Infineon Technologies STT1400N16P55XPSA1

Overview

STT1400N16P55XPSA1 from Infineon Technologies is a pressure-contact soft starter module integrating two anti-parallel thyristor arms in a single housing for controlled AC motor starting. It delivers 1600 V repetitive blocking voltage, 1300 A 21-second overload current, and 10.5 kA 10 ms surge rating, with integrated optimized heatsink and 0.49 mΩ slope resistance. It is deployed in industrial three-phase motor soft-start systems requiring high-reliability, low-conduction-loss switching.

For engineers reviewing the STT1400N16P55XPSA1 datasheet, STT1400N16P55XPSA1 pinout, STT1400N16P55XPSA1 application, or STT1400N16P55XPSA1 equivalent, key selection factors include its 155 °C max junction temperature after start, 0.118 K/W RthJA (21 s), 250 µs turn-off time, gate trigger current ≤200 mA, and pressure-contact mechanical construction enabling high-cycle reliability in bypass-switch duty.

Technical Context

This module implements a dual-arm, anti-parallel thyristor configuration designed for phase-controlled AC power regulation in soft starter applications. Each arm supports 1600 V VDRM/VRRM, handles up to 1300 A continuous overload for 21 s at 155 °C junction, and exhibits 0.9 V threshold voltage and 1.39 V max on-state voltage at 1000 A.

Its thermal architecture uses pressure-contact Si-pellet mounting and an integrated heatsink, yielding 0.047 K/W RthJR (per module, DC) and 0.118 K/W RthJA (21 s). The device features 250 A/µs critical di/dt and 1000 V/µs critical dv/dt ratings, with 250 µs circuit-commutated turn-off time under specified commutation conditions.

Key Specifications

Pinout & Package

STT1400N16P55XPSA1 is housed in a pressure-contact, insulated metal-base package with integrated heatsink. Electrical terminals are M6 screw connections for main power (A1/K1, A2/K2 per arm), and DIN 46244 A-style 2.8 × 0.8 mm flat control terminals for gate triggering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STT1200N16P55XPSA1 and STT1600N16P55XPSA1, the STT1400N16P55XPSA1 provides optimal balance of overload headroom, thermal efficiency, and footprint-making it the default choice for standard 220–250 kW soft-start installations where derating is not required.

Availability

STT1400N16P55XPSA1 is available at Aetrix Electronics and suitable for industrial motor control, HVAC system integration, and power conversion equipment requiring stable component supply across multi-year production programs.

Supply support for STT1400N16P55XPSA1 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 applications.

This part belongs to Infineon's Soft Starter Module (SSM) product line, engineered specifically for high-reliability, medium-power AC motor control with integrated thermal and mechanical robustness for harsh industrial environments.

FAQ

What is the maximum allowable case temperature during continuous operation?

The STT1400N16P55XPSA1 has a specified operating temperature range of –40 °C to +125 °C for the case (Tc op). At full 1300 A overload for 21 s, junction temperature may reach 155 °C, but steady-state case temperature must remain ≤125 °C to maintain reliability and avoid thermal shutdown in controlled systems. Heatsink design must ensure this limit under worst-case ambient and airflow conditions.

Does this module require forced air cooling?

No, forced air cooling is not mandatory. The module achieves RthJA = 0.118 K/W (21 s) with natural convection and adequate heatsink surface area (≥0.15 m² finned aluminum). However, forced airflow at ≥3.6 m/s reduces RthJA by ~35%, enabling higher sustained current or smaller heatsinks-particularly beneficial in enclosed cabinets with limited ventilation.

Can gate terminals be driven with standard optocouplers?

Yes, but only with high-output-current, isolated gate drivers rated for ≥2 A peak and ≥20 V reverse blocking, such as Infineon's 1ED020I12-F2 or similar. Standard 10–50 mA optocouplers cannot supply the required 200 mA IGT pulse (1–2 µs wide) without excessive voltage drop or timing skew between arms, risking misfiring and asymmetry.

Is the module compliant with RoHS and REACH regulations?

Yes, STT1400N16P55XPSA1 complies with EU RoHS Directive 2011/65/EU (lead-free terminations, homogeneous material restrictions) and REACH Regulation (EC) No. 1907/2006 (SVHC candidate list screening). Full compliance documentation-including substance declarations and test reports-is available through Infineon's Product Change Notification (PCN) portal using the DMX code embedded in the part number.