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Vishay General Semiconductor - Diodes Division FESB8GT-E3/45
- Part No.:
- FESB8GT-E3/45
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
FESB8GT-E3/45.pdf
- Description:
- DIODE GEN PURP 400V 8A TO263AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,967
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Product details
Overview
FESB8GT-E3/45 from Vishay General Semiconductor is an ultrafast plastic rectifier diode in TO-263AB (D²PAK) package, rated for 400 V repetitive peak reverse voltage (VRRM), 8.0 A average forward current (IF(AV)), and 35 ns reverse recovery time (trr). It serves as a high-efficiency freewheeling or output rectifier in switching-mode power supplies operating at 100–500 kHz.
For engineers reviewing the FESB8GT-E3/45 datasheet, FESB8GT-E3/45 pinout, FESB8GT-E3/45 application, or FESB8GT-E3/45 equivalent, key selection criteria include its 35 ns trr, 0.95 V forward voltage at 8 A, 125 A non-repetitive surge rating, 2.2 °C/W junction-to-case thermal resistance, and RoHS-compliant, MSL Level 1 surface-mount construction.
Technical Context
This device belongs to Vishay's FES(F,B)8xT family of ultrafast recovery rectifiers optimized for high-frequency power conversion. Its silicon die features glass passivation for stable leakage performance and is mounted in a low-thermal-resistance TO-263AB thermally enhanced surface-mount package with exposed heatsink tab (Pin 2).
The FESB8GT-E3/45 exhibits a typical junction capacitance of 85 pF at 4.0 V / 1 MHz and maintains <10 µA reverse leakage at 25 °C - critical for minimizing dynamic losses in resonant topologies and synchronous rectification auxiliary paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - supports DC bus voltages up to 280 V RMS in SMPS input rectification or 400 V DC output stages. |
| IF(AV) | 8.0 A at TC = 100 °C - enables continuous conduction mode operation in 100–200 W offline adapters without forced airflow. |
| trr | 35 ns - reduces switching loss and EMI generation in hard-switched flyback and forward converters above 250 kHz. |
| VF | 0.95 V at IF = 8.0 A - lowers conduction loss versus standard fast recovery diodes, improving efficiency by ~0.4% at full load. |
| RθJC | 2.2 °C/W - allows direct PCB copper pour heatsinking to sustain 8 A average current with ≤22 °C temperature rise above case. |
| IFSM | 125 A (8.3 ms half-sine) - withstands inrush and transient overloads in PFC front-end and motor drive snubber circuits. |
Pinout & Package
Package: TO-263AB (D²PAK), surface-mount with isolated heatsink tab (Pin 2). Matte tin-plated leads, RoHS-compliant, MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Input terminal for forward conduction; connects to switching node or transformer secondary in freewheeling configuration. |
| Pin 2 | Cathode / Heatsink Tab | Output terminal and primary thermal path; must be soldered to large copper area for thermal management and electrical isolation from chassis ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable IR <10 µA at 25 °C and <500 µA at 100 °C - critical for standby power compliance in ENERGY STAR designs. |
| Ultrafast 35 ns recovery | Reduces turn-off tail current and associated switching loss by >40% vs. standard FRDs in 300 kHz flyback converters. |
| Low RθJC = 2.2 °C/W | Enables 8 A operation with only 2 in² of 2-oz copper on inner layer - eliminates need for external heatsinks in space-constrained adapters. |
| RoHS-compliant, MSL Level 1 | Supports lead-free reflow assembly at 245 °C peak without delamination or parametric shift - qualified for high-volume SMT lines. |
Applications
| Server PSU Output Rectification | Industrial DC-DC Converter Freewheeling |
|---|---|
|
Use Scenario: Secondary-side synchronous rectification assist in 48 V input, 12 V/20 A isolated DC-DC modules for datacenter power distribution. IC Role / Device Role / Timing Role: Ultrafast freewheeling diode clamping transformer leakage inductor energy during MOSFET off-time. Use Value: 35 ns trr prevents cross-conduction with synchronous MOSFET gate drive, enabling >94% efficiency at 500 kHz switching frequency. |
Use Scenario: Output rectification in 24 V input, 5 V/10 A industrial buck-derived isolated converter powering PLC I/O modules. IC Role / Device Role / Timing Role: High-current unidirectional conduction path during low-side switch off-phase in active clamp forward topology. Use Value: 0.95 V VF minimizes conduction loss across 100% duty cycle loads, reducing thermal stress on PCB copper pours. |
| Telecom AC-DC Adapter | Automotive On-Board Charger Auxiliary Supply |
|
Use Scenario: Input bridge rectification stage in compact 90–264 VAC, 36 W telecom adapter meeting IEC 60950-1 creepage requirements. IC Role / Device Role / Timing Role: Fast-recovery input rectifier handling 50/60 Hz line frequency with minimal stored charge during zero-crossing commutation. Use Value: Low Qrr (derived from 35 ns trr and 0.95 V VF) cuts EMI filter size by 30% compared to 100 ns FRDs. |
Use Scenario: Auxiliary 12 V supply rectification in 400 V battery-fed OBC, operating continuously at ambient up to 105 °C. IC Role / Device Role / Timing Role: High-reliability output rectifier in isolated flyback supplying MCU, gate drivers, and CAN transceivers. Use Value: 150 °C max junction temperature and JESD201 Class 1A whisker-tested terminations ensure 15-year field life under thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R04DJF | TO-263AB, 400 V, 8 A, trr = 30 ns, VF = 0.92 V @ 8 A, RθJC = 2.5 °C/W | Slightly faster recovery but higher thermal resistance; requires larger copper area for same current rating. | Preferred where lowest possible switching loss dominates over thermal layout constraints. |
| ON Semi MUR840CT | TO-220AC, 400 V, 8 A, trr = 35 ns, VF = 0.97 V @ 8 A, RθJC = 2.2 °C/W, through-hole | Identical electrical specs but through-hole mounting; no surface-mount thermal pad; lower MSL rating. | Selected when legacy through-hole assembly or mechanical robustness outweighs SMT density benefits. |
Compared with STTH8R04DJF and MUR840CT, the FESB8GT-E3/45 offers optimal balance of ultrafast recovery, low forward drop, and superior thermal performance in surface-mount form - making it ideal for high-power-density, automated assembly environments where thermal management via PCB copper is prioritized.
Availability
FESB8GT-E3/45 is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, and telecom AC-DC adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for FESB8GT-E3/45 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, thermal performance, and automotive-grade qualification.
The FES(F,B)8xT series was engineered specifically for high-frequency power conversion systems demanding low-loss, fast-recovery rectification in compact, surface-mount packages - targeting next-generation SMPS, EV chargers, and industrial inverters.
FAQ
What is the maximum junction temperature rating for the FESB8GT-E3/45?
The FESB8GT-E3/45 has a maximum junction temperature (TJ) of +150 °C, verified per Vishay Document Number 88600. This rating enables reliable operation in high-ambient environments such as enclosed industrial power supplies or automotive under-hood auxiliary converters. Derating curves confirm sustained 8.0 A average current capability at case temperatures up to 100 °C - essential for thermal design validation of the FESB8GT-E3/45 in real-world layouts.
Does the FESB8GT-E3/45 meet automotive reliability standards?
The FESB8GT-E3/45 carries the "E3" suffix indicating consumer-grade qualification per JESD201 Class 1A whisker testing, but it is not AEC-Q101 qualified. For automotive applications, Vishay offers the HE3-suffix variant (e.g., FESB8GT-HE3/45), which meets AEC-Q101. The FESB8GT-E3/45 remains suitable for non-safety-critical automotive auxiliary supplies where extended temperature operation and robustness are required but formal qualification is not mandated.
What is the reverse recovery time (trr) specification for the FESB8GT-E3/45, and under what test conditions is it measured?
The FESB8GT-E3/45 has a maximum reverse recovery time (trr) of 35 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per Vishay Document Number 88600. This value reflects actual switching behavior in high-frequency converters and directly impacts turn-off loss and EMI generation. Designers should use this trr figure - not typical values - when calculating total switching losses for the FESB8GT-E3/45 in hard-switched topologies.
Can the FESB8GT-E3/45 be used as a direct replacement for the FES8GT-E3/45 in a TO-220AC footprint?
No - the FESB8GT-E3/45 uses a TO-263AB (D²PAK) surface-mount package with Pin 2 as cathode/heatsink tab, while the FES8GT-E3/45 uses a TO-220AC through-hole package with different pin spacing and thermal interface. They share identical electrical ratings (400 V, 8 A, 35 ns), but PCB layout, thermal design, and assembly process differ fundamentally. Substituting the FESB8GT-E3/45 for FES8GT-E3/45 requires full board redesign - the FESB8GT-E3/45 is not a drop-in replacement.
What is the thermal resistance from junction to case (RθJC) for the FESB8GT-E3/45, and how does it impact heatsinking requirements?
The FESB8GT-E3/45 has a typical junction-to-case thermal resistance (RθJC) of 2.2 °C/W, measured from die to the exposed metal tab (Pin 2). This low value enables efficient heat transfer to PCB copper pours - for example, sustaining 8.0 A average current requires only ~22 °C temperature rise across the junction-to-case path. Designers must solder Pin 2 fully to ≥1 in² of 2-oz copper to realize this RθJC; insufficient copper area will degrade thermal performance and limit the usable current of the FESB8GT-E3/45.
FESB8GT-E3/45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263AB (D2PAK)
- Operating Temperature - Junction:
- -55°C ~ 150°C
FESB8GT-E3/45 FAQ
1.How can I place an order for FESB8GT-E3/45 through Aetrix?
Please submit a Request for Quotation (RFQ) for FESB8GT-E3/45 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 FESB8GT-E3/45 reliable?
The price and inventory of FESB8GT-E3/45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FESB8GT-E3/45 is usually 5 days.
3.What payment methods are accepted for FESB8GT-E3/45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FESB8GT-E3/45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FESB8GT-E3/45?
FESB8GT-E3/45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FESB8GT-E3/45 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 FESB8GT-E3/45?
For technical support, including FESB8GT-E3/45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FESB8GT-E3/45 requirements.
6.How does Aetrix verify that FESB8GT-E3/45 is sourced from the original manufacturer or authorized distributors?
All FESB8GT-E3/45 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 FESB8GT-E3/45 meets industry standards.
7.What is the process for return or replacement of FESB8GT-E3/45?
All FESB8GT-E3/45 units undergo pre-shipment inspection (PSI). If there is an issue with FESB8GT-E3/45, 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 FESB8GT-E3/45 part is unused and in its original packaging.
Return procedure for FESB8GT-E3/45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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