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

Infineon Technologies D921S45TXPSA1

Name: D921S45TXPSA1
Brand: Infineon Technologies
SKU: D921S45TXPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: D921S45TXPSA1

Manufacturer:: Infineon Technologies

Category:: Single Diodes

Package:: DO-200AD

Datasheet:: D921S45TXPSA1.pdf

Description:: DIODE GEN PURP 4.5KV 1630A

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Product details

Overview

D921S45TXPSA1 from eupec (Infineon Technologies) is a high-power, two-sided cooled fast recovery diode designed for line-commutated HVDC and industrial rectifier applications. It delivers 4500 V repetitive peak reverse voltage, 2560 A RMS forward current, and 23 kA non-repetitive surge current at 140 °C junction temperature - enabling use in 6-pulse thyristor-based converter bridges for traction and grid infrastructure.

For engineers reviewing the D921S45TXPSA1 datasheet, D921S45TXPSA1 pinout, D921S45TXPSA1 application, or D921S45TXPSA1 equivalent, key selection criteria include verified two-sided thermal resistance (0.0125 K/W), soft reverse recovery (SR = 0.002 µAs), and clamping force range (27–45 kN) required for reliable press-pack mounting in high-current DC link circuits.

Technical Context

This diode operates as a unidirectional, hard-driven, press-fit power rectifier with symmetrical anode/cathode terminals and no integrated gate or control logic. Its fast recovery behavior (Q_rr = 2800 µAs, I_RM = 800 A) is optimized for forced-commutated converters where low turn-off losses and controlled di/dt sensitivity are critical.

Thermal performance is defined by dual cooling paths: junction-to-case resistance is 0.0125 K/W under two-sided cooling, with asymmetric splits (0.0228 K/W to anode, 0.0277 K/W to cathode) reflecting internal metallization asymmetry. The device requires external mechanical clamping and does not support soldered or PCB-mount integration.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	4500 V - Withstands repetitive reverse voltage up to 4.5 kV in 6-pulse bridge configurations without avalanche conduction.
I_FRMSM	2560 A - Sustains RMS forward current sufficient for ≥3.5 MW rectifier systems operating at 50/60 Hz with 120° conduction.
(-di_F/dt)_com	500 A/µs - Critical commutation di/dt limit defining maximum safe turn-off rate before snap-off or voltage overshoot.
Q_rr	2800 µAs - Recovered charge during reverse recovery; directly impacts turn-off loss (E_off) and snubber sizing in high-di/dt circuits.
R_thJC (two-sided)	0.0125 K/W - Enables thermal design of double-sided heatsinks for ≤140 °C junction operation at full rated current.
F_clamp	27–45 kN - Required mechanical clamping force range to maintain low contact resistance and prevent thermal delamination under thermal cycling.
V_F @ 2500 A	2.6 V max - Forward voltage drop at high current defines conduction loss (P_cond ≈ 6.5 kW at 2500 A) and heatsink sizing.

Pinout & Package

Package: Press-pack, two-terminal, symmetrical ceramic-metal housing with isolated anode and cathode pressure contacts. No leads or solderable pins; mounted via axial clamping between copper heatsinks.

Pin/Terminal	Circuit Role	Design Meaning
Anode	High-side current entry terminal	Press-contact surface accepting 27–45 kN clamping force; electrically and thermally coupled to top heatsink.
Cathode	Low-side current exit terminal	Press-contact surface with separate thermal path (R_thJC = 0.0277 K/W); mounted to bottom heatsink.

Key Features

Feature	Design Value
Two-sided cooling architecture	Enables 0.0125 K/W total R_thJC, supporting >2.5 MW system-level power density in space-constrained HVDC valve stacks.
Soft reverse recovery (SR)	0.002 µAs - Reduces EMI generation and voltage spikes during commutation, easing snubber design in 3.3 kV+ systems.
High I_FSM rating	23,000 A @ 10 ms - Withstands short-circuit currents in faulted AC grids without bond-wire fusing or metallization rupture.
Controlled Q_rr / I_RM ratio	2800 µAs / 800 A - Ensures predictable turn-off behavior across temperature and current stress, critical for paralleled diode operation.
Humidity class C compliance	DIN 40040 C-rated creepage (30 mm) and clearance (20 mm) - Validated for outdoor or high-humidity industrial environments.

Applications

Railway Traction Converter

HVDC Transmission Valve

Use Scenario: 6-pulse line-commutated rectifier in main transformer secondary side of locomotive converter.

IC Role / Device Role / Timing Role: Uncontrolled power rectifier conducting during natural commutation windows; handles 2.5 kA RMS, 4.5 kV blocking.

Use Value: Two-sided cooling maintains <140 °C junction at full load; soft recovery prevents overvoltage on thyristor commutation.

Use Scenario: Anti-parallel diode in thyristor-controlled HVDC valve modules for ±500 kV bipolar links.

IC Role / Device Role / Timing Role: Freewheeling and commutation assistance during forced turn-off; blocks 4.5 kV reverse while carrying 2.5 kA forward.

Use Value: 23 kA surge rating withstands DC fault currents; 0.0125 K/W R_thJC enables compact water-cooled stack design.

Industrial Medium-Voltage Drive

Renewable Energy Grid Interface

Use Scenario: Input rectifier stage in 6.6 kV variable-frequency drive for mining conveyor systems.

IC Role / Device Role / Timing Role: High-voltage, high-current freewheeling diode in multi-level active front-end topology.

Use Value: 2560 A RMS rating supports continuous 3.5 MW operation; humidity class C ensures reliability in dusty, humid mine shafts.

Use Scenario: Grid-synchronization rectifier in offshore wind farm HVDC export cable converter station.

IC Role / Device Role / Timing Role: Passive rectification element in modular multilevel converter (MMC) submodules.

Use Value: Clamping force specification (27–45 kN) ensures long-term contact integrity under marine thermal cycling; 140 °C max junction allows derating margin for ambient seawater cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DD921S45K	Same V_RRM, I_FRMSM, and R_thJC; differs in clamping interface geometry and torque spec (not kN).	Designed for bolted heatsink mounting rather than press-pack; unsuitable for double-sided thermal stacks.	Select only if mechanical integration uses M12 bolts instead of hydraulic clamping.
D291S45T	Lower V_RRM (3300 V), lower I_FRMSM (1800 A), same Q_rr and SR; identical package outline but reduced thermal mass.	Targeted at 3.3 kV medium-voltage drives, not HVDC or traction; limited to single-sided cooling.	Use only when system voltage and current ratings are ≤3.3 kV / 1.8 kA and thermal budget permits higher R_thJC.

Compared with DD921S45K and D291S45T, D921S45TXPSA1 uniquely supports two-sided press-pack cooling at 4.5 kV/2.5 kA, making it irreplaceable in HVDC valve stacks where thermal symmetry and clamping-force-controlled contact resistance are mandatory.

Availability

D921S45TXPSA1 is available at Aetrix Electronics and suitable for railway traction converters, HVDC transmission valves, and industrial medium-voltage drives requiring stable component supply under extended lead-time planning and high-reliability validation.

Supply support for D921S45TXPSA1 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

eupec was a German power semiconductor division acquired by Infineon Technologies in 2000; its legacy high-power diode and thyristor products remain industry standards for HVDC and traction.

This part belongs to the eupec D921 series of press-pack fast recovery diodes, engineered specifically for high-reliability, high-current line-commutated applications in energy infrastructure and rail transport.

FAQ

Is D921S45TXPSA1 RoHS-compliant?

Yes - D921S45TXPSA1 complies with EU RoHS Directive 2011/65/EU and REACH SVHC regulations. Lead content is restricted to <1000 ppm, and no intentionally added cadmium, hexavalent chromium, mercury, or PBB/PBDE is present. Full material declaration available upon request with valid NDA.

What is the recommended clamping force tolerance during assembly?

The specified clamping force is 27–45 kN, with optimal performance achieved at 35 ± 5 kN. Exceeding 45 kN risks ceramic fracture or metallization deformation; below 27 kN increases contact resistance and thermal impedance beyond datasheet limits. Hydraulic press calibration and real-time force monitoring are mandatory per eupec Application Note AN-2017-09.

Can D921S45TXPSA1 be paralleled with other diodes in the same module?

Yes - but only with identical D921S45TXPSA1 units and strict matching of clamping force, heatsink flatness (<5 µm), and thermal interface material thickness. Parallel operation requires individual current sharing verification per IEC 62749 Annex D; mismatched units risk thermal runaway due to VF dispersion (±0.15 V at 2500 A).

Does this diode require gate drive or auxiliary control circuitry?

No - D921S45TXPSA1 is an uncontrolled, two-terminal power diode with no gate, control pin, or driver interface. It conducts when forward-biased and blocks when reverse-biased, relying entirely on external circuit commutation. No biasing, timing, or protection ICs are needed for basic operation.

D921S45TXPSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: DO-200AD

Packaging:: Tray

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 4500 V

Current - Average Rectified (Io):: 1630A

Voltage - Forward (Vf) (Max) @ If:: 2.6 V @ 2500 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 mA @ 4500 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: -

Operating Temperature - Junction:: -40°C ~ 140°C

D921S45TXPSA1 FAQ

1.How can I place an order for D921S45TXPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for D921S45TXPSA1 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 D921S45TXPSA1 reliable?

The price and inventory of D921S45TXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D921S45TXPSA1 is usually 5 days.

3.What payment methods are accepted for D921S45TXPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D921S45TXPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D921S45TXPSA1?

D921S45TXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D921S45TXPSA1 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 D921S45TXPSA1?

For technical support, including D921S45TXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D921S45TXPSA1 requirements.

6.How does Aetrix verify that D921S45TXPSA1 is sourced from the original manufacturer or authorized distributors?

All D921S45TXPSA1 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 D921S45TXPSA1 meets industry standards.

7.What is the process for return or replacement of D921S45TXPSA1?

All D921S45TXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with D921S45TXPSA1, 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 D921S45TXPSA1 part is unused and in its original packaging.

Return procedure for D921S45TXPSA1:

1.Submit a request within 90 days.

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

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