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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Infineon Technologies D740N44TXPSA1

Name: D740N44TXPSA1
Brand: Infineon Technologies
SKU: D740N44TXPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: D740N44TXPSA1

Manufacturer:: Infineon Technologies

Category:: Single Diodes

Package:: DO-200AB, B-PUK

Datasheet:: D740N44TXPSA1.pdf

Description:: DIODE GEN PURP 4.4KV 750A

Quantity:: RFQ Add To RFQ list

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Inventory:5,476

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Product details

Overview

D740N44TXPSA1 from Infineon Technologies is a high-power, press-pack silicon rectifier diode designed for industrial AC/DC conversion in medium-voltage drive systems and traction applications. It delivers 4400 V repetitive peak reverse voltage (VRRM), 1540 A RMS on-state current (IFRMSM), and 750 A average on-state current at TC = 100 °C, operating up to 160 °C junction temperature in two-sided cooled configurations.

For engineers reviewing the D740N44TXPSA1 datasheet, D740N44TXPSA1 pinout, D740N44TXPSA1 application, or D740N44TXPSA1 equivalent, key selection criteria include its 0.039 °C/W max junction-to-case thermal resistance (two-sided cooling), 2.94 V max forward voltage at 3 kA, and 14 kA surge current rating - critical for high-reliability line-commutated rectifiers in HVDC and rolling stock converters.

Technical Context

This device is a single-phase, non-controlled, axial-lead press-pack diode with symmetrical double-sided heat transfer capability. Its on-state characteristic follows a four-parameter logarithmic model (A=0.777, B=4.939×10⁻⁴, C=−1.975×10⁻², D=1.549×10⁻²) valid from 200 A to 4000 A at Tvj max.

Thermal performance is defined by analytical transient impedance ZthJC curves for anode-, cathode-, and two-sided cooling modes, with DC steady-state RthJC values ranging from 0.036 to 0.087 °C/W depending on mounting configuration and conduction angle. Reverse recovery charge Qr varies from 50 µAs to 10,000 µAs across di/dt from 1 to 10 A/µs at 0.5 VRRM.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	4400 V - Withstands repetitive reverse voltages up to 4.4 kV in line-commutated rectifier bridges without avalanche breakdown.
IFRMSM	1540 A - Maximum RMS on-state current under repetitive surge conditions, defining continuous conduction capability in 50/60 Hz applications.
IFAVM @ TC=100°C	750 A - Average forward current limit at 100 °C case temperature, used for thermal design of heatsink interfaces in forced-air or liquid-cooled systems.
vF max @ 3 kA	2.94 V - Peak forward voltage at 3 kA and Tvj max, directly determining conduction loss (P ≈ 2.94 × I) in high-current rectification stages.
RthJC max (two-sided)	0.039 °C/W - Maximum junction-to-case thermal resistance with dual-side clamping, enabling >1 kW dissipation per degree of temperature rise.
IFSM @ 10 ms	14000 A - Non-repetitive surge current rating at Tvj = 25 °C, supporting short-circuit withstand in motor drive DC links.
I²t @ 10 ms	980 × 10³ A²s - Fusing energy integral, used to coordinate upstream fuse sizing for protection against catastrophic overcurrent events.

Pinout & Package

Package: Press-pack, double-sided cooled, axial terminal configuration with isolated anode and cathode contact surfaces. Clamping force range: 10–24 kN. Typical weight: 280 g. Creepage distance: 25 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	High-side current entry point	Press-contact surface accepting compressive load; must be mounted to heatsink with ≥10 kN force for specified RthJC.
Cathode	Low-side current exit point	Press-contact surface electrically and thermally isolated from anode; requires identical clamping for balanced thermal path.

Key Features

Feature	Design Value
Double-sided thermal interface	Enables 0.039 °C/W RthJC with symmetric heatsink mounting, reducing total thermal resistance by ~40% vs. single-sided cooling.
High VRRM / low vF trade-off	4400 V blocking with only 2.94 V forward drop at 3 kA - optimized for efficiency in 3.3 kV–4.5 kV industrial rectifier stacks.
Robust surge rating	14 kA IFSM at 10 ms supports fault ride-through in grid-connected converters without immediate failure.
Controlled reverse recovery	Qr = 100–10,000 µAs across di/dt range - predictable soft recovery behavior reduces snubber stress in phase-controlled thyristor-diode hybrids.

Applications

Industrial Medium-Voltage Drives

Railway Traction Converters

Use Scenario: Line-commutated rectification in 3.3 kV AC-fed variable-frequency drives for large pumps and compressors.

IC Role / Device Role / Timing Role: Uncontrolled power conversion stage converting 3-phase AC to DC bus, operating at 50/60 Hz with 180° conduction.

Use Value: 750 A average current rating at 100 °C case temperature enables compact heatsink design while maintaining >98.5% conversion efficiency at full load.

Use Scenario: Auxiliary power supply rectification in diesel-electric locomotive main converter cabinets.

IC Role / Device Role / Timing Role: High-reliability DC link charging diode in parallel-configured rectifier bridges exposed to vibration and wide ambient temperature swings.

Use Value: −40 °C to +160 °C operating range and 280 g mass support mechanical robustness and thermal stability in rail-certified enclosures.

HVDC Converter Valves

Grid-Scale Static VAR Compensators

Use Scenario: Valve-level freewheeling and commutation diodes in 400 kV–800 kV LCC-HVDC converter stations.

IC Role / Device Role / Timing Role: Bidirectional thermal path component in press-pack thyristor/diode modules, handling 10 ms surge currents during fault clearing.

Use Value: 980 × 10³ A²s I²t rating allows coordination with 400 ms–2 s fast-acting DC circuit breakers without thermal runaway.

Use Scenario: Reactive power compensation in 138 kV substation SVCs using thyristor-switched reactors with anti-parallel diode clamps.

IC Role / Device Role / Timing Role: Snubberless reverse conduction path during zero-crossing switching transitions in TCR legs.

Use Value: Predictable Qr vs. di/dt behavior (50–10,000 µAs) eliminates need for external RC snubbers, reducing system footprint and failure points.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DD740N44K	Same VRRM (4400 V) and IFRMSM (1540 A), but uses older IFBIP-D package with higher RthJC (0.042 °C/W two-sided) and no published Qr vs. di/dt data.	Limited to legacy designs where qualification documentation matches prior-generation test reports.	Select only when backward compatibility with existing mechanical tooling and thermal models is mandatory.
D750N44TXPSA1	Identical package and thermal specs, but rated for 4800 V VRRM and 1660 A IFRMSM - higher voltage margin and 7.8% higher RMS current capacity.	Suitable for new designs requiring extended insulation coordination or future-proofing against grid overvoltage transients.	Prefer for new designs targeting >4.2 kV system-level isolation or needing headroom for derating in harsh environments.

Compared with DD740N44K, D740N44TXPSA1 offers verified Qr characterization and tighter thermal resistance; versus D750N44TXPSA1, it trades 400 V margin and 120 A RMS capacity for lower cost and proven field reliability in 4.4 kV-rated systems.

Availability

D740N44TXPSA1 is available at Aetrix Electronics and suitable for industrial medium-voltage drives, railway traction converters, and HVDC converter valves requiring stable component supply with long-term lifecycle assurance.

Supply support for D740N44TXPSA1 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 industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

This part belongs to Infineon's high-power press-pack diode product line, engineered specifically for line-commutated rectification in utility-scale energy conversion systems where reliability under extreme thermal and electrical stress is non-negotiable.

FAQ

What is the recommended clamping force for D740N44TXPSA1 installation?

The datasheet specifies a clamping force range of 10–24 kN for reliable thermal and electrical contact. Using ≤10 kN risks exceeding the 0.039 °C/W RthJC spec due to interfacial voids; exceeding 24 kN may deform the copper terminals or compromise internal Si-pellet bonding. Torque-controlled hydraulic presses are recommended for repeatable assembly in production.

Can D740N44TXPSA1 be used in single-sided cooled configurations?

Yes - the datasheet provides separate RthJC max values for anode-sided (0.066 °C/W), cathode-sided (0.087 °C/W), and two-sided (0.039 °C/W) cooling. Single-sided use reduces RMS current capability: IFRMSM drops to 1220 A (anode-cooled) or 1050 A (cathode-cooled) due to higher thermal resistance and localized hot-spot formation.

Does D740N44TXPSA1 have a specified reverse recovery time (trr)?

No - the datasheet does not specify trr. Instead, it characterizes reverse recovery via recovered charge (Qr) across di/dt (1–10 A/µs) and peak reverse voltage (0.33–0.67 VRRM). This reflects its design intent for line-frequency applications where Qr governs snubber sizing and EMI, not switching speed.

Is D740N44TXPSA1 compliant with AEC-Q101 or automotive standards?

No - this device is qualified per industrial and power infrastructure requirements (IEC 60747-2, EN 60747-2), not AEC-Q101. Its −40 °C to +160 °C operating range overlaps automotive extremes, but it lacks automotive-specific stress testing (e.g., board-level thermal cycling, humidity bias HAST) and is not listed in Infineon's AEC-Q101 qualified portfolio.

D740N44TXPSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: DO-200AB, B-PUK

Packaging:: Tray

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 4400 V

Current - Average Rectified (Io):: 750A

Voltage - Forward (Vf) (Max) @ If:: 1.45 V @ 700 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 70 mA @ 4400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Clamp On

Supplier Device Package:: -

Operating Temperature - Junction:: -40°C ~ 160°C

D740N44TXPSA1 FAQ

1.How can I place an order for D740N44TXPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for D740N44TXPSA1 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 D740N44TXPSA1 reliable?

The price and inventory of D740N44TXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D740N44TXPSA1 is usually 5 days.

3.What payment methods are accepted for D740N44TXPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D740N44TXPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D740N44TXPSA1?

D740N44TXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D740N44TXPSA1 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 D740N44TXPSA1?

For technical support, including D740N44TXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D740N44TXPSA1 requirements.

6.How does Aetrix verify that D740N44TXPSA1 is sourced from the original manufacturer or authorized distributors?

All D740N44TXPSA1 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 D740N44TXPSA1 meets industry standards.

7.What is the process for return or replacement of D740N44TXPSA1?

All D740N44TXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with D740N44TXPSA1, 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 D740N44TXPSA1 part is unused and in its original packaging.

Return procedure for D740N44TXPSA1:

1.Submit a request within 90 days.

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

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