Infineon Technologies TZ740N20KOFHPSA3

Overview

TZ740N20KOFHPSA3 from Infineon Technologies is a pressure-contact thyristor module for phase-controlled AC power regulation, featuring 2000 V repetitive peak off-state voltage (VDRM), 819 A average on-state current (ITAVM) at TC = 85°C, and 0.0405 K/W junction-to-case thermal resistance. It is designed for high-reliability industrial power control in soft starters, static switches, and drive rectifiers.

For engineers reviewing the TZ740N20KOFHPSA3 datasheet, TZ740N20KOFHPSA3 pinout, TZ740N20KOFHPSA3 application, or TZ740N20KOFHPSA3 equivalent, key selection criteria include its 30 kA surge current rating, pre-applied TIM option, electrically insulated base plate, and compatibility with B2/B6 bridge configurations under forced-air or liquid-cooled heatsinking.

Technical Context

This dual-thyristor phase-control module implements symmetrical gate-triggered conduction in each arm, supporting full-wave AC power control with critical di/dt capability of 200 A/µs and dv/dt immunity up to 1000 V/µs. Its pressure-contact silicon die construction eliminates wire bonds, enabling robust operation under high-current transients and thermal cycling.

The module integrates two identical thyristor arms in a single 70 mm × 146 mm industrial-standard package with isolated copper baseplate, rated for 125°C maximum junction temperature and compliant with IEC 61140 Class 1 basic insulation. Thermal performance is characterized by analytical ZthJC transient impedance data across seven RC network elements.

Key Specifications

Pinout & Package

Package: Industrial-standard 70 mm × 146 mm pressure-contact thyristor module with electrically insulated AlN-ceramic baseplate, M1 mounting screws (6 Nm), and M2 terminal screws (18 Nm). Weight: 1950 g. Creepage distance: 36 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TT740N20KOFHPSA3, TZ740N20KOFHPSA3 offers superior long-term thermal stability due to pressure-contact construction, while TZ740N22KOFHPSA3 extends reverse-blocking capability without compromising conduction or thermal performance-making both viable alternatives depending on lifetime or voltage-margin requirements.

Availability

TZ740N20KOFHPSA3 is available at Aetrix Electronics and suitable for soft starters, drive rectifiers, and static switches requiring stable component supply, long-life thermal cycling performance, and certified 3.0 kV isolation.

Supply support for TZ740N20KOFHPSA3 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 9001 and IATF 16949.

This part belongs to Infineon's "Netz-Thyristor-Modul" series, engineered specifically for high-power AC phase control in industrial motor drives, UPS systems, and energy conversion equipment where reliability under thermal and electrical stress is critical.

FAQ

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

TZ740N20KOFHPSA3 requires a minimum gate trigger current of 250 mA at 2 V (VGT max) with 1 A gate pulse current for guaranteed turn-on. Recommended gate drive uses 15–20 V pulses with ≥1 A peak current and <1 µs rise time to meet the 200 A/µs di/dt requirement and avoid false triggering under high dv/dt conditions.

Can this module be used in a B2 two-pulse bridge configuration?

Yes, TZ740N20KOFHPSA3 supports B2 operation with up to 1000 A RMS output current at 180° conduction angle. Its 819 A ITAVM rating and 0.0405 K/W RthJC allow full utilization in air-cooled B2 rectifiers delivering up to 1.2 MW per module pair when paired with appropriate heatsinking and forced airflow.

Is the pre-applied TIM compatible with standard thermal greases?

No-the pre-applied TIM is a proprietary phase-change material optimized for 0.010 K/W RthCH performance and must not be removed or overlaid. If TIM is damaged or absent, Infineon specifies using only approved thermal pastes (e.g., Dow Corning TC-5122) applied at 0.1 mm thickness to maintain RthCH ≤ 0.015 K/W.

What is the maximum allowable case temperature for continuous operation?

The maximum allowable case temperature is 125°C, derived from the 125°C Tvj max rating and RthJC = 0.0405 K/W. At 819 A ITAVM, total conduction loss is ~670 W per arm, requiring RthCH + RthHA ≤ 0.094 K/W to maintain TC ≤ 125°C-achievable with liquid cooling or high-performance forced-air heatsinks.