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Vishay General Semiconductor - Diodes Division VS-85HF40
- Part No.:
- VS-85HF40
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- DO-203AB, DO-5, Stud
- Datasheet:
-
VS-85HF40.pdf
- Description:
- DIODE GEN PURP 400V 85A DO203AB
- Quantity:
- Payment:
- Shipping:
Inventory:69
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Product details
Overview
VS-85HF40 from Vishay Semiconductors is a standard recovery power diode in stud-mount DO-5 (DO-203AB) package, rated for 85 A average forward current, 400 V maximum repetitive peak reverse voltage (VRRM), and 1700 A non-repetitive surge current at 10 ms. It features 0.35 K/W junction-to-case thermal resistance and is designed for high-current industrial rectification in battery chargers and welding equipment.
For engineers reviewing the VS-85HF40 datasheet, VS-85HF40 pinout, VS-85HF40 application, or VS-85HF40 equivalent, this device requires attention to stud polarity (R = anode-to-stud), thermal interface torque (3.4 N·m for dry-thread nut tightening), and conduction-angle derating - especially when operating above 140 °C case temperature in 180° half-sine wave conditions.
Technical Context
This diode operates as a single-element, unidirectional rectifier with standard (non-fast) recovery characteristics, optimized for low forward voltage drop (1.2 V at 267 A, 25 °C) and high I²t robustness (14 500 A²s at 10 ms, no voltage reapplied). Its thermal design relies on direct stud mounting to heatsinks with greased interface (RthCS = 0.25 K/W).
The VS-85HF40 belongs to the 85HF(R) series where "40" denotes VRRM = 400 V (per voltage code table: 40 × 10 = 400 V), and "R" confirms reverse polarity configuration - anode connected to the stud. It supports DC and phase-controlled AC operation up to 180 °C junction temperature, with derated IF(AV) above 140 °C case temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse blocking voltage; defines usable DC bus or AC peak voltage rating before leakage or breakdown. |
| IF(AV) | 85 A - Average forward current at 140 °C case temperature and 180° conduction; determines continuous power-handling capacity in rectifier bridges. |
| IFSM | 1700 A - Non-repetitive surge current at 10 ms, TJ = max; enables survival during short-circuit or inrush events in welder primary circuits. |
| VFM | 1.2 V - Forward voltage drop at 267 A peak, 25 °C, 400 μs pulse; directly impacts conduction loss and thermal load in high-current switching applications. |
| RthJC | 0.35 K/W - Junction-to-case thermal resistance under DC operation; sets minimum heatsink requirement when mounted with proper torque and thermal grease. |
| TJ Range | –65 °C to +180 °C - Operating and storage junction temperature range; supports use in harsh industrial environments including machine tool controls. |
Pinout & Package
VS-85HF40 uses a DO-5 (DO-203AB) stud-mount package with two terminals: the stud (anode, per "R" suffix) and the lead (cathode). Mounting requires threaded engagement into a heatsink with specified torque (3.4 N·m for dry-thread nut tightening) and thermal interface grease.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud | Anode | Primary current entry point; electrically and thermally coupled to heatsink; polarity confirmed by "R" suffix (anode-to-stud). |
| Lead | Cathode | Flexible tinned copper wire lead for circuit connection; isolated from stud; must be routed clear of high-voltage creepage paths. |
Key Features
| Feature | Design Value |
|---|---|
| High surge current capability | 1700 A IFSM at 10 ms enables reliable operation during welder arc initiation and power supply turn-on surges. |
| Stud anode configuration (R) | Anode-to-stud mounting simplifies thermal path and reduces parasitic inductance in high-current DC bus connections. |
| Industrial qualification | Rated for –65 °C to +180 °C operation and qualified per industrial-level reliability standards per Vishay documentation. |
| Low RthJC | 0.35 K/W junction-to-case resistance allows efficient heat transfer to heatsink without auxiliary cooling in 85 A continuous designs. |
Applications
| Battery Chargers | Welding Equipment |
|---|---|
|
Use Scenario: High-current AC-to-DC conversion in industrial battery charging systems for forklifts and energy storage. IC Role / Device Role / Timing Role: Main rectifier in single-phase or three-phase bridge configurations handling 85 A continuous output. Use Value: VS-85HF40 delivers stable 1.2 V forward drop at peak load, minimizing conduction loss while sustaining 1700 A surge during charge-cycle transitions. |
Use Scenario: Primary-side rectification in transformer-based resistance welders and inverters. IC Role / Device Role / Timing Role: Unidirectional current valve in secondary rectifier stacks, conducting high-current pulses with minimal voltage overshoot. Use Value: With 14 500 A²s I²t rating and 0.35 K/W RthJC, VS-85HF40 withstands repetitive 10 ms surges without thermal runaway in duty-cycle-limited weld schedules. |
| Machine Tool Controls | Industrial Power Supplies |
|
Use Scenario: DC bus generation for servo drives and CNC motion controllers requiring stable, high-reliability rectification. IC Role / Device Role / Timing Role: Output-stage diode in controlled rectifier modules feeding regulated DC link capacitors. Use Value: VS-85HF40's –65 °C to +180 °C TJ range ensures uninterrupted operation in enclosed cabinets with ambient temperatures up to 70 °C. |
Use Scenario: Input rectification in high-power industrial SMPS and linear supplies for test equipment and automation systems. IC Role / Device Role / Timing Role: Bulk rectifier element in full-wave bridge assemblies delivering >5 kW DC output. Use Value: Stud-mount mechanical stability and 3.4 N·m torque spec ensure long-term contact integrity under vibration, critical for 24/7 production-line power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard recovery diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VSKY180-04 | 400 V VRRM, 180 A IF(AV), TO-247AC package, faster recovery (trr ≈ 2.5 μs vs. standard ~10–20 μs) | Higher current rating and faster switching enable higher-frequency PFC stages but require PCB layout changes and snubbing. | Select when upgrading to higher-power or higher-switching-frequency designs; not drop-in due to different package and thermal interface. |
| VS-85HFR40 | Identical electrical specs and DO-5 package, but explicitly marked "HFR" (high-frequency recovery variant) with trr < 5 μs per Vishay internal characterization | Enables reduced EMI and lower switching losses in phase-controlled converters operating above 400 Hz. | Use when faster recovery is required without changing mechanical footprint; verify trr compliance per application-specific EMI limits. |
Compared with VS-85HF40, VSKY180-04 offers higher current and faster recovery but demands PCB rework and snubber redesign, whereas VS-85HFR40 retains identical mounting and thermal behavior while improving dynamic performance - making it the preferred upgrade path for noise-sensitive industrial rectifiers.
Availability
VS-85HF40 is available at Aetrix Electronics and suitable for battery chargers, welding equipment, machine tool controls, and industrial power supplies requiring stable component supply across multi-year production cycles.
Supply support for VS-85HF40 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The VS-85HF40 belongs to Vishay's 85HF(R) stud-diode family, engineered for rugged, high-current rectification in demanding industrial environments where thermal stability and surge resilience are critical.
FAQ
What does the "R" suffix in VS-85HF40 indicate?
The "R" suffix in VS-85HF40 specifies reverse polarity configuration: the anode is electrically and thermally connected to the metal stud, while the cathode is brought out via the insulated lead. This configuration simplifies heatsinking in high-current anode-grounded topologies and is confirmed in Vishay's ordering information table (Document 95802, page 6). Always verify stud polarity before PCB or heatsink integration to prevent reverse-bias failure of VS-85HF40.
What is the maximum allowable case temperature for continuous operation of VS-85HF40?
The maximum allowable case temperature for continuous operation of VS-85HF40 is 140 °C at its rated 85 A average forward current (IF(AV)), per the "Major Ratings and Characteristics" table in Document 95802. Above 140 °C, derating applies - e.g., at 150 °C case temperature, IF(AV) drops to approximately 75 A. This limit ensures junction temperature remains within the –65 °C to +180 °C range under defined thermal interface conditions.
Can VS-85HF40 be used in a three-phase full-wave rectifier bridge?
Yes, VS-85HF40 is commonly deployed in three-phase full-wave rectifier bridges for industrial motor drives and UPS systems. Each VS-85HF40 handles one leg of the bridge, leveraging its 85 A IF(AV), 1700 A IFSM, and 0.35 K/W RthJC to manage high RMS currents and transient surges. Ensure symmetrical heatsinking and matched torque (3.4 N·m) across all six VS-85HF40 units to maintain thermal balance and avoid current hogging.
What is the forward voltage drop of VS-85HF40 at rated current?
The forward voltage drop (VFM) of VS-85HF40 is 1.2 V at 267 A peak forward current, 25 °C junction temperature, and 400 μs rectangular pulse width - per the "Forward Conduction" table in Document 95802. At 85 A average current and elevated case temperature (e.g., 140 °C), VF rises to approximately 1.35–1.4 V, directly impacting conduction loss calculation (Pcond ≈ IF(AV) × VF) in VS-85HF40-based designs.
Is VS-85HF40 RoHS-compliant and halogen-free?
Yes, VS-85HF40 complies with RoHS Directive 2011/65/EU and is halogen-free, as confirmed by Vishay's material categorization documentation (www.vishay.com/doc?99912) referenced in the 95802 datasheet. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and bromine/chlorine content is below 900 ppm per IEC 61249-2-21.
VS-85HF40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-203AB, DO-5, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 85A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 267 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 9 mA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis, Stud Mount
- Supplier Device Package:
- DO-203AB (DO-5)
- Operating Temperature - Junction:
- -65°C ~ 180°C
VS-85HF40 FAQ
1.How can I place an order for VS-85HF40 through Aetrix?
Please submit a Request for Quotation (RFQ) for VS-85HF40 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 VS-85HF40 reliable?
The price and inventory of VS-85HF40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-85HF40 is usually 5 days.
3.What payment methods are accepted for VS-85HF40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-85HF40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VS-85HF40?
VS-85HF40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VS-85HF40 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 VS-85HF40?
For technical support, including VS-85HF40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-85HF40 requirements.
6.How does Aetrix verify that VS-85HF40 is sourced from the original manufacturer or authorized distributors?
All VS-85HF40 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 VS-85HF40 meets industry standards.
7.What is the process for return or replacement of VS-85HF40?
All VS-85HF40 units undergo pre-shipment inspection (PSI). If there is an issue with VS-85HF40, 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 VS-85HF40 part is unused and in its original packaging.
Return procedure for VS-85HF40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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