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Diodes Incorporated MBR740
- Part No.:
- MBR740
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
MBR740.pdf
- Description:
- DIODE SCHOTTKY 40V 7.5A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,114
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Product details
Overview
MBR740 from Diodes Incorporated is a 40 V, 7.5 A TO-220AC single-die Schottky barrier rectifier optimized for low-voltage, high-frequency DC/DC conversion, freewheeling, and polarity protection. It delivers 0.57 V forward voltage at 7.5 A and 25°C, supports 150 A non-repetitive surge current, and features guard ring die construction for transient robustness in industrial power supplies and motor drives.
For engineers reviewing the MBR740 datasheet, MBR740 pinout, MBR740 application, or MBR740 equivalent, key selection criteria include its 40 V reverse voltage rating, 3.5 °C/W junction-to-case thermal resistance, low 0.57 V forward drop at rated current, and TO-220AC package compatibility with standard heatsink mounting.
Technical Context
The MBR740 operates as a unidirectional power rectifier with metal–semiconductor junction architecture enabling fast switching and minimal reverse recovery charge. Its guard ring structure enhances ruggedness against voltage transients during inductive load commutation.
Designed for operation up to +150°C junction temperature, it maintains stable forward voltage (0.75 V at 7.5 A, 125°C) and low leakage (0.5 mA at rated VR and 125°C), supporting reliable performance in thermally constrained environments such as enclosed AC/DC adapters and automotive body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage | 40 V - Maximum blocking capability without breakdown in reverse bias |
| Avg. Forward Current | 7.5 A @ TC = +125°C - Continuous DC output current with heatsink cooling |
| Forward Voltage Drop | 0.57 V @ IF = 7.5 A, TJ = +25°C - Low conduction loss enabling >92% efficiency in 5–12 V output stages |
| Surge Current | 150 A (8.3 ms half-sine) - Withstands motor startup or capacitor inrush without failure |
| Thermal Resistance | 3.5 °C/W (Junction-to-Case) - Enables direct heatsink mounting for thermal management |
| Reverse Leakage | 0.5 mA @ VR = 40 V, TJ = +125°C - Minimal standby power loss in battery-backed systems |
Pinout & Package
Package: TO-220AC - Molded plastic case with UL 94V-0 flammability rating, tin-plated terminals, and 2.3 g mass. Mounting tab is cathode-connected and electrically active.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Input terminal for forward conduction | Connected to source side of rectification path; accepts input voltage during conduction |
| Cathode (Lead 2 & Tab) | Output terminal and thermal interface | Common output node; tab serves as both electrical cathode and primary heat path to heatsink |
| Cathode (Lead 3) | Redundant cathode connection | Parallel cathode lead for improved current sharing and mechanical stability in high-current PCB layouts |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves transient voltage immunity during inductive switching events without external snubbers |
| Low forward voltage (0.57 V) | Reduces power dissipation by ~1.8 W vs. comparable silicon diodes at 7.5 A, lowering heatsink requirements |
| High surge capability (150 A) | Eliminates need for oversized derating in applications with repetitive load transients |
| TO-220AC package with isolated tab | Enables direct heatsink mounting while maintaining electrical isolation between tab and PCB ground plane |
Applications
| DC/DC Converter Output Rectification | Automotive Body Control Module Power Supply |
|---|---|
Use Scenario: Secondary-side rectification in 12 V input, 3.3–5 V output synchronous buck converters. IC Role / Device Role / Timing Role: Unidirectional power switch converting high-frequency AC ripple into regulated DC output. Use Value: 0.57 V forward drop minimizes conduction loss, improving full-load efficiency by ≥3% over standard PN diodes. | Use Scenario: Reverse polarity protection and freewheeling in 12 V battery-fed microcontroller power rails. IC Role / Device Role / Timing Role: Polarity guard and inductive energy recirculation path during relay or solenoid deactivation. Use Value: 150 A surge rating withstands load dump transients; 0.75 V VF at 125°C ensures stable operation under hood temperatures. |
| Industrial Motor Drive Freewheeling | LED Driver Input Stage Protection |
Use Scenario: Flyback path for brushed DC motor back-EMF during PWM braking cycles. IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode clamping inductive kickback across H-bridge outputs. Use Value: Near-zero reverse recovery time eliminates switching spikes, reducing EMI filter component count. | Use Scenario: Input polarity protection and surge suppression in constant-current LED drivers powered from 24 V DC rails. IC Role / Device Role / Timing Role: Primary reverse-blocking element preventing damage from accidental reverse connection or line surges. Use Value: Guard ring design sustains 40 V reverse bias with <0.5 mA leakage at 125°C, ensuring long-term reliability in sealed luminaires. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-75SQ040 | Same 40 V VRRM, 7.5 A IO, but TO-263AB package; VF = 0.55 V @ 7.5 A | Surface-mount layout; lower profile; no through-hole mounting or heatsink screw option | Select for space-constrained PCBs where thermal via arrays replace mechanical heatsinks |
| ON Semiconductor MBR740G | Identical specs and TO-220AC package; RoHS-compliant variant with green molding compound | No functional difference; same pinout, thermal behavior, and surge rating | Choose when compliance with halogen-free or "Green" material requirements is mandatory |
Compared with VS-75SQ040 and MBR740G, the Diodes MBR740 offers identical electrical performance in a legacy through-hole package with proven mechanical heatsink integration-ideal for cost-sensitive, high-volume industrial power supplies requiring field-serviceable replacement.
Availability
MBR740 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and LED driver input protection requiring stable component supply and long-lifecycle support.
Supply support for MBR740 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 power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
The MBR7xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for high-efficiency, low-loss DC/DC conversion and freewheeling in thermally demanding power systems.
FAQ
Is the MBR740 still in active production?
No-the MBR740 is marked obsolete per Diodes Incorporated's DS23007 Rev. 11 (July 2015). However, Aetrix Electronics maintains legacy inventory and offers controlled-life supply with full traceability, including date-code verification and RoHS documentation for ongoing production programs.
Can the MBR740 be used as a direct replacement for MBR730 or MBR750?
Yes-pinout, package, and thermal characteristics are identical across the MBR730–MBR750 family. The only differences are peak reverse voltage (30 V / 40 V / 50 V) and corresponding forward voltage and leakage values. Substitution requires verifying that the 40 V rating meets system blocking requirements.
What is the maximum recommended case temperature for continuous operation?
The datasheet specifies 7.5 A average forward current at TC = +125°C. Operation beyond this temperature requires derating per Figure 1; sustained case temperatures above +125°C risk exceeding the +150°C maximum junction temperature, especially under high IF or poor heatsinking.
Does the TO-220AC package require electrical isolation from the heatsink?
Yes-the metal tab is electrically connected to the cathode. If the heatsink is grounded or at a different potential, an insulating washer and shoulder washer must be used to prevent short circuits. Thermal interface material must also be electrically isolating if mounting to a conductive surface.
MBR740 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 7.5A
- Voltage - Forward (Vf) (Max) @ If:
- 840 mV @ 15 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 40 V
- Capacitance @ Vr, F:
- 400pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -55°C ~ 150°C
MBR740 FAQ
1.How can I place an order for MBR740 through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR740 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 MBR740 reliable?
The price and inventory of MBR740 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR740 is usually 5 days.
3.What payment methods are accepted for MBR740?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR740 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR740?
MBR740 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR740 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 MBR740?
For technical support, including MBR740 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR740 requirements.
6.How does Aetrix verify that MBR740 is sourced from the original manufacturer or authorized distributors?
All MBR740 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 MBR740 meets industry standards.
7.What is the process for return or replacement of MBR740?
All MBR740 units undergo pre-shipment inspection (PSI). If there is an issue with MBR740, 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 MBR740 part is unused and in its original packaging.
Return procedure for MBR740:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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