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Diodes Incorporated MB356
- Part No.:
- MB356
- Manufacturer:
- Diodes Incorporated
- Category:
- Bridge Rectifiers
- Package:
- 4-Square, MB
- Datasheet:
-
MB356.pdf
- Description:
- BRIDGE RECT 1PHASE 600V 35A MB
- Quantity:
- Payment:
- Shipping:
Inventory:8,901
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Product details
Overview
MB356 from Diodes Incorporated is a high-current silicon bridge rectifier with 600 V maximum recurrent peak reverse voltage, 35.0 A average rectified output current at TC = 55°C, and 400 A peak forward surge current (8.3 ms half-sine). 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 MB356 datasheet, MB356 pinout, MB356 application, or MB356 equivalent, key selection criteria include its 600 V VRRM rating, 35 A I(AV) derating curve vs. case temperature, 2.5 °C/W junction-to-case thermal resistance, and bolt-down mounting requirement with thermal compound for heatsink coupling.
Technical Context
This device implements a single-phase full-wave bridge configuration using four high-conductivity silicon diodes in a common metal case. Its thermal design centers on direct metal-to-heatsink coupling via bolt-down mounting, enabling sustained 35 A DC output under controlled case temperature conditions.
Electrical behavior follows standard silicon rectifier characteristics: VF = 1.2 V at 17.5 A (rated load), IR ≤ 1.0 mA at 100°C and rated VDC, and I²t fusing rating of 664 A²s - confirming robust surge immunity for line-frequency applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 600 V - Maximum repetitive reverse voltage the bridge withstands without breakdown; defines AC input voltage limit (e.g., ≤ 424 V RMS). |
| I(AV) | 35.0 A at TC = 55°C - Continuous DC output current capability when case temperature is held at 55°C; derates to zero at ~125°C. |
| IFSM | 400 A (8.3 ms half-sine) - Surge current handling for brief line transients; critical for inrush and fault tolerance in unregulated supplies. |
| VF | 1.2 V at 17.5 A - Forward voltage drop per conducting diode pair; determines conduction loss (≈ 2.4 V total drop across bridge at full load). |
| RJC | 2.5 °C/W - Junction-to-case thermal resistance; requires external heatsink with low RCS (case-to-sink) to maintain safe TJ. |
| IR | 1.0 mA at TA = 100°C - Reverse leakage per element at elevated temperature; impacts standby loss and high-impedance circuit integrity. |
Pinout & Package
MB356 uses a metal-case, bolt-down package with four insulated terminals: two AC inputs (marked "AC"/"~"), one positive DC output (+), and one negative DC output (–). Mounting requires #10 screw, 20 in·lb torque, and silicone thermal compound between case and heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | AC Input Terminals | Accept single-phase AC input; internally connected to opposite anodes/cathodes of full-wave bridge; non-polarized. |
| (+) | Positive DC Output | Anode-side common node of two series-connected diodes; delivers rectified positive voltage to load. |
| (–) | Negative DC Output | Cathode-side common node of two series-connected diodes; serves as return path and system ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| High thermal conductivity metal case | Enables direct bolt-down heatsinking with RJC = 2.5 °C/W - essential for sustaining 35 A continuous output. |
| UL 94V-0 flammability rated case | Meets safety standards for enclosure-integrated mounting in industrial equipment without additional fire barriers. |
| 0.25" Faston-compatible terminals | Supports snap-on, solder, or PCB-mounting flexibility while maintaining mechanical stability under vibration. |
| Lead-free, RoHS-compliant finish (Date Code 0514+) | Complies with EU Directive 2002/95/EC; exempted for high-temp solder/glass seals per Annex Notes 5 & 7. |
Applications
| Industrial AC/DC Power Supply | Motor Drive Front-End Rectification |
|---|---|
Use Scenario: 3-phase or single-phase input rectification feeding unregulated DC bus in factory automation power systems. IC Role / Device Role / Timing Role: Full-wave bridge rectifier converting 480 VAC or 240 VAC line input to pulsating DC; operates at 50/60 Hz fundamental frequency. Use Value: 35 A I(AV) and 400 A IFSM support high-power motor drives with transient-heavy loads and minimal derating at 55°C case temp. | Use Scenario: Rectifying AC mains for variable-frequency drive (VFD) DC link capacitors in HVAC blowers and conveyor systems. IC Role / Device Role / Timing Role: High-current, low-VF silicon bridge providing stable DC bus voltage prior to inverter stage switching. Use Value: Metal-case thermal path reduces junction temperature rise by >15°C vs. plastic-packaged alternatives, extending capacitor life and improving reliability. |
| Welding Equipment Power Stage | Uninterruptible Power Supply (UPS) Charger |
Use Scenario: Primary rectification in arc-welding inverters where short-duration, high-current pulses dominate operation. IC Role / Device Role / Timing Role: Surge-rated bridge handling repetitive 400 A half-sine surges during weld initiation without thermal runaway. Use Value: I²t = 664 A²s ensures fusing margin exceeds typical welding duty cycles, preventing catastrophic failure during repeated arc strikes. | Use Scenario: Battery charger front-end in line-interactive UPS units converting utility AC to DC for battery charging and inverter feed. IC Role / Device Role / Timing Role: Bridge rectifier operating continuously at 25–30 A with thermal management via heatsink and forced airflow. Use Value: Low 1.2 V VF at 17.5 A minimizes conduction loss (≈ 42 W total), reducing thermal load on enclosed UPS chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current silicon bridge rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GBPC3506 | Same 600 V VRRM and 35 A I(AV), but plastic GBPC package with isolated leads and lower RJC (1.8 °C/W); no metal case or bolt-down mount. | Preferred for PCB-mounted designs with limited space; unsuitable for direct heatsink coupling without additional thermal interface hardware. | Select GBPC3506 for compact, automated assembly; retain MB356 only when bolt-down thermal performance is mandatory. |
| KBPC3506 | Identical electrical ratings (600 V, 35 A), but ceramic-insulated metal case and different terminal geometry; RJC ≈ 2.8 °C/W. | Used in legacy telecom and medical power supplies where creepage distance and isolation voltage exceed MB356 requirements. | Choose KBPC3506 if reinforced insulation or higher dielectric strength (>3 kV) is required; otherwise MB356 offers better thermal efficiency. |
Compared with GBPC3506 and KBPC3506, MB356 delivers superior thermal transfer via direct metal-to-heatsink mounting but lacks PCB compatibility and enhanced isolation - making it optimal for high-reliability, thermally constrained industrial rectifiers where mechanical mounting is feasible.
Availability
MB356 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 thermal reliability.
Supply support for MB356 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 target high-power linear and switched-mode power conversion, emphasizing thermal robustness, surge resilience, and industrial-grade reliability in harsh ambient environments.
FAQ
Is MB356 RoHS compliant?
Yes, MB356 features 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 seals per Annex Notes 5 and 7 of the directive.
What is the recommended mounting method for MB356?
MB356 must be bolted directly to a heatsink using a #10 screw at maximum 20 in·lb torque, with silicone thermal compound applied between the metal case and heatsink surface to minimize thermal resistance and ensure safe junction temperature operation.
Can MB356 replace MB354 or MB358 in existing designs?
Yes, MB356 is pin- and footprint-compatible with other MB35x variants (e.g., MB354, MB358), differing only in VRRM rating (600 V vs. 400 V or 800 V). Electrical substitution requires verification that 600 V meets system peak reverse voltage requirements.
Why is MB356 marked "Not Recommended for New Design"?
Diodes Incorporated recommends the GBPC35 series for new designs due to improved manufacturability, tighter parameter distributions, and broader distribution channel support - though MB356 remains fully qualified, supported, and available for legacy and repair applications.
MB356 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):
- 600 V
- Current - Average Rectified (Io):
- 35 A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 17.5 A
- Current - Reverse Leakage @ Vr:
- 10 µA @ 600 V
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- QC Terminal
- Supplier Device Package:
- MB
MB356 FAQ
1.How can I place an order for MB356 through Aetrix?
Please submit a Request for Quotation (RFQ) for MB356 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 MB356 reliable?
The price and inventory of MB356 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB356 is usually 5 days.
3.What payment methods are accepted for MB356?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB356 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB356?
MB356 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB356 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 MB356?
For technical support, including MB356 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB356 requirements.
6.How does Aetrix verify that MB356 is sourced from the original manufacturer or authorized distributors?
All MB356 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 MB356 meets industry standards.
7.What is the process for return or replacement of MB356?
All MB356 units undergo pre-shipment inspection (PSI). If there is an issue with MB356, 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 MB356 part is unused and in its original packaging.
Return procedure for MB356:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MB356 Tags
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HDS10M-13
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