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Vishay General Semiconductor - Diodes Division VS-40HF120
- Part No.:
- VS-40HF120
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- DO-203AB, DO-5, Stud
- Datasheet:
-
VS-40HF120.pdf
- Description:
- DIODE GEN PURP 1.2KV 40A DO203AB
- Quantity:
- Payment:
- Shipping:
Inventory:40
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Product details
Overview
VS-40HF120 from Vishay Semiconductors is a standard recovery power diode in stud-mount DO-5 (DO-203AB) package, rated for 40 A average forward current, 1200 V maximum repetitive peak reverse voltage (VRRM), and 570 A non-repetitive surge current at 50 Hz. It serves as a main rectifier in high-current industrial AC/DC conversion stages, such as welding power supplies and battery chargers.
For engineers reviewing the VS-40HF120 datasheet, VS-40HF120 pinout, VS-40HF120 application, or VS-40HF120 equivalent, key selection criteria include thermal resistance (RthJC = 0.95 K/W), forward voltage drop (VFM = 1.30 V @ 125 A, 25 °C), junction temperature range (–65 to +190 °C), and stud-mount mechanical interface compatibility with threaded heatsinks.
Technical Context
This device operates as a single-element, unidirectional power rectifier with standard (non-fast) recovery characteristics, optimized for line-frequency (50/60 Hz) applications where low conduction loss and high surge robustness outweigh switching speed requirements. Its thermal design centers on direct metal-to-heatsink mounting via a 1/4" 28UNF-2A stud cathode.
The VS-40HF120 exhibits a forward threshold voltage VF(TO) of 0.65 V and slope resistance rf of 4.29 mΩ at maximum junction temperature, enabling predictable forward power loss modeling up to 190 °C junction. Its I²t rating of 1600 A²s (10 ms, no voltage reapplied) supports reliable fuse coordination in high-energy fault scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1200 V - blocks up to 1200 V reverse voltage without breakdown; suitable for 800 V DC bus systems with 50 % safety margin |
| IF(AV) | 40 A - average forward current at 140 °C case temperature with 180° half-sine conduction; defines continuous power handling |
| IFSM (50 Hz) | 570 A - withstands short-duration line-frequency surges (e.g., transformer inrush, welder arc initiation) |
| RthJC | 0.95 K/W - thermal resistance from junction to case; enables accurate junction temperature estimation under load |
| VFM | 1.30 V @ 125 A, 25 °C - measured forward drop under pulsed high-current condition; used for transient loss calculation |
| TJ Range | –65 to +190 °C - wide operating range supports harsh environments including industrial welding and machine tool enclosures |
Pinout & Package
VS-40HF120 uses a two-terminal stud-mount DO-5 (DO-203AB) package with cathode connected to the threaded stud body and anode accessible via an insulated lead. Mounting requires torque control (3.4 N·m, non-lubricated nut) to ensure consistent thermal contact and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Body) | Cathode | Primary heat path to heatsink; electrically and thermally coupled to cathode semiconductor region |
| Lead (Insulated) | Anode | Isolated electrical connection for anode; designed for pass-through PCB or terminal block mounting |
Key Features
| Feature | Design Value |
|---|---|
| High surge current capability | 570 A IFSM (50 Hz) enables robust operation during welder startup and converter input inrush events |
| Stud cathode construction | Direct metal-to-heatsink thermal interface achieves 0.95 K/W RthJC, minimizing junction temperature rise |
| Wide junction temperature range | –65 to +190 °C operation supports deployment in uncooled industrial enclosures and high-ambient environments |
| Standard recovery profile | Optimized for 50/60 Hz line-frequency rectification-lower cost and higher surge tolerance than fast recovery types |
Applications
| Battery Chargers | Welding Power Supplies |
|---|---|
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 converting three-phase 400 V AC to ~540 V DC bus. Use Value: 40 A IF(AV) and 1200 V VRRM provide sufficient margin for 400 V AC input with transients; stud mount ensures stable thermal performance over extended charge cycles. | Use Scenario: Primary rectification stage in constant-current DC welding inverters and thyristor-based welders. IC Role / Device Role / Timing Role: Line-frequency output rectifier delivering up to 40 A DC to welding electrode circuit. Use Value: 570 A IFSM handles repeated arc ignition surges; 190 °C TJ max allows operation near enclosure walls without forced cooling. |
| Machine Tool Controls | Industrial Power Supplies |
Use Scenario: DC excitation and control power generation in CNC motor drives and hydraulic valve controllers. IC Role / Device Role / Timing Role: Uncontrolled rectifier feeding regulated 24 V or 48 V auxiliary supply rails. Use Value: DO-5 stud package enables secure mounting on control cabinet heatsinks; –65 °C low-temp rating supports outdoor or refrigerated facility use. | Use Scenario: Bulk rectification in DIN-rail mounted 3 kW industrial PSUs for factory automation. IC Role / Device Role / Timing Role: Single-phase or three-phase bridge leg component in high-reliability linear or hybrid topologies. Use Value: 1600 A²s I²t rating simplifies downstream fuse selection; RthCS of 0.25 K/W (greased surface) ensures predictable thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard recovery diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VSKY40120 | Same 40 A / 1200 V rating, but TO-247AC package with isolated tab; RthJC = 1.2 K/W | Requires insulating hardware and PCB footprint; less efficient thermal coupling than stud mount | Select when PCB assembly and isolation are prioritized over thermal performance |
| IXYS DSEI30-12A | 30 A / 1200 V fast recovery diode; trr = 35 ns vs. standard recovery (~2–5 µs); TO-247AD package | Higher switching loss at line frequency but enables higher-frequency PFC stages | Select only if system requires faster recovery for hybrid topologies or EMI reduction |
Compared with VSKY40120 and IXYS DSEI30-12A, the VS-40HF120 delivers superior thermal performance (0.95 K/W) and higher surge rating (570 A) in a mechanically robust stud-mount form factor ideal for bolted heatsink integration in high-power industrial rectifiers.
Availability
VS-40HF120 is available at Aetrix Electronics and suitable for battery chargers, welding power supplies, and industrial power supplies requiring stable component supply across multi-year production programs.
Supply support for VS-40HF120 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability and power-handling capability.
The VS-40HF120 belongs to Vishay's VS-40HF(R) Series of standard recovery stud diodes, engineered for rugged line-frequency rectification in high-current industrial equipment where thermal stability and surge resilience are critical.
FAQ
What is the maximum junction temperature rating for VS-40HF120?
The VS-40HF120 has a maximum junction operating temperature of +190 °C, confirmed in the Vishay datasheet Document Number 93513. This rating applies to the 100–1200 V variants (including VS-40HF120) and enables operation in high-ambient industrial environments without active cooling. The device must be mounted per specified torque (3.4 N·m) to maintain thermal integrity at this limit.
Does VS-40HF120 have a stud-anode or stud-cathode configuration?
The VS-40HF120 uses a stud-cathode configuration: the metal stud body is electrically connected to the cathode, while the anode is brought out via an insulated lead. This is indicated by the absence of "R" in the part number suffix (VS-40HF120, not VS-40HFR120). The datasheet confirms "None = stud normal polarity (cathode to stud)" in the ordering information table.
What is the forward voltage drop specification for VS-40HF120 at rated current?
The VS-40HF120 specifies a maximum forward voltage drop (VFM) of 1.30 V at 125 A instantaneous current, 25 °C junction temperature, and 400 µs pulse width. This value reflects conduction loss under transient high-current conditions-not steady-state-so designers should use VF(TO) = 0.65 V and rf = 4.29 mΩ for DC or RMS loss modeling.
Can VS-40HF120 be used in three-phase bridge rectifiers?
Yes, VS-40HF120 is commonly deployed in three-phase full-wave bridge rectifiers for industrial power conversion. Its 40 A average forward current rating, 1200 V VRRM, and 570 A surge capability meet typical requirements for 400 V AC input systems. Thermal design must account for RthJC = 0.95 K/W and ensure adequate heatsink contact area and mounting torque.
What is the thermal resistance from junction to case (RthJC) for VS-40HF120?
The junction-to-case thermal resistance (RthJC) for VS-40HF120 is 0.95 K/W under DC operation, as specified in the Vishay datasheet Document Number 93513. This value assumes proper mounting on a smooth, flat, greased heatsink surface with correct torque (3.4 N·m). Conduction angle affects effective RthJC-e.g., it increases by 0.14 K/W at 180° sinusoidal conduction.
VS-40HF120 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):
- 1200 V
- Current - Average Rectified (Io):
- 40A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 125 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 9 mA @ 1200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis, Stud Mount
- Supplier Device Package:
- DO-203AB (DO-5)
- Operating Temperature - Junction:
- -65°C ~ 190°C
VS-40HF120 FAQ
1.How can I place an order for VS-40HF120 through Aetrix?
Please submit a Request for Quotation (RFQ) for VS-40HF120 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-40HF120 reliable?
The price and inventory of VS-40HF120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-40HF120 is usually 5 days.
3.What payment methods are accepted for VS-40HF120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-40HF120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VS-40HF120?
VS-40HF120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VS-40HF120 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-40HF120?
For technical support, including VS-40HF120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-40HF120 requirements.
6.How does Aetrix verify that VS-40HF120 is sourced from the original manufacturer or authorized distributors?
All VS-40HF120 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-40HF120 meets industry standards.
7.What is the process for return or replacement of VS-40HF120?
All VS-40HF120 units undergo pre-shipment inspection (PSI). If there is an issue with VS-40HF120, 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-40HF120 part is unused and in its original packaging.
Return procedure for VS-40HF120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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