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Diodes Incorporated MB352
- Part No.:
- MB352
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-Square, MB
- Datasheet:
-
MB352.pdf
- Description:
- BRIDGE RECT 1PHASE 200V 35A MB
- Quantity:
- Payment:
- Shipping:
Inventory:7,056
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Product details
Overview
MB352 from Diodes Incorporated is a high-current silicon bridge rectifier with 600 V maximum recurrent peak reverse voltage, 35 A average rectified output current at TC = 55°C, and 400 A non-repetitive peak forward surge current; it features solderable universal terminals (0.25" Faston), metal case for superior thermal conduction, and is used in industrial AC/DC power supplies requiring robust line rectification.
For engineers reviewing the MB352 datasheet, MB352 pinout, MB352 application, or MB352 equivalent, this part is selected for high-power linear and switching power supplies where thermal management, surge immunity, and mechanical mounting flexibility (bolt-down with thermal compound) are critical design constraints.
Technical Context
This single-phase full-wave bridge rectifier integrates four high-conductivity silicon diodes in a common anode–common cathode configuration. Its metal case provides direct thermal path to heatsink, with junction-to-case thermal resistance of 2.5°C/W and case-to-ambient resistance of 0.5°C/W under forced-air conditions.
Rated for operation from –55°C to +150°C, it delivers 35 A average DC output under 60 Hz resistive/inductive loads at 55°C case temperature. Reverse leakage is limited to 10 µA at 25°C and 1.0 mA at 100°C across its full blocking voltage range up to 600 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 600 V - Maximum peak reverse voltage the device blocks without breakdown; defines AC input voltage rating (e.g., 420 V RMS). |
| I(AV) | 35.0 A at TC = 55°C - Sustained DC output current capability when case is actively cooled to 55°C. |
| IFSM | 400 A (8.3 ms half-sine) - Surge withstand capacity during cold-start inrush or short-circuit events. |
| VF | 1.2 V at 17.5 A - Forward voltage drop per diode pair; determines conduction loss (≈42 W total at full load). |
| RJC | 2.5 °C/W - Thermal resistance from junction to metal case; enables direct heatsink coupling for high-power dissipation. |
| IR | 10 µA at 25°C - Reverse leakage per element; ensures low standby power loss in high-impedance circuits. |
| I²t | 664 A²s - Fusing energy rating; used to coordinate upstream fuse selection for short-circuit protection. |
Pinout & Package
Package: Metal-case, bolt-down bridge rectifier with integrated 0.25" Faston terminals and polarity markings on case surface. Dimensions: 28.4–28.7 mm (A) × 10.97–11.23 mm (B) × 15.5–17.6 mm (C); weight ≈29 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 | AC Input Terminal | One AC input node; connected internally to anode of D1 and cathode of D2 in full-wave bridge topology. |
| AC2 | AC Input Terminal | Second AC input node; connected internally to anode of D3 and cathode of D4. |
| (+) | DC Output Anode | Common cathode node of D1 and D3; delivers positive DC output. |
| (–) | DC Output Cathode | Common anode node of D2 and D4; serves as DC return/ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| High thermal conductivity metal case | Enables direct bolt-down mounting to heatsink with silicone thermal compound, reducing system thermal resistance by >50% vs. PCB-mount alternatives. |
| UL 94V-0 flammability rated case | Meets safety standards for enclosure-integrated power modules in industrial equipment without additional flame barriers. |
| 0.25" Faston universal terminals | Supports snap-on, solder, or PC board mounting-eliminates need for custom terminal blocks in field-serviceable designs. |
| Lead-free, RoHS-compliant finish | Complies with EU Directive 2002/95/EC (exemptions applied); suitable for global production without rework or compliance risk. |
Applications
| Industrial AC/DC Power Supply | Welding Equipment Rectifier |
|---|---|
Use Scenario: 3-phase or single-phase line-fed unregulated DC bus generation for motor drives and PLC power stages. IC Role / Device Role / Timing Role: Primary AC-to-DC conversion stage; handles continuous 35 A load with 400 A surge tolerance during motor startup. Use Value: Metal case and 2.5°C/W RJC allow stable operation at 150°C junction temperature without derating in enclosed cabinets. | Use Scenario: High-current DC output stage in arc welding inverters and resistance weld controllers. IC Role / Device Role / Timing Role: Full-wave rectification of transformer secondary output prior to IGBT inverter stage. Use Value: 664 A²s I²t rating coordinates with fast-acting fuses to protect downstream IGBTs during short-circuit faults. |
| Uninterruptible Power System (UPS) | Electroplating Power Converter |
Use Scenario: Battery-charging rectifier in online double-conversion UPS systems with bidirectional AC/DC stages. IC Role / Device Role / Timing Role: Line-frequency rectifier feeding bulk capacitor bank; must sustain 35 A average while surviving generator waveform distortion. Use Value: Low 10 µA IR at 25°C minimizes self-discharge during battery float mode, improving energy efficiency. | Use Scenario: Constant-current DC source for industrial electrochemical processes operating 24/7 at 30–35 A. IC Role / Device Role / Timing Role: Main rectifier delivering ripple-free DC after LC filtering; operates continuously at elevated ambient temperatures. Use Value: UL 94V-0 case and 150°C max operating temperature ensure reliability in corrosive, high-humidity plating environments. |
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 |
|---|---|---|---|
| GBPC3506 | 600 V VRRM, 35 A I(AV), plastic package with screw terminals; RJC = 3.0°C/W. | No metal case; requires external heatsink clamping; lower thermal performance in space-constrained enclosures. | Preferred for cost-sensitive, lower-power-density designs where bolt-down mounting is not required. |
| KBPC3510 | 1000 V VRRM, 35 A I(AV), metal case, but VF = 1.3 V at 17.5 A and IFSM = 350 A. | Higher blocking voltage suits 3-phase 575 V AC inputs; higher VF increases conduction loss by ~8.3 W at full load. | Select when system input voltage exceeds 600 V peak or when legacy KBPC footprint compatibility is mandatory. |
Compared with MB352, GBPC3506 trades thermal performance for lower cost and simplified mounting, while KBPC3510 extends voltage rating at the expense of forward loss and surge margin-making MB352 optimal for 600 V-class industrial rectifiers demanding thermal headroom and surge resilience.
Availability
MB352 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, welding equipment rectifiers, and uninterruptible power systems requiring stable component supply and long-term manufacturability.
Supply support for MB352 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, specializing in high-reliability power management, signal integrity, and protection solutions.
The MB series bridges target high-current, thermally demanding AC/DC conversion in industrial and infrastructure applications-designed for direct heatsink integration, mechanical ruggedness, and long-life operation in harsh environments.
FAQ
What is the recommended heatsink mounting method for MB352?
Mount MB352 directly to a flat, clean aluminum heatsink using a #10 screw and silicone thermal compound between the metal case and surface. Apply torque ≤20 in·lb. Avoid insulating pads unless electrically isolated mounting is required-then use thermally conductive, electrically isolating materials rated for >150°C.
Can MB352 be used in a three-phase full-wave rectifier configuration?
No-MB352 is a single-phase, four-diode bridge. For three-phase rectification, six discrete diodes or a dedicated three-phase bridge (e.g., DB100J) must be used. Using MB352 in three-phase setups results in incomplete conduction and excessive stress on individual diodes.
Is MB352 compliant with lead-free assembly processes?
Yes-MB352 has a lead-free finish and is RoHS compliant (per EC Directive 2002/95/EC, exemptions applied). It supports standard Pb-free reflow profiles up to 260°C peak, and its terminals are solderable per MIL-STD-202, Method 208.
Why is MB352 marked "Not Recommended for New Design"?
Diodes Incorporated recommends GBPC35 series as a drop-in replacement with improved thermal performance, tighter parameter tolerances, and active product lifecycle support. MB352 remains available for legacy repair and continuity, but new designs should evaluate GBPC3506 or GBPC3510 for enhanced reliability and supply assurance.
MB352 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):
- 200 V
- Current - Average Rectified (Io):
- 35 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 17.5 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
MB352 FAQ
1.How can I place an order for MB352 through Aetrix?
Please submit a Request for Quotation (RFQ) for MB352 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 MB352 reliable?
The price and inventory of MB352 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB352 is usually 5 days.
3.What payment methods are accepted for MB352?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB352 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB352?
MB352 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB352 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 MB352?
For technical support, including MB352 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB352 requirements.
6.How does Aetrix verify that MB352 is sourced from the original manufacturer or authorized distributors?
All MB352 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 MB352 meets industry standards.
7.What is the process for return or replacement of MB352?
All MB352 units undergo pre-shipment inspection (PSI). If there is an issue with MB352, 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 MB352 part is unused and in its original packaging.
Return procedure for MB352:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MB352 Tags
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