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Vishay General Semiconductor - Diodes Division VS-25FR120
- Part No.:
- VS-25FR120
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
VS-25FR120.pdf
- Description:
- DIODE GEN PURP 1.2KV 25A DO203AA
- Quantity:
- Payment:
- Shipping:
Inventory:75
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Product details
Overview
VS-25FR120 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 (VRRM), and 373 A non-repetitive surge current at 60 Hz. It serves as a main rectifier in high-current industrial power conversion stages.
For engineers reviewing the VS-25FR120 datasheet, VS-25FR120 pinout, VS-25FR120 application, or VS-25FR120 equivalent, key selection criteria include thermal resistance (RthJC = 1.5 K/W), forward voltage drop (VFM = 1.30 V at 78 A), surge capability (IFSM = 373 A), and stud-anode polarity configuration for heatsink-integrated mounting.
Technical Context
The VS-25FR120 is a single-diode, stud-anode (R-suffix) standard recovery device optimized for line-frequency rectification where soft recovery and low switching loss are not required. Its thermal design centers on direct metal-to-heatsink conduction via threaded stud anode and insulated cathode base.
It operates across -65 °C to +175 °C junction temperature range with defined I²t fusing limits (580 A²s at 60 Hz) and forward slope resistances (rf2 = 5.70 mΩ above π×IF(AV)), supporting predictable thermal modeling in battery chargers and machine tool controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 25 A average forward current at TC = 120 °C - defines continuous DC or half-wave conduction rating |
| VRRM | 1200 V - maximum repetitive reverse blocking voltage; sets minimum insulation and snubber requirements |
| IFSM (60 Hz) | 373 A - surge withstand for one AC cycle; determines fuse coordination and inrush robustness |
| RthJC | 1.5 K/W - junction-to-case thermal resistance under DC operation; enables heatsink sizing with known ΔT |
| VFM | 1.30 V at Ipk = 78 A, TJ = 25 °C, tp = 400 μs - peak forward drop during transient overload |
| rf2 | 5.70 mΩ - high-current forward slope resistance; used to calculate conduction loss above π×IF(AV) |
| TJ Range | -65 to +175 °C - qualified operating junction temperature span for industrial ambient extremes |
Pinout & Package
VS-25FR120 uses the DO-4 (DO-203AA) stud-mount package with reverse polarity: anode connected to the threaded M5 × 0.8 stud, cathode isolated on the base flange. Mounting torque is 1.2 N·m (10 lbf·in) for lubricated threads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Stud) | Positive input terminal | Threaded M5 × 0.8 metal stud - electrically and thermally coupled to heatsink; requires insulating washer if cathode-side mounting |
| Cathode (Base) | Negative output terminal | Isolated copper base flange - connects to PCB or busbar; provides primary mechanical anchoring and thermal path to ambient via case |
Key Features
| Feature | Design Value |
|---|---|
| Stud-anode reverse polarity | Enables direct anode connection to grounded heatsink without isolation hardware in common-cathode rectifier topologies |
| High IFSM (373 A @ 60 Hz) | Supports reliable startup into highly capacitive or short-circuited loads without fuse nuisance tripping |
| Low RthJC (1.5 K/W) | Allows compact heatsink design for 25 A continuous operation with ≤37.5 K temperature rise at full load |
| Wide VRRM range up to 1200 V | Permits use in 3-phase 690 VAC systems with 2× safety margin, meeting IEC 61800-5-1 insulation requirements |
Applications
| Battery Chargers | Industrial Power Supplies |
|---|---|
Use Scenario: Three-phase rectification stage in 48 V / 100 A telecom battery charger with active cooling. IC Role / Device Role / Timing Role: Main AC/DC power conversion diode handling full line current with minimal conduction loss. Use Value: 25 A IF(AV) and 373 A IFSM ensure stable operation during repeated charge-cycle surges and cold-start inrush. | Use Scenario: Input rectifier in DIN-rail mounted 24 V / 20 A industrial PLC power supply. IC Role / Device Role / Timing Role: High-reliability line-frequency rectifier mounted directly to chassis heatsink. Use Value: Stud-anode configuration simplifies thermal management and eliminates need for isolating hardware in grounded-chassis designs. |
| Machine Tool Controls | DC Motor Drives |
Use Scenario: Field excitation supply rectifier in CNC servo amplifier with regenerative braking. IC Role / Device Role / Timing Role: Unidirectional energy transfer element in controlled DC link feeding field windings. Use Value: 1200 V VRRM accommodates voltage spikes from inductive kickback during rapid deceleration. | Use Scenario: Full-wave bridge rectifier in 15 kW DC motor drive for conveyor systems. IC Role / Device Role / Timing Role: Primary power conversion component converting 400 VAC three-phase input to DC bus. Use Value: Low RthJC (1.5 K/W) and high I²t rating (580 A²s) sustain repeated duty cycles without thermal runaway. |
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 DSEI2x31-12A | Dual diode in SOT-227B; 31 A IF(AV); lower VFM (1.15 V); higher cost | Requires dual-diode topology; better suited for parallel bridge legs | Select when dual-device integration reduces board area and matching is critical |
| STMicroelectronics STTH3012D | TO-247AC package; 30 A IF(AV); 1200 V VRRM; faster recovery (trr = 125 ns) | Standard recovery but with faster switching; unsuitable for pure line-frequency use due to higher EMI | Select when mixed-frequency operation or reduced snubber size is needed |
Compared with DSEI2x31-12A and STTH3012D, the VS-25FR120 offers lower-cost, stud-mount thermal integration ideal for fixed-frequency industrial rectifiers where layout simplicity and mechanical robustness outweigh fast-switching needs.
Availability
VS-25FR120 is available at Aetrix Electronics and suitable for battery chargers, industrial power supplies, machine tool controls, and DC motor drives requiring stable component supply and long-term industrial lifecycle support.
Supply support for VS-25FR120 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 demanding industrial and automotive environments.
The VS-25FR120 belongs to the VS-25F(R) Series of stud-mount standard recovery diodes, engineered for rugged line-frequency rectification in high-current, high-voltage industrial power systems.
FAQ
What does the "R" suffix in VS-25FR120 indicate?
The "R" suffix in VS-25FR120 specifies reverse polarity: the anode is connected to the threaded stud, while the cathode is isolated on the base flange. This configuration allows direct mounting of the anode to a grounded heatsink without additional insulation, simplifying thermal and electrical integration in common-cathode rectifier circuits. The VS-25FR120 thus differs from standard "F"-suffix variants where the cathode is stud-mounted.
What is the maximum allowable case temperature for continuous operation of VS-25FR120?
The VS-25FR120 supports continuous operation at a maximum case temperature (TC) of 120 °C, delivering its rated 25 A average forward current under 180° sinusoidal conduction. Exceeding this temperature requires derating per the conduction-angle curves in Figure 1 of the datasheet. At TC = 120 °C, the junction temperature remains within its -65 °C to +175 °C operational limit assuming RthJC = 1.5 K/W and proper heatsinking.
Can VS-25FR120 be used in a full-wave bridge configuration?
Yes, VS-25FR120 can be used in full-wave bridge configurations, but each device must be mounted with appropriate electrical isolation since its stud is the anode. In a standard bridge, two VS-25FR120 units (anode-stud) and two VS-25F120 units (cathode-stud) are typically paired to maintain correct polarity per leg. Using four VS-25FR120 units would require insulated mounting hardware for all studs - making VS-25F120 more practical for symmetric bridge layouts.
What is the I²t rating of VS-25FR120 at 60 Hz, and why does it matter?
The VS-25FR120 has an I²t rating of 580 A²s at 60 Hz for non-repetitive surge conditions with no voltage reapplied. This value quantifies its ability to withstand short-duration overcurrent events - such as transformer inrush or motor startup - without thermal failure. It directly informs fuse selection and protection coordination: a properly rated fast-acting fuse must clear before reaching this I²t threshold to prevent diode destruction.
Does VS-25FR120 meet RoHS and REACH compliance?
Yes, VS-25FR120 complies with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed by Vishay's material declaration document #99912. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and all substances of very high concern (SVHC) are below threshold levels. Compliance status is maintained per Vishay's published environmental policy and updated annually.
VS-25FR120 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:
- 12 mA @ 1200 V
- 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-25FR120 FAQ
1.How can I place an order for VS-25FR120 through Aetrix?
Please submit a Request for Quotation (RFQ) for VS-25FR120 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-25FR120 reliable?
The price and inventory of VS-25FR120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-25FR120 is usually 5 days.
3.What payment methods are accepted for VS-25FR120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-25FR120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VS-25FR120?
VS-25FR120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VS-25FR120 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-25FR120?
For technical support, including VS-25FR120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-25FR120 requirements.
6.How does Aetrix verify that VS-25FR120 is sourced from the original manufacturer or authorized distributors?
All VS-25FR120 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-25FR120 meets industry standards.
7.What is the process for return or replacement of VS-25FR120?
All VS-25FR120 units undergo pre-shipment inspection (PSI). If there is an issue with VS-25FR120, 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-25FR120 part is unused and in its original packaging.
Return procedure for VS-25FR120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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