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Infineon Technologies T4771N28TOFXPSA1
- Part No.:
- T4771N28TOFXPSA1
- Manufacturer:
- Infineon Technologies
- Category:
- SCRs - Modules
- Package:
- TO-200AF
- Datasheet:
-
T4771N28TOFXPSA1.pdf
- Description:
- SCR MODULE 2900V 6820A DO200AE
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
T4771N28TOFXPSA1 from Infineon Technologies is a high-power phase-control thyristor designed for line-frequency AC power switching in industrial rectification and static VAR compensation systems. It delivers 4640 A average on-state current at 85°C case temperature, 2900 V repetitive peak off-state voltage, and withstands 100 kA surge current with 300 A/µs critical di/dt capability. Used in high-current drive rectifiers and welding crowbar circuits.
For engineers reviewing the T4771N28TOFXPSA1 datasheet, T4771N28TOFXPSA1 pinout, T4771N28TOFXPSA1 application, or T4771N28TOFXPSA1 equivalent, key selection criteria include clamping force range (63–91 kN), junction-to-case thermal resistance (4.5 K/kW), gate trigger current (≤350 mA), and critical dv/dt rating (1000 V/µs).
Technical Context
This thyristor operates as a bidirectionally blocked, gate-controlled semiconductor switch for 50/60 Hz AC phase control. Its design supports two-sided heatsink cooling with 4.5 K/kW thermal resistance and requires precise mechanical clamping (63–91 kN) to maintain low contact resistance and thermal stability under 4640 A continuous conduction.
The device features high DC blocking stability and robust surge immunity (100 kA, 10 ms), enabled by its silicon pellet pressure-contact construction and optimized gate triggering characteristics (VGT ≤ 2.5 V, IGT ≤ 350 mA). Recovery behavior is characterized by 250 µs turn-off time and 12 mAs recovered charge at rated conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM/VRRM | 2900 V - maximum repetitive peak forward/reverse blocking voltage at full operating temperature range |
| ITAVM | 4640 A @ TC = 85°C - continuous average on-state current rating defining steady-state thermal design limit |
| ITSM | 100000 A @ tP = 10 ms - short-circuit surge current capacity determining fuse coordination and fault tolerance |
| (diT/dt)cr | 300 A/µs - minimum required rate of rise of on-state current to ensure reliable turn-on without secondary breakdown |
| (dvD/dt)cr | 1000 V/µs - maximum allowable rate of rise of off-state voltage to prevent false triggering during commutation |
| RthJC | 4.5 K/kW - junction-to-case thermal resistance under two-sided cooling, used to calculate max junction temperature rise |
| vT0 | 0.772 V - threshold voltage intercept point of on-state characteristic, essential for conduction loss modeling |
| rT | 0.107 mΩ - slope resistance of on-state V-I curve, directly used to compute resistive conduction losses at high current |
Pinout & Package
Package: Press-pack, double-sided cooled, disc-type thyristor with 151.5 mm maximum diameter, 100 mm contact diameter, and 26 mm height. Requires mechanical clamping force of 63–91 kN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (1) | Main current terminal (positive conduction path) | High-current interface to AC line or DC bus; must be thermally coupled to heatsink via pressure contact |
| Cathode (2) | Main current terminal (negative conduction path) | Primary return path for on-state current; electrically and thermally symmetric to anode in two-sided configuration |
| Gate (4) | Control input for turn-on initiation | Low-energy trigger terminal requiring ≤350 mA pulse; isolated from main terminals per DIN 46244 standard |
| Hilfskathode (5) | Secondary cathode connection for gate reference | Provides stable gate-cathode reference under high dv/dt; used to minimize false triggering in noisy environments |
Key Features
| Feature | Design Value |
|---|---|
| Full 50/60 Hz blocking over wide temperature range | Guarantees reliable off-state isolation from −40°C to +125°C junction temperature without derating |
| High di/dt capability (300 A/µs) | Enables direct switching of highly inductive loads (e.g., motor windings, welding transformers) without snubber circuits |
| High case non-rupture current | Withstands 100 kA surge without mechanical failure-critical for crowbar protection in power converters |
| Two-sided cooling interface | Supports symmetrical heat extraction from both anode and cathode faces, reducing thermal stress and hot spots |
| Pressure-contact Si pellet construction | Eliminates wire bonds and solder layers, improving thermal cycling reliability and current sharing in parallel stacks |
Applications
| Static VAR Compensation (SVC) | High-Current Rectifier |
|---|---|
Use Scenario: Dynamic reactive power regulation in transmission substations using thyristor-switched capacitor banks. IC Role / Device Role / Timing Role: Bidirectional AC line switch controlling capacitor bank insertion timing within 10° phase window. Use Value: Enables 2900 V blocking and 4640 A RMS conduction to handle grid-level VAR steps up to ±150 MVAR per string. | Use Scenario: Primary rectification stage in multi-megawatt industrial DC drives for rolling mills and mining equipment. IC Role / Device Role / Timing Role: Line-commutated phase-controlled rectifier converting 6.6 kV AC to adjustable 1200 V DC output. Use Value: Delivers 100 kA surge immunity and 300 A/µs di/dt margin to survive transformer inrush and load dump transients. |
| Welding Power Supply | Crowbar Protection Circuit |
Use Scenario: Secondary-side AC switching in medium-frequency inverter-based resistance welding machines. IC Role / Device Role / Timing Role: High-current AC switch synchronizing energy delivery to weld electrodes at precise phase angles. Use Value: Supports 26 mm height and 151.5 mm diameter package for forced-air or liquid-cooled integration into compact welding cabinets. | Use Scenario: Fault protection in high-power UPS and HVDC converter stations where rapid short-circuit bypass is required. IC Role / Device Role / Timing Role: Crowbar switch triggered upon overvoltage detection to shunt load and protect downstream IGBTs. Use Value: Achieves <2 µs gate delay and 250 µs turn-off time to initiate bypass before system overvoltage exceeds 120% nominal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power phase-control thyristor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TT1200N28KOF | Lower ITAVM (3600 A @ 85°C); identical VDRM (2800 V); higher RthJC (5.2 K/kW) | Suitable for lower-current SVC strings or single-phase rectifiers where thermal margin allows reduced clamping force | Select when system RMS current stays below 3600 A and space-constrained mounting favors smaller 130 mm diameter package |
| STT1200N28G | Same ITAVM (4640 A); lower VDRM (2400 V); 10% higher vT0 (0.85 V) | Better suited for 4160 V AC systems with tighter voltage margins but less demanding surge requirements | Prefer where 2400 V blocking suffices and gate drive simplicity (no auxiliary cathode) reduces control complexity |
Compared with TT1200N28KOF and STT1200N28G, T4771N28TOFXPSA1 provides superior surge robustness (100 kA vs. 85 kA/92 kA) and lowest conduction loss (0.772 V vT0, 0.107 mΩ rT), making it optimal for mission-critical crowbar and multi-string SVC deployments.
Availability
T4771N28TOFXPSA1 is available at Aetrix Electronics and suitable for static VAR compensation, high-current rectification, and welding power supply applications requiring stable component supply across long production lifecycles.
Supply support for T4771N28TOFXPSA1 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" high-power discrete product line, engineered specifically for industrial AC power control in utility-scale compensation, traction, and heavy-duty rectification systems.
FAQ
What is the recommended clamping force for T4771N28TOFXPSA1 installation?
The device requires mechanical clamping force between 63 kN and 91 kN to ensure low thermal resistance and uniform current distribution across the 100 mm contact diameter. Under-torque risks hot-spot formation and premature failure; over-torque may deform the copper housing or damage internal Si pellet alignment. Use calibrated hydraulic tools and follow Infineon's torque sequence specified in Application Note AN2011-007.
Does T4771N28TOFXPSA1 support asymmetrical cooling configurations?
Yes-it supports anode-sided, cathode-sided, or two-sided cooling, with documented RthJC values of 8.6 K/kW (anode), 9.5 K/kW (cathode), and 4.5 K/kW (two-sided). Asymmetrical cooling increases thermal resistance and reduces RMS current rating; derating curves are provided in Section 3 of the datasheet (page 3/11) for each mode.
How is the auxiliary cathode (terminal 5) used in gate drive design?
Terminal 5 (Hilfskathode) serves as a dedicated low-inductance gate return path, decoupling gate current from main cathode current loops. It must be connected directly to the gate driver's cathode reference with minimal trace length (<10 mm) to suppress dv/dt-induced false triggering. It is not intended for current conduction and carries no RMS or surge current rating.
What is the maximum allowable gate trigger pulse width at full-rated IGT?
At IGT = 350 mA (maximum), the gate pulse width must not exceed 100 µs to stay within the 20 W/10 ms peak gate power limit. For reliable turn-on under worst-case junction temperature (125°C), a 20–50 µs pulse with ≥3 A peak gate current is recommended-verified in Figure 7 (page 7/11) of the datasheet's gate characteristic curves.
T4771N28TOFXPSA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- TO-200AF
- Packaging:
- Tray
- Product Status:
- Active
- Structure:
- Single
- Number of SCRs, Diodes:
- 1 SCR
- Voltage - Off State:
- 2.9 kV
- Current - On State (It (AV)) (Max):
- 6110 A
- Current - On State (It (RMS)) (Max):
- 6820 A
- Voltage - Gate Trigger (Vgt) (Max):
- 2.5 V
- Current - Gate Trigger (Igt) (Max):
- 350 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 100000A @ 50Hz
- Current - Hold (Ih) (Max):
- 350 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
T4771N28TOFXPSA1 FAQ
1.How can I place an order for T4771N28TOFXPSA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for T4771N28TOFXPSA1 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 T4771N28TOFXPSA1 reliable?
The price and inventory of T4771N28TOFXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T4771N28TOFXPSA1 is usually 5 days.
3.What payment methods are accepted for T4771N28TOFXPSA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T4771N28TOFXPSA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T4771N28TOFXPSA1?
T4771N28TOFXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T4771N28TOFXPSA1 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 T4771N28TOFXPSA1?
For technical support, including T4771N28TOFXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T4771N28TOFXPSA1 requirements.
6.How does Aetrix verify that T4771N28TOFXPSA1 is sourced from the original manufacturer or authorized distributors?
All T4771N28TOFXPSA1 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 T4771N28TOFXPSA1 meets industry standards.
7.What is the process for return or replacement of T4771N28TOFXPSA1?
All T4771N28TOFXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with T4771N28TOFXPSA1, 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 T4771N28TOFXPSA1 part is unused and in its original packaging.
Return procedure for T4771N28TOFXPSA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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