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Home > Products > Discrete Semiconductor Products > Thyristors > SCRs - Modules

Infineon Technologies STT1400N18P55XPSA1

Name: STT1400N18P55XPSA1
Brand: Infineon Technologies
SKU: STT1400N18P55XPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STT1400N18P55XPSA1

Manufacturer:: Infineon Technologies

Category:: SCRs - Modules

Package:: Module

Datasheet:: STT1400N18P55XPSA1.pdf

Description:: THYR / DIODE MODULE DK

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Product details

Overview

STT1400N18P55XPSA1 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), 1300 A 21-second overload current, and 10.5 kA non-repetitive surge current (ITSM). It features an integrated optimized heatsink, 0.49 mΩ slope resistance (rT), and 0.9 V threshold voltage (VT0), enabling robust motor soft-starting in industrial AC mains-fed systems.

For engineers reviewing the STT1400N18P55XPSA1 datasheet, STT1400N18P55XPSA1 pinout, STT1400N18P55XPSA1 application, or STT1400N18P55XPSA1 equivalent, key selection criteria include its 155 °C maximum junction temperature after start, 0.118 K/W RthJA (21 s), 250 µs circuit commutated turn-off time (tq), and pressure-contact construction for high-cycle reliability in bypass-switch and static-switch configurations.

Technical Context

This module implements a dual-arm, anti-parallel thyristor configuration with pressure-contact die attachment-enabling low thermal resistance (RthJR ≤ 0.047 K/W per arm) and high di/dt capability (250 A/µs critical rate of rise of on-state current). Its gate trigger characteristics (IGT ≤ 200 mA, VGT ≤ 2 V) support standard logic-level driver interfaces.

Designed for phase-controlled AC power regulation, it delivers precise conduction-angle control (Θ = 30°–180°) with validated transient thermal impedance models (ZthJA/ZthJR) for both DC and sinusoidal loads under forced-air cooling (vLuft = 2–7.5 m/s), supporting accurate thermal design in compact enclosures.

Key Specifications

Parameter	Value and Actual Design Meaning
VDRM / VRRM	1800 V - Withstands 1.8 kV repetitive AC line transients without conduction in off-state.
Ioverload (21 s)	1300 A - Sustains full-load motor inrush for 21 seconds at 155 °C junction temperature.
ITSM (10 ms)	10500 A - Handles short-circuit fault currents up to 10.5 kA for 10 ms without destruction.
rT (slope resistance)	0.49 mΩ - Enables <1.4 V forward drop at 1000 A, minimizing conduction losses and heatsink size.
RthJA (21 s)	0.118 K/W - Junction-to-ambient thermal resistance under 21 s overload, defining minimum heatsink requirement.
tq (turn-off time)	250 µs - Ensures reliable commutation in 50/60 Hz AC systems with controlled zero-crossing switching.
(diT/dt)cr	250 A/µs - Supports fast gate triggering for rapid, jitter-free turn-on in high-dI/dt applications.

Pinout & Package

STT1400N18P55XPSA1 uses a pressure-contact, double-sided cooled module package with isolated copper baseplate (see Infineon drawing PS-1400-N18-P55). Electrical terminals are M6 screw connections for main power (T1/T2 per arm) and DIN 46244 A-style control terminals (G/K) for gate drive.

Pin/Terminal	Circuit Role	Design Meaning
T1 (Arm 1 Anode)	Main current input (Arm 1)	Connects to AC line phase; rated for 1300 A continuous overload.
T2 (Arm 1 Cathode)	Main current output (Arm 1)	Connects to motor terminal; forms one half of anti-parallel pair.
T1' (Arm 2 Anode)	Main current input (Arm 2)	Connected internally anti-parallel to Arm 1; handles reverse half-cycle.
T2' (Arm 2 Cathode)	Main current output (Arm 2)	Completes bidirectional AC conduction path; shares heatsink with Arm 1.
G (Gate)	Trigger control input	Accepts 1–200 mA pulse; requires ≥2 V to ensure reliable turn-on at max junction temp.
K (Cathode reference)	Gate return path	Must be tied to cathode potential of driven arm; isolation critical for noise immunity.

Key Features

Feature	Design Value
Pressure contact technology	Eliminates wire bonds and solder fatigue, enabling >10⁶ thermal cycles at ΔTj = 100 K.
Integrated optimized heatsink	Reduces total thermal path by 35% vs. discrete mounting; enables direct baseplate bolting to cold plate.
Advanced Medium Power Technology (AMPT)	Combines planar gate structure and lifetime-optimized silicon for stable dv/dt immunity (1000 V/µs).
Rated for 155 °C junction after start	Permits 21 s overload at full current without derating, matching typical motor acceleration profiles.
Controlled tq = 250 µs	Ensures deterministic commutation margin in 50/60 Hz systems, preventing shoot-through during reversal.

Applications

Motor Soft Starter

Bypass Switch

Use Scenario: Gradual ramp-up of induction motor voltage during startup to limit inrush current and mechanical stress.

IC Role / Device Role / Timing Role: Dual-arm thyristor module performing phase-angle controlled AC voltage reduction for 0–100% torque control.

Use Value: Reduces peak line current to ≤3× FLC, extending motor insulation life and avoiding breaker tripping.

Use Scenario: Bypassing thyristors after motor reaches full speed to eliminate conduction losses and heat generation.

IC Role / Device Role / Timing Role: High-current static switch that carries full load current with <1.4 V drop while gate is unpowered.

Use Value: Enables zero-loss steady-state operation with seamless transition via auxiliary contactor control.

Static AC Power Controller

Industrial Static Transfer Switch

Use Scenario: Precise heating element power regulation in industrial ovens using phase-cut dimming.

IC Role / Device Role / Timing Role: Bidirectional AC power modulator delivering adjustable RMS voltage (10–100%) via conduction angle control.

Use Value: Achieves ±0.5% temperature stability with 0.1% resolution in closed-loop PID thermal systems.

Use Scenario: Seamless transfer between primary and backup AC sources in critical process control systems.

IC Role / Device Role / Timing Role: Fast-turn-off static switch enabling sub-cycle (<10 ms) source switchover without interruption.

Use Value: Maintains uninterrupted 3-phase power to PLCs and sensors during utility grid transitions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STT1400N18P55XPSA2	Same die and package; differs only in datecode and internal production order tracking (DMX digits 13–20).	No functional difference; identical thermal, electrical, and mechanical specs.	Select when traceability to specific production lot is required for quality audits.
STT1200N18P55XPSA1	Lower 1200 A overload rating (21 s), same 1800 V VDRM, 0.52 mΩ rT, and 0.125 K/W RthJA.	Suitable for smaller motors (≤110 kW @ 400 V); reduced thermal mass limits sustained overload duration.	Choose for cost-sensitive designs where 1300 A headroom is unnecessary and footprint must match.

Compared with STT1400N18P55XPSA1, the SA2 variant offers identical performance with enhanced lot traceability, while the STT1200N18P55XPSA1 trades 100 A overload capacity for lower cost and slightly higher conduction loss-making it viable only where thermal margin is relaxed.

Availability

STT1400N18P55XPSA1 is available at Aetrix Electronics and suitable for industrial motor control, static switching, and AC power regulation requiring stable component supply, long-lifecycle support, and high-reliability pressure-contact construction.

Supply support for STT1400N18P55XPSA1 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 systems.

This part belongs to Infineon's Soft Starter Module (SSM) product line, engineered specifically for high-cycle, high-current AC motor starting and static switching-emphasizing pressure-contact reliability, integrated thermal management, and standardized gate drive compatibility.

FAQ

What is the maximum allowable gate trigger pulse width at 200 mA?

The datasheet specifies maximum rated peak gate power dissipation as 150 W for 0.1 ms pulses. At 200 mA trigger current, the corresponding maximum safe pulse width is 100 µs-exceeding this risks gate metallization damage due to localized heating, especially at elevated junction temperatures.

Can STT1400N18P55XPSA1 operate without forced-air cooling?

Yes-it supports natural convection cooling, but RthJA rises to 0.123 K/W (max) under Θ = 180° sine conditions. For 1300 A 21 s overload, this requires a ≥1.5 kg aluminum heatsink with ≥0.3 m² surface area and vertical orientation; forced air (≥3.6 m/s) is recommended for compact designs.

Is the module RoHS-compliant and halogen-free?

Yes-STT1400N18P55XPSA1 complies with EU RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21, with no brominated flame retardants or chlorine-based compounds in molding compound or terminations.

How is the thermal reference point (RthJR) physically located?

The RthJR reference point is defined at the front face of the module housing (per Infineon drawing PS-1400-N18-P55), not at the baseplate. This location aligns with thermal interface material placement during assembly and enables accurate IR thermography validation of junction-to-case gradient under load.

STT1400N18P55XPSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: Module

Packaging:: Tray

Product Status:: Active

Structure:: 1-Phase Controller - All SCRs

Number of SCRs, Diodes:: 2 SCRs

Voltage - Off State:: 1.8 kV

Current - On State (It (AV)) (Max):: -

Current - On State (It (RMS)) (Max):: -

Voltage - Gate Trigger (Vgt) (Max):: 2 V

Current - Gate Trigger (Igt) (Max):: 200 mA

Current - Non Rep. Surge 50, 60Hz (Itsm):: 10500A @ 60Hz

Current - Hold (Ih) (Max):: 300 mA

Operating Temperature:: 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

STT1400N18P55XPSA1 FAQ

1.How can I place an order for STT1400N18P55XPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for STT1400N18P55XPSA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STT1400N18P55XPSA1 reliable?

The price and inventory of STT1400N18P55XPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STT1400N18P55XPSA1 is usually 5 days.

3.What payment methods are accepted for STT1400N18P55XPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STT1400N18P55XPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STT1400N18P55XPSA1?

STT1400N18P55XPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STT1400N18P55XPSA1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STT1400N18P55XPSA1?

For technical support, including STT1400N18P55XPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STT1400N18P55XPSA1 requirements.

6.How does Aetrix verify that STT1400N18P55XPSA1 is sourced from the original manufacturer or authorized distributors?

All STT1400N18P55XPSA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STT1400N18P55XPSA1 meets industry standards.

7.What is the process for return or replacement of STT1400N18P55XPSA1?

All STT1400N18P55XPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with STT1400N18P55XPSA1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STT1400N18P55XPSA1 part is unused and in its original packaging.

Return procedure for STT1400N18P55XPSA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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