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

Infineon Technologies T420N18TOFXPSA1

Name: T420N18TOFXPSA1
Brand: Infineon Technologies
SKU: T420N18TOFXPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T420N18TOFXPSA1

Manufacturer:: Infineon Technologies

Category:: SCRs - Modules

Package:: DO-200AA, A-PUK

Datasheet:: T420N18TOFXPSA1.pdf

Description:: SCR MODULE 1800V 750A DO200AA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

T420N18TOFXPSA1 from Infineon Technologies is a phase-control thyristor designed for high-power AC line commutation in industrial rectifiers, motor drives, and static VAR compensators. It delivers 424 A average on-state current at 85 °C case temperature, 1800 V repetitive peak off-state voltage (VDRM/VRRM), and supports 7200 A non-repetitive surge current (10 ms, 25 °C). Its 125 °C maximum junction temperature enables operation in forced-air or liquid-cooled power conversion systems.

For engineers reviewing the T420N18TOFXPSA1 datasheet, T420N18TOFXPSA1 pinout, T420N18TOFXPSA1 application, or T420N18TOFXPSA1 equivalent, key selection criteria include gate trigger current (≤200 mA), critical dv/dt rating (1000 V/µs), thermal resistance (0.056 °C/W junction-to-case, two-sided cooling), and RMS on-state current capability (960 A).

Technical Context

This thyristor operates as a bidirectional, gate-controlled semiconductor switch for phase-angle controlled AC power regulation. It features a silicon pellet with pressure-contact construction, requiring precise clamping force (5–10 kN) to maintain thermal and electrical integrity under high di/dt (120 A/µs) and dv/dt stress.

Its turn-off behavior is defined by circuit-commutated commutation (tq = 220 µs typ.), with recovery charge (Qr) dependent on di/dt and on-state current (e.g., 100 µAs at 20 A, 500 µAs at 500 A). The device lacks intrinsic reverse conduction and must be used in anti-parallel configuration or with external freewheeling paths in DC applications.

Key Specifications

Parameter	Value and Actual Design Meaning
VDRM / VRRM	1800 V - Maximum repetitive blocking voltage in forward and reverse directions, defining usable AC line voltage range up to 1270 V RMS.
ITAVM (TC = 85 °C)	424 A - Continuous average on-state current limit under standard heatsink conditions, directly sizing thermal design.
ITRMS	960 A - RMS on-state current rating, used for I²t-based fuse coordination and loss calculation in sinusoidal conduction.
ITSM (10 ms, 25 °C)	7200 A - Short-circuit withstand capability, determining upstream protection device ratings.
(dvD/dt)cr	1000 V/µs - Minimum required snubber dv/dt immunity to prevent false triggering during voltage transients.
RthJC (two-sided)	0.056 °C/W - Junction-to-case thermal resistance under optimal double-sided cooling, enabling accurate junction temperature prediction.
IGT max	200 mA - Maximum gate trigger current needed at 25 °C and 12 V anode-cathode voltage, defining driver output capability.

Pinout & Package

Package: TO-240AA (also designated TO-240, ISOPLUS247™ variant), ceramic-insulated, pressure-contact metal package with isolated anode/cathode terminals and flat gate terminal. Requires mechanical clamping (5–10 kN) for reliable thermal and electrical contact.

Pin/Terminal	Circuit Role	Design Meaning
Anode (1)	Main current entry terminal	Carries full load current into device; must be thermally coupled to heatsink via pressure interface.
Cathode (2)	Main current exit terminal	Completes main conduction path; electrically and thermally connected to heatsink in standard mounting.
Gate (4)	Control input terminal	Triggers conduction when ≥200 mA pulse applied; low-impedance connection required to minimize noise susceptibility.
Auxiliary Cathode (5)	Secondary cathode reference	Provides low-inductance gate return path in high-di/dt applications; often tied to main cathode externally.

Key Features

Feature	Design Value
High surge current rating	7200 A (10 ms, 25 °C) enables robust short-circuit handling without derating in industrial motor starters.
Low on-state voltage	1.2 V at 300 A (Tvj max) reduces conduction losses and improves system efficiency in high-current rectifiers.
High critical dv/dt	1000 V/µs prevents spurious turn-on during fast-rising line transients in unfiltered AC mains environments.
Two-sided thermal interface	0.056 °C/W RthJC enables compact thermal design with dual heatsink contact, reducing footprint vs. single-sided packages.
Pressure-contact construction	Si-pellet with mechanical clamping ensures stable contact resistance over lifetime, avoiding solder fatigue failure modes.

Applications

Industrial Motor Drives

High-Power Rectifiers

Use Scenario: Phase-controlled speed regulation of 3-phase induction motors in HVAC blowers and conveyor systems operating from 400–690 V AC mains.

IC Role / Device Role / Timing Role: Main power switching element in semi-controlled bridge configuration, gated at precise firing angles to modulate average output voltage.

Use Value: Enables smooth torque control with 424 A continuous current handling and 1800 V blocking margin for 690 V AC systems with transient overvoltage tolerance.

Use Scenario: 12-pulse rectification in DC traction power supplies for rail vehicles, converting 25 kV AC overhead lines to regulated 1500 V DC bus.

IC Role / Device Role / Timing Role: High-current thyristor in series-connected valve stacks, synchronized to line frequency for harmonic cancellation.

Use Value: Delivers 960 A RMS conduction capability and 7200 A surge withstand to sustain fault currents during line-side short circuits.

Static VAR Compensators

Medium-Voltage Soft Starters

Use Scenario: Reactive power compensation in utility substations using thyristor-switched capacitor banks (TSC) operating at 15–36 kV distribution levels.

IC Role / Device Role / Timing Role: Bidirectional switching element controlling capacitor bank insertion timing to maintain grid power factor within ±0.01 tolerance.

Use Value: 1000 V/µs dv/dt immunity prevents misfiring during rapid voltage transitions across capacitor banks during switching events.

Use Scenario: Reduced-voltage motor starting for 6.6 kV mining pumps, limiting inrush current to ≤3× full-load amperes during ramp-up.

IC Role / Device Role / Timing Role: Series-connected thyristor pair per phase, progressively increasing conduction angle from 0° to 180° over 10–30 s.

Use Value: 220 µs typical turn-off time (tq) ensures clean commutation between half-cycles, preventing current chopping and voltage spikes during ramp termination.

Equivalent & Alternatives

The following parts are listed as comparable options for similar phase-control thyristor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TT140N18KOF	Higher ITAVM (520 A @ 85 °C), same VDRM (1800 V), lower RthJC (0.045 °C/W), TO-240AA package	Supports higher continuous current in identical thermal footprint; requires tighter gate drive timing due to faster tq (180 µs)	Select when upgrading thermal margin or increasing system power density without changing heatsink geometry.
T420N18TOF	Same electrical specs, but uses older TO-240 package without ISOPLUS247™ enhanced isolation; 0.062 °C/W RthJC (two-sided)	Limited to lower ambient or less aggressive cooling; reduced creepage distance (4 mm vs. 6 mm) restricts use in pollution degree 3 environments	Select only for legacy replacement where existing mechanical mounting and insulation requirements match original design.

Compared with TT140N18KOF and T420N18TOF, the T420N18TOFXPSA1 offers balanced performance: superior dv/dt immunity over TT140N18KOF for noisy grids, and better isolation/thermal performance than T420N18TOF for modern medium-voltage industrial enclosures.

Availability

T420N18TOFXPSA1 is available at Aetrix Electronics and suitable for industrial motor drives, high-power rectifiers, static VAR compensators, and medium-voltage soft starters requiring stable component supply and long-term lifecycle support.

Supply support for T420N18TOFXPSA1 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 automotive ICs, with global manufacturing and R&D infrastructure.

This part belongs to Infineon's "Netz-Thyristor" product line, engineered specifically for high-reliability, high-current phase-control applications in industrial energy conversion systems where thermal stability and transient robustness are critical.

FAQ

What is the recommended gate drive circuit for T420N18TOFXPSA1?

A pulse transformer or optocoupler-isolated gate driver delivering ≥2 A peak current, 200 mA minimum trigger current, and <4 µs delay is recommended. Gate resistor must limit di/dt to ≤1 A/µs during turn-on; auxiliary cathode (pin 5) should be shorted to main cathode to minimize gate loop inductance.

Can T420N18TOFXPSA1 be used in reverse-conducting configurations?

No - this is a standard (non-symmetrical) thyristor with no inherent reverse conduction capability. For bidirectional AC switching, it must be used in anti-parallel pairs or with external reverse-path diodes; reverse blocking is rated only to VRRM (1800 V), not conduction.

What is the maximum allowable clamping force during mounting?

The specified clamping force range is 5–10 kN. Exceeding 10 kN risks ceramic insulator fracture or silicon die cracking; below 5 kN increases contact resistance and thermal impedance, risking premature thermal runaway at rated current.

How does conduction angle affect thermal derating?

At θ = 30° conduction, case temperature limits drop to ~60 A ITAV (vs. 424 A at 180°), due to increased harmonic content and reduced RMS-to-average ratio. Thermal design must use ZthJC curves with ∆Zth correction factors - e.g., +0.0799 °C/W penalty for 30° rectangular conduction under two-sided cooling.

T420N18TOFXPSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: DO-200AA, A-PUK

Packaging:: Tray

Product Status:: Obsolete

Structure:: Single

Number of SCRs, Diodes:: 1 SCR

Voltage - Off State:: 1.8 kV

Current - On State (It (AV)) (Max):: 424 A

Current - On State (It (RMS)) (Max):: 750 A

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

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 7200A @ 50Hz

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

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Clamp On

T420N18TOFXPSA1 FAQ

1.How can I place an order for T420N18TOFXPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for T420N18TOFXPSA1 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 T420N18TOFXPSA1 reliable?

The price and inventory of T420N18TOFXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T420N18TOFXPSA1 is usually 5 days.

3.What payment methods are accepted for T420N18TOFXPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T420N18TOFXPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T420N18TOFXPSA1?

T420N18TOFXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T420N18TOFXPSA1 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 T420N18TOFXPSA1?

For technical support, including T420N18TOFXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T420N18TOFXPSA1 requirements.

6.How does Aetrix verify that T420N18TOFXPSA1 is sourced from the original manufacturer or authorized distributors?

All T420N18TOFXPSA1 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 T420N18TOFXPSA1 meets industry standards.

7.What is the process for return or replacement of T420N18TOFXPSA1?

All T420N18TOFXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with T420N18TOFXPSA1, 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 T420N18TOFXPSA1 part is unused and in its original packaging.

Return procedure for T420N18TOFXPSA1:

1.Submit a request within 90 days.

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

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