Infineon Technologies STT1900N16P55XPSA2

Overview

STT1900N16P55XPSA2 from Infineon Technologies is a pressure-contact soft starter module integrating two anti-parallel thyristor arms in a single housing, rated for 1600 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, 0.28 mΩ slope resistance (rT), and 0.9 V threshold voltage (VT0), designed for industrial motor soft-start and bypass switching applications.

For engineers reviewing the STT1900N16P55XPSA2 datasheet, STT1900N16P55XPSA2 pinout, STT1900N16P55XPSA2 application, or STT1900N16P55XPSA2 equivalent, key selection criteria include verified 21s thermal overload capability, junction-to-ambient thermal resistance of 0.084 K/W (21s), gate trigger current ≤200 mA, critical dv/dt rating of 1000 V/µs, and pressure-contact construction enabling high-cycle reliability in static power control systems.

Technical Context

This module implements a dual-arm, anti-parallel thyristor configuration with pressure-contact silicon pellets-enabling high-current commutation without wire bonding. Its design supports phase-controlled AC power regulation via gate-triggered conduction, with validated turn-off time (tq) of 250 µs under circuit-commutated conditions and critical di/dt rating of 250 A/µs.

Thermal performance is defined by transient junction-to-reference (RthJR) and junction-to-ambient (RthJA) resistances, both specified per arm and per module under DC and sinusoidal (180° conduction angle) conditions. The module operates up to 155 °C junction temperature after start and maintains stable gate triggering across -40 °C to +125 °C case temperature range.

Key Specifications

Pinout & Package

STT1900N16P55XPSA2 uses a pressure-contact, double-sided cooled module package with isolated copper baseplate (case material: AlSiC), dimensions 120 mm × 80 mm × 35 mm, weight ≈1300 g. Electrical terminals conform to M6 screw torque (10 Nm ±10%) for main power connections and DIN 46244 A (2.8 × 0.8 mm) for control terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STT1600N16P55XPSA2 and STT1900N18P55XPSA2, the STT1900N16P55XPSA2 uniquely balances 1900 A overload capacity with 1600 V blocking-making it optimal for standard 690 V industrial mains with demanding 21s ramp profiles, while avoiding unnecessary voltage derating or thermal oversizing.

Availability

STT1900N16P55XPSA2 is available at Aetrix Electronics and suitable for motor soft starters, static bypass switches, industrial power controllers, and static transfer switches requiring stable component supply, long-lifecycle support, and traceable production batches.

Supply support for STT1900N16P55XPSA2 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 R&D and manufacturing facilities.

This part belongs to Infineon's Soft Starter Module (SSM) product line, engineered specifically for high-reliability, medium-power AC motor control and static switching-emphasizing pressure-contact robustness, thermal predictability, and gate-drive simplicity in harsh industrial environments.

FAQ

What is the maximum allowable gate trigger voltage for STT1900N16P55XPSA2?

The maximum gate trigger voltage (VGT) is 2 V at Tvj = 25 °C, vD = 12 V. Exceeding this value risks premature gate oxide stress or uncontrolled turn-on. Gate drive circuits must be designed to clamp voltage at or below 2 V during triggering, with series resistance selected to limit peak current to ≤200 mA under worst-case conditions.

Can STT1900N16P55XPSA2 operate without forced air cooling?

Yes-it supports natural convection cooling when mounted on a ≥0.15 m² aluminum heatsink with ≥10 mm fin height, provided ambient temperature remains ≤40 °C and duty cycle limits average power dissipation to ≤350 W per arm. Thermal simulation using ZthJA analytical data (page 5) is required to validate junction temperature stays ≤125 °C under actual load profile.

How is the 21-second overload rating validated?

The 1900 A / 21 s rating is derived from validated thermal modeling using RthJA(21s) = 0.084 K/W and junction temperature limit of 155 °C after start. It assumes initial junction temperature of 40 °C, sinusoidal 180° conduction, and proper mounting torque (10 Nm) on a flat, thermally conductive surface. No derating is applied for altitude or enclosure effects.

What gate drive isolation voltage is required for reliable operation?

A minimum isolation voltage of 3.75 kV RMS (per IEC 60747-5-1) is required between gate terminals (G1/K1, G2/K2) and main terminals (T1–T4), due to the module's 1600 V blocking rating and potential common-mode transients in industrial environments. Optocoupler-based drivers with reinforced isolation (e.g., Infineon 1ED020I12FA) meet this requirement and provide <100 ns propagation delay.