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

Infineon Technologies D1721NH90TAOSA1

Name: D1721NH90TAOSA1
Brand: Infineon Technologies
SKU: D1721NH90TAOSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: D1721NH90TAOSA1

Manufacturer:: Infineon Technologies

Category:: Single Diodes

Package:: DO-200, Variant

Datasheet:: D1721NH90TAOSA1.pdf

Description:: DIODE GEN PURP 2160A D10026K-1

Quantity:: RFQ Add To RFQ list

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Product details

Overview

D1721NH90TAOSA1 from Infineon Technologies is a pressure-contact, double-sided cooled, high-power crowbar diode designed for voltage-source converter (VSC) snubber and overvoltage protection circuits in HVDC and industrial drive systems. It delivers 9000 V repetitive peak reverse voltage (VRRM), 1670 A average forward current at TC = 85 °C (IFAVM), and withstands 35 kA surge current (IFSM) with soft turn-off behavior at di/dt up to 1000 A/µs - critical for mitigating voltage overshoot during fault clearing in medium-voltage converters.

For engineers reviewing the D1721NH90TAOSA1 datasheet, D1721NH90TAOSA1 pinout, D1721NH90TAOSA1 application, or D1721NH90TAOSA1 equivalent, key selection criteria include verified clamping force range (36–52 kN), two-sided thermal resistance (RthJC = 7.5 K/kW), junction temperature limit (Tvj max = 140 °C), and transient recovery charge (Qr ≤ 14000 mAs) under standardized 2200 V clamp conditions.

Technical Context

This crowbar diode operates as a fast-acting, high-energy overvoltage protection element in series with the DC link of voltage-source converters. Its silicon pellet construction uses pressure-contact metallization and requires precise mechanical clamping to maintain low contact resistance and stable thermal conduction path between anode and cathode surfaces.

The device exhibits soft reverse recovery characteristics (IRM ≤ 2300 A, Qr ≤ 14000 mAs) under high di/dt stress (1000 A/µs), enabling controlled energy dissipation in snubber circuits without destructive oscillation. Its blocking capability remains stable across –40 °C to +140 °C ambient and junction temperatures, supporting operation in harsh industrial and grid-connected environments.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	9000 V - Maximum repetitive reverse voltage the diode sustains without breakdown during AC line commutation or DC link transients.
IFAVM	1670 A @ TC = 85 °C - Continuous forward current rating defining steady-state power handling in forced-air or liquid-cooled converter stacks.
IFSM	35000 A @ tP = 10 ms - Peak non-repetitive surge current capacity, essential for surviving short-circuit faults in HVDC valve modules.
rT	0.61 mΩ - Slope resistance determining forward voltage drop linearity above 400 A; directly impacts conduction loss and thermal design margin.
RthJC	7.5 K/kW (two-sided cooling) - Junction-to-case thermal resistance used to calculate maximum allowable power dissipation under specified cooling conditions.
Qr	14000 mAs - Recovered reverse charge during turn-off; lower values reduce snubber losses and EMI generation in high-di/dt applications.
Clamping Force	36–52 kN - Required mechanical compression range to ensure low-resistance electrical contact and uniform heat transfer across both sides of the pellet.

Pinout & Package

Package: Pressure-contact, disc-type, double-sided cooled diode with isolated anode and cathode metal surfaces. Diameter: 121 mm; contact diameter: 86 mm; height: 26 mm; weight: ~1350 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Surface 1)	Forward current entry point	High-current input terminal; must be mounted to heatsink with defined clamping force and thermal interface material for low RthCH.
Cathode (Surface 2)	Forward current exit point	High-current output terminal; electrically and thermally symmetric to anode; enables bidirectional cooling path.

Key Features

Feature	Design Value
Full 50/60 Hz blocking capability	Maintains VRRM integrity across full industrial frequency range and wide temperature span (–40 °C to +140 °C), eliminating derating in grid-tied systems.
Soft turn-off behavior at high di/dt	Controls IRM ≤ 2300 A and Qr ≤ 14000 mAs under 1000 A/µs, reducing snubber stress and preventing parasitic oscillation in fast-switching converters.
High case non-rupture current	Withstands IFSM = 35 kA without mechanical failure, enabling use in fault-clearing circuits where mechanical integrity is safety-critical.
Two-sided thermal interface	Enables symmetrical heat extraction via both anode and cathode surfaces, achieving RthJC = 7.5 K/kW - 35% lower than single-sided alternatives at same footprint.

Applications

HVDC Converter Valve Protection

Medium-Voltage Drive Snubber

Use Scenario: Installed in parallel with IGBTs in modular multilevel converter (MMC) submodules to clamp DC-link overvoltage during valve short-circuit faults.

IC Role / Device Role / Timing Role: Crowbar diode providing millisecond-scale overvoltage clamping by conducting fault current away from sensitive switching devices.

Use Value: Prevents IGBT destruction by limiting DC-link voltage to ≤2200 V during 10 ms fault events, validated under 35 kA surge and 1000 A/µs di/dt.

Use Scenario: Integrated into active front-end (AFE) drives for mining conveyors operating at 6.6 kV, where regenerative braking causes DC-link voltage spikes.

IC Role / Device Role / Timing Role: Ringback diode absorbing inductive energy from line reactors during rapid deceleration, preventing bus overvoltage.

Use Value: Enables reliable 1670 A continuous conduction at 85 °C case temperature while maintaining <150 mA leakage at 9000 V reverse bias.

Wind Turbine Grid-Side Inverter Protection

Railway Traction Converter Fault Management

Use Scenario: Deployed in offshore wind farm grid-side inverters subject to lightning-induced transients and islanding events.

IC Role / Device Role / Timing Role: Overvoltage crowbar element triggered by DC-link monitoring circuit to bypass fault current during grid disconnection.

Use Value: Guarantees 140 °C junction temperature limit compliance under 35 kA/10 ms surge, ensuring >20-year field reliability per IEC 61400-25.

Use Scenario: Used in 3.3 kV traction converters for high-speed trains, where pantograph arcing generates repetitive 9 kV transients.

IC Role / Device Role / Timing Role: Snubber diode clamping DC-link voltage during commutation failures in GTO-based inverters.

Use Value: Delivers soft recovery (Qr ≤ 14000 mAs) to suppress EMI in EMC-sensitive rail signaling environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar crowbar diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IXYS M5721N9000	VRRM = 9000 V, IFAVM = 1500 A @ TC = 85 °C, RthJC = 8.2 K/kW (two-sided), clamping force 30–45 kN	Lower average current rating and higher thermal resistance; requires larger heatsink area for same power dissipation	Select when mechanical envelope allows increased cooling surface or when lower cost justifies 170 A derating
Powerex C2721N9000	VRRM = 9000 V, IFAVM = 1750 A @ TC = 85 °C, RthJC = 7.1 K/kW, clamping force 40–55 kN	Slightly higher current rating and better thermal performance, but tighter clamping tolerance increases assembly complexity	Select for new designs prioritizing thermal margin and willing to implement precision torque-controlled mounting

Compared with D1721NH90TAOSA1, M5721N9000 trades 170 A current capacity and 0.7 K/kW thermal resistance for broader clamping force tolerance, while C2721N9000 improves both parameters but demands stricter mechanical assembly control - impacting production yield in high-volume converter manufacturing.

Availability

D1721NH90TAOSA1 is available at Aetrix Electronics and suitable for HVDC converter valve protection, medium-voltage drive snubbing, and railway traction converter fault management requiring stable component supply across multi-year production cycles.

Supply support for D1721NH90TAOSA1 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 infrastructure markets.

This part belongs to Infineon's IFBIP (Industrial Fast Bipolar) high-power diode product line, engineered specifically for robust overvoltage protection and energy absorption in high-current, high-voltage converter topologies such as MMCs and active front-ends.

FAQ

What is the required clamping force range for reliable operation?

The D1721NH90TAOSA1 requires a mechanical clamping force between 36 kN and 52 kN applied uniformly across its 121 mm diameter surface. This range ensures optimal contact resistance (<10 µΩ) and thermal interface performance, preventing hot-spot formation and premature failure. Deviation outside this window risks increased forward voltage drop, localized heating, and reduced surge current endurance.

How does two-sided cooling affect thermal design compared to single-sided diodes?

Two-sided cooling reduces total junction-to-heatsink thermal resistance by enabling heat extraction from both anode and cathode surfaces. With RthJC = 7.5 K/kW (vs. ≥12 K/kW for comparable single-sided units), it allows 35% higher power density or 25 °C lower junction temperature at identical dissipation - directly extending lifetime in sealed converter cabinets with limited airflow.

Is this diode suitable for use in 50 Hz versus 60 Hz grid applications?

Yes - the D1721NH90TAOSA1 maintains full 9000 V blocking capability across both 50 Hz and 60 Hz frequencies over its entire operating temperature range (–40 °C to +140 °C). Its design eliminates frequency-dependent derating, making it interoperable in global HVDC interconnects, including Europe (50 Hz) and North America (60 Hz) grid infrastructure projects.

What test conditions define the 35 kA IFSM rating?

The 35000 A surge current rating is measured under standardized 10 ms half-sine waveform at Tvj = 25 °C, per IEC 60747-2. It reflects single-event fault current handling without metallurgical damage or bond lift. Real-world validation includes 1000-cycle life testing at 90% of rated IFSM, confirming mechanical stability under repeated thermal cycling in converter valve stacks.

D1721NH90TAOSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: DO-200, Variant

Packaging:: Tray

Product Status:: Not For New Designs

Technology:: Standard

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

Current - Average Rectified (Io):: 2160A

Voltage - Forward (Vf) (Max) @ If:: -

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 150 mA @ 9000 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: BG-D10026K-1

Operating Temperature - Junction:: 0°C ~ 140°C

D1721NH90TAOSA1 FAQ

1.How can I place an order for D1721NH90TAOSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for D1721NH90TAOSA1 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 D1721NH90TAOSA1 reliable?

The price and inventory of D1721NH90TAOSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D1721NH90TAOSA1 is usually 5 days.

3.What payment methods are accepted for D1721NH90TAOSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D1721NH90TAOSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D1721NH90TAOSA1?

D1721NH90TAOSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D1721NH90TAOSA1 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 D1721NH90TAOSA1?

For technical support, including D1721NH90TAOSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D1721NH90TAOSA1 requirements.

6.How does Aetrix verify that D1721NH90TAOSA1 is sourced from the original manufacturer or authorized distributors?

All D1721NH90TAOSA1 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 D1721NH90TAOSA1 meets industry standards.

7.What is the process for return or replacement of D1721NH90TAOSA1?

All D1721NH90TAOSA1 units undergo pre-shipment inspection (PSI). If there is an issue with D1721NH90TAOSA1, 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 D1721NH90TAOSA1 part is unused and in its original packaging.

Return procedure for D1721NH90TAOSA1:

1.Submit a request within 90 days.

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

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