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

Vishay General Semiconductor - Diodes Division FESF8BT-E3/45

Name: FESF8BT-E3/45
Brand: Vishay General Semiconductor - Diodes Division
SKU: FESF8BT-E3/45
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FESF8BT-E3/45

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Diodes

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

Datasheet:: FESF8BT-E3/45.pdf

Description:: DIODE GEN PURP 100V 8A ITO220AC

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Product details

Overview

FESF8BT-E3/45 from Vishay General Semiconductor is an ultrafast plastic rectifier diode in ITO-220AC package, rated for 100 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 FESF8BT-E3/45 datasheet, FESF8BT-E3/45 pinout, FESF8BT-E3/45 application, or FESF8BT-E3/45 equivalent, key selection criteria include its 100 V V_RRM, 35 ns t_rr, 0.95 V forward voltage at 8 A, 125 A surge rating, and ITO-220AC thermal performance with 5.0 °C/W junction-to-case resistance.

Technical Context

This device belongs to Vishay's FES(F,B)8xT family of ultrafast recovery rectifiers optimized for high-frequency switching applications. Its silicon die features glass passivation for reliability, achieves low switching losses via sub-50 ns recovery, and maintains low leakage (<10 µA at 25 °C) across its operating temperature range.

The ITO-220AC package provides electrical isolation (1500 V_AC terminal-to-heatsink), matte tin-plated leads compliant with J-STD-002, and mechanical compatibility with standard TO-220 heatsinks while enabling surface-mount–compatible mounting via through-hole leads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - supports DC bus voltages up to 70 V RMS in SMPS output stages
I_F(AV)	8.0 A at T_C = 100 °C - enables continuous conduction mode operation in 100–200 W converters
t_rr	35 ns - minimizes switching loss and EMI generation in 200–500 kHz topologies
V_F	0.95 V at 8.0 A - reduces conduction loss and improves system efficiency vs. standard fast rectifiers
I_FSM	125 A (8.3 ms half-sine) - withstands startup surges and transient overloads without failure
R_θJC	5.0 °C/W - allows direct heatsink mounting for thermal management in compact industrial power designs
T_J max.	150 °C - supports operation in sealed enclosures or high-ambient environments

Pinout & Package

Package: ITO-220AC - isolated tab package with 1500 V_AC insulation between leads and heatsink mounting surface; lead finish: matte tin per J-STD-002; RoHS-compliant epoxy (UL 94V-0).

Pin/Terminal	Circuit Role	Design Meaning
PIN 1 (Anode)	Input current path during forward conduction	Connected to switching node (e.g., MOSFET drain) in flyback/freewheeling configurations
PIN 2 (Cathode)	Output current path during forward conduction	Connected to output rail or filter capacitor; electrically isolated from heatsink
Tab (K)	Heatsink interface / isolation barrier	Mounts to heatsink but remains electrically isolated at up to 1500 V_AC; no internal connection to pins

Key Features

Feature	Design Value
Glass passivated junction	Enhances long-term reliability under thermal cycling and humid environments without hermetic sealing
Ultrafast 35 ns recovery	Reduces reverse recovery charge (Q_rr) to <15 nC, lowering EMI and gate drive stress in synchronous designs
Low 0.95 V forward drop	Delivers >94 % conduction efficiency at 8 A, reducing thermal load on heatsink by ~1.5 W vs. 1.1 V alternatives
1500 V_AC isolation rating	Enables safe use in Class I insulated AC/DC adapters and medical-grade auxiliary supplies without additional creepage barriers
J-STD-020 MSL Level 1	Allows unlimited floor life and reflow at 245 °C peak - compatible with standard SMT assembly lines

Applications

Server PSU Output Rectification	Industrial DC-DC Converter Freewheeling
Use Scenario: High-density 1U server power supply delivering +12 V @ 60 A using active-clamp forward topology. IC Role / Device Role / Timing Role: Output rectifier handling continuous 8 A average current with 300 kHz switching frequency. Use Value: 35 ns t_rr and 0.95 V V_F reduce total power loss by 2.1 W per diode versus standard fast recovery devices, improving thermal margin.	Use Scenario: 48 V input to 5 V/20 A isolated DC-DC module for PLC backplane power. IC Role / Device Role / Timing Role: Freewheeling diode in secondary-side synchronous rectification circuit with 250 kHz PWM. Use Value: 125 A I_FSM withstands inrush during hot-swap events; 5.0 °C/W R_θJC enables passive heatsinking in confined chassis space.
Telecom Rectifier Module	Renewable Energy Inverter Auxiliary Supply
Use Scenario: -48 V telecom rectifier with redundant 3 kW modules operating at 92 % efficiency. IC Role / Device Role / Timing Role: Primary output rectifier in phase-shifted full-bridge configuration. Use Value: 100 V V_RRM provides 2× safety margin over nominal -48 V bus; glass passivation ensures 15-year field reliability in coastal deployments.	Use Scenario: Auxiliary 24 V supply in solar string inverter, powered from HV DC link via flyback converter. IC Role / Device Role / Timing Role: Flyback secondary rectifier operating at 350 kHz with wide input voltage variation. Use Value: 150 °C T_J max and low IR (<10 µA at 25 °C) maintain regulation stability across -40 to +85 °C ambient range.

Server PSU Output Rectification

Industrial DC-DC Converter Freewheeling

Use Scenario: High-density 1U server power supply delivering +12 V @ 60 A using active-clamp forward topology.

IC Role / Device Role / Timing Role: Output rectifier handling continuous 8 A average current with 300 kHz switching frequency.

Use Value: 35 ns t_rr and 0.95 V V_F reduce total power loss by 2.1 W per diode versus standard fast recovery devices, improving thermal margin.

Use Scenario: 48 V input to 5 V/20 A isolated DC-DC module for PLC backplane power.

IC Role / Device Role / Timing Role: Freewheeling diode in secondary-side synchronous rectification circuit with 250 kHz PWM.

Use Value: 125 A I_FSM withstands inrush during hot-swap events; 5.0 °C/W R_θJC enables passive heatsinking in confined chassis space.

Telecom Rectifier Module

Renewable Energy Inverter Auxiliary Supply

Use Scenario: -48 V telecom rectifier with redundant 3 kW modules operating at 92 % efficiency.

IC Role / Device Role / Timing Role: Primary output rectifier in phase-shifted full-bridge configuration.

Use Value: 100 V V_RRM provides 2× safety margin over nominal -48 V bus; glass passivation ensures 15-year field reliability in coastal deployments.

Use Scenario: Auxiliary 24 V supply in solar string inverter, powered from HV DC link via flyback converter.

IC Role / Device Role / Timing Role: Flyback secondary rectifier operating at 350 kHz with wide input voltage variation.

Use Value: 150 °C T_J max and low IR (<10 µA at 25 °C) maintain regulation stability across -40 to +85 °C ambient range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R06D	600 V V_RRM, 35 ns t_rr, TO-220AC package, R_θJC = 2.2 °C/W, no isolation	Higher voltage rating suits 400 V DC link applications; lacks 1500 V_AC isolation	Select when higher V_RRM is required and heatsink isolation is not needed
IXYS MUR820E	200 V V_RRM, 35 ns t_rr, TO-220AC, R_θJC = 2.0 °C/W, non-isolated	Wider voltage range but no terminal-to-heatsink isolation; higher thermal conductivity	Prefer for non-isolated 200 V systems where maximum thermal performance is critical

Compared with STTH8R06D and IXYS MUR820E, the FESF8BT-E3/45 uniquely combines 100 V rating, 35 ns speed, and 1500 V_AC isolation in ITO-220AC-making it optimal for safety-critical, space-constrained 48–72 V industrial and telecom power supplies requiring reinforced insulation.

Availability

FESF8BT-E3/45 is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, telecom rectifier modules, and renewable energy auxiliary supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for FESF8BT-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 industrial-grade qualification.

The FES(F,B)8xT series was engineered specifically for high-frequency switching power conversion, targeting applications demanding ultrafast recovery, low forward voltage, and robust thermal performance in compact packages.

FAQ

What is the maximum junction temperature rating for the FESF8BT-E3/45?

The FESF8BT-E3/45 has a maximum junction temperature (T_J) of 150 °C, verified per Vishay Document Number 88600. This rating allows reliable operation in enclosed industrial environments and high-ambient applications. Derating curves in the datasheet specify that average forward current must be reduced to 5.2 A at T_C = 125 °C. The FESF8BT-E3/45 maintains stable electrical characteristics up to this limit when mounted on a heatsink per recommended torque (10 in-lbs max).

Does the FESF8BT-E3/45 have electrical isolation between its leads and heatsink tab?

Yes, the FESF8BT-E3/45 uses the ITO-220AC package, which provides 1500 V_AC isolation (1 minute test) between terminals and the heatsink mounting surface. This isolation is confirmed in the Mechanical Data section of Vishay Document 88600. Unlike standard TO-220AC, the ITO variant features internal insulation enabling safe use in Class I power supplies. The FESF8BT-E3/45 tab (K) is not internally connected to either PIN 1 or PIN 2.

What is the reverse recovery time (t_rr) of the FESF8BT-E3/45 and under what test conditions is it measured?

The FESF8BT-E3/45 has a maximum reverse recovery time (t_rr) of 35 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A per Vishay Document 88600. This value applies specifically to the FESF8BT variant within the FES(F,B)8xT family. The FESF8BT-E3/45 achieves this performance due to optimized carrier lifetime control in its ultrafast silicon junction, directly reducing switching loss in high-frequency converters.

Is the FESF8BT-E3/45 RoHS-compliant and qualified for automotive applications?

The FESF8BT-E3/45 is RoHS-compliant per Directive 2011/65/EU and meets JESD201 Class 1A whisker testing, confirming consumer-grade reliability. However, it is not AEC-Q101 qualified - only the HE3-suffix variants (e.g., FESF8BT-HE3/45) carry that qualification. The FESF8BT-E3/45 is intended for industrial, telecom, and computing applications. Its E3 suffix denotes standard reliability grade, not automotive grade.

What is the thermal resistance from junction to case (R_θJC) for the FESF8BT-E3/45?

The FESF8BT-E3/45 has a typical thermal resistance from junction to case (R_θJC) of 5.0 °C/W, as specified in the Thermal Characteristics table of Vishay Document 88600. This value reflects the ITO-220AC package construction and is measured under standard mounting conditions (10 in-lbs torque, flat heatsink surface). The FESF8BT-E3/45 requires proper thermal interface material and heatsink design to maintain T_J ≤ 150 °C at full 8.0 A load.

FESF8BT-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):: 100 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 @ 100 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ITO-220AC

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

FESF8BT-E3/45 FAQ

1.How can I place an order for FESF8BT-E3/45 through Aetrix?

Please submit a Request for Quotation (RFQ) for FESF8BT-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 FESF8BT-E3/45 reliable?

The price and inventory of FESF8BT-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 FESF8BT-E3/45 is usually 5 days.

3.What payment methods are accepted for FESF8BT-E3/45?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FESF8BT-E3/45 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FESF8BT-E3/45?

FESF8BT-E3/45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FESF8BT-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 FESF8BT-E3/45?

For technical support, including FESF8BT-E3/45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FESF8BT-E3/45 requirements.

6.How does Aetrix verify that FESF8BT-E3/45 is sourced from the original manufacturer or authorized distributors?

All FESF8BT-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 FESF8BT-E3/45 meets industry standards.

7.What is the process for return or replacement of FESF8BT-E3/45?

All FESF8BT-E3/45 units undergo pre-shipment inspection (PSI). If there is an issue with FESF8BT-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 FESF8BT-E3/45 part is unused and in its original packaging.

Return procedure for FESF8BT-E3/45:

1.Submit a request within 90 days.

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

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