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Vishay General Semiconductor - Diodes Division NSB8KT-E3/81
- Part No.:
- NSB8KT-E3/81
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
NSB8KT-E3/81.pdf
- Description:
- DIODE GEN PURP 800V 8A TO263AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,898
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Product details
Overview
NSB8KT-E3/81 from Vishay General Semiconductor is a glass passivated single silicon rectifier diode in D2PAK (TO-263AB) package, rated for 800 V repetitive peak reverse voltage (VRRM), 8.0 A average forward current (IF(AV)) at TC = 100 °C, and 125 A non-repetitive surge current (IFSM). It features low 1.1 V forward voltage drop at 8.0 A and operates up to 150 °C junction temperature, serving as a freewheeling or output rectifier in industrial DC power supplies.
For engineers reviewing the NSB8KT-E3/81 datasheet, NSB8KT-E3/81 pinout, NSB8KT-E3/81 application, or NSB8KT-E3/81 equivalent, key selection criteria include its AEC-Q101 qualification, TO-263AB thermal resistance (RθJC = 3.0 °C/W), 10 μA max reverse leakage at 25 °C, and compatibility with lead-free reflow per J-STD-020 MSL Level 1.
Technical Context
This device is a unidirectional, single-die, planar passivated junction rectifier optimized for high-efficiency AC/DC conversion and inductive load switching. Its 800 V VRRM rating targets mid-voltage industrial inverters and UPS systems where transient overvoltage immunity is critical.
The D2PAK package enables direct heatsink mounting via the exposed cathode tab (Pin 2), delivering 3.0 °C/W typical junction-to-case thermal resistance. The matte tin-plated terminals meet J-STD-002 solderability and JESD 201 Class 1A whisker testing requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Withstands repetitive reverse transients up to 800 V without breakdown, suitable for 400 VAC input rectification with safety margin. |
| IF(AV) | 8.0 A at TC = 100 °C - Sustains continuous 8 A conduction when case temperature is held at 100 °C, requiring active heatsinking in high-power designs. |
| IFSM | 125 A (8.3 ms sine) - Handles short-duration inrush or fault currents common in motor drive freewheeling paths. |
| VF | 1.1 V at 8.0 A, 25 °C - Minimizes conduction loss (8.8 W at full load), improving system efficiency versus higher-VF alternatives. |
| IR | 10 μA at 800 V, 25 °C - Ensures low standby leakage in high-impedance hold-up circuits and precision clamp applications. |
| TJ max. | 150 °C - Enables operation in under-hood automotive modules or enclosed industrial enclosures without derating below ambient 100 °C. |
| RθJC | 3.0 °C/W - Supports thermal design with ≤24 W power dissipation before reaching 150 °C junction limit when mounted to 25 °C heatsink. |
Pinout & Package
NSB8KT-E3/81 uses the D2PAK (TO-263AB) surface-mount package with an exposed metal cathode pad for thermal and electrical connection. The molded compound meets UL 94 V-0 flammability rating and is RoHS-compliant (E3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode terminal | Connected to AC input or inductive load return path; carries full forward current during conduction phase. |
| Pin 2 (Cathode / Tab) | Cathode terminal & thermal path | Exposed copper tab serves as both cathode output and primary heatsink interface; must be soldered to PCB copper pour or external heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling by sealing the silicon die against environmental contamination. |
| AEC-Q101 qualified | Validated for automotive-grade stress testing including temperature cycling, HTRB, and ESD, enabling use in engine control and body electronics. |
| Low VF (1.1 V) | Reduces conduction losses by ~15% compared to standard 1.3 V rectifiers at 8 A, directly lowering thermal load on PCB layout. |
| MSL Level 1 (245 °C peak) | Permits standard lead-free reflow without pre-baking, simplifying manufacturing for high-volume industrial PCB assembly. |
| 150 °C TJ max. | Allows operation in sealed enclosures or near heat-generating components without forced air cooling in many 24/48 V systems. |
Applications
| Industrial DC Power Supply Rectification | Motor Drive Freewheeling Diode |
|---|---|
|
Use Scenario: Output stage of 3-phase 400 VAC-fed industrial SMPS converting to 24–48 VDC for PLC I/O modules. IC Role / Device Role / Timing Role: Main output rectifier conducting continuous 8 A DC current with minimal voltage drop and thermal rise. Use Value: 1.1 V VF reduces conduction loss to 8.8 W, enabling compact heatsink design while maintaining >92% efficiency at full load. |
Use Scenario: Clamp path across DC bus in 7.5 kW variable frequency drive controlling induction motors. IC Role / Device Role / Timing Role: Freewheeling diode providing low-impedance path for inductive kickback during IGBT turn-off. Use Value: 125 A IFSM safely absorbs 60 Hz line-synchronized surge events without degradation, ensuring drive uptime. |
| Uninterruptible Power Supply (UPS) Battery Charging | Automotive On-Board Charger (OBC) Input Stage |
|
Use Scenario: AC/DC front-end rectification in 1 kVA line-interactive UPS with battery backup and AVR circuitry. IC Role / Device Role / Timing Role: Bridge rectifier leg handling 8 A RMS input current with high surge tolerance during brownout recovery. Use Value: 800 V VRRM provides 2× safety margin over 340 V peak line voltage, preventing catastrophic failure during grid transients. |
Use Scenario: PFC boost diode in 3.3 kW OBC for BEV charging from 230 VAC mains. IC Role / Device Role / Timing Role: High-voltage output rectifier in continuous conduction mode (CCM) PFC stage. Use Value: AEC-Q101 qualification and 150 °C TJ max. support under-hood thermal environments while meeting ISO 16750-4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar general-purpose rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R06D | 600 V VRRM, 8 A IF(AV), TO-220AC package, RθJC = 5.0 °C/W | Limited to 300 VAC input systems; higher thermal resistance requires larger heatsink | Select when cost sensitivity outweighs voltage margin and board space allows TO-220AC mounting |
| ON Semi MUR880CT | 800 V VRRM, dual common-cathode configuration, TO-220AB package, VF = 1.75 V | Higher VF increases conduction loss by ~50%; dual-diode topology suits full-wave bridge but adds layout complexity | Choose only if dual-diode integration reduces BOM count and thermal budget permits 14 W loss at 8 A |
Compared with STTH8R06D and MUR880CT, NSB8KT-E3/81 delivers superior voltage margin, lower conduction loss, and better thermal performance in surface-mount layouts-making it optimal for space-constrained, high-reliability 400 VAC-input systems.
Availability
NSB8KT-E3/81 is available at Aetrix Electronics and suitable for industrial DC power supplies, motor drive freewheeling circuits, and automotive on-board charger input stages requiring stable component supply, AEC-Q101 compliance, and RoHS-compliant packaging.
Supply support for NSB8KT-E3/81 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 General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The NSB8xT series targets high-current, high-voltage rectification in industrial and automotive power conversion, designed to replace legacy TO-220 devices with improved thermal performance and surface-mount manufacturability.
FAQ
What is the maximum junction temperature rating for NSB8KT-E3/81?
The NSB8KT-E3/81 has a maximum operating junction temperature (TJ max.) of +150 °C. This rating allows reliable operation in thermally demanding environments such as enclosed industrial power supplies or under-hood automotive modules. Derating curves in the Vishay datasheet (Document Number 88690) specify that average forward current must be reduced linearly above TC = 100 °C to maintain safe junction temperatures. Thermal design must account for RθJC = 3.0 °C/W and PCB copper area.
Is NSB8KT-E3/81 suitable for automotive applications?
Yes, NSB8KT-E3/81 is AEC-Q101 qualified, confirming its suitability for automotive applications including on-board chargers, DC-DC converters, and body control modules. The qualification covers stress tests such as temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge (ESD) per ANSI/ESDA-JEDEC JS-001. Its 150 °C TJ max., RoHS-compliant E3 plating, and MSL Level 1 reflow compatibility further support automotive manufacturing requirements.
What is the forward voltage drop of NSB8KT-E3/81 at rated current?
The NSB8KT-E3/81 exhibits a maximum instantaneous forward voltage (VF) of 1.1 V at 8.0 A and TJ = 25 °C. At elevated junction temperatures (e.g., 125 °C), VF decreases slightly due to semiconductor physics, but system-level thermal design should target worst-case 1.1 V for loss calculation. This low VF directly reduces conduction losses to 8.8 W at full load, improving overall power supply efficiency and easing thermal management.
Does NSB8KT-E3/81 have a specified thermal resistance from junction to case?
Yes, NSB8KT-E3/81 has a typical thermal resistance from junction to case (RθJC) of 3.0 °C/W, measured with the cathode tab (Pin 2) properly mounted to a heatsink or large PCB copper pour. This value assumes optimal thermal interface material and mechanical contact pressure. The D2PAK package's exposed cathode enables efficient heat transfer, making NSB8KT-E3/81 more thermally capable than comparable TO-220AC rectifiers with RθJC = 5.0 °C/W.
What packaging and compliance standards does NSB8KT-E3/81 meet?
NSB8KT-E3/81 uses the D2PAK (TO-263AB) package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker testing. It is RoHS-compliant (E3 suffix), halogen-free, and meets UL 94 V-0 flammability rating. The device is rated MSL Level 1 per J-STD-020, supporting peak reflow temperatures up to 245 °C without preconditioning-enabling seamless integration into standard lead-free SMT lines.
NSB8KT-E3/81 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 8 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 800 V
- Capacitance @ Vr, F:
- 55pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263AB (D2PAK)
- Operating Temperature - Junction:
- -55°C ~ 150°C
NSB8KT-E3/81 FAQ
1.How can I place an order for NSB8KT-E3/81 through Aetrix?
Please submit a Request for Quotation (RFQ) for NSB8KT-E3/81 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 NSB8KT-E3/81 reliable?
The price and inventory of NSB8KT-E3/81 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NSB8KT-E3/81 is usually 5 days.
3.What payment methods are accepted for NSB8KT-E3/81?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NSB8KT-E3/81 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NSB8KT-E3/81?
NSB8KT-E3/81 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NSB8KT-E3/81 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 NSB8KT-E3/81?
For technical support, including NSB8KT-E3/81 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NSB8KT-E3/81 requirements.
6.How does Aetrix verify that NSB8KT-E3/81 is sourced from the original manufacturer or authorized distributors?
All NSB8KT-E3/81 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 NSB8KT-E3/81 meets industry standards.
7.What is the process for return or replacement of NSB8KT-E3/81?
All NSB8KT-E3/81 units undergo pre-shipment inspection (PSI). If there is an issue with NSB8KT-E3/81, 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 NSB8KT-E3/81 part is unused and in its original packaging.
Return procedure for NSB8KT-E3/81:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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