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Vishay General Semiconductor - Diodes Division VS-VSKD91/08
- Part No.:
- VS-VSKD91/08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Diode Arrays
- Package:
- ADD-A-PAK (3)
- Datasheet:
-
VS-VSKD91/08.pdf
- Description:
- DIODE MODULE GP 800V 50A ADDAPAK
- Quantity:
- Payment:
- Shipping:
Inventory:7,041
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Product details
Overview
VS-VSKD91/08 from Vishay Semiconductors is a high-voltage, 100 A average current, dual-diode doubler configuration power module in AAP Gen 7 (TO-240AA) package, rated for 800 V repetitive peak reverse voltage (VRRM) and optimized for industrial UPS, regulated HV power supplies, and motor speed control circuits.
For engineers reviewing the VS-VSKD91/08 datasheet, VS-VSKD91/08 pinout, VS-VSKD91/08 application, or VS-VSKD91/08 equivalent, this module delivers verified thermal resistance (RthJC = 0.22 °C/W per leg), low forward voltage drop (VFM = 1.55 V at 25 °C), and surge robustness (IFSM = 2020 A @ 10 ms, 50 Hz) critical for high-reliability power conversion designs.
Technical Context
This module implements a two-diode doubler circuit - both diodes share a common terminal structure with independent anode and cathode terminals - enabling efficient voltage doubling in single-phase rectification topologies without external series/parallel wiring. Its exposed direct-bonded copper substrate ensures low thermal resistance and stable junction temperature up to +150 °C under full load.
The VS-VSKD91/08 operates with sinusoidal half-wave conduction at 180°, supports RMS forward current of 157 A, and maintains I2t fusing capability of 20.41 kA²s (10 ms, no voltage reapplied), making it suitable for applications requiring high transient energy handling and predictable fuse coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - maximum repetitive reverse blocking voltage; defines safe operating range in HV rectifier and snubber circuits |
| IF(AV) | 100 A - average forward current at TC = 112 °C; sets continuous DC output capability in power supplies |
| RthJC | 0.22 °C/W per leg - junction-to-case thermal resistance; enables precise heatsink sizing for 150 °C max TJ |
| VFM | 1.55 V @ π × IF(AV), 25 °C - forward voltage at full pulse current; directly impacts conduction loss and thermal design |
| IFSM | 2020 A @ 10 ms, 50 Hz - non-repetitive surge rating; determines short-circuit withstand capability in line-commutated systems |
| IRRM | 10 mA @ TJ = 150 °C - peak reverse leakage; critical for voltage hold-off stability in high-temperature industrial environments |
| VINS | 3000 V RMS @ 50 Hz, 1 min - insulation withstand voltage; certifies safety isolation between terminals and baseplate |
Pinout & Package
AAP Gen 7 (TO-240AA) is a 3-terminal, insulated metal-base power module with screw-mounting interface (M5 × 0.8), 92 mm × 30 mm footprint, and 75 g mass. The case provides galvanic isolation and direct thermal path to heatsink via greased mounting surface (RthCS = 0.1 °C/W typical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| (1) | Anode of Diode 1 | Primary input terminal for first diode in doubler configuration; connects to AC input phase |
| (2) | Cathode of Diode 1 / Anode of Diode 2 | Internal common node - forms mid-point connection essential for voltage-doubling operation |
| (3) | Cathode of Diode 2 | Output terminal for doubled DC voltage; carries full IF(AV) current to load or filter capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Exposed DBC substrate | Enables RthJC = 0.22 °C/W per leg - reduces thermal derating and extends lifetime in sealed enclosures |
| Doubler circuit topology | Eliminates need for external series diodes in voltage-doubling rectifiers - saves PCB space and interconnect losses |
| UL recognition E78996 | Validates safety compliance for industrial equipment - accelerates regulatory approval for end products |
| High surge IFSM | 2020 A (10 ms, 50 Hz) - sustains line transients and inrush without degradation - critical for UPS and battery charger inputs |
| 1600 V VRRM scalability | Same package supports up to 1600 V variants - allows design reuse across 400–1600 V systems with identical mechanical layout |
Applications
| Uninterruptible Power Supply (UPS) | Industrial HV Regulated Power Supply |
|---|---|
Use Scenario: AC-to-DC front-end rectification with voltage doubling to achieve ±800 V DC bus from 230 VAC input. IC Role / Device Role / Timing Role: Dual-diode doubler module providing full-wave rectified, doubled DC output without transformer center-tap or extra diodes. Use Value: Reduces component count by 2× vs discrete diode solution while maintaining 100 A average output and 2020 A surge tolerance. |
Use Scenario: High-efficiency, high-reliability DC power generation for plasma generators and industrial lasers. IC Role / Device Role / Timing Role: Primary rectifying element in controlled HV DC supply, operating continuously at 112 °C case temperature. Use Value: Direct thermal path and 0.22 °C/W RthJC enable stable 150 °C junction operation without forced air cooling. |
| Motor Speed Control Circuit | Lighting Circuit (HV LED Driver) |
Use Scenario: Phase-controlled rectification in thyristor-based AC motor drives feeding 400–800 V DC link. IC Role / Device Role / Timing Role: High-current, high-voltage freewheeling and commutation path during SCR conduction intervals. Use Value: 10 mA IRRM at 150 °C ensures minimal leakage-induced voltage drift during zero-crossing detection. |
Use Scenario: Constant-current HV rectification stage powering multi-string 1000 V LED arrays in street lighting. IC Role / Device Role / Timing Role: Mainline rectifier delivering ripple-free DC after smoothing, operating at 100 % duty cycle. Use Value: 1.55 V VFM at 25 °C and low rf1 = 2.4 mΩ minimize conduction loss and thermal stress on downstream MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage diode module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VS-VSKC91/08 | Common-cathode dual-diode configuration (vs. doubler); separate cathodes, shared anode | Suitable for parallel-connected rectifier legs or dual-output supplies - not usable in voltage-doubling topology | Select VS-VSKC91/08 only when independent cathode routing or symmetrical dual-output is required |
| IXYS MDA95-16N1 | 1600 V VRRM, same 100 A IF(AV), TO-240AA-compatible but higher VF (1.85 V) and RthJC (0.25 °C/W) | Better suited for ultra-HV applications (>1200 V); less thermally efficient at 800 V due to higher conduction loss | Choose MDA95-16N1 only if system requires >1200 V blocking; otherwise VS-VSKD91/08 offers superior thermal and conduction performance at 800 V |
Compared with VS-VSKC91/08 and IXYS MDA95-16N1, the VS-VSKD91/08 uniquely supports voltage-doubling rectification in a single package while offering the lowest thermal resistance and forward voltage among 800 V-rated modules in TO-240AA, optimizing efficiency and heatsink size in space-constrained industrial power systems.
Availability
VS-VSKD91/08 is available at Aetrix Electronics and suitable for uninterruptible power supplies, industrial HV regulated power supplies, and motor speed control circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for VS-VSKD91/08 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 and passive components, specializing in high-reliability power devices for industrial, automotive, and computing applications.
The VS-VSKD91/08 belongs to Vishay's ADD-A-PAK Generation VII diode module family, engineered specifically for high-voltage, high-current industrial rectification where thermal performance, surge robustness, and UL-certified safety are mandatory.
FAQ
What is the circuit configuration of VS-VSKD91/08?
The VS-VSKD91/08 implements a two-diode doubler circuit: Terminal (1) is the anode of Diode 1, Terminal (2) is the shared cathode/anode node, and Terminal (3) is the cathode of Diode 2. This configuration enables voltage doubling in single-phase AC inputs without external diodes or transformers, and is confirmed in Vishay Document 94627, page 7.
What is the maximum junction temperature and thermal resistance of VS-VSKD91/08?
The VS-VSKD91/08 has a maximum junction temperature (TJ) of +150 °C and a junction-to-case thermal resistance (RthJC) of 0.22 °C/W per leg under DC operation. These values are specified in the Thermal and Mechanical Specifications table (Document 94627, page 3) and define the thermal boundary for heatsink design and derating calculations.
Does VS-VSKD91/08 have UL certification?
Yes, the VS-VSKD91/08 is UL recognized under file E78996, as stated in the FEATURES section of Vishay Document 94627 (page 1). This certification confirms compliance with UL 1557 for reinforced insulation and validates its use in industrial equipment requiring safety agency approval.
What is the forward voltage drop of VS-VSKD91/08 at rated current?
The VS-VSKD91/08 exhibits a maximum forward voltage drop (VFM) of 1.55 V at IFM = π × IF(AV) = 314 A, TJ = 25 °C, and 400 μs square wave pulse. This value is measured per the Forward Conduction table (Document 94627, page 2) and directly determines conduction loss in high-current applications.
Can VS-VSKD91/08 be mounted directly to a heatsink?
Yes, the VS-VSKD91/08 is designed for direct mounting to a heatsink using M5 × 0.8 screws at 4 Nm torque. Its insulated metal baseplate and recommended thermal compound yield a typical case-to-heatsink resistance (RthCS) of 0.1 °C/W, as specified in the Thermal and Mechanical Specifications (Document 94627, page 3).
VS-VSKD91/08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- ADD-A-PAK (3)
- Packaging:
- Bulk
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io) (per Diode):
- 50A
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 mA @ 800 V
- Operating Temperature - Junction:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- ADD-A-PAK®
VS-VSKD91/08 FAQ
1.How can I place an order for VS-VSKD91/08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VS-VSKD91/08 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-VSKD91/08 reliable?
The price and inventory of VS-VSKD91/08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-VSKD91/08 is usually 5 days.
3.What payment methods are accepted for VS-VSKD91/08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-VSKD91/08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VS-VSKD91/08?
VS-VSKD91/08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VS-VSKD91/08 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-VSKD91/08?
For technical support, including VS-VSKD91/08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-VSKD91/08 requirements.
6.How does Aetrix verify that VS-VSKD91/08 is sourced from the original manufacturer or authorized distributors?
All VS-VSKD91/08 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-VSKD91/08 meets industry standards.
7.What is the process for return or replacement of VS-VSKD91/08?
All VS-VSKD91/08 units undergo pre-shipment inspection (PSI). If there is an issue with VS-VSKD91/08, 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-VSKD91/08 part is unused and in its original packaging.
Return procedure for VS-VSKD91/08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VS-VSKD91/08 Tags
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