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Diodes Incorporated MB3505-F
- Part No.:
- MB3505-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-Square, MB
- Datasheet:
-
MB3505-F.pdf
- Description:
- BRIDGE RECT 1PHASE 50V 35A MB
- Quantity:
- Payment:
- Shipping:
Inventory:4,172
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Product details
Overview
MB3505-F from Diodes Incorporated is a high-current silicon bridge rectifier with 50 V maximum recurrent peak reverse voltage, 35 A average rectified output current at TC = 55°C, and 1.1 V typical forward voltage drop at 17.5 A, used in industrial AC/DC power supplies and motor drive front-end rectification.
For engineers reviewing the MB3505-F datasheet, MB3505-F pinout, MB3505-F application, or MB3505-F equivalent, this part supports high-thermal-efficiency bolt-down mounting on heatsinks, delivers stable DC bus generation under 60 Hz inductive loads, and requires attention to case temperature derating above 55°C.
Technical Context
This full-wave bridge rectifier integrates four high-conductivity silicon diodes in a single metal-case package with universal terminals (Faston/solder/PCB mount). Its thermal design centers on low junction-to-case resistance (2.5 °C/W) and mandatory silicone thermal compound interface for bolt-down heatsink mounting.
Rated for operation from –55°C to +150°C, it exhibits 10 µA max reverse leakage at 25°C and 1.0 mA at 100°C under rated DC blocking voltage, with I²t fusing rating of 664 A²s for 8.3 ms surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum peak reverse voltage per diode leg; defines safe AC input range before breakdown. |
| I(AV) | 35.0 A at TC = 55°C - Continuous DC output current capability when case is actively cooled to 55°C. |
| VF | 1.1 V at 17.5 A - Forward voltage drop per conducting diode pair; determines conduction loss and heat generation. |
| IFSM | 400 A - Non-repetitive surge current tolerance for 1/2-cycle 60 Hz events; critical for inrush handling. |
| RJC | 2.5 °C/W - Thermal resistance from junction to case; mandates external heatsink with ≤0.5 °C/W RSA for full 35 A rating. |
| IR | 10 µA at 25°C - Reverse leakage per element; impacts standby power and high-impedance sensing accuracy. |
Pinout & Package
Package: Metal case with four universal terminals (AC1, AC2, +, –), UL 94V-0 rated, 29 g mass, designed for bolt-down heatsink mounting using #10 screw (20 in·lb max torque).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | AC Input Terminal 1 | One leg of AC input; connects to transformer secondary or line input; symmetrical with AC2. |
| AC2 | AC Input Terminal 2 | Second leg of AC input; completes full-wave bridge input path with AC1. |
| (+) | Positive DC Output | Anode of output diode pair; delivers rectified positive DC voltage to filter capacitor or load. |
| (–) | Negative DC Output / Common Return | Cathode of output diode pair; serves as system ground reference and return path for DC load current. |
Key Features
| Feature | Design Value |
|---|---|
| High thermal conductivity metal case | Enables direct bolt-down heatsink mounting with <2.5 °C/W RJC, eliminating need for insulated mounting hardware. |
| Universal terminal options | Supports Faston snap-on, solder lug, or PCB tab mounting-no redesign needed across assembly methods. |
| 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 enclosure meets fire-safety requirements for enclosed power equipment and control cabinets. |
Applications
| Industrial AC/DC Power Supply | Motor Drive Front-End Rectifier |
|---|---|
Use Scenario: Converting 50/60 Hz AC mains or transformer output to unregulated DC bus in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Full-wave bridge rectifier providing bipolar AC-to-unidirectional DC conversion with minimal conduction loss. Use Value: 35 A continuous rating and 400 A surge capacity support high-power industrial loads without parallel devices. | Use Scenario: Rectifying AC input to DC link in 3-phase inverter drives feeding induction motors up to 5 HP. IC Role / Device Role / Timing Role: Primary rectification stage delivering stable DC bus voltage prior to IGBT inverter stage. Use Value: Low 1.1 V VF reduces conduction losses at high RMS currents, improving overall drive efficiency and thermal margin. |
| Welding Equipment Power Stage | Uninterruptible Power Supply (UPS) Charger |
Use Scenario: High-duty-cycle rectification in arc welding power sources with repetitive short-duration surges. IC Role / Device Role / Timing Role: Main AC input rectifier handling intermittent 400 A surge peaks while sustaining 25–30 A average output. Use Value: 664 A²s I²t rating ensures robust fusing margin against welder inrush and short-circuit transients. | Use Scenario: Battery charger front-end in line-interactive UPS systems requiring reliable 24/7 operation. IC Role / Device Role / Timing Role: Mains-fed bridge rectifier charging lead-acid or LiFePO₄ battery banks via controlled DC-DC stage. Use Value: 10 µA reverse leakage at 25°C minimizes no-load power drain during utility-powered standby mode. |
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 |
|---|---|---|---|
| GBPC3505 | Same 50 V VRRM and 35 A I(AV), but plastic case (RJC = 3.0 °C/W), lower IFSM (350 A), and PCB-mount only terminals. | Preferred where PCB space is constrained and heatsink integration is via thermal pad; unsuitable for bolt-down metal chassis mounting. | Select GBPC3505 for compact SMT-compatible designs; retain MB3505-F when mechanical ruggedness and direct heatsink coupling are required. |
| KBPC3505 | Identical electrical ratings (50 V, 35 A, 1.1 V VF), but ceramic-insulated metal case, higher RJC (3.5 °C/W), and no RoHS exemption documentation. | Used in legacy military/aerospace programs requiring MIL-spec insulation; lacks documented lead-free compliance for new industrial designs. | Choose KBPC3505 only if ceramic isolation is mandated; otherwise MB3505-F offers superior thermal performance and verified RoHS status. |
Compared with GBPC3505 and KBPC3505, MB3505-F delivers the lowest thermal resistance (2.5 °C/W), highest surge rating (400 A), and certified RoHS compliance-making it optimal for thermally demanding, high-reliability industrial rectification where bolt-down heatsinking is feasible.
Availability
MB3505-F is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, motor drive front-ends, and welding equipment requiring stable component supply and long-term thermal reliability.
Supply support for MB3505-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, serving industrial, computing, consumer, and communications markets with over 50 years of power device expertise.
The MB series bridges target high-current, high-reliability AC/DC conversion in harsh environments-designed specifically for bolt-down thermal management and long-lifecycle industrial deployments.
FAQ
What is the recommended heatsink mounting method for MB3505-F?
MB3505-F must be mounted 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 configuration achieves the specified 2.5 °C/W RJC and enables full 35 A current rating at TC = 55°C.
Does MB3505-F support RoHS compliance without exemptions?
No-MB3505-F complies with RoHS Directive 2002/95/EC under exemptions for glass and high-temperature solder (Annex Notes 5 and 7), effective for date codes 0514+. Full exemption documentation is provided in Diodes' EC Declaration of Conformity.
Can MB3505-F replace MB3505 in existing designs?
Yes-MB3505-F is functionally and mechanically identical to MB3505, with identical pinout, ratings, and packaging. The "-F" suffix denotes tape-and-reel packaging per Diodes' internal ordering convention; electrical and thermal performance are unchanged.
Why is MB3505-F marked "Not Recommended for New Design"?
Diodes recommends GBPC35 series for new designs due to improved manufacturability and broader distribution-but MB3505-F remains fully supported, in active production, and qualified for legacy replacement, repair, and long-lifecycle industrial applications where its metal-case thermal advantages are critical.
MB3505-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):
- 50 V
- Current - Average Rectified (Io):
- 35 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 17.5 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
MB3505-F FAQ
1.How can I place an order for MB3505-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MB3505-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 MB3505-F reliable?
The price and inventory of MB3505-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB3505-F is usually 5 days.
3.What payment methods are accepted for MB3505-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB3505-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB3505-F?
MB3505-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB3505-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 MB3505-F?
For technical support, including MB3505-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB3505-F requirements.
6.How does Aetrix verify that MB3505-F is sourced from the original manufacturer or authorized distributors?
All MB3505-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 MB3505-F meets industry standards.
7.What is the process for return or replacement of MB3505-F?
All MB3505-F units undergo pre-shipment inspection (PSI). If there is an issue with MB3505-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 MB3505-F part is unused and in its original packaging.
Return procedure for MB3505-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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