C/W), making it ideal for standardized 690 VAC industrial drives where reliability and thermal margin are prioritized over peak surge headroom.

Availability

TT122N18KOFHPSA1 is available at Aetrix Electronics and suitable for industrial motor soft-start, medium-voltage HVAC chiller control, and DC power supply for electroplating requiring stable component supply across multi-year production programs.

Supply support for TT122N18KOFHPSA1 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

Semikron is a German power semiconductor manufacturer specializing in high-reliability modules for industrial, energy, and traction applications since 1951.

This part belongs to Semikron's TT-series phase-control thyristor modules, engineered for ruggedized AC power control in harsh environments including factory automation, marine propulsion, and renewable energy converters.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum allowable case temperature (TC) is not fixed but depends on current loading and cooling method. At ITAVM = 122 A with natural cooling, TC must not exceed 85 °C; with forced cooling, TC may reach 125 °C while maintaining Tvj ≤ 125 °C, as defined by the RthJC = 0.096 °C/W rating and thermal modeling in the datasheet's ZthJC curves.

Does TT122N18KOFHPSA1 require external snubbers?

Yes - due to its critical dv/dt rating of 500–1000 V/µs, external RC snubbers are mandatory in most applications. The datasheet specifies snubber design parameters based on load inductance, line frequency, and expected voltage transients; omission risks spurious turn-on during voltage recovery in B6 rectifier or phase-control circuits.

Can this module be used in parallel configurations?

No - the TT122N18KOFHPSA1 is not characterized or recommended for paralleling. Its dynamic parameters (e.g., tq = 300 µs, (diT/dt)cr = 100 A/µs) vary between units, and the press-pack construction lacks built-in current-sharing features. Parallel operation would require individual gate timing compensation and current-balancing reactors, which are not supported by the module's design or qualification.

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

A minimum gate trigger voltage of 2 V and current of 200 mA must be delivered within 4 µs (tgd max) to ensure turn-on under worst-case conditions (Tvj = 25 °C, vD = 6 V). Gate drivers must also sustain ≥1200 mA latching current (IL) briefly after initiation and provide ≥300 mA holding current (IH) to maintain conduction during low-load phases.