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Diodes Incorporated MB2505
- Part No.:
- MB2505
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-Square, MB
- Datasheet:
-
MB2505.pdf
- Description:
- BRIDGE RECT 1PHASE 50V 25A MB
- Quantity:
- Payment:
- Shipping:
Inventory:5,630
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Product details
Overview
MB2505 from Diodes Incorporated is a high-current silicon bridge rectifier with 25 A average output current at TC = 55°C, 50 V maximum recurrent peak reverse voltage (VRRM), and 1.1 V typical forward voltage drop at 12.5 A - used in industrial AC/DC power supplies, motor drive front-ends, and welding equipment input stages.
For engineers reviewing the MB2505 datasheet, MB2505 pinout, MB2505 application, or MB2505 equivalent, key selection criteria include thermal resistance (RJC = 2.5 °C/W), faston terminal mounting compatibility, 300 A non-repetitive surge rating, and RoHS-compliant lead-free finish (date code 0514+).
Technical Context
This single-phase full-wave bridge rectifier integrates four high-conductivity silicon diodes in a metal case for enhanced thermal dissipation. It supports universal mounting (snap-on, solder, or PCB) and requires bolt-down installation on a heatsink with silicone thermal compound to maintain junction temperature within –55°C to +150°C operating range.
Rated for 60 Hz resistive or inductive loads, its I²t fusing rating is 373 A²s, and reverse leakage remains ≤10 µA at 25°C and ≤1.0 mA at 100°C under rated DC blocking voltage - critical for reliability in high-temperature industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 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 half-sine) - Peak surge current tolerance; enables handling of transformer inrush and load transients. |
| RJC | 2.5 °C/W - Junction-to-case thermal resistance; dictates minimum heatsink requirement for thermal management. |
| IR | ≤10 µA at 25°C - Reverse leakage per element; ensures low standby power loss in off-state. |
Pinout & Package
MB2505 uses a metal-cased, bolt-down package with four faston terminals (0.25") arranged in standard bridge configuration: two AC inputs (marked "AC"/"~"), one positive DC output (+), and one negative DC output (–). Case material meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | AC Input Terminals | Accept full-wave AC input; electrically symmetrical - either may serve as live or neutral entry point. |
| (+) | Positive DC Output | Delivers rectified positive rail; connected internally to anode of two diodes and cathode of two others. |
| (–) | Negative DC Output | Serves as return path and reference ground; tied to cathode of two diodes and anode of two others. |
Key Features
| Feature | Design Value |
|---|---|
| High-Conductivity Metal Case | Enables direct bolt-down heatsinking with RJC = 2.5 °C/W - reduces thermal bottleneck vs. plastic-packaged bridges. |
| Universal Mounting Terminals | 0.25" Faston lugs support snap-on, solder, or PCB-mount integration without custom hardware. |
| RoHS-Compliant Lead-Free Finish | Meets EU Directive 2002/95/EC (date code 0514+); eliminates Pb while maintaining solderability per MIL-STD-202 Method 208. |
| UL 94V-0 Case Material | Self-extinguishing polymer housing prevents flame propagation in enclosed power enclosures. |
Applications
| Industrial AC/DC Power Supply | Motor Drive Input Stage |
|---|---|
Use Scenario: Converts 50/60 Hz line voltage to unregulated DC bus in DIN-rail mounted power supplies rated ≥300 W. IC Role / Device Role / Timing Role: Full-wave bridge rectifier providing primary AC-to-DC conversion before bulk capacitor filtering and regulation. Use Value: 25 A continuous rating and 300 A surge capacity ensure stable operation during repeated inrush events from downstream capacitive loads. | Use Scenario: Front-end rectification in 3-phase inverter drives where single-phase auxiliary supply powers control circuitry. IC Role / Device Role / Timing Role: High-current DC link generation for gate driver ICs and microcontroller power rails. Use Value: Low 1.1 V VF minimizes conduction loss and self-heating, supporting compact heatsink design in space-constrained drive cabinets. |
| Welding Equipment Power Input | Uninterruptible Power System (UPS) Charger |
Use Scenario: Rectifies high-current AC input feeding thyristor-controlled DC welding output stages. IC Role / Device Role / Timing Role: Primary rectifier delivering high-pulse DC current to energy storage and output switching stages. Use Value: 373 A²s I²t rating withstands repetitive short-duration overloads typical during arc striking and load changes. | Use Scenario: AC mains rectification in offline battery charger modules for 1–3 kVA UPS systems. IC Role / Device Role / Timing Role: Bulk rectification stage supplying charging current to lead-acid or Li-ion battery banks via PWM-controlled buck converter. Use Value: ≤10 µA IR at 25°C ensures minimal standby leakage, preserving battery charge during long idle 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 25 A / 50 V rating; plastic DIP-4 package with leads instead of metal case and faston terminals. | Lacks bolt-down thermal interface; higher RθJA limits power density in high-ambient environments. | Preferred where PCB mounting and lower cost outweigh thermal performance needs. |
| KBPC2505 | Identical electrical specs; metal case but with screw-terminal interface instead of faston lugs. | Requires different mechanical mounting hardware and wiring method; slightly larger footprint. | Selected when field-serviceable terminal blocks are required over quick-connect fastons. |
Compared with MB2505, GBPC2505 trades thermal performance for ease of PCB assembly, while KBPC2505 retains metal-case cooling but replaces faston compatibility with screw terminals - making MB2505 optimal for high-reliability, heatsink-coupled industrial rectification where rapid terminal connection matters.
Availability
MB2505 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, motor drive input stages, and welding equipment requiring stable component supply with proven thermal robustness and legacy design continuity.
Supply support for MB2505 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, serving industrial, computing, consumer, and communications markets with high-reliability components.
The MB series bridge rectifiers were designed for high-power, thermally demanding AC/DC conversion in legacy industrial equipment - emphasizing metal-case thermal efficiency, mechanical mounting flexibility, and long-term reliability over miniaturization.
FAQ
What is the recommended heatsink mounting method for MB2505?
MB2505 must be bolted directly to a heatsink using a #10 screw at ≤20 in·lb torque, with silicone thermal compound applied between the metal case and heatsink surface. This ensures optimal thermal transfer given its RJC = 2.5 °C/W specification and avoids junction overheating under full 25 A load.
Is MB2505 suitable for new designs?
No - Diodes Incorporated explicitly states "NOT RECOMMENDED FOR NEW DESIGN" in the datasheet and recommends migrating to the GBPC25 series. MB2505 remains supported for legacy repair and continuity, but lacks updated packaging, RoHS exemptions, and thermal optimization of newer alternatives.
Does MB2505 have polarity markings on the case?
Yes - the MB2505 case is clearly marked with "(+)", "(–)", and "(AC)" symbols adjacent to their respective terminals. These embossed polarity indicators are visible without magnification and align with the internal bridge topology shown in the mechanical drawing.
What is the moisture sensitivity level (MSL) for MB2505?
MB2505 has MSL Level 1 per J-STD-020C, meaning it is not moisture-sensitive and does not require dry-packaging or baking prior to assembly. This reflects its metal-case construction and absence of hygroscopic plastic encapsulation.
MB2505 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):
- 50 V
- Current - Average Rectified (Io):
- 25 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 12.5 A
- Current - Reverse Leakage @ Vr:
- 10 µA @ 50 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- QC Terminal
- Supplier Device Package:
- MB
MB2505 FAQ
1.How can I place an order for MB2505 through Aetrix?
Please submit a Request for Quotation (RFQ) for MB2505 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 MB2505 reliable?
The price and inventory of MB2505 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB2505 is usually 5 days.
3.What payment methods are accepted for MB2505?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB2505 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB2505?
MB2505 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB2505 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 MB2505?
For technical support, including MB2505 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB2505 requirements.
6.How does Aetrix verify that MB2505 is sourced from the original manufacturer or authorized distributors?
All MB2505 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 MB2505 meets industry standards.
7.What is the process for return or replacement of MB2505?
All MB2505 units undergo pre-shipment inspection (PSI). If there is an issue with MB2505, 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 MB2505 part is unused and in its original packaging.
Return procedure for MB2505:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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