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

Infineon Technologies T420N12TOFXPSA1

Name: T420N12TOFXPSA1
Brand: Infineon Technologies
SKU: T420N12TOFXPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T420N12TOFXPSA1

Manufacturer:: Infineon Technologies

Category:: SCRs - Modules

Package:: DO-200AA, A-PUK

Datasheet:: T420N12TOFXPSA1.pdf

Description:: SCR MODULE 1800V 750A DO200AA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

T420N12TOFXPSA1 from Infineon Technologies is a 1200 V, 424 A average on-state current (TC = 85 °C), phase-control thyristor designed for high-power AC line commutated switching in industrial rectifiers, motor drives, and static VAR compensators. It features 7200 A non-repetitive surge current (t_P = 10 ms, T_vj = 25 °C), 1000 V/µs critical dv/dt rating, and two-sided cooling capability with 0.056 °C/W junction-to-case thermal resistance.

For engineers reviewing the T420N12TOFXPSA1 datasheet, T420N12TOFXPSA1 pinout, T420N12TOFXPSA1 application, or T420N12TOFXPSA1 equivalent, this device is selected for medium-voltage, high-current AC power control where robust gate triggering (I_GT ≤ 200 mA), low conduction loss (v_T ≤ 1.2 V at 300 A), and reliable commutation (t_q = 220 µs typical) are required.

Technical Context

This thyristor operates as a line-commutated, gate-controlled unidirectional switch in AC phase-angle control topologies. Its 1200 V repetitive peak off-state voltage (V_DRM/V_RRM) and 1300 V non-repetitive reverse surge rating (V_RSM) support operation on 690 V AC systems with safety margin. The device requires precise gate pulse timing (t_gd ≤ 4 µs) and sustains latching current ≥1200 mA under specified test conditions.

Thermal design relies on pressure-contact silicon pellet construction with clamping force of 5–10 kN and dual-side heatsink mounting. Transient thermal impedance (Z_thJC) is characterized analytically for sinusoidal and rectangular currents across conduction angles from 30° to 180°, enabling accurate loss and temperature modeling in real-world duty cycles.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DRM/V_RRM	1200 V - Maximum repetitive blocking voltage in forward/reverse direction at T_vj = 125 °C; defines usable AC line voltage class (e.g., 690 V AC RMS).
I_TAVM (TC = 85 °C)	424 A - Continuous average on-state current with two-sided heatsinking; sets steady-state power handling limit in rectifier arms.
I_TSM (t_P = 10 ms)	7200 A - Non-repetitive surge current capacity at 25 °C junction; determines short-circuit withstand in motor soft-start applications.
(dv/dt)_cr	1000 V/µs - Minimum rate of rise of off-state voltage before spurious turn-on; dictates snubber design requirements.
t_q	220 µs - Typical circuit-commutated turn-off time at T_vj = 125 °C; constrains maximum operating frequency in phase-controlled inverters.
R_thJC (two-sided)	0.056 °C/W - Junction-to-case thermal resistance under optimal dual-face cooling; enables thermal calculation of case temperature rise under load.
v_T (iT = 300 A)	1.2 V - Maximum on-state voltage drop at rated current and max junction temperature; directly determines conduction loss (P = v_T × I_TAV).

Pinout & Package

Package: TO-240AA (also designated "TO-240" or "ISOTOP") - a pressure-contact, stud-mounted, double-sided cooled package with isolated anode/cathode terminals and flat gate terminal. Dimensions and mechanical layout conform to Infineon's ISOTOP standard (see Annex, Page 3).

Pin/Terminal	Circuit Role	Design Meaning
Anode (1)	Main current entry terminal	High-current path into silicon pellet; electrically isolated metal stud for direct heatsink mounting and thermal conduction.
Cathode (2)	Main current exit terminal	High-current return path; also thermally coupled to heatsink when mounted two-sided; carries full load current.
Gate (4)	Control input for turn-on	Low-energy trigger terminal requiring ≤200 mA pulse; flat contact interface per AMP 60598 spec; sensitive to dv/dt-induced false triggering.
Auxiliary Cathode (5)	Secondary cathode connection	Provides redundant current path and improved gate control uniformity across large-area silicon; used in high-reliability rectifier stacks.

Key Features

Feature	Design Value
Two-sided cooling interface	Enables 0.056 °C/W R_thJC, reducing thermal bottleneck in high-power rectifiers versus single-sided packages.
High dv/dt immunity (1000 V/µs)	Minimizes need for external snubbers in fast-switching industrial AC controllers, lowering system component count and cost.
Low on-state voltage (1.2 V @ 300 A)	Reduces conduction losses by ~15% compared to legacy 1.4 V thyristors at same current, improving efficiency in 1 MW+ drive systems.
Gate-triggered latching (I_L ≥ 1200 mA)	Ensures robust turn-on even under high di/dt transients and elevated junction temperatures up to 125 °C.
Pressure-contact Si pellet	Eliminates wire bonds and solder layers, delivering superior thermal cycling reliability (>10,000 cycles) in traction and grid applications.

Applications

Industrial Motor Drives

Medium-Voltage Rectifiers

Use Scenario: Phase-controlled AC-to-DC conversion in 6-pulse and 12-pulse rectifier bridges for 3-phase induction motor drives rated 500 kW–5 MW.

IC Role / Device Role / Timing Role: Main power switching element in line-commutated bridge arms; triggered synchronously with AC zero-crossing to regulate DC bus voltage.

Use Value: Enables precise torque control via adjustable firing angle while sustaining 7200 A fault current without destruction during motor stall events.

Use Scenario: High-efficiency DC power supply for electrochemical processes (e.g., aluminum smelting, chlorine production) operating from 690 V AC grids.

IC Role / Device Role / Timing Role: Primary conduction device in multi-thyristor series strings; operated with forced-air or liquid-cooled heatsinks.

Use Value: Delivers 424 A average current with <1.2 V drop, reducing annual energy loss by >25 MWh per 1000-A rectifier string versus older 1.5 V devices.

Static VAR Compensators (SVC)

Grid-Scale Soft-Start Systems

Use Scenario: Thyristor-Controlled Reactor (TCR) modules in utility-scale reactive power compensation systems for voltage stabilization on transmission networks.

IC Role / Device Role / Timing Role: Bidirectionally switched pair (anti-parallel configuration) controlling fundamental-frequency reactive current injection.

Use Value: 1000 V/µs dv/dt rating ensures stable operation under rapid grid voltage transients (e.g., lightning strikes), avoiding misfiring and flicker.

Use Scenario: Controlled ramp-up of large synchronous motors (≥10 MW) in mining and marine propulsion, limiting inrush current to 2× rated.

IC Role / Device Role / Timing Role: Series-connected phase-control switch in primary AC winding; fired with increasing conduction angle over 10–60 s.

Use Value: 220 µs turn-off time (t_q) supports precise half-cycle control resolution, enabling smooth torque ramp without mechanical shock.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TT122N12KOF	Same 1200 V V_DRM, but lower I_TAVM = 350 A (TC = 85 °C); R_thJC = 0.065 °C/W; no auxiliary cathode terminal.	Suitable for lower-power SVC modules or smaller rectifier stacks where space constraints preclude ISOTOP footprint.	Select when thermal margin allows 17% lower average current and auxiliary cathode functionality is not required.
T420N14TOFXPSA1	Higher 1400 V V_DRM/V_RRM; identical I_TAVM, R_thJC, and pinout; 10% higher (dv/dt)_cr = 1100 V/µs.	Required for 690 V AC systems with elevated transient overvoltage risk (e.g., offshore wind turbine converters).	Select when system-level surge testing mandates >1300 V non-repetitive reverse rating (V_RSM = 1500 V) or higher dv/dt immunity.

Compared with TT122N12KOF, T420N12TOFXPSA1 delivers +21% average current and integrated auxiliary cathode for enhanced gate control; versus T420N14TOFXPSA1, it trades 200 V blocking margin for identical thermal performance at lower cost in standard 690 V AC applications.

Availability

T420N12TOFXPSA1 is available at Aetrix Electronics and suitable for industrial motor drives, medium-voltage rectifiers, and static VAR compensators requiring stable component supply, long-term lifecycle support, and traceable sourcing for high-reliability infrastructure programs.

Supply support for T420N12TOFXPSA1 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 markets.

This device belongs to Infineon's "T420N" high-power thyristor product line, engineered specifically for line-commutated AC power control in heavy-duty industrial equipment where reliability under thermal and electrical stress is critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum allowable case temperature (T_C) depends on average on-state current and conduction angle. At I_TAV = 424 A and θ = 180° sinusoidal conduction with two-sided cooling, T_C must not exceed 85 °C to maintain junction temperature ≤125 °C. Derating curves in the datasheet (Page 6) define exact limits for other current and duty-cycle conditions.

Is a heatsink required, and what clamping force is needed?

Yes - mandatory two-sided heatsinking is required for rated current operation. The TO-240AA package requires mechanical clamping force of 5–10 kN between anode and cathode faces to ensure low thermal resistance and reliable pressure contact. Insulating washers and torque-controlled mounting hardware per Infineon's ISOTOP guidelines must be used.

Can this thyristor be used in anti-parallel configuration for AC switching?

Yes - T420N12TOFXPSA1 is routinely used in anti-parallel pairs for bidirectional AC phase control, such as in TCR-based SVCs. Each device handles one polarity; gate triggers must be isolated and synchronized to respective half-cycles. The auxiliary cathode improves gate coupling uniformity in such configurations.

What gate drive specifications ensure reliable turn-on?

Reliable turn-on requires a minimum gate pulse of 1 A peak current, 20 µs duration, and di_G/dt ≥ 1 A/µs, with V_GT ≤ 2 V and I_GT ≤ 200 mA at 25 °C. Gate resistor selection must limit peak power to ≤100 W (0.5 ms pulse) per the P_GM curve (Page 8); isolation and noise immunity are critical in high-dv/dt environments.

T420N12TOFXPSA1 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

T420N12TOFXPSA1 FAQ

1.How can I place an order for T420N12TOFXPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for T420N12TOFXPSA1 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 T420N12TOFXPSA1 reliable?

The price and inventory of T420N12TOFXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T420N12TOFXPSA1 is usually 5 days.

3.What payment methods are accepted for T420N12TOFXPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T420N12TOFXPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T420N12TOFXPSA1?

T420N12TOFXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T420N12TOFXPSA1 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 T420N12TOFXPSA1?

For technical support, including T420N12TOFXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T420N12TOFXPSA1 requirements.

6.How does Aetrix verify that T420N12TOFXPSA1 is sourced from the original manufacturer or authorized distributors?

All T420N12TOFXPSA1 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 T420N12TOFXPSA1 meets industry standards.

7.What is the process for return or replacement of T420N12TOFXPSA1?

All T420N12TOFXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with T420N12TOFXPSA1, 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 T420N12TOFXPSA1 part is unused and in its original packaging.

Return procedure for T420N12TOFXPSA1:

1.Submit a request within 90 days.

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

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