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

Vishay General Semiconductor - Diodes Division VS-25FR120M

Name: VS-25FR120M
Brand: Vishay General Semiconductor - Diodes Division
SKU: VS-25FR120M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VS-25FR120M

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Diodes

Package:: DO-203AA, DO-4, Stud

Datasheet:: VS-25FR120M.pdf

Description:: DIODE GP REV 1.2KV 25A DO203AA

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Product details

Overview

VS-25FR120M from Vishay Semiconductors is a standard recovery power diode in stud-mount DO-4 (DO-203AA) package, rated for 25 A average forward current at 120 °C case temperature, 1200 V maximum repetitive peak reverse voltage (V_RRM), and 373 A non-repetitive surge current at 60 Hz. It features reverse polarity (anode-to-stud) configuration and M5 × 0.8 metric stud thread, designed for high-current industrial rectification in battery chargers and machine tool controls.

For engineers reviewing the VS-25FR120M datasheet, VS-25FR120M pinout, VS-25FR120M application, or VS-25FR120M equivalent, key selection criteria include its 1200 V V_RRM, 25 A I_F(AV), stud-anode thermal interface, R_thJC = 1.5 K/W, and compatibility with forced-air or liquid-cooled heat sinks in high-surge industrial power conversion.

Technical Context

This diode operates as a single-element, unidirectional rectifier with standard (non-fast) recovery characteristics, optimized for line-frequency (50/60 Hz) applications where low conduction loss outweighs switching speed requirements. Its thermal design centers on direct metal-to-heat-sink mounting via the anode stud, enabling efficient junction-to-case heat transfer under sustained DC or half-wave conduction.

The device exhibits dual forward voltage thresholds: 0.80 V at low conduction levels (16.7%–100% π·I_F(AV)) and 0.90 V at higher currents, with corresponding slope resistances of 6.80 mΩ and 5.70 mΩ. Its I²t rating of 580 A²s at 60 Hz supports robust short-circuit withstand capability without fusing.

Key Specifications

Parameter	Value and Actual Design Meaning
I_F(AV)	25 A at T_C = 120 °C - defines continuous DC or half-sine rectified current handling with adequate heatsinking
V_RRM	1200 V - maximum repetitive reverse voltage before breakdown; sets usable AC input voltage range up to ~850 V RMS
I_FSM	373 A at 60 Hz, t = 8.3 ms - surge rating for motor-start or transformer-inrush events without damage
R_thJC	1.5 K/W (DC) - thermal resistance from junction to case; determines required heatsink thermal resistance for safe T_J ≤ 175 °C
V_FM	1.30 V at I_pk = 78 A, T_J = 25 °C - peak forward drop during transient overload, critical for power loss calculation
T_J Range	−65 to +175 °C - operating junction temperature window supporting harsh industrial environments
Stud Thread	M5 × 0.8 - metric mechanical interface for secure, low-thermal-resistance mounting to heatsinks

Pinout & Package

VS-25FR120M uses a two-terminal stud-mount DO-4 (DO-203AA) package with reverse polarity: the anode is connected to the threaded stud, and the cathode is accessible via an insulated terminal (e.g., solder lug or ring tongue). The package provides direct thermal path from junction to heatsink through the anode stud, with no PCB footprint.

Pin/Terminal	Circuit Role	Design Meaning
Anode Stud (M5 × 0.8)	Positive DC output / AC input phase connection	Primary thermal and electrical interface; must be mounted to heatsink with specified torque (1.2 N·m lubricated) and thermal compound
Cathode Terminal	Negative DC output / return path	Insulated mechanical termination point-typically bolted or soldered; electrically isolated from stud and case

Key Features

Feature	Design Value
Reverse polarity stud configuration	Anode-to-stud layout enables direct heatsinking of the higher-power terminal while isolating cathode for flexible circuit routing
High I_FSM surge rating	373 A at 60 Hz allows reliable operation during line transients and inductive load switching without derating
Low R_thJC = 1.5 K/W	Enables compact thermal design: with 2.0 K/W heatsink, max power dissipation ≈ 23 W at ΔT = 35 K (T_J = 175 °C, T_C = 140 °C)
Wide V_RRM range (100–1200 V)	Single platform supports multiple voltage classes; VS-25FR120M specifically targets 3-phase 480 VAC and higher rectification systems
−65 to +175 °C operating range	Validates use in uncontrolled ambient environments such as industrial enclosures, outdoor power cabinets, and motor drive cabinets

Applications

Battery Chargers	Industrial Converters
Use Scenario: Three-phase controlled rectifier stage in high-power EVSE or telecom backup battery chargers. IC Role / Device Role / Timing Role: Main power rectifier converting AC line to regulated DC bus; handles 25 A continuous and 373 A surge during charge initiation. Use Value: 1200 V V_RRM accommodates 480 VAC + 20% tolerance and transient spikes; stud-anode mounting ensures stable thermal performance over 10+ year service life.	Use Scenario: Input rectification in 10–20 kW industrial DC power supplies for CNC machines and welding equipment. IC Role / Device Role / Timing Role: Line-frequency diode bridge leg; conducts half-sine current with 180° conduction angle at full load. Use Value: 25 A I_F(AV) and 1.5 K/W R_thJC allow operation at 120 °C case temperature with passive or low-velocity forced-air cooling.
Machine Tool Controls	DC Motor Drives
Use Scenario: Field supply rectification in large DC motor exciters used in rolling mills and extruders. IC Role / Device Role / Timing Role: Uncontrolled rectifier delivering stable DC excitation current; subjected to frequent start-stop cycles and voltage reversals. Use Value: High I²t (580 A²s) prevents fuse-like failure during repeated inrush events; −65 °C low-temp rating supports cold-climate deployment.	Use Scenario: Regenerative braking energy clamping in 4-quadrant DC drives using external freewheeling paths. IC Role / Device Role / Timing Role: Freewheeling diode across armature winding; conducts reverse-recovery current during commutation. Use Value: Standard recovery behavior minimizes voltage overshoot during slow-switching regen events; 175 °C T_J rating avoids thermal runaway during extended braking duty.

Battery Chargers

Industrial Converters

Use Scenario: Three-phase controlled rectifier stage in high-power EVSE or telecom backup battery chargers.

IC Role / Device Role / Timing Role: Main power rectifier converting AC line to regulated DC bus; handles 25 A continuous and 373 A surge during charge initiation.

Use Value: 1200 V V_RRM accommodates 480 VAC + 20% tolerance and transient spikes; stud-anode mounting ensures stable thermal performance over 10+ year service life.

Use Scenario: Input rectification in 10–20 kW industrial DC power supplies for CNC machines and welding equipment.

IC Role / Device Role / Timing Role: Line-frequency diode bridge leg; conducts half-sine current with 180° conduction angle at full load.

Use Value: 25 A I_F(AV) and 1.5 K/W R_thJC allow operation at 120 °C case temperature with passive or low-velocity forced-air cooling.

Machine Tool Controls

DC Motor Drives

Use Scenario: Field supply rectification in large DC motor exciters used in rolling mills and extruders.

IC Role / Device Role / Timing Role: Uncontrolled rectifier delivering stable DC excitation current; subjected to frequent start-stop cycles and voltage reversals.

Use Value: High I²t (580 A²s) prevents fuse-like failure during repeated inrush events; −65 °C low-temp rating supports cold-climate deployment.

Use Scenario: Regenerative braking energy clamping in 4-quadrant DC drives using external freewheeling paths.

IC Role / Device Role / Timing Role: Freewheeling diode across armature winding; conducts reverse-recovery current during commutation.

Use Value: Standard recovery behavior minimizes voltage overshoot during slow-switching regen events; 175 °C T_J rating avoids thermal runaway during extended braking duty.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IXYS D105N1200	1200 V V_RRM, 105 A I_F(AV), TO-247AC package, 1.0 K/W R_thJC; higher current, lower thermal resistance, but requires PCB mount and isolation hardware	Designed for PCB-based high-density converters; lacks stud interface for direct heatsink mounting	Select when board space is constrained and thermal interface can be engineered with insulating pads and mounting hardware
Vishay VS-25F120M	Identical package, ratings, and construction except normal polarity (cathode-to-stud); same V_RRM, I_F(AV), R_thJC, and surge capability	Requires reversed heatsink polarity and circuit layout; otherwise functionally interchangeable in rectifier bridges where cathode grounding is preferred	Select when system grounding scheme mandates cathode-to-chassis connection or when replacing legacy VS-25F120M designs

Compared with D105N1200 and VS-25F120M, the VS-25FR120M uniquely combines 1200 V/25 A rating with reverse-polarity stud mounting-enabling simplified thermal management in chassis-grounded industrial rectifiers without isolation components or layout rework.

Availability

VS-25FR120M is available at Aetrix Electronics and suitable for battery chargers, industrial converters, machine tool controls, and DC motor drives requiring stable component supply, long-lifecycle support, and consistent mechanical and thermal performance across production batches.

Supply support for VS-25FR120M 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power rectification, MOSFETs, and precision resistors.

The VS-25F(R) Series was developed for ruggedized, high-current industrial rectification-emphasizing thermal reliability, surge robustness, and mechanical durability in stud-mounted configurations for factory automation and heavy-duty power systems.

FAQ

What is the mounting torque specification for the VS-25FR120M stud?

The VS-25FR120M specifies 1.2 N·m (10 lbf·in) mounting torque for lubricated M5 × 0.8 threads, with a ±10% tolerance. This value ensures optimal thermal contact between the anode stud and heatsink without damaging the internal die bond or ceramic insulator. Exceeding this torque risks cracking the DO-4 package seal or deforming the stud, compromising long-term thermal performance and moisture resistance. Always apply thermal compound per Vishay's recommended coverage and verify torque with a calibrated tool during assembly of the VS-25FR120M.

Does the VS-25FR120M have a specified reverse recovery time (t_rr)?

No, the VS-25FR120M is a standard recovery diode and does not specify reverse recovery time (t_rr) in its datasheet. Its design prioritizes low forward voltage and high surge capability over fast switching; typical t_rr for this family exceeds 10 μs at rated conditions. For applications requiring controlled turn-off or high-frequency operation, a fast- or ultrafast-recovery diode (e.g., VS-25E120M) should be selected instead of the VS-25FR120M.

Can the VS-25FR120M be used in parallel with other diodes for higher current capacity?

Parallel operation of VS-25FR120M units is not recommended without individual current-sharing resistors or matched thermal mounting. Due to inherent V_F variation (0.80–0.90 V threshold, 5.7–6.8 mΩ slope), unequal current division occurs-even with identical heatsinking-leading to thermal runaway in one device. If higher current is needed, select a higher-rated part like VS-50FR120M rather than paralleling VS-25FR120M units in the same design.

What is the maximum allowable case temperature for continuous operation of the VS-25FR120M?

The VS-25FR120M is rated for 25 A average forward current at a case temperature (T_C) of 120 °C, as defined in its primary electrical specifications. Operation above 120 °C requires derating per the conduction-angle curves in Figure 1 of the datasheet; at 180° conduction, I_F(AV) drops to ~20 A at T_C = 140 °C. Sustained T_C > 150 °C risks accelerated degradation of the glass passivation and metallization, so thermal design must ensure the VS-25FR120M remains within its 120 °C nominal limit for full-rated current.

Is the VS-25FR120M RoHS-compliant and halogen-free?

Yes, the VS-25FR120M complies with RoHS Directive 2011/65/EU and is halogen-free per Vishay's material categorization standard (document 99912). The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and all bromine/chlorine content is below 900 ppm. Compliance documentation and test reports for the VS-25FR120M are available upon request from Aetrix Electronics or directly from Vishay's quality portal.

VS-25FR120M Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

Package/Case:: DO-203AA, DO-4, Stud

Packaging:: Bulk

Product Status:: Active

Technology:: Standard, Reverse Polarity

Voltage - DC Reverse (Vr) (Max):: 1200 V

Current - Average Rectified (Io):: 25A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 78 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: -

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Chassis, Stud Mount

Supplier Device Package:: DO-203AA (DO-4)

Operating Temperature - Junction:: -65°C ~ 175°C

VS-25FR120M FAQ

1.How can I place an order for VS-25FR120M through Aetrix?

Please submit a Request for Quotation (RFQ) for VS-25FR120M 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-25FR120M reliable?

The price and inventory of VS-25FR120M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-25FR120M is usually 5 days.

3.What payment methods are accepted for VS-25FR120M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-25FR120M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VS-25FR120M?

VS-25FR120M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VS-25FR120M 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-25FR120M?

For technical support, including VS-25FR120M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-25FR120M requirements.

6.How does Aetrix verify that VS-25FR120M is sourced from the original manufacturer or authorized distributors?

All VS-25FR120M 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-25FR120M meets industry standards.

7.What is the process for return or replacement of VS-25FR120M?

All VS-25FR120M units undergo pre-shipment inspection (PSI). If there is an issue with VS-25FR120M, 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-25FR120M part is unused and in its original packaging.

Return procedure for VS-25FR120M:

1.Submit a request within 90 days.

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

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