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

Infineon Technologies TT251N14KOFHPSA1

Name: TT251N14KOFHPSA1
Brand: Infineon Technologies
SKU: TT251N14KOFHPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TT251N14KOFHPSA1

Manufacturer:: Infineon Technologies

Category:: SCRs - Modules

Package:: Module

Datasheet:: TT251N14KOFHPSA1.pdf

Description:: SCR MODULE 1.4KV MODULE

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TT251N14KOFHPSA1 from Infineon Technologies is a phase-control thyristor module designed for high-power AC line switching and rectification in industrial drive systems. It features 1400 V VDRM/VRRM, 250 A ITAVM (at TC = 85 °C), 9100 A ITSM surge current, 0.8 V VT0 threshold voltage, and 0.124 K/W RthJC thermal resistance - enabling robust operation in soft starters and static power controllers.

For engineers reviewing the TT251N14KOFHPSA1 datasheet, TT251N14KOFHPSA1 pinout, TT251N14KOFHPSA1 application, or TT251N14KOFHPSA1 equivalent, key selection criteria include repetitive peak blocking voltage (1400 V), RMS on-state current capability (410 A), gate trigger sensitivity (IGT ≤ 200 mA), transient thermal impedance behavior, and pressure-contact construction for high-cycle reliability under forced-air or liquid-cooled heatsink mounting.

Technical Context

This dual-thyristor, press-pack module implements line-synchronized phase-angle control in bidirectional AC power paths. Its 125 °C maximum junction temperature, 250 A average on-state current rating at 85 °C case temperature, and 250 µs typical turn-off time (tq) support controlled conduction angles from 30° to 180° in rectifier and crowbar topologies.

The device uses silicon pellets with pressure-contact metallization and AlN-based internal insulation (Class I, EN61140), delivering 3.0 kV RMS insulation test voltage and 17 mm creepage distance. Gate triggering requires ≤2.0 V VGT and ≤200 mA IGT under standard 12 V anode-cathode bias conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
VDRM / VRRM	1400 V - Maximum repetitive peak forward/reverse blocking voltage; defines safe AC line voltage rating in 600–700 VAC systems with margin.
ITAVM	250 A at TC = 85 °C - Continuous DC-equivalent current per arm; determines heatsink sizing for steady-state conduction.
ITSM	9100 A (10 ms, Tvj = 25 °C) - Non-repetitive surge current handling; supports short-circuit protection coordination in motor drives.
VT0 / rT	0.8 V / 0.7 mΩ - Threshold voltage and slope resistance; sets conduction loss profile (PTAV ≈ 0.8·I + 0.0007·I²) at rated current.
RthJC	0.124 K/W per module - Junction-to-case thermal resistance; enables thermal modeling when mounted to actively cooled baseplate.
(diT/dt)cr	250 A/µs - Minimum required commutation di/dt to avoid false turn-on; dictates snubber design in inductive load switching.
VISOL	3.0 kV RMS (1 min) - Basic insulation withstand voltage; certifies isolation integrity between power terminals and baseplate.

Pinout & Package

TT251N14KOFHPSA1 is housed in an industrial-standard press-pack module with electrically insulated baseplate (AlN ceramic), 50 mm × 50 mm footprint, and M1 mechanical mounting (5 Nm torque). Terminals are arranged for dual-thyristor half-bridge configuration: two main AC terminals (A1/K2 and A2/K1), two isolated gate control terminals (G1, G2), and baseplate (isolated, thermally conductive).

Pin/Terminal	Circuit Role	Design Meaning
A1 / K2	Anode of Thyristor 1 / Cathode of Thyristor 2	Common AC line terminal for B2/B6 bridge input; carries full load current in single-phase or three-phase rectifier configurations.
A2 / K1	Anode of Thyristor 2 / Cathode of Thyristor 1	Complementary AC line terminal; forms anti-parallel pair enabling bidirectional conduction in AC phase control.
G1	Gate of Thyristor 1	Isolated low-energy trigger input (≤200 mA, ≤2.0 V); requires separate gate driver referenced to K1 potential.
G2	Gate of Thyristor 2	Isolated low-energy trigger input (≤200 mA, ≤2.0 V); requires separate gate driver referenced to K2 potential.
Baseplate	Thermal interface & electrical isolation barrier	Electrically isolated (3.0 kV RMS) copper base with AlN dielectric; serves as primary heat path to external heatsink.

Key Features

Feature	Design Value
Pressure contact technology	Eliminates wire bonds and solder joints - ensures stable contact resistance and >10⁶ thermal cycles under 125 °C junction operation.
Electrically insulated baseplate	AlN ceramic (Class I insulation) provides 3.0 kV RMS isolation and 17 mm creepage - enables direct mounting to grounded heatsinks without additional insulation.
High di/dt immunity	250 A/µs critical rate-of-rise prevents spurious turn-on during fast transients in motor drive commutation circuits.
Low thermal resistance	0.124 K/W RthJC enables >250 A continuous operation with <50 K temperature rise across standard 50 mm baseplate heatsinks.

Applications

Soft Starters

Rectifiers for Drives

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

IC Role / Device Role / Timing Role: Dual-thyristor phase-controlled AC switch regulating RMS output voltage via firing angle delay (30°–180°).

Use Value: Enables smooth acceleration without contactor wear; leverages 9100 A ITSM to survive locked-rotor surges.

Use Scenario: AC-to-DC conversion in variable-frequency drive front-ends with regenerative braking support.

IC Role / Device Role / Timing Role: Half-bridge thyristor pair in B6 six-pulse rectifier topology, synchronized to 50/60 Hz grid.

Use Value: Delivers 250 A ITAVM per arm at 85 °C case temperature; uses 0.124 K/W RthJC for efficient thermal coupling to liquid-cooled busbars.

Crowbar Protection

Static Switches

Use Scenario: Overvoltage protection in UPS and DC power supplies by shorting output to ground during fault events.

IC Role / Device Role / Timing Role: High-current thyristor triggered into full conduction to divert fault energy away from sensitive loads.

Use Value: 9100 A ITSM and 250 µs tq allow rapid activation and safe energy clamping without thermal runaway.

Use Scenario: Solid-state replacement of electromechanical contactors in HVAC, lighting, and industrial heating control.

IC Role / Device Role / Timing Role: Bidirectional AC switching element enabling zero-crossing or phase-angle control of resistive/inductive loads.

Use Value: Pressure-contact construction ensures >10⁷ operations at 250 A; 1400 V VDRM supports 480 VAC industrial mains.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TT251N16KOFHPSA1	Higher VDRM/VRRM (1600 V) and RthJC (0.130 K/W); identical ITAVM (250 A) and package.	Better suited for 690 VAC systems or higher-altitude installations requiring increased voltage margin.	Select when system peak line voltage exceeds 1000 V or long-term derating below 85 °C case is required.
TD251N14KOFHPSA1	Single-thyristor variant (not dual); same VDRM (1400 V), ITAVM (250 A), and thermal specs; different terminal layout.	Used in asymmetrical rectifier arms or unidirectional crowbar circuits where only one direction needs control.	Choose for cost-sensitive single-switch applications or when gate drive isolation simplification is prioritized over bidirectional control.

Compared with TT251N14KOFHPSA1, the TT251N16KOFHPSA1 offers higher voltage headroom but slightly reduced thermal efficiency, while the TD251N14KOFHPSA1 trades dual-arm flexibility for simpler gate drive and lower component count in unidirectional designs.

Availability

TT251N14KOFHPSA1 is available at Aetrix Electronics and suitable for soft starters, rectifiers for drives, crowbar protection circuits, and static switches requiring stable component supply, long-lifecycle support, and traceable industrial-grade sourcing.

Supply support for TT251N14KOFHPSA1 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 renewable energy markets.

This part belongs to Infineon's high-power thyristor module product line, engineered for ruggedized phase-angle control in industrial motor drives, UPS systems, and static power switching where reliability under high thermal and electrical stress is critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The TT251N14KOFHPSA1 supports continuous operation up to 85 °C case temperature (TC) at its rated 250 A ITAVM. Its maximum junction temperature is 125 °C, and thermal modeling must account for RthJC = 0.124 K/W plus external heatsink resistance to ensure Tvj stays within limit under worst-case load and ambient conditions.

Does this module require forced cooling?

Forced cooling (air or liquid) is strongly recommended above ~150 A ITAVM. At 250 A, natural convection is insufficient; the datasheet specifies thermal derating curves showing TC must be held ≤85 °C using a heatsink with RthCH ≤ 0.04 K/W per arm and adequate airflow or coolant flow to maintain junction temperature below 125 °C.

Can TT251N14KOFHPSA1 be used in three-phase six-pulse rectifier circuits?

Yes - two TT251N14KOFHPSA1 modules (each providing one complementary thyristor pair) can configure a full B6 six-pulse bridge. The module's 1400 V VDRM, 250 A ITAVM per arm, and 250 µs tq meet standard IEC 60747 requirements for such topologies operating up to 480 VAC line-to-line with 120° conduction.

What gate drive voltage and current are required for reliable triggering?

Reliable turn-on requires ≤2.0 V gate trigger voltage (VGT) and ≤200 mA gate trigger current (IGT) at 12 V anode-cathode bias and 25 °C. Gate pulses must exceed 20 µs duration and deliver ≥1 A peak current for latching; gate non-trigger thresholds (VGD ≤ 0.2 V, IGD ≤ 5 mA) ensure noise immunity in noisy industrial environments.

TT251N14KOFHPSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: Module

Packaging:: Bulk

Product Status:: Obsolete

Structure:: Series Connection - All SCRs

Number of SCRs, Diodes:: 2 SCRs

Voltage - Off State:: 1.4 kV

Current - On State (It (AV)) (Max):: 250 A

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):: 9100A @ 50Hz

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

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

TT251N14KOFHPSA1 FAQ

1.How can I place an order for TT251N14KOFHPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TT251N14KOFHPSA1 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 TT251N14KOFHPSA1 reliable?

The price and inventory of TT251N14KOFHPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TT251N14KOFHPSA1 is usually 5 days.

3.What payment methods are accepted for TT251N14KOFHPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TT251N14KOFHPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TT251N14KOFHPSA1?

TT251N14KOFHPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TT251N14KOFHPSA1 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 TT251N14KOFHPSA1?

For technical support, including TT251N14KOFHPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TT251N14KOFHPSA1 requirements.

6.How does Aetrix verify that TT251N14KOFHPSA1 is sourced from the original manufacturer or authorized distributors?

All TT251N14KOFHPSA1 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 TT251N14KOFHPSA1 meets industry standards.

7.What is the process for return or replacement of TT251N14KOFHPSA1?

All TT251N14KOFHPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with TT251N14KOFHPSA1, 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 TT251N14KOFHPSA1 part is unused and in its original packaging.

Return procedure for TT251N14KOFHPSA1:

1.Submit a request within 90 days.

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

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