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Diodes Incorporated MB254
- Part No.:
- MB254
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-Square, MB
- Datasheet:
-
MB254.pdf
- Description:
- BRIDGE RECT 1PHASE 400V 25A MB
- Quantity:
- Payment:
- Shipping:
Inventory:9,632
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Product details
Overview
MB254 from Diodes Incorporated is a high-current silicon bridge rectifier with 400 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 in motor drives and welding equipment.
For engineers reviewing the MB254 datasheet, MB254 pinout, MB254 application, or MB254 equivalent, this part serves as a discrete full-wave rectification device requiring bolt-down heatsink mounting, thermal compound interface, and attention to I²t fusing rating (373 A²s) and junction-to-case thermal resistance (2.5 °C/W).
Technical Context
This bridge rectifier integrates four silicon diodes in a single-phase full-wave configuration with AC input terminals (two), positive DC output (+), and negative DC output (–). Its metal case provides direct thermal path to heatsink, enabling sustained 25 A output under controlled case temperature conditions.
Rated for 60 Hz resistive or inductive loads, it supports surge currents up to 300 A (8.3 ms half-sine), exhibits <10 µA reverse leakage at 25°C, and maintains stable operation across –55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum peak reverse voltage per diode leg; defines safe AC input voltage ceiling before breakdown. |
| I(AV) | 25.0 A at TC = 55°C - Continuous DC output current capability when case temperature is held at 55°C. |
| VF | 1.1 V at 12.5 A - Forward voltage drop per conducting diode pair; determines conduction loss and heat generation. |
| IFSM | 300 A (8.3 ms) - Non-repetitive surge current rating; critical for inrush and short-circuit withstand design. |
| RJC | 2.5 °C/W - Junction-to-case thermal resistance; used with heatsink RCA to calculate max junction temperature. |
| IR | 10 µA at 25°C - Reverse leakage per element; impacts standby power loss and high-impedance circuit integrity. |
| I²t | 373 A²s - Fusing integral; informs fuse selection to clear faults before catastrophic failure. |
Pinout & Package
Package: High-conductivity metal case with 0.25" Faston terminals; UL 94V-0 flammability rating; 29 g mass; bolt-down mounting with #10 screw hole (H: 4.85–5.59 mm); requires silicone thermal compound interface to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | AC Input Terminal | One of two alternating current input connections; symmetrical with AC2 for full-wave bridge operation. |
| AC2 | AC Input Terminal | Second AC input terminal; forms center-tapped equivalent with AC1 for rectification. |
| (+) | Positive DC Output | Anode-side common output node; delivers unidirectional current to load or filter capacitor. |
| (–) | Negative DC Output | Cathode-side common return node; completes DC path and serves as system ground reference. |
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 vias or PCB copper pours. |
| Universal mounting terminals | 0.25" Faston lugs support snap-on, solder, or PCB board mounting-flexible integration into legacy and new power assemblies. |
| Lead-free, RoHS-compliant finish | Meets EU Directive 2002/95/EC with exemptions applied; suitable for environmentally regulated industrial production. |
| UL 94V-0 case material | Self-extinguishing plastic housing meets flame-retardant safety standard for enclosed power equipment. |
| Moisture sensitivity Level 1 | No dry-pack or baking required prior to assembly; simplifies SMT and manual soldering logistics. |
Applications
| Industrial Motor Drives | Welding Power Supplies |
|---|---|
Use Scenario: Rectifying 3-phase or single-phase AC mains to DC bus for IGBT gate drivers and PWM inverters. IC Role / Device Role / Timing Role: Discrete full-wave bridge rectifier providing primary DC rail; not an IC or timing device. Use Value: 25 A continuous output and 300 A surge rating sustain high-duty-cycle operation during motor startup and regenerative braking. |
Use Scenario: Converting transformer-isolated AC to high-current DC for arc initiation and stable weld current control. IC Role / Device Role / Timing Role: High-current discrete rectifier handling intermittent 100+ A peak loads with low VF and robust thermal path. Use Value: Metal case and bolt-down mounting enable reliable heat dissipation without forced air, critical in portable welders. |
| Uninterruptible Power Systems | Industrial Battery Chargers |
Use Scenario: AC-to-DC conversion in line-interactive UPS front-end where reliability and thermal margin are paramount. IC Role / Device Role / Timing Role: Primary rectification stage feeding bulk capacitor and downstream DC/DC converters. Use Value: Low IR (10 µA @ 25°C) minimizes standby leakage, extending battery runtime during utility outages. |
Use Scenario: Charging lead-acid or LiFePO₄ battery banks in telecom cabinets or solar hybrid systems. IC Role / Device Role / Timing Role: High-efficiency bridge rectifier delivering regulated DC after transformer step-down and filtering. Use Value: 1.1 V VF at 12.5 A reduces conduction loss by ~14% vs. older 1.25 V bridges, improving charger efficiency at 20–30 A loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-wave bridge rectification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBPC2504 | 400 V VRRM, 25 A I(AV), plastic package (RJC = 3.0 °C/W), PCB-mountable with leads. | Lower thermal performance; suited for lower ambient or forced-air-cooled designs where metal case mounting is impractical. | Select when board space constraints preclude bolt-down metal packages and thermal load is ≤18 A continuous. |
| GBU2504 | 400 V VRRM, 25 A I(AV), GBU package (RJC = 2.8 °C/W), single-in-line leads, no metal case. | Limited heatsinking capability; requires external clip-on heatsink or large copper pour for >15 A operation. | Prefer for cost-sensitive, medium-power SMPS where mechanical ruggedness and bolt-down mounting are unnecessary. |
Compared with MB254, GBPC2504 offers easier PCB assembly but sacrifices 0.5 °C/W thermal resistance and mechanical robustness; GBU2504 further reduces thermal margin and mounting flexibility, making MB254 preferable for high-reliability, high-ambient, or vibration-prone environments.
Availability
MB254 is available at Aetrix Electronics and suitable for industrial motor drives, welding power supplies, and uninterruptible power systems requiring stable component supply and long-term manufacturability assurance.
Supply support for MB254 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 California, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The MB-series bridge rectifiers were developed for high-current, thermally demanding AC/DC conversion in industrial power equipment, emphasizing metal-case thermal efficiency and mechanical durability over compact packaging.
FAQ
Is MB254 RoHS compliant?
Yes, MB254 has a lead-free finish and is RoHS compliant per EU Directive 2002/95/EC (with applicable exemptions for high-temperature solder and glass), effective for date codes 0514 and later. Compliance is verified per JESD22-A112 and JEDEC standards.
What is the recommended mounting torque for MB254?
The mounting torque for the #10 screw used to secure MB254 to a heatsink must not exceed 20 in·lb (2.26 N·m). Exceeding this value risks case deformation, thermal interface disruption, or terminal damage.
Can MB254 be used in surface-mount applications?
No - MB254 uses 0.25" Faston terminals and a metal case designed exclusively for bolt-down heatsink mounting with thermal compound. It lacks SMT-compatible leads or pads and is not rated for reflow or wave soldering.
Why is MB254 marked "Not Recommended for New Design"?
Diodes Incorporated recommends GBPC25 or GBPC35 series replacements due to improved thermal performance, tighter parameter tolerances, and enhanced reliability testing. MB254 remains fully supported for existing designs and legacy repair, with no announced obsolescence.
MB254 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-Square, MB
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Diode Type:
- Single Phase
- Technology:
- Standard
- Voltage - Peak Reverse (Max):
- 400 V
- Current - Average Rectified (Io):
- 25 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 12.5 A
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- QC Terminal
- Supplier Device Package:
- MB
MB254 FAQ
1.How can I place an order for MB254 through Aetrix?
Please submit a Request for Quotation (RFQ) for MB254 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 MB254 reliable?
The price and inventory of MB254 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB254 is usually 5 days.
3.What payment methods are accepted for MB254?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB254 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB254?
MB254 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB254 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 MB254?
For technical support, including MB254 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB254 requirements.
6.How does Aetrix verify that MB254 is sourced from the original manufacturer or authorized distributors?
All MB254 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 MB254 meets industry standards.
7.What is the process for return or replacement of MB254?
All MB254 units undergo pre-shipment inspection (PSI). If there is an issue with MB254, 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 MB254 part is unused and in its original packaging.
Return procedure for MB254:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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