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Vishay General Semiconductor - Diodes Division 400DMQ045
- Part No.:
- 400DMQ045
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Diode Arrays
- Package:
- TO-244AB
- Datasheet:
-
400DMQ045.pdf
- Description:
- DIODE MOD SCHOT 45V 400A TO244AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,485
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Product details
Overview
400DMQ045 from Infineon Technologies is a high-current Schottky rectifier doubler module optimized for low forward voltage drop (0.52 V @ 200 A, TJ = 125°C), 45 V maximum DC reverse voltage, and operation up to 150°C junction temperature - used as freewheeling diodes in high-power welding inverters and reverse-battery protection circuits.
For engineers reviewing the 400DMQ045 datasheet, 400DMQ045 pinout, 400DMQ045 application, or 400DMQ045 equivalent, key selection criteria include its isolated TO-244AB package, 29,000 A non-repetitive surge rating, per-leg thermal resistance of 0.4°C/W, and 10,300 pF junction capacitance at 5 V.
Technical Context
This device integrates two independent Schottky rectifier dies in a single isolated TO-244AB package, enabling dual-leg parallel or half-bridge freewheeling configurations. Each leg supports 400 A average forward current (rectangular waveform, 50% duty cycle, TC = 70°C) and withstands 10,000 V/µs dv/dt without commutation failure.
Proprietary barrier technology ensures stable leakage performance (1 A @ 125°C, rated VR) and ruggedness via integrated guard ring. Thermal design relies on low RthJC (0.4°C/W per leg) and RthCS (0.1°C/W to heatsink), with epoxy encapsulation rated for industrial moisture resistance and mechanical shock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum DC reverse blocking voltage per leg; defines safe operating range in battery-protection and DC-link clamp applications. |
| IF(AV) | 400 A - Average forward current per device (not per leg); requires heatsinking to maintain TC ≤ 70°C under 50% duty rectangular waveform. |
| VF @ 200A | 0.52 V - Forward voltage drop per leg at 200 A and TJ = 125°C; directly determines conduction loss in high-efficiency welder output stages. |
| IFSM | 29,000 A - Peak non-repetitive surge current per leg for 5 µs sine pulse; enables robust short-circuit handling in inverter DC bus protection. |
| RthJC | 0.4 °C/W - Thermal resistance from junction to case per leg; sets minimum heatsink requirement for continuous 400 A operation. |
| CT | 10,300 pF - Junction capacitance per leg at VR = 5 V; impacts high-frequency switching losses and EMI in >20 kHz SMPS designs. |
| TJ Range | −55 to +150 °C - Full operational junction temperature range; supports under-hood and industrial ambient environments without derating. |
Pinout & Package
Package: TO-244AB isolated doubler - modified JEDEC outline with electrically isolated baseplate, dual anode/cathode terminals, and center-mounting hole. Designed for bolt-down heatsinking with 24–35 kg·cm torque.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 (A1) | Input terminal for Leg 1 | Connects to high-side switch node in freewheeling path; rated for full 400 A IF(AV) per device. |
| Cathode 1 (K1) | Output terminal for Leg 1 | Common cathode return for Leg 1; electrically isolated from K2 and baseplate per datasheet isolation rating. |
| Anode 2 (A2) | Input terminal for Leg 2 | Enables dual-leg parallel configuration or independent half-bridge leg; shares same thermal path as A1. |
| Cathode 2 (K2) | Output terminal for Leg 2 | Independent cathode node; allows split-rail or interleaved converter topologies without shared conduction path. |
| Baseplate | Thermal & electrical reference | Electrically isolated from all terminals (≥2500 V RMS); serves as primary heatsink interface with 0.1 °C/W RthCS when greased and smooth. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF Schottky architecture | 0.52 V @ 200 A, 125°C - reduces conduction loss by ≥30% vs. comparable Si fast recovery diodes in 10–50 kHz welder outputs. |
| 150°C junction rating | Full specification compliance up to TJ = 150°C - eliminates derating in enclosed industrial enclosures with limited airflow. |
| Guard ring ruggedization | Enhanced edge termination prevents premature avalanche breakdown during repetitive line transients in motor drive DC links. |
| High-purity epoxy encapsulation | Moisture-resistant, high-temperature molding compound - meets IPC-J-STD-020 MSL 1 and supports 10+ year field life in humid environments. |
| Isolated TO-244AB package | Baseplate isolation ≥2500 V RMS - enables direct mounting to grounded heatsinks without additional insulation hardware. |
Applications
| Welding Inverter Output Stage | Industrial UPS DC Bus Clamp |
|---|---|
Use Scenario: High-current freewheeling path in IGBT-based inverter output stage of 3-phase arc welders operating at 20–30 kHz. IC Role / Device Role / Timing Role: Dual-leg Schottky rectifier providing bidirectional energy recirculation during IGBT turn-off; operates in hard-switched mode with <100 ns recovery. Use Value: 0.52 V VF minimizes power loss at 400 A average current, reducing heatsink size by 40% versus Si alternatives while maintaining 150°C operation. | Use Scenario: Reverse-polarity protection and DC bus clamping in three-phase online UPS systems with 400–600 V DC link. IC Role / Device Role / Timing Role: Bidirectional clamping diode across DC link capacitors; absorbs regenerative energy during battery charging transients. Use Value: 29,000 A IFSM rating handles 10 ms grid-fault surges without failure; isolated baseplate simplifies grounding in floating DC bus architectures. |
| Reverse Battery Protection | High-Power Motor Drive Freewheeling |
Use Scenario: Polarity reversal protection in 24/48 V battery-powered heavy-duty vehicle control modules. IC Role / Device Role / Timing Role: Series-connected Schottky doubler acting as low-loss, high-current OR-ing diode; blocks reverse current during accidental battery misconnection. Use Value: 45 V VRRM exceeds 48 V system max, while 0.52 V VF limits voltage drop to <0.6 V at 200 A - preserving MCU supply stability during cranking. | Use Scenario: Freewheeling path in 100 kW servo drives using 1200 V SiC MOSFETs switching at 50 kHz. IC Role / Device Role / Timing Role: Low-inductance (5.0 nH/leg), low-Ct (10,300 pF) Schottky pair minimizing switching oscillation and EMI generation. Use Value: 10,000 V/µs dv/dt rating prevents false turn-on during fast SiC gate drive edges; TO-244AB layout enables symmetric PCB routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IXYS DSSK40-04A | 40 A per leg (vs. 400 A total), TO-247AC package, VF = 0.72 V @ 20 A, TJ max = 175°C | Designed for lower-current, higher-voltage (400 V) SMPS; not scalable to 400 A without paralleling ≥10 units | Select only for space-constrained 20–50 A designs where 175°C rating is critical and paralleling is acceptable. |
| Vishay VS-400EWH04 | 400 A IF(AV), 40 V VRRM, TO-277 package, VF = 0.55 V @ 200 A, RthJC = 0.55 °C/W | Non-isolated SMD package; requires insulated mounting hardware for heatsink attachment; lacks guard ring | Prefer for cost-sensitive, lower-ruggedness applications where baseplate isolation is unnecessary and board-level assembly is prioritized. |
Compared with DSSK40-04A and VS-400EWH04, the 400DMQ045 delivers 10× higher per-device current capacity with superior thermal resistance (0.4 vs. 0.55 °C/W) and built-in isolation - making it uniquely suited for bolt-down, high-reliability industrial welders and UPS systems where layout simplicity and surge immunity are mandatory.
Availability
400DMQ045 is available at Aetrix Electronics and suitable for welding inverters, industrial UPS systems, reverse-battery protection circuits, and high-power motor drives requiring stable component supply across multi-year production cycles.
Supply support for 400DMQ045 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.
The 400DMQ... series was developed for high-efficiency, high-reliability power conversion in harsh-environment applications - specifically targeting welding equipment, uninterruptible power supplies, and battery-protection systems demanding >400 A current handling and 150°C operation.
FAQ
What is the maximum average forward current rating for the 400DMQ045?
The 400DMQ045 is rated for 400 A average forward current (IF(AV)) per device under 50% duty cycle rectangular waveform conditions at case temperature TC = 70°C. This rating applies to the entire module - not per leg - and assumes proper heatsinking per the 0.4°C/W RthJC spec. Exceeding TC = 70°C requires linear derating per Fig. 5 in the datasheet.
Does the 400DMQ045 have electrically isolated terminals?
Yes, the 400DMQ045 uses a TO-244AB isolated doubler package where the baseplate is electrically isolated from all four terminals (A1, K1, A2, K2) with ≥2500 V RMS dielectric strength. This allows direct mounting to grounded heatsinks without insulating pads, simplifying thermal design in high-voltage industrial systems.
What is the forward voltage drop of the 400DMQ045 at elevated temperature?
The 400DMQ045 exhibits a forward voltage drop of 0.52 V per leg at 200 A and junction temperature TJ = 125°C. At TJ = 25°C, VF drops to 0.57 V @ 200 A. The low temperature coefficient of VF ensures stable conduction loss across the full −55°C to +150°C operating range.
Can the 400DMQ045 be used in parallel configurations?
Yes, the 400DMQ045 supports parallel operation of multiple modules to achieve >400 A total current. Its matched VF characteristics and low thermal resistance (0.4°C/W per leg) enable balanced current sharing when mounted on a common heatsink with uniform thermal interface. Current imbalance remains <10% under typical 400 A load conditions.
What is the surge current capability of the 400DMQ045?
The 400DMQ045 supports 29,000 A peak non-repetitive surge current (IFSM) per leg for a 5 µs sine pulse, and 3,400 A for a 10 ms sine pulse. These ratings are validated per JEDEC standards and reflect its suitability for welder short-circuit protection and UPS fault-current clamping without thermal runaway.
400DMQ045 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- TO-244AB
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Series Connection
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 400A
- Voltage - Forward (Vf) (Max) @ If:
- 730 mV @ 400 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 20 mA @ 45 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- TO-244AB
400DMQ045 FAQ
1.How can I place an order for 400DMQ045 through Aetrix?
Please submit a Request for Quotation (RFQ) for 400DMQ045 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 400DMQ045 reliable?
The price and inventory of 400DMQ045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 400DMQ045 is usually 5 days.
3.What payment methods are accepted for 400DMQ045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 400DMQ045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 400DMQ045?
400DMQ045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 400DMQ045 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 400DMQ045?
For technical support, including 400DMQ045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 400DMQ045 requirements.
6.How does Aetrix verify that 400DMQ045 is sourced from the original manufacturer or authorized distributors?
All 400DMQ045 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 400DMQ045 meets industry standards.
7.What is the process for return or replacement of 400DMQ045?
All 400DMQ045 units undergo pre-shipment inspection (PSI). If there is an issue with 400DMQ045, 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 400DMQ045 part is unused and in its original packaging.
Return procedure for 400DMQ045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
400DMQ045 Tags
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Diodes Incorporated
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BAT54C-7-F
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BAV99,215
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BAT54SLT1G
onsemi
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BAV70LT1G
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BAT54CLT1G
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BAT54S-7-F
Diodes Incorporated
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BAV99LT1G
onsemi
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BAT54S,215
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BAS40-04LT1G
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MMBD1503-TP
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