Infineon Technologies TT780N18KOFHPSA1

Overview

TT780N18KOFHPSA1 from Infineon Technologies is a press-pack, double-sided cooled phase-control thyristor module rated for 1800 V repetitive peak off-state voltage (VDRM/VRRM), 775 A average on-state current (ITAVM at TC = 85°C), and 23.5 kA non-repetitive surge current (ITSM). It features electrically insulated baseplate, pre-applied thermal interface material (TIM), and Advanced Medium Power Technology (AMPT) for industrial power control in soft starters and static switches.

For engineers reviewing the TT780N18KOFHPSA1 datasheet, TT780N18KOFHPSA1 pinout, TT780N18KOFHPSA1 application, or TT780N18KOFHPSA1 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 pressure-contact construction enabling high reliability under cyclic thermal stress in drive rectifier and crowbar circuits.

Technical Context

This thyristor module implements a dual-arm, anti-parallel configuration optimized for phase-angle controlled AC power regulation. Its pressure-contact die attachment ensures low parasitic inductance and stable thermal performance across 135°C maximum junction temperature (Tvj max), with validated commutated turn-off time (tq = 250 µs typ.) and critical di/dt capability (200 A/µs).

Electrical isolation is achieved via AlN ceramic substrate (basic insulation per IEC61140 Class 1), supporting 3.6 kV RMS insulation test voltage (1 sec). The module operates across -40°C to +135°C case temperature range and delivers 1.35 V maximum on-state voltage at 1500 A, enabled by 0.285 mΩ slope resistance (rT) and 0.8 V threshold voltage (VT0).

Key Specifications

Pinout & Package

TT780N18KOFHPSA1 is housed in an industrial-standard press-pack module with electrically insulated 60 mm baseplate and dual-arm topology. Mechanical terminals follow DIN 46244 A (2.8 × 0.8 mm) for control leads and M2 (12 Nm torque) for main power connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TD780N18KOF and TT920N18KOF, TT780N18KOFHPSA1 uniquely balances dual-arm functionality, pre-applied TIM, and 775 A rating in a standard 60 mm baseplate-making it optimal for cost-sensitive, medium-power B2/B6 bridge designs where gate isolation and thermal repeatability are critical.

Availability

TT780N18KOFHPSA1 is available at Aetrix Electronics and suitable for soft starters, drive rectifiers, crowbar protection systems, and static switches requiring stable component supply, long-life thermal cycling performance, and certified industrial isolation.

Supply support for TT780N18KOFHPSA1 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 security solutions, with global manufacturing and R&D centers.

This part belongs to Infineon's high-power thyristor module product line, engineered specifically for robust, maintenance-free AC power control in industrial motor drives, UPS systems, and grid-tied energy infrastructure.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum allowable case temperature (TC op) is +135°C, aligned with the 135°C maximum junction temperature (Tvj max) and thermal resistance specification. Operation above this temperature risks irreversible degradation of the AlN insulation and pressure-contact interface, even if heatsink temperature appears within limits-thermal design must ensure TC remains ≤135°C under worst-case ITAVM loading and ambient conditions.

Does TT780N18KOFHPSA1 require external snubbers in B6 rectifier applications?

Yes-due to its 1000 V/µs critical dv/dt rating, external RC snubbers are required across each thyristor arm in B6 bridge configurations driving inductive loads (e.g., motor windings). Without snubbers, voltage transients exceeding (dvD/dt)cr can cause false triggering; typical design uses 0.1 µF/100 Ω per arm, verified against measured dv/dt during commutation.

Can the pre-applied TIM be reworked or replaced?

No-the thermal interface material is factory-applied and qualified for lifetime performance under thermal cycling; removal or reapplication voids the warranty and risks air gaps or uneven thickness, increasing RthCH beyond the specified 0.015 K/W per arm. If heatsink flatness exceeds 30 µm or surface roughness >1.6 µm Ra, consult Infineon Application Note AN2023-07 for approved interface validation protocols.

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

A minimum gate trigger voltage of 2 V (VGT max) and current of 250 mA (IGT max) at 25°C is required for guaranteed turn-on. Drive circuits must deliver ≥1 A peak pulse (iGM) with ≥1 A/µs diG/dt and ≤4 µs delay (tgd) to ensure robust triggering across temperature (-40°C to +125°C junction), especially under high dv/dt noise environments typical in drive cabinets.