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

Vishay General Semiconductor - Diodes Division VS-85HFR40

Name: VS-85HFR40
Brand: Vishay General Semiconductor - Diodes Division
SKU: VS-85HFR40
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VS-85HFR40

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Diodes

Package:: DO-203AB, DO-5, Stud

Datasheet:: VS-85HFR40.pdf

Description:: DIODE GEN PURP 400V 85A DO203AB

Quantity:: RFQ Add To RFQ list

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Inventory:76

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Product details

Overview

VS-85HFR40 from Vishay Semiconductors is a stud-mount standard recovery diode with 400 V maximum repetitive peak reverse voltage (V_RRM), rated for 85 A average forward current (I_F(AV)) at 140 °C case temperature, and housed in a DO-5 (DO-203AB) metal stud package. It serves as a high-current rectifier in industrial power conversion systems requiring robust surge handling and thermal stability.

For engineers reviewing the VS-85HFR40 datasheet, VS-85HFR40 pinout, VS-85HFR40 application, or VS-85HFR40 equivalent, this part is evaluated for battery chargers, welding equipment, and machine tool controls where high I_FSM (1700 A @ 10 ms), low R_thJC (0.35 K/W), and stud-mount mechanical reliability are critical selection criteria.

Technical Context

This diode operates as a single-element, unidirectional power rectifier with standard (non-fast) recovery characteristics optimized for line-frequency (50/60 Hz) applications. Its thermal design centers on direct stud-to-heatsink conduction via threaded metal base, enabling high-power dissipation without PCB mounting.

Electrical behavior is defined by a threshold voltage V_F(TO) of 0.68 V and forward slope resistance r_f of 1.62 mΩ (up to 1200 V rating), yielding a forward voltage drop V_FM of 1.2 V at 267 A peak under 25 °C conditions. Junction temperature range spans –65 °C to +180 °C, supporting harsh industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
I_F(AV)	85 A - Sustained DC or half-sine conduction current at 140 °C case temperature
V_RRM	400 V - Maximum repetitive reverse voltage before breakdown; derived from voltage code "40" per ordering table
I_FSM	1700 A - Non-repetitive surge current capability at 10 ms, 50 Hz, no voltage reapplied
R_thJC	0.35 K/W - Low junction-to-case thermal resistance enables efficient heat transfer to heatsink via stud mount
V_F(TO) / r_f	0.68 V / 1.62 mΩ - Forward conduction parameters defining voltage drop profile under load
V_FM	1.2 V - Measured forward voltage at 267 A peak, 25 °C, 400 μs pulse - key for loss calculation in converter designs
T_J Range	–65 °C to +180 °C - Wide operating junction temperature range suitable for industrial and welding applications

Pinout & Package

VS-85HFR40 uses a two-terminal DO-5 (DO-203AB) stud package: anode and cathode are accessed via the threaded metal stud (anode) and insulated lead (cathode), per "R" suffix indicating reverse polarity (anode-to-stud configuration). Mounting torque is 3.4 N·m (30 lbf·in) for non-lubricated thread tightening on nut.

Pin/Terminal	Circuit Role	Design Meaning
Stud (threaded base)	Anode	Primary high-current input terminal; electrically and thermally coupled to heatsink when mounted
Leaded terminal	Cathode	Insulated output terminal; carries full forward current to load return path

Key Features

Feature	Design Value
Stud-anode construction	Enables direct thermal coupling to heatsink and eliminates PCB trace current-carrying requirements
1700 A surge rating (10 ms)	Supports high-inrush operation in welder primary rectification and industrial motor drive front-ends
0.35 K/W thermal resistance	Allows >100 W continuous power dissipation with ≤35 °C temperature rise across junction-to-case interface
–65 °C to +180 °C operating range	Validates use in uncontrolled ambient environments such as factory floors, arc-welding enclosures, and outdoor power systems
DO-5 metal package with 1/4" 28UNF-2A thread	Standardized mechanical interface compatible with off-the-shelf heatsinks and mounting hardware

Applications

Battery Chargers	Welding Equipment
Use Scenario: High-current AC-to-DC conversion in industrial battery charging stations for forklifts and energy storage systems. IC Role / Device Role / Timing Role: Primary rectifier converting 3-phase 400 VAC input to ~540 VDC bus. Use Value: 85 A average current rating and 1700 A surge capacity handle intermittent charge cycles and transformer inrush without derating.	Use Scenario: Input rectification in single-phase or three-phase resistance welding controllers. IC Role / Device Role / Timing Role: Main power diode in thyristor-controlled or transformer-rectifier welder secondary circuits. Use Value: 0.35 K/W R_thJC and 180 °C max T_J sustain repeated short-duration, high-peak-current weld pulses without thermal runaway.
Machine Tool Controls	Industrial Power Supplies
Use Scenario: DC bus generation for servo amplifier power stages in CNC machining centers. IC Role / Device Role / Timing Role: Line-frequency rectifier feeding bulk capacitor banks in regulated DC power supplies. Use Value: Stud-mount mechanical robustness withstands vibration and shock common in machine tool environments (1500 g shock rating).	Use Scenario: Output rectification in high-power industrial SMPS and UPS systems operating at 400 V output level. IC Role / Device Role / Timing Role: Secondary-side rectifier delivering stable DC output under variable load conditions. Use Value: 400 V V_RRM provides sufficient margin over 280–350 VDC nominal outputs, minimizing risk of reverse breakdown during transients.

Battery Chargers

Welding Equipment

Use Scenario: High-current AC-to-DC conversion in industrial battery charging stations for forklifts and energy storage systems.

IC Role / Device Role / Timing Role: Primary rectifier converting 3-phase 400 VAC input to ~540 VDC bus.

Use Value: 85 A average current rating and 1700 A surge capacity handle intermittent charge cycles and transformer inrush without derating.

Use Scenario: Input rectification in single-phase or three-phase resistance welding controllers.

IC Role / Device Role / Timing Role: Main power diode in thyristor-controlled or transformer-rectifier welder secondary circuits.

Use Value: 0.35 K/W R_thJC and 180 °C max T_J sustain repeated short-duration, high-peak-current weld pulses without thermal runaway.

Machine Tool Controls

Industrial Power Supplies

Use Scenario: DC bus generation for servo amplifier power stages in CNC machining centers.

IC Role / Device Role / Timing Role: Line-frequency rectifier feeding bulk capacitor banks in regulated DC power supplies.

Use Value: Stud-mount mechanical robustness withstands vibration and shock common in machine tool environments (1500 g shock rating).

Use Scenario: Output rectification in high-power industrial SMPS and UPS systems operating at 400 V output level.

IC Role / Device Role / Timing Role: Secondary-side rectifier delivering stable DC output under variable load conditions.

Use Value: 400 V V_RRM provides sufficient margin over 280–350 VDC nominal outputs, minimizing risk of reverse breakdown during transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar standard recovery diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
VSKY180-40	Higher I_F(AV) (180 A), same V_RRM (400 V), TO-247AC package with isolated tab	Requires PCB mounting and heatsink isolation; lacks stud mechanical interface	Select when higher current headroom is needed and PCB-based thermal management is preferred
VS-85HF40	Same electrical specs but normal polarity (cathode-to-stud); identical DO-5 package and thermal performance	Mounting orientation differs - cathode grounded to heatsink instead of anode	Choose VS-85HF40 if circuit topology requires cathode-to-heatsink grounding; VS-85HFR40 is required for anode-grounded configurations

Compared with VS-85HF40, VS-85HFR40 offers identical electrical and thermal performance but reversed polarity - critical for ground-referenced anode topologies. Compared with VSKY180-40, it trades higher current rating for superior mechanical ruggedness and direct stud thermal coupling in space-constrained industrial enclosures.

Availability

VS-85HFR40 is available at Aetrix Electronics and suitable for battery chargers, welding equipment, and machine tool controls requiring stable component supply, long-term industrial lifecycle support, and consistent mechanical form factor across production batches.

Supply support for VS-85HFR40 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, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing applications.

The VS-85HFR40 belongs to Vishay's VS-85HF(R) Series of stud-mount standard recovery diodes, engineered specifically for high-current, high-surge industrial rectification where mechanical durability and thermal efficiency outweigh switching speed requirements.

FAQ

What is the V_RRM rating of the VS-85HFR40?

The VS-85HFR40 has a maximum repetitive peak reverse voltage (V_RRM) of 400 V, confirmed by its "40" voltage code in the ordering nomenclature and verified in the Voltage Ratings table of Vishay document 95802. This rating ensures reliable blocking during line-frequency AC rectification up to 400 V RMS input derivatives.

Does the VS-85HFR40 have stud-anode or stud-cathode configuration?

The VS-85HFR40 uses stud-anode configuration, indicated by the "R" suffix meaning reverse polarity (anode-to-stud). The metal stud serves as the anode terminal, while the insulated lead is the cathode - a critical distinction for grounding schemes in high-power rectifier layouts.

What is the maximum allowable case temperature for continuous operation of the VS-85HFR40?

The VS-85HFR40 supports a maximum case temperature (T_C) of 140 °C for its rated 85 A average forward current (I_F(AV)). This value is specified in the Major Ratings table and applies to 180° conduction, half-sine wave conditions per Vishay document 95802.

Can the VS-85HFR40 be used in 60 Hz applications with surge currents?

Yes - the VS-85HFR40 is rated for 1800 A non-repetitive surge current (I_FSM) at 60 Hz (8.3 ms), as documented in the Major Ratings table. Its standardized DO-5 stud package and low R_thJC make it suitable for 60 Hz line rectification in North American industrial equipment.

What is the thermal resistance junction-to-case (R_thJC) for the VS-85HFR40?

The VS-85HFR40 has a maximum thermal resistance of 0.35 K/W from junction to case under DC operation, per the Thermal and Mechanical Specifications table. This value assumes proper mounting with greased, smooth, flat heatsink surface and is essential for calculating junction temperature rise under load.

VS-85HFR40 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

Package/Case:: DO-203AB, DO-5, Stud

Packaging:: Bulk

Product Status:: Active

Technology:: Standard, Reverse Polarity

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 85A

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 267 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 9 mA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Chassis, Stud Mount

Supplier Device Package:: DO-203AB (DO-5)

Operating Temperature - Junction:: -65°C ~ 180°C

VS-85HFR40 FAQ

1.How can I place an order for VS-85HFR40 through Aetrix?

Please submit a Request for Quotation (RFQ) for VS-85HFR40 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-85HFR40 reliable?

The price and inventory of VS-85HFR40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-85HFR40 is usually 5 days.

3.What payment methods are accepted for VS-85HFR40?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-85HFR40 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VS-85HFR40?

VS-85HFR40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VS-85HFR40 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-85HFR40?

For technical support, including VS-85HFR40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-85HFR40 requirements.

6.How does Aetrix verify that VS-85HFR40 is sourced from the original manufacturer or authorized distributors?

All VS-85HFR40 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-85HFR40 meets industry standards.

7.What is the process for return or replacement of VS-85HFR40?

All VS-85HFR40 units undergo pre-shipment inspection (PSI). If there is an issue with VS-85HFR40, 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-85HFR40 part is unused and in its original packaging.

Return procedure for VS-85HFR40:

1.Submit a request within 90 days.

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

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