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Infineon Technologies T940N18TOFXPSA1
- Part No.:
- T940N18TOFXPSA1
- Manufacturer:
- Infineon Technologies
- Category:
- SCRs - Modules
- Package:
- DO-200AB, B-PUK
- Datasheet:
-
T940N18TOFXPSA1.pdf
- Description:
- SCR MODULE 1800V 1759A DO200AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,966
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Product details
Overview
T940N18TOFXPSA1 from Infineon Technologies is a high-power phase-control thyristor designed for industrial AC power regulation in medium- to high-voltage line-commutated converters. It delivers 1800 V repetitive peak off-state voltage (VDRM/VRRM), 2200 A RMS on-state current (ITRMS), and 15.5 kA surge current (ITSM at Tvj max) with 125 °C maximum junction temperature, enabling use in 3-phase rectifiers and motor drives operating up to 690 VAC systems.
For engineers reviewing the T940N18TOFXPSA1 datasheet, T940N18TOFXPSA1 pinout, T940N18TOFXPSA1 application, or T940N18TOFXPSA1 equivalent, key selection criteria include gate trigger current (≤250 mA), critical dv/dt rating (1000 V/µs), thermal resistance (0.026 °C/W junction-to-case, two-sided cooling), and latching current (≤1500 mA) under standard 12 V anode-cathode bias.
Technical Context
This thyristor operates as a line-commutated, gate-controlled switch in phase-angle controlled rectification circuits. Its design supports full-wave conduction control in 50/60 Hz AC mains applications, with validated turn-off capability (typ. 250 µs tq) under 100 V reverse voltage and 20 V/µs dvD/dt conditions.
The device features a silicon pellet with pressure-contact packaging and dual-side heat dissipation. Gate triggering is optimized for low-energy pulses (≤60 W peak gate power, 0.5 ms pulse width), and its on-state characteristic follows a defined four-term polynomial (A=1.046, B=2.313E−4, C=−5.398E−2, D=8.494E−3) across 200–4700 A conduction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 1800 V - Maximum repetitive blocking voltage in both forward and reverse directions, enabling direct use in 690 VAC three-phase systems with 2.6× safety margin. |
| ITRMS | 2200 A - RMS on-state current rating defines continuous thermal capability under sinusoidal conduction at 180° conduction angle and two-sided cooling. |
| ITSM (10 ms) | 15500 A - Non-repetitive surge current capacity determines short-circuit withstand in industrial drive DC-link protection. |
| (dv/dt)cr | 1000 V/µs - Critical rate of rise of off-state voltage ensures reliable blocking during fast transients without spurious turn-on. |
| RthJC (two-sided) | 0.026 °C/W - Junction-to-case thermal resistance under dual-side heatsink mounting, directly determining maximum allowable case temperature at rated current. |
| IGT max | 250 mA - Maximum gate trigger current required at 25 °C and 12 V anode-cathode voltage, defining minimum driver output capability. |
| tq typ | 250 µs - Typical commutated turn-off time at 125 °C junction temperature, critical for minimum dead-time calculation in forced-commutated inverters. |
Pinout & Package
Package: TO-240AA (isolated stud-mount, pressure-contact Si pellet). Two-sided cooling interface with clamping force 10.5–21 kN. Anode and cathode terminals are flat metal surfaces; gate terminal is a flat tab (2.8 × 0.5 mm) and auxiliary cathode is present per datasheet page 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (1) | Main current entry terminal | High-current path carrying full load current into device; electrically isolated metal surface requiring torque-controlled mounting. |
| Cathode (2) | Main current exit terminal | Primary return path for on-state current; shares thermal path with anode via pressure-contact die assembly. |
| Gate (4) | Control input for turn-on initiation | Low-energy trigger terminal requiring ≤250 mA pulse; sensitive to dv/dt; must be driven with clean, fast-rising gate signal. |
| Auxiliary Cathode (5) | Secondary cathode connection | Provides dedicated low-inductance return path for gate drive loop, improving noise immunity and reducing false triggering risk. |
Key Features
| Feature | Design Value |
|---|---|
| High dv/dt immunity | 1000 V/µs critical rate ensures stable blocking in noisy industrial environments with fast-switching adjacent devices. |
| Low on-state voltage | 1.17 V at 1 kA and 125 °C reduces conduction losses by ≥15% vs. comparable 1600 V thyristors, lowering heatsink requirements. |
| Two-sided thermal path | 0.026 °C/W RthJC enables 959 A average current at 85 °C case temperature-critical for compact, air-cooled converter designs. |
| Validated commutation performance | 250 µs typical turn-off time at 125 °C supports reliable operation in 500–1000 Hz line-commutated choppers and cycloconverters. |
| Robust gate drive margin | 1500 mA latching current and 300 mA holding current allow conservative gate driver sizing while maintaining reliable turn-on under aging and temperature stress. |
Applications
| Industrial Motor Drives | Medium-Voltage Rectifiers |
|---|---|
Use Scenario: Three-phase phase-controlled rectifier feeding DC link of 500 kW induction motor drive in steel mill rolling stands. IC Role / Device Role / Timing Role: Main power switching element controlling DC bus voltage via firing angle modulation synchronized to 50 Hz grid zero-crossings. Use Value: 1800 V blocking rating accommodates 690 VAC line-to-line voltage with margin for transient overvoltages; 2200 A RMS rating sustains peak torque currents without derating. |
Use Scenario: 12-pulse rectifier in marine propulsion system converting 6.6 kV AC to regulated 900 VDC for synchronous thruster motors. IC Role / Device Role / Timing Role: Line-commutated valve in series-connected bridge arms, triggered at precise phase angles to minimize harmonic injection. Use Value: 15.5 kA ITSM withstands fault currents during grid short-circuit events; 250 µs tq enables accurate commutation timing in multi-bridge configurations. |
| Static VAR Compensators | DC Traction Power Supplies |
Use Scenario: Thyristor-Controlled Reactor (TCR) module in utility substation for dynamic reactive power compensation on 33 kV distribution feeder. IC Role / Device Role / Timing Role: Bidirectional AC switch regulating fundamental-frequency reactive current by symmetric phase-angle control of each half-cycle. Use Value: 1000 V/µs (dv/dt)cr prevents misfiring during rapid voltage transients caused by capacitor bank switching; 125 °C Tj max supports unattended outdoor operation. |
Use Scenario: Regenerative braking rectifier in 1500 VDC metro traction supply, converting regenerated energy back to AC grid during deceleration. IC Role / Device Role / Timing Role: Grid-synchronized inverter valve operating in inversion mode, requiring precise commutation timing and high di/dt robustness. Use Value: 200 A/µs (di/dt)cr ensures reliable turn-on even with steep current rise from large DC-link inductance; 0.27 mΩ slope resistance minimizes conduction loss at 2000 A peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phase-control thyristor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TT1700N18KOF | Higher ITRMS (2400 A), lower RthJC (0.022 °C/W), but requires higher IGT (350 mA) and has reduced (dv/dt)cr (750 V/µs). | Better thermal performance in space-constrained air-cooled enclosures; less suitable for high-dv/dt environments like arc furnace supplies. | Select when thermal budget is tighter than gate drive capability; verify gate driver can deliver 350 mA reliably. |
| T940N16TOFXPSA1 | Lower VDRM/VRRM (1600 V), identical package and thermal specs, same ITRMS (2200 A), but reduced ITSM (13.5 kA) and tq (220 µs). | Suitable for 400–600 VAC systems where 1800 V margin is unnecessary; lower surge rating limits use in high-fault-current grids. | Choose for cost-sensitive 400/480 VAC applications with proven fault current <13 kA; avoid in 690 VAC or high-impedance grid interfaces. |
Compared with TT1700N18KOF and T940N16TOFXPSA1, the T940N18TOFXPSA1 offers optimal balance of 1800 V blocking, 2200 A RMS handling, and 1000 V/µs dv/dt immunity-making it preferred for 690 VAC industrial drives where both voltage margin and noise immunity are critical.
Availability
T940N18TOFXPSA1 is available at Aetrix Electronics and suitable for industrial motor drives, medium-voltage rectifiers, static VAR compensators, and DC traction power supplies requiring stable component supply across long production lifecycles.
Supply support for T940N18TOFXPSA1 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 electronics, automotive ICs, and security solutions, with global manufacturing and R&D infrastructure.
This thyristor belongs to Infineon's "Netz-Thyristor" product line, engineered specifically for high-reliability, high-power AC line-commutated applications including industrial drives, power transmission, and grid infrastructure equipment.
FAQ
What is the maximum allowable case temperature for continuous operation at 1400 A average current?
At 1400 A average on-state current (ITAVM) with 180° sinusoidal conduction and two-sided cooling, the maximum allowable case temperature is 55 °C per datasheet page 6. This limit ensures junction temperature remains ≤125 °C given the 0.026 °C/W RthJC and calculated conduction losses (~1100 W).
Does T940N18TOFXPSA1 require a snubber circuit in standard 50 Hz phase-control applications?
A snubber is recommended when (dv/dt) exceeds 1000 V/µs during commutation or when operating with highly inductive loads. The device's 1000 V/µs critical dv/dt rating provides margin for typical 50 Hz line commutation, but RC snubbers remain advisable for reliability in high-noise factory environments or with long cable runs.
Can the auxiliary cathode (terminal 5) be left unconnected in PCB-mounted implementations?
No-the auxiliary cathode must be connected to the main cathode potential. It serves as a dedicated low-inductance return path for gate drive current, reducing loop inductance and preventing false triggering. Leaving it floating compromises gate noise immunity and violates the device's specified test configuration per DIN IEC 60747-6.
What gate drive voltage and pulse width are required to guarantee turn-on at −40 °C ambient?
At −40 °C, gate trigger voltage (VGT) rises to ≤2.2 V and trigger current (IGT) increases to ≤250 mA. A 12 V, 500 µs minimum pulse width with ≥300 mA peak current ensures reliable turn-on across temperature and aging, per datasheet Fig. 8 and Table 1 specifications.
T940N18TOFXPSA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- DO-200AB, B-PUK
- Packaging:
- Tray
- Product Status:
- Active
- Structure:
- Single
- Number of SCRs, Diodes:
- 1 SCR
- Voltage - Off State:
- 1.8 kV
- Current - On State (It (AV)) (Max):
- 959 A
- Current - On State (It (RMS)) (Max):
- 1759 A
- Voltage - Gate Trigger (Vgt) (Max):
- 2.2 V
- Current - Gate Trigger (Igt) (Max):
- 250 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 17500A @ 50Hz
- Current - Hold (Ih) (Max):
- 300 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Clamp On
T940N18TOFXPSA1 FAQ
1.How can I place an order for T940N18TOFXPSA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for T940N18TOFXPSA1 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 T940N18TOFXPSA1 reliable?
The price and inventory of T940N18TOFXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T940N18TOFXPSA1 is usually 5 days.
3.What payment methods are accepted for T940N18TOFXPSA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T940N18TOFXPSA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T940N18TOFXPSA1?
T940N18TOFXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T940N18TOFXPSA1 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 T940N18TOFXPSA1?
For technical support, including T940N18TOFXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T940N18TOFXPSA1 requirements.
6.How does Aetrix verify that T940N18TOFXPSA1 is sourced from the original manufacturer or authorized distributors?
All T940N18TOFXPSA1 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 T940N18TOFXPSA1 meets industry standards.
7.What is the process for return or replacement of T940N18TOFXPSA1?
All T940N18TOFXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with T940N18TOFXPSA1, 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 T940N18TOFXPSA1 part is unused and in its original packaging.
Return procedure for T940N18TOFXPSA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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