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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Vishay General Semiconductor - Diodes Division FESF8DT-E3/45

Name: FESF8DT-E3/45
Brand: Vishay General Semiconductor - Diodes Division
SKU: FESF8DT-E3/45
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FESF8DT-E3/45

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Diodes

Package:: TO-220-2 Full Pack, Isolated Tab

Datasheet:: FESF8DT-E3/45.pdf

Description:: DIODE GEN PURP 200V 8A ITO220AC

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Product details

Overview

FESF8DT-E3/45 from Vishay General Semiconductor is an ultrafast plastic rectifier diode in ITO-220AC package, rated for 200 V repetitive peak reverse voltage (V_RRM), 8.0 A average forward current (I_F(AV)), and 35 ns reverse recovery time (t_rr). It serves as a high-efficiency freewheeling or output rectifier in switching-mode power supplies operating at 100–500 kHz.

For engineers reviewing the FESF8DT-E3/45 datasheet, FESF8DT-E3/45 pinout, FESF8DT-E3/45 application, or FESF8DT-E3/45 equivalent, key selection criteria include its 35 ns t_rr, 0.95 V forward voltage at 8.0 A, 125 A non-repetitive surge rating, 150 °C maximum junction temperature, and ITO-220AC thermal performance with isolated heatsink mounting.

Technical Context

This device employs a glass-passivated silicon junction optimized for ultrafast switching in hard-commutated topologies. Its low Q_rr and 35 ns t_rr minimize turn-off losses in DC-DC converters and PFC stages, while the 2.2 °C/W typical R_θJC enables efficient heat transfer to an external heatsink through the insulated tab.

The ITO-220AC package provides 1500 V isolation between terminals and heatsink, supporting safe operation in grounded-heatsink configurations. With 10 µA max reverse leakage at 25 °C and 500 µA at 100 °C, it maintains stable blocking under elevated thermal stress in industrial power systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - supports 200 V DC bus or 141 V RMS AC input rectification without breakdown
I_F(AV)	8.0 A at T_C = 100 °C - continuous conduction mode output rectification in 100–200 W SMPS
t_rr	35 ns - enables operation up to ~500 kHz with minimal switching loss in hard-switched converters
V_F	0.95 V @ 8.0 A - reduces conduction loss to <1.5 W at full load, improving system efficiency
I_FSM	125 A @ 8.3 ms - withstands inrush and transient overloads in offline power supplies
R_θJC	2.2 °C/W - allows 70 °C temperature rise across junction-to-case with 32 W dissipation
T_J max.	150 °C - supports operation in sealed enclosures or high-ambient industrial environments

Pinout & Package

Package: ITO-220AC - insulated TO-220 variant with electrically isolated metal tab (1500 V isolation), matte tin-plated leads, UL 94V-0 epoxy, and 10 in-lbs max mounting torque.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Input current terminal	Connects to switched node (e.g., MOSFET drain) in flyback/freewheeling configuration
Pin 2 (Cathode)	Output current terminal	Delivers rectified current to output capacitor/load; carries full I_F(AV) and I_FSM
Metal Tab (K)	Isolated heatsink interface	Electrically isolated from pins; mounts directly to chassis/heatsink without insulator washer

Key Features

Feature	Design Value
Glass-passivated junction	Ensures long-term reliability and stable V_F/t_rr under thermal cycling and humidity exposure
Ultrafast 35 ns recovery	Reduces reverse recovery charge (Q_rr) to <25 nC, cutting E_SW in high-frequency converters
1500 V terminal-to-heatsink isolation	Eliminates need for mica washers or silicone pads in grounded-chassis designs
JESD201 Class 1A whisker resistance	Validated for consumer-grade applications with no tin whisker growth risk over 10+ year service life
RoHS-compliant & halogen-free	Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements

Applications

Server PSU Output Rectification	Industrial DC-DC Converter
Use Scenario: Secondary-side synchronous rectification replacement in 1U server PSUs delivering 12 V @ 60 A. IC Role / Device Role / Timing Role: Ultrafast freewheeling diode clamping transformer leakage in forward topology. Use Value: 35 ns t_rr prevents cross-conduction loss during MOSFET dead-time; 0.95 V V_F limits conduction loss to ≤0.75 W per device at 8 A.	Use Scenario: Isolated 48 V to 5 V/20 A DC-DC module for PLC backplanes. IC Role / Device Role / Timing Role: Output rectifier in active-clamp forward converter operating at 300 kHz. Use Value: Low Q_rr minimizes voltage overshoot on clamp capacitor; 125 A I_FSM handles 3× overload during motor startup surges.
Solar Microinverter Bridge	UPS Inverter Freewheeling
Use Scenario: Anti-parallel diode in half-bridge IGBT module for 300–600 V DC string inversion. IC Role / Device Role / Timing Role: Bidirectional conduction path enabling reactive power flow and zero-voltage switching assist. Use Value: 200 V V_RRM matches 600 V IGBT blocking rating with 3× safety margin; 150 °C T_J max supports uncooled outdoor enclosure operation.	Use Scenario: Freewheeling path across inductive loads (e.g., contactor coils, relay drivers) in online UPS control boards. IC Role / Device Role / Timing Role: Clamp inductive kickback during MOSFET turn-off in gate driver circuits. Use Value: 35 ns t_rr ensures fast energy recirculation before next switching cycle; 10 µA IR at 25 °C prevents standby current leakage in battery-backed systems.

Server PSU Output Rectification

Industrial DC-DC Converter

Use Scenario: Secondary-side synchronous rectification replacement in 1U server PSUs delivering 12 V @ 60 A.

IC Role / Device Role / Timing Role: Ultrafast freewheeling diode clamping transformer leakage in forward topology.

Use Value: 35 ns t_rr prevents cross-conduction loss during MOSFET dead-time; 0.95 V V_F limits conduction loss to ≤0.75 W per device at 8 A.

Use Scenario: Isolated 48 V to 5 V/20 A DC-DC module for PLC backplanes.

IC Role / Device Role / Timing Role: Output rectifier in active-clamp forward converter operating at 300 kHz.

Use Value: Low Q_rr minimizes voltage overshoot on clamp capacitor; 125 A I_FSM handles 3× overload during motor startup surges.

Solar Microinverter Bridge

UPS Inverter Freewheeling

Use Scenario: Anti-parallel diode in half-bridge IGBT module for 300–600 V DC string inversion.

IC Role / Device Role / Timing Role: Bidirectional conduction path enabling reactive power flow and zero-voltage switching assist.

Use Value: 200 V V_RRM matches 600 V IGBT blocking rating with 3× safety margin; 150 °C T_J max supports uncooled outdoor enclosure operation.

Use Scenario: Freewheeling path across inductive loads (e.g., contactor coils, relay drivers) in online UPS control boards.

IC Role / Device Role / Timing Role: Clamp inductive kickback during MOSFET turn-off in gate driver circuits.

Use Value: 35 ns t_rr ensures fast energy recirculation before next switching cycle; 10 µA IR at 25 °C prevents standby current leakage in battery-backed systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R06DJF	600 V V_RRM, 35 ns t_rr, TO-220FPAC package (non-isolated tab)	Requires insulating washer for heatsink mounting; higher V_F (1.15 V)	Select when higher voltage margin is needed and isolation is managed externally
IXYS MUR820E	200 V V_RRM, 35 ns t_rr, TO-220AC (non-isolated tab), 100 A I_FSM	No terminal-to-heatsink isolation; lower surge rating than FESF8DT-E3/45	Select when cost sensitivity outweighs isolation requirement and surge margin is sufficient

Compared with STTH8R06DJF and IXYS MUR820E, the FESF8DT-E3/45 uniquely combines 200 V rating, 35 ns speed, and 1500 V isolation in one ITO-220AC package-enabling simplified thermal design and eliminating insulator components in space-constrained industrial power modules.

Availability

FESF8DT-E3/45 is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, solar microinverters, and UPS inverter freewheeling applications requiring stable component supply, RoHS compliance, and verified thermal performance.

Supply support for FESF8DT-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, efficiency, and ruggedness.

The FES(F,B)8xT family was engineered for high-frequency power conversion where low t_rr, stable V_F, and robust surge capability are critical-targeting SMPS, inverters, and industrial motor drives.

FAQ

What is the maximum junction temperature rating for the FESF8DT-E3/45?

The FESF8DT-E3/45 has a maximum junction temperature (T_J) of 150 °C, validated per JEDEC standards. This rating allows reliable operation in enclosed industrial environments where ambient temperatures reach 70–85 °C and heatsink temperatures approach 100 °C. The FESF8DT-E3/45 maintains specified electrical characteristics up to this limit, provided thermal design respects the 2.2 °C/W R_θJC and derating curves in the Vishay datasheet 88600.

Does the FESF8DT-E3/45 require an insulating pad when mounted to a heatsink?

No, the FESF8DT-E3/45 does not require an insulating pad because its ITO-220AC package features a metal tab electrically isolated from both pins, rated for 1500 V AC (1 minute). This isolation eliminates thermal interface complications in grounded-chassis designs. The FESF8DT-E3/45 can be bolted directly to the heatsink with standard mounting hardware, provided torque does not exceed 10 in-lbs to avoid mechanical damage.

What is the forward voltage drop of the FESF8DT-E3/45 at its rated 8.0 A average current?

The FESF8DT-E3/45 exhibits a maximum forward voltage (V_F) of 0.95 V at 8.0 A and T_C = 25 °C, per Vishay datasheet 88600. At elevated case temperatures (e.g., 100 °C), V_F decreases slightly due to negative temperature coefficient. This low V_F directly reduces conduction loss-approximately 0.76 W at 8 A-making the FESF8DT-E3/45 suitable for high-efficiency 12 V and 48 V output rectification stages.

How does the reverse recovery time of the FESF8DT-E3/45 compare to standard fast recovery diodes?

The FESF8DT-E3/45 achieves a reverse recovery time (t_rr) of 35 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions-significantly faster than standard fast recovery diodes (typically 100–500 ns). This ultrafast t_rr minimizes switching loss and EMI generation in high-frequency converters. Unlike standard fast diodes, the FESF8DT-E3/45 uses optimized carrier lifetime control to achieve consistent 35 ns performance across its operating temperature range.

Is the FESF8DT-E3/45 compliant with RoHS and REACH regulations?

Yes, the FESF8DT-E3/45 is fully RoHS-compliant per EU Directive 2011/65/EU and REACH SVHC-free, as confirmed in Vishay's material declarations. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. The "E3" suffix explicitly denotes consumer-grade RoHS compliance, and the device meets JESD201 Class 1A whisker resistance requirements-ensuring long-term reliability in commercial and industrial applications.

FESF8DT-E3/45 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

Package/Case:: TO-220-2 Full Pack, Isolated Tab

Packaging:: Tube

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 8 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ITO-220AC

Operating Temperature - Junction:: -55°C ~ 150°C

FESF8DT-E3/45 FAQ

1.How can I place an order for FESF8DT-E3/45 through Aetrix?

Please submit a Request for Quotation (RFQ) for FESF8DT-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 FESF8DT-E3/45 reliable?

The price and inventory of FESF8DT-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 FESF8DT-E3/45 is usually 5 days.

3.What payment methods are accepted for FESF8DT-E3/45?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FESF8DT-E3/45 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FESF8DT-E3/45?

FESF8DT-E3/45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FESF8DT-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 FESF8DT-E3/45?

For technical support, including FESF8DT-E3/45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FESF8DT-E3/45 requirements.

6.How does Aetrix verify that FESF8DT-E3/45 is sourced from the original manufacturer or authorized distributors?

All FESF8DT-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 FESF8DT-E3/45 meets industry standards.

7.What is the process for return or replacement of FESF8DT-E3/45?

All FESF8DT-E3/45 units undergo pre-shipment inspection (PSI). If there is an issue with FESF8DT-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 FESF8DT-E3/45 part is unused and in its original packaging.

Return procedure for FESF8DT-E3/45:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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