Infineon Technologies STT1400N16P55HPSA1

Overview

STT1400N16P55HPSA1 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 blocking voltage (VDRM/VRRM), 1300 A 21-second overload current, and 10.5 kA non-repetitive surge current (ITSM). It features an integrated optimized heatsink, AMPT (Advanced Medium Power Technology), and is designed for industrial motor soft-start and bypass switching applications.

For engineers reviewing the STT1400N16P55HPSA1 datasheet, STT1400N16P55HPSA1 pinout, STT1400N16P55HPSA1 application, or STT1400N16P55HPSA1 equivalent, key selection criteria include its 0.49 mΩ slope resistance, 0.9 V threshold voltage, 250 µs turn-off time, 1000 V/µs critical dv/dt rating, and thermal resistance of 0.118 K/W (RthJA, 21 s).

Technical Context

This module implements a dual-thyristor, anti-parallel configuration enabling bidirectional AC conduction control without external reverse-blocking components. Its pressure-contact die attachment ensures low parasitic inductance and stable thermal performance under high di/dt (250 A/µs) and dv/dt (1000 V/µs) stress.

Thermal design relies on direct junction-to-reference-point (RthJR = 0.047 K/W) and junction-to-ambient (RthJA = 0.118 K/W, 21 s) paths, validated for sinusoidal conduction angles up to 180° and peak junction temperature of 155°C during start-up transients.

Key Specifications

Pinout & Package

STT1400N16P55HPSA1 uses a pressure-contact, double-sided cooled module package with isolated copper baseplate (see Infineon Annex drawing). Electrical terminals are M6 screw connections for main power (T1/T2) and DIN 46244 A-style flat terminals (2.8 × 0.8 mm) for gate control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STT1400N16P55HPSA1, the HPSA2 variant offers identical performance with enhanced batch traceability, while the STT1200N16P55HPSA1 trades 100 A overload headroom for marginally lower cost-both retain the same pressure-contact construction, AMPT silicon, and heatsink integration.

Availability

STT1400N16P55HPSA1 is available at Aetrix Electronics and suitable for industrial motor soft starters, static bypass switches, and medium-power AC power controllers requiring stable component supply, long-life thermal reliability, and certified 1600 V isolation.

Supply support for STT1400N16P55HPSA1 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 automotive, industrial, and energy markets.

This part belongs to Infineon's Soft Starter Module (SSM) product line, engineered specifically for high-reliability, maintenance-free AC motor starting and static switching in harsh industrial environments.

FAQ

What is the maximum allowable gate trigger voltage for STT1400N16P55HPSA1?

The maximum gate trigger voltage (VGT) is 2 V at Tvj = 25°C, vD = 12 V, per the official Infineon technical information sheet revision 3.3. Exceeding this may cause premature gate oxide stress or inconsistent turn-on behavior. Gate drive circuits must be designed to clamp voltage within this limit using Zener diodes or active regulation, especially under high-temperature conditions where leakage increases.

Can STT1400N16P55HPSA1 be used in single-phase applications?

Yes-it is explicitly designed for single-phase AC soft starting and bypass switching. Its dual anti-parallel thyristor architecture provides full-wave conduction control across line and neutral or line-to-line configurations. The module's 1600 V VDRM rating supports 1000 VAC systems with safety margin, and its 1300 A overload rating covers typical single-phase motor inrush currents up to 150 kW.

What is the recommended terminal torque for main power connections?

The specified terminal connection torque for M6 main power terminals is 10 Nm, with a ±10% tolerance. This value ensures optimal contact pressure for low-resistance current transfer and thermal stability under 1300 A overload conditions. Under-torquing risks localized heating and arcing; over-torquing may deform threads or damage the copper baseplate. Use a calibrated torque wrench and verify torque after thermal cycling.

Does STT1400N16P55HPSA1 require external snubber circuits?

Snubbers are not required for standard 50/60 Hz industrial mains operation due to its 1000 V/µs (dv/dt)cr rating and 250 A/µs (di/dt)cr capability-validated under AMPT design rules. However, snubbers are recommended when switching highly inductive loads (e.g., large transformers) or in systems with fast-rising voltage transients exceeding 600 V/µs, to prevent false triggering and ensure clean commutation during tq = 250 µs turn-off.