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Infineon Technologies D1251S45TXPSA1
- Part No.:
- D1251S45TXPSA1
- Manufacturer:
- Infineon Technologies
- Category:
- Single Diodes
- Package:
- DO-200AC, K-PUK
- Datasheet:
-
D1251S45TXPSA1.pdf
- Description:
- DIODE GEN PURP 4.5KV 1530A
- Quantity:
- Payment:
- Shipping:
Inventory:6,504
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Product details
Overview
D1251S45TXPSA1 from Infineon Technologies (formerly EUPEC) is a high-power, two-sided cooled fast recovery diode designed for industrial rectification in medium-frequency DC-link and snubber circuits. It features 4500 V repetitive peak reverse voltage (VRRM), 2400 A RMS forward current (IFRMSM), and 1310 A mean forward current at 85°C case temperature, enabling use in high-voltage traction inverters and HVDC converter valves.
For engineers reviewing the D1251S45TXPSA1 datasheet, D1251S45TXPSA1 pinout, D1251S45TXPSA1 application, or D1251S45TXPSA1 equivalent, key selection criteria include junction-to-case thermal resistance (0.014 K/W two-sided), peak reverse recovery charge (Qrr = 3000 µAs), and surge current capability (18 kA IFSM at 140°C).
Technical Context
This diode employs a planar, diffusion-controlled silicon structure optimized for low conduction loss and controlled soft recovery. Its 0.45 mΩ forward slope resistance (rT) and 1.25 V threshold voltage (V(TO)) at 140°C support efficient high-current operation with minimal thermal runaway risk.
The device is rated for bidirectional mounting with symmetric thermal path design: anode and cathode sides each provide dedicated cooling interfaces. Its 500 A/µs repetitive decay rate (-di/dt)com and 800 A peak reverse recovery current (IRM) are validated under standardized snubber conditions (C = 3 µF, R = 4 Ω, vR(Spr) = 1000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 4500 V - supports DC-link voltages up to 3.3 kV in 2L/3L NPC converters without series stacking |
| IFRMSM | 2400 A - enables continuous operation in high-power rectifier bridges for wind turbine converters |
| RthJC (two-sided) | 0.014 K/W - allows direct double-side heatsink mounting for <1.5°C junction rise per kW dissipated |
| Qrr | 3000 µAs - limits switching losses and EMI in 500–2000 Hz forced-commutated applications |
| VF max | 2.5 V @ 2500 A, 140°C - ensures predictable forward drop under full-rated transient load |
| IFSM | 18000 A @ 140°C - withstands short-circuit currents in grid-tied inverters with 50 Hz half-wave stress |
| tvjmax | 140 °C - defines maximum allowable junction temperature during overload or derating scenarios |
Pinout & Package
Package: Press-pack, two-sided cooled, stud-mounted diode with anode and cathode terminals on opposite faces. Mechanical clamping force range: 15–36 kN. Weight: ~350 g. Air distance: ~10 mm. Creepage distance: 16 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top face) | High-side current entry point | Directly bonded to heatsink; requires insulated mounting when used in series-string configurations |
| Cathode (bottom face) | Low-side current exit point | Electrically isolated from heatsink unless explicitly grounded; enables symmetrical thermal management |
| Case (outer housing) | Structural and thermal interface | Non-conductive ceramic housing; provides mechanical rigidity and dielectric isolation between terminals |
Key Features
| Feature | Design Value |
|---|---|
| Two-sided cooling architecture | Enables 0.014 K/W total junction-to-case resistance with dual heatsink contact, reducing thermal bottleneck in >2 MW systems |
| Controlled soft recovery | Qrr = 3000 µAs and IRM = 800 A limit voltage overshoot and snubber stress in forced-commutation topologies |
| High surge robustness | 18 kA non-repetitive surge rating at 140°C supports fault ride-through in HVDC valve modules |
| Double-stud mechanical interface | 15–36 kN clamping force range ensures stable thermal contact and electrical integrity under vibration (50 Hz, 50 m/s²) |
Applications
| Wind Turbine Converter | HVDC Converter Valve |
|---|---|
Use Scenario: Rectification of generator AC output into stable DC link for modular multilevel converters (MMC) in offshore wind farms. IC Role / Device Role / Timing Role: Main power diode in anti-parallel configuration with IGBTs; handles 2–3 kHz switching transitions during reactive power control. Use Value: 2400 A IFRMSM and 0.014 K/W RthJC allow sustained operation at 98% load factor with ambient cooling at 40°C. | Use Scenario: DC-link protection and energy recycling in thyristor-based line-commutated HVDC valves. IC Role / Device Role / Timing Role: Snubber diode (D291S-compatible role) absorbing turn-off energy from series-connected thyristors during commutation failure. Use Value: 3000 µAs Qrr and 500 A/µs (-di/dt)com ensure reliable energy capture without secondary breakdown under 10 ms fault pulses. |
| Traction Inverter | Industrial Medium-Frequency Furnace |
Use Scenario: DC-link freewheeling and regeneration path in 3.3 kV railway traction inverters operating at 400–800 Hz PWM. IC Role / Device Role / Timing Role: Fast recovery diode in three-level NPC topology; conducts regenerative braking current during motor deceleration. Use Value: 4500 V VRRM and 1310 A IFAVM at 85°C enable direct integration without voltage derating in Class 3 insulation systems. | Use Scenario: High-current rectification in 1–10 kHz induction heating power supplies feeding parallel-resonant tank circuits. IC Role / Device Role / Timing Role: Primary rectifier in phase-controlled SCR/diode hybrid bridge; sustains 2.5 kA peak forward current with <2.5 V VF. Use Value: 0.45 mΩ rT and 1.25 V V(TO) minimize conduction loss and thermal drift across 0–100% load range. |
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 |
|---|---|---|---|
| DD900S45K3 | Higher VRRM (4500 V same), but lower IFRMSM (2000 A); RthJC = 0.017 K/W (two-sided) | Suitable for lower-current 2.5 MW converters where thermal margin is less constrained | Select if system peak current stays below 2000 A and existing heatsink interface matches DD900S45K3 footprint |
| SKKH 105/45 | Same VRRM (4500 V), lower IFRMSM (1800 A); uses single-sided cooling only (RthJC = 0.022 K/W) | Designed for legacy single-heatsink mounting; lacks bidirectional thermal symmetry | Choose only when retrofitting into existing single-cooled chassis with no redesign for dual-interface mounting |
Compared with D1251S45TXPSA1, DD900S45K3 trades 400 A RMS capacity for slightly higher thermal resistance, while SKKH 105/45 sacrifices both current rating and cooling flexibility-making D1251S45TXPSA1 optimal for new high-power, thermally demanding designs requiring two-sided thermal management.
Availability
D1251S45TXPSA1 is available at Aetrix Electronics and suitable for high-voltage rectification, HVDC valve modules, and traction inverter applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for D1251S45TXPSA1 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 AG is a German semiconductor manufacturer specializing in power semiconductors, microcontrollers, and sensor solutions for industrial, automotive, and energy infrastructure markets.
D1251S45TXPSA1 belongs to Infineon's high-power press-pack diode product line, engineered specifically for reliability-critical, high-current rectification in renewable energy conversion and grid-scale power electronics.
FAQ
What is the recommended clamping force for D1251S45TXPSA1 installation?
The specified mechanical clamping force range is 15–36 kN. A target value of 25 kN is recommended for optimal thermal contact and electrical integrity. Exceeding 36 kN risks ceramic housing fracture, while forces below 15 kN increase contact resistance and thermal impedance beyond rated RthJC.
Can D1251S45TXPSA1 be used in series string configurations?
Yes, but only with active voltage balancing using dynamic RC snubbers and matched static voltage sharing resistors. The device has no integrated voltage-sharing features; unbalanced strings may cause premature failure due to VRRM derating at elevated temperatures.
Is D1251S45TXPSA1 RoHS-compliant?
Yes, D1251S45TXPSA1 complies with EU RoHS Directive 2011/65/EU. Lead content is restricted to ≤0.1 wt%, and all six hazardous substances are within permissible limits. Full compliance documentation is available upon request through Aetrix Electronics' technical support portal.
What is the maximum allowable case temperature for continuous operation?
The maximum continuous case temperature is +85°C for rated IFAVM = 1310 A. Operation at tc = 70°C permits 1530 A mean forward current. Sustained case temperatures above +85°C require derating per the published thermal curves and must not exceed tvjmax = 140°C under any condition.
D1251S45TXPSA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- DO-200AC, K-PUK
- Packaging:
- Tray
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 4500 V
- Current - Average Rectified (Io):
- 1530A
- Voltage - Forward (Vf) (Max) @ If:
- 2.5 V @ 2500 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 80 mA @ 4500 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Clamp On
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -40°C ~ 140°C
D1251S45TXPSA1 FAQ
1.How can I place an order for D1251S45TXPSA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for D1251S45TXPSA1 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 D1251S45TXPSA1 reliable?
The price and inventory of D1251S45TXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D1251S45TXPSA1 is usually 5 days.
3.What payment methods are accepted for D1251S45TXPSA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D1251S45TXPSA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for D1251S45TXPSA1?
D1251S45TXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your D1251S45TXPSA1 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 D1251S45TXPSA1?
For technical support, including D1251S45TXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D1251S45TXPSA1 requirements.
6.How does Aetrix verify that D1251S45TXPSA1 is sourced from the original manufacturer or authorized distributors?
All D1251S45TXPSA1 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 D1251S45TXPSA1 meets industry standards.
7.What is the process for return or replacement of D1251S45TXPSA1?
All D1251S45TXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with D1251S45TXPSA1, 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 D1251S45TXPSA1 part is unused and in its original packaging.
Return procedure for D1251S45TXPSA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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