Infineon Technologies STT1900N18P55XPSA2

Overview

STT1900N18P55XPSA2 from Infineon Technologies is a pressure-contact soft starter module integrating two anti-parallel thyristor arms in a single housing, rated for 1800 V repetitive peak off-state voltage (VDRM/VRRM), 1900 A 21-second overload current, and 17,000 A non-repetitive surge current (ITSM). It features an integrated optimized heatsink, AMPT (Advanced Medium Power Technology), and operates up to 155 °C junction temperature after start.

For engineers reviewing the STT1900N18P55XPSA2 datasheet, STT1900N18P55XPSA2 pinout, STT1900N18P55XPSA2 application, or STT1900N18P55XPSA2 equivalent, this module is selected for high-reliability industrial motor soft-starting, static switching, and bypass control where thermal robustness, high di/dt immunity (250 A/µs), and low on-state resistance (0.28 mΩ) are critical.

Technical Context

This module implements a dual-arm, anti-parallel thyristor configuration with pressure-contact die attachment for low parasitic inductance and stable thermal performance under high-current transients. Its gate trigger characteristics (IGT ≤ 200 mA, VGT ≤ 2 V) and critical dv/dt rating (1000 V/µs) support reliable firing in noisy industrial AC line environments.

The thermal design integrates transient junction-to-reference (RthJR ≤ 0.029 K/W per arm) and junction-to-ambient (RthJA ≤ 0.084 K/W per module) resistances validated for 21 s overload duty. The module's 1300 g mass and M6 terminal torque (10 Nm ±10%) reflect its mechanical readiness for bolt-down mounting in cabinet-based power control systems.

Key Specifications

Pinout & Package

STT1900N18P55XPSA2 uses a pressure-contact, double-sided cooled module package with isolated copper baseplate (see Infineon Annex Page 4). Electrical terminals: two main power terminals (T1/T2) per arm, plus four gate control terminals (G1/K1/G2/K2) conforming to DIN 46244 A (2.8 × 0.8 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar soft starter module applications.

Compared with STT1600N18P55XPSA2, the STT1900N18P55XPSA2 delivers +18.8% overload headroom without footprint change; versus STT1900N18P55XPSA1, it reduces thermal interface complexity and improves long-term thermal stability by eliminating TIM degradation risk.

Availability

STT1900N18P55XPSA2 is available at Aetrix Electronics and suitable for industrial motor soft starters, static transfer switches, bypass switching systems, and medium-power AC controllers requiring stable component supply and long-lifecycle support.

Supply support for STT1900N18P55XPSA2 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 markets.

This part belongs to Infineon's Soft Starter Module product line, engineered specifically for high-reliability, high-current AC power control in harsh industrial environments where thermal resilience and pressure-contact robustness are mandatory.

FAQ

What is the maximum allowable gate trigger pulse width for STT1900N18P55XPSA2?

The absolute maximum single-pulse gate power dissipation is 150 W for 0.1 ms (curve "d" in Fig. 8), corresponding to a 15 A, 10 V pulse. For continuous triggering, average gate power must stay below 0.5 W. Pulse width beyond 100 µs requires proportional reduction in amplitude to avoid exceeding PGM limits.

Can STT1900N18P55XPSA2 be operated with forced-air cooling only?

No - this module requires conductive cooling via bolt-down to a heatsink. Its RthJA rating (0.084 K/W) assumes a minimum 3.6 m/s airflow *across* a properly sized external heatsink. Relying solely on ambient air or convection will exceed thermal limits even at 50% load due to insufficient heat extraction from the baseplate.

Is the gate control interface electrically isolated between arms?

No - G1/K1 and G2/K2 share a common reference plane on the module baseplate. Full galvanic isolation requires separate isolated gate drivers with reinforced insulation (≥5 kV RMS) and independent floating power supplies for each arm to prevent cross-talk and latch-up.

What is the creepage distance and why does it matter for STT1900N18P55XPSA2?

The creepage distance is 6.3 mm between main terminals, verified per IEC 61800-5-1. This ensures safe operation at 1800 V blocking voltage in pollution degree 3 environments (industrial dust/moisture), preventing surface tracking failure during humidity or contamination exposure.