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Home > Products > Discrete Semiconductor Products > Diodes > Bridge Rectifiers

Diodes Incorporated MB351

Name: MB351
Brand: Diodes Incorporated
SKU: MB351
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MB351

Manufacturer:: Diodes Incorporated

Category:: Bridge Rectifiers

Package:: 4-Square, MB

Datasheet:: MB351.pdf

Description:: BRIDGE RECT 1PHASE 100V 35A MB

Quantity:: RFQ Add To RFQ list

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Inventory:4,651

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Product details

Overview

MB351 from Diodes Incorporated is a high-current silicon bridge rectifier with 1000 V maximum DC blocking voltage, 35.0 A average rectified output current at TC = 55°C, and 400 A non-repetitive peak forward surge current (8.3 ms), designed for industrial AC/DC power conversion in switch-mode power supplies and motor drive front-ends.

For engineers reviewing the MB351 datasheet, MB351 pinout, MB351 application, or MB351 equivalent, key selection criteria include thermal resistance (R_JC = 2.5 °C/W), faston terminal mounting compatibility, UL 94V-0 case flammability rating, and RoHS-compliant lead-free finish (date code 0514+).

Technical Context

This full-wave bridge rectifier integrates four high-conductivity silicon diodes in a single metal-case package optimized for bolt-down heat-sink mounting with silicone thermal compound. Its design supports 60 Hz resistive or inductive loads and delivers stable rectified output up to 35 A under controlled case temperature conditions.

The device operates across –55°C to +150°C junction temperature range and features universal terminals compatible with snap-on, solder, or PCB board mounting per MIL-STD-202 Method 208. Reverse leakage remains ≤1.0 mA at 100°C and rated V_DC.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - Maximum recurrent peak reverse voltage per element; defines safe AC input voltage handling capability
I_(AV)	35.0 A at T_C = 55°C - Continuous DC output current rating under specified case cooling condition
I_FSM	400 A (8.3 ms) - Surge withstand capability for line transients or startup inrush without failure
V_F	1.2 V at 17.5 A - Forward voltage drop per diode leg; determines conduction loss and thermal load at rated current
R_JC	2.5 °C/W - Junction-to-case thermal resistance; enables accurate heatsink sizing for thermal management
T_J, T_STG	–55°C to +150°C - Operating and storage temperature range; supports harsh industrial environments

Pinout & Package

MB351 uses a high-conductivity metal case package with four universal terminals: two AC inputs (marked "AC" on case), one positive DC output (+), and one negative DC output (–). Mounting requires #10 screw with max 20 in·lb torque and thermal interface material between case and heatsink.

Pin/Terminal	Circuit Role	Design Meaning
AC1, AC2	AC Input Terminals	Accept full-wave AC input; symmetrical connection enables flexible transformer secondary routing
+	Positive DC Output	Delivers rectified positive rail; marked with polarity symbol on case surface
–	Negative DC Output	Serves as return path and system ground reference; marked with polarity symbol on case

Key Features

Feature	Design Value
UL 94V-0 case material	Meets stringent flammability safety standard for enclosed industrial power equipment
0.25" Faston terminals	Enables quick, tool-free connection to bus bars or wire lugs without soldering
29 g unit weight	Supports mechanical stability in vibration-prone applications such as motor control cabinets
Bolt-down heatsink interface	Maximizes thermal transfer efficiency when used with silicone thermal compound (R_JC = 2.5 °C/W)

Applications

Industrial SMPS Front-End

Motor Drive Power Supply

Use Scenario: AC mains input rectification in 3 kW industrial switch-mode power supplies.

IC Role / Device Role / Timing Role: Full-wave bridge rectifier converting 230 VAC/50 Hz to unregulated DC bus.

Use Value: 35 A I_(AV) and 400 A I_FSM support high-power density designs with margin for transient surges.

Use Scenario: DC link generation for three-phase inverter stages in HVAC compressors.

IC Role / Device Role / Timing Role: Primary rectification stage feeding bulk capacitor bank before inverter switching.

Use Value: Metal-case thermal path and R_JC = 2.5 °C/W enable reliable operation at elevated ambient temperatures.

Welding Equipment Power Stage

Uninterruptible Power System (UPS)

Use Scenario: High-current DC supply for IGBT gate drivers and control logic in arc welding inverters.

IC Role / Device Role / Timing Role: Rectifying transformer secondary output to feed regulated auxiliary rails.

Use Value: 1000 V V_RRM accommodates reflected voltage spikes during transformer saturation events.

Use Scenario: Mains-to-DC conversion in online double-conversion UPS systems with battery backup.

IC Role / Device Role / Timing Role: Input bridge rectifier sustaining continuous load during utility outage transitions.

Use Value: –55°C to +150°C operating range ensures reliability across wide environmental conditions in data center deployments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bridge rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
GBPC3510	Same 1000 V V_RRM, 35 A I_(AV), but plastic DIP-4 package with lower R_JA and no metal case	Lower thermal mass; suited for forced-air-cooled PCB-mount designs rather than bolted heatsinks	Select GBPC3510 for space-constrained PCB layouts where mechanical mounting flexibility outweighs thermal performance needs
KBPC3510	Identical electrical ratings, but UL 94V-0 plastic housing and 2.8 °C/W R_JC; lacks faston terminals	Requires solder or screw termination; not compatible with quick-connect wiring harnesses	Choose KBPC3510 when cost sensitivity and standard through-hole assembly dominate over field-serviceable connections

Compared with MB351, GBPC3510 offers PCB integration at the expense of thermal dissipation capability, while KBPC3510 trades terminal versatility for lower unit cost and simplified procurement-both require re-evaluation of heatsinking and mounting strategy.

Availability

MB351 is available at Aetrix Electronics and suitable for industrial SMPS front-ends, motor drive power supplies, and welding equipment requiring stable component supply with long-lifecycle support.

Supply support for MB351 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-reliability industrial power conversion, emphasizing thermal robustness, mechanical durability, and compliance with international safety standards for legacy and retrofit applications.

FAQ

Is MB351 RoHS compliant?

Yes, MB351 features a lead-free finish and is RoHS compliant per EU Directive 2002/95/EC (RoHS), effective for date codes 0514 and later. Exemptions for high-temperature solder and glass passivation are applied per Annex Notes 5 and 7 of the directive.

What is the recommended mounting method for MB351?

MB351 must be bolted directly to a heatsink using a #10 screw with maximum torque of 20 in·lb. A thin layer of silicone thermal compound is required between the metal case and heatsink surface to achieve the specified R_JC = 2.5 °C/W thermal resistance.

Can MB351 replace MB3505 in an existing design?

Yes, MB351 and MB3505 share identical electrical specifications and mechanical footprint. The "1" suffix denotes 100 V V_RRM, but MB351 is part of the MB35xx family with 1000 V rating; confirmation of correct suffix interpretation from Diodes' ordering guide is essential before substitution.

Why is MB351 marked "Not Recommended for New Design"?

Diodes Incorporated recommends the GBPC35 series for new designs due to improved thermal performance in plastic packages, higher surge ratings, and broader distribution channel support. MB351 remains fully supported for legacy repair, maintenance, and life-extension programs.

MB351 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):: 100 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

MB351 FAQ

1.How can I place an order for MB351 through Aetrix?

Please submit a Request for Quotation (RFQ) for MB351 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 MB351 reliable?

The price and inventory of MB351 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB351 is usually 5 days.

3.What payment methods are accepted for MB351?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB351 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MB351?

MB351 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MB351 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 MB351?

For technical support, including MB351 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB351 requirements.

6.How does Aetrix verify that MB351 is sourced from the original manufacturer or authorized distributors?

All MB351 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 MB351 meets industry standards.

7.What is the process for return or replacement of MB351?

All MB351 units undergo pre-shipment inspection (PSI). If there is an issue with MB351, 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 MB351 part is unused and in its original packaging.

Return procedure for MB351:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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