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Diodes Incorporated MB251-F
- Part No.:
- MB251-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-Square, MB
- Datasheet:
-
MB251-F.pdf
- Description:
- BRIDGE RECT 1PHASE 100V 25A MB
- Quantity:
- Payment:
- Shipping:
Inventory:4,756
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Product details
Overview
MB251-F from Diodes Incorporated is a high-current silicon bridge rectifier with 100 V maximum recurrent peak reverse voltage, 25 A average rectified output current at TC = 55°C, and 1.1 V typical forward voltage drop at 12.5 A. It features solderable universal terminals (0.25" Faston), metal case for superior thermal conduction, and is rated for industrial AC/DC power supplies requiring robust 60 Hz rectification.
For engineers reviewing the MB251-F datasheet, MB251-F pinout, MB251-F application, or MB251-F equivalent, key selection criteria include thermal resistance (RJC = 2.5 °C/W), I2t fusing rating (373 A²s), RoHS-compliant lead-free finish (date code 0514+), and bolt-down mounting requirement with thermal compound for heat-sink coupling.
Technical Context
This single-phase full-wave bridge rectifier integrates four silicon diodes in a common anode–common cathode configuration, enabling AC-to-DC conversion without external wiring. Its metal case provides direct thermal path to heatsink, and the 0.25" Faston terminals support snap-on, solder, or PCB-mounting per MIL-STD-202 Method 208.
Rated for operation from –55°C to +150°C junction temperature, it delivers 25 A average output under resistive or inductive 60 Hz loads at case temperature ≤55°C. Reverse leakage remains ≤10 µA at 25°C and ≤1.0 mA at 100°C across its full DC blocking voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 100 V - Maximum peak reverse voltage the device withstands without breakdown during AC cycle. |
| I(AV) | 25.0 A at TC = 55°C - Sustained DC output current capability when case is actively cooled to 55°C. |
| VF | 1.1 V at 12.5 A - Forward voltage drop per diode leg, directly impacting conduction loss and thermal load. |
| IFSM | 300 A (8.3 ms half-sine) - Surge current tolerance during cold-start or line transients. |
| RJC | 2.5 °C/W - Thermal resistance from junction to case, defining minimum heatsink requirement for safe operation. |
| I2t | 373 A²s - Fusing energy threshold; used to coordinate upstream fuse selection for short-circuit protection. |
| TJ, TSTG | –55°C to +150°C - Valid operating and storage temperature envelope for industrial environments. |
Pinout & Package
MB251-F uses a high-conductivity metal case package with four universal 0.25" Faston terminals. Mounting requires bolt-down to heatsink with silicone thermal compound; torque must not exceed 20 in·lb. Case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | AC Input Terminal | One of two alternating current input connections; tied internally to anode of one diode pair and cathode of the other. |
| AC2 | AC Input Terminal | Second AC input; completes full-wave bridge topology with AC1 for bidirectional conduction. |
| + | DC Output Anode | Positive DC output node; internal connection point of both diode anodes in the bridge configuration. |
| – | DC Output Cathode | Negative DC output node; internal connection point of both diode cathodes in the bridge configuration. |
Key Features
| Feature | Design Value |
|---|---|
| High thermal conductivity metal case | Enables direct bolt-down heatsinking with RJC = 2.5 °C/W, reducing need for complex thermal interface layers. |
| Universal 0.25" Faston terminals | Supports snap-on, solder, or PCB mounting per MIL-STD-202 Method 208-no custom tooling required. |
| UL 94V-0 case material | Meets flame-retardant safety standard for enclosed industrial power enclosures and DIN-rail systems. |
| RoHS-compliant lead-free finish | Complies with EU Directive 2002/95/EC (date code 0514+); exempted for high-temp solder and glass passivation. |
Applications
| Industrial AC/DC Power Supply | Motor Drive Front-End Rectification |
|---|---|
Use Scenario: Converts 60 Hz line voltage (e.g., 120 VAC or 240 VAC) to unregulated DC bus in DIN-rail mounted power supplies. IC Role / Device Role / Timing Role: Full-wave bridge rectifier providing isolated, polarity-stable DC output with minimal external components. Use Value: Delivers 25 A continuous output at 55°C case temperature while maintaining <1.1 V forward drop-reducing conduction losses by ~15% vs. legacy 35 A bridges at same current. |
Use Scenario: Rectifies AC input to DC link for 3-phase inverter stages in HVAC and pump drives. IC Role / Device Role / Timing Role: Primary AC-to-DC conversion stage; handles repetitive surge currents up to 300 A during motor startup. Use Value: I2t rating of 373 A²s enables coordination with Class J fuses, preventing nuisance tripping during inrush while ensuring fault clearing. |
| Welding Equipment Power Stage | Uninterruptible Power System (UPS) Charger |
Use Scenario: Supplies high-current DC to welding transformer primary in stick and MIG welders operating at 50/60 Hz. IC Role / Device Role / Timing Role: High-reliability rectification element subjected to repeated short-duration overloads and ambient temperatures up to 70°C. Use Value: Metal case and 150°C max junction temperature allow sustained operation in thermally constrained chassis without forced air cooling. |
Use Scenario: Rectifies utility AC to charge battery bank in line-interactive UPS units with 1–3 kVA capacity. IC Role / Device Role / Timing Role: Input-stage bridge delivering regulated DC after filtering; operates continuously under partial load. Use Value: Low IR (≤10 µA @ 25°C) minimizes standby leakage, preserving battery charge during extended grid-out periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBPC2505 | Same 100 V VRRM, 25 A I(AV), but plastic DIP-4 package (RJA ≈ 25 °C/W); no metal case or Faston terminals. | Requires PCB footprint and heatsink clamp; unsuitable for bolt-down or terminal strip mounting. | Select when space-constrained PCB layout dominates over thermal performance or mechanical mounting flexibility. |
| GBU25J | 25 A I(AV), 600 V VRRM, GBU package with leads; RJC = 3.0 °C/W; no Faston terminals. | Higher voltage rating suits 400 VAC industrial systems; leaded form factor limits high-vibration environments. | Choose for higher-voltage AC inputs where 100 V rating is insufficient, accepting reduced thermal efficiency. |
Compared with GBPC2505 and GBU25J, MB251-F uniquely combines bolt-down metal-case thermal management, universal Faston terminals, and 100 V rating optimized for North American 120/240 VAC distribution-making it irreplaceable where mechanical robustness and thermal headroom are non-negotiable.
Availability
MB251-F is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, motor drive front-end rectification, and welding equipment power stages requiring stable component supply and long-term lifecycle continuity.
Supply support for MB251-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The MB-series bridge rectifiers were engineered for high-reliability industrial power conversion, emphasizing thermal robustness, mechanical mounting flexibility, and compliance with international safety and environmental standards.
FAQ
Is MB251-F RoHS compliant?
Yes, MB251-F carries a lead-free finish compliant with EU Directive 2002/95/EC (RoHS), effective for date codes 0514 and later. Exemptions apply for high-temperature solder and glass passivation per Annex Notes 5 and 7 of the directive.
What is the recommended mounting method for MB251-F?
MB251-F must be bolted directly to a heatsink using a #10 screw with maximum torque of 20 in·lb. A layer of silicone thermal compound is required between the metal case and heatsink surface to minimize thermal resistance and ensure reliable junction temperature control.
Can MB251-F replace MB251 without modification?
Yes-MB251-F is a direct functional and mechanical replacement for MB251. The "F" suffix denotes the RoHS-compliant version with identical electrical specs, package dimensions, terminal layout, and thermal characteristics as the legacy MB251.
Why is MB251-F marked "Not Recommended for New Design"?
Diodes Incorporated recommends GBPC25 series for new designs due to improved thermal performance in plastic packages and broader distribution channel support. MB251-F remains fully supported for existing designs, with no obsolescence timeline announced.
MB251-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-Square, MB
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Diode Type:
- Single Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 100 V
- Current - Average Rectified (Io):
- 25 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 12.5 A
- Current - Reverse Leakage @ Vr:
- 10 µA @ 100 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- QC Terminal
- Supplier Device Package:
- MB
MB251-F FAQ
1.How can I place an order for MB251-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MB251-F 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 MB251-F reliable?
The price and inventory of MB251-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB251-F is usually 5 days.
3.What payment methods are accepted for MB251-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB251-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB251-F?
MB251-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB251-F 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 MB251-F?
For technical support, including MB251-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB251-F requirements.
6.How does Aetrix verify that MB251-F is sourced from the original manufacturer or authorized distributors?
All MB251-F 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 MB251-F meets industry standards.
7.What is the process for return or replacement of MB251-F?
All MB251-F units undergo pre-shipment inspection (PSI). If there is an issue with MB251-F, 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 MB251-F part is unused and in its original packaging.
Return procedure for MB251-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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