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Vishay General Semiconductor - Diodes Division MBR745
- Part No.:
- MBR745
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
MBR745.pdf
- Description:
- DIODE SCHOTTKY 45V 7.5A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,060
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Product details
Overview
MBR745 from Vishay is a 7.5 A, 45 V Schottky rectifier in TO-220AC package, optimized for low reverse leakage at high temperature (up to 150 °C TJ), with 0.57 V forward voltage at 7.5 A and 125 °C - used in switching power supplies, DC/DC converters, and reverse battery protection circuits.
For engineers reviewing the MBR745 datasheet, MBR745 pinout, MBR745 application, or MBR745 equivalent, key selection criteria include its 45 V reverse voltage rating, 690 A non-repetitive surge capability, thermal resistance of 3.0 °C/W (junction-to-case), and suitability for industrial-grade high-frequency rectification where low VF and ruggedness are critical.
Technical Context
The MBR745 employs proprietary Schottky barrier technology enabling stable operation up to 150 °C junction temperature while maintaining low IRM (15 mA at 125 °C) and low VF (0.57 V @ 7.5 A, 125 °C). Its guard ring structure enhances ruggedness against transient overstress and long-term reliability under thermal cycling.
Designed for high-frequency switching applications, it delivers fast recovery (no minority carrier storage), low junction capacitance (400 pF @ 5 V), and high dV/dt capability (1000 V/µs), making it suitable for synchronous rectification and freewheeling roles in compact, thermally constrained power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 7.5 A average forward current - supports continuous conduction mode in 50–100 W SMPS designs |
| VRRM | 45 V maximum repetitive reverse voltage - enables use in 36 V nominal battery systems with margin |
| VF @ 7.5 A, 125 °C | 0.57 V - reduces conduction loss by ~30% vs. standard silicon diodes in high-temp operation |
| IRM @ 125 °C | 15 mA - ensures minimal leakage-induced inefficiency in hot environments |
| RthJC | 3.0 °C/W - allows direct heatsink mounting for thermal management without forced air |
| IFSM | 690 A peak surge (5 µs sine) - withstands inrush and fault currents in automotive and industrial inputs |
| CT @ 5 V | 400 pF - limits capacitive switching loss and EMI generation in >100 kHz topologies |
Pinout & Package
Package: TO-220AC - insulated case, single-ended vertical mount, metal tab (cathode) electrically connected to pin 2; designed for mechanical robustness and moisture resistance via high-purity epoxy encapsulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Main current entry point; connects to input/high-side node in buck/flyback secondary or freewheel path |
| 2 | Cathode / Case | Common output terminal and heatsink interface; electrically tied to cathode, requires isolation if mounted to grounded chassis |
| 3 | Not applicable | TO-220AC is 2-terminal device; pin 3 is absent - only pins 1 (anode) and 2 (cathode/tab) are functional |
Key Features
| Feature | Design Value |
|---|---|
| 150 °C junction operation | Enables deployment in sealed enclosures or high-ambient environments without derating beyond datasheet limits |
| Guard ring construction | Improves edge breakdown immunity and extends lifetime under repetitive avalanche stress (EAS = 7 mJ) |
| Low VF at elevated temperature | Maintains efficiency in thermally demanding applications where silicon diodes exhibit significant VF rise |
| High-purity epoxy encapsulation | Provides enhanced mechanical strength and moisture resistance per industrial qualification standards |
| Rated for industrial-level reliability | Validated for extended life under thermal cycling, humidity, and vibration per Vishay High Power Products requirements |
Applications
| Switching Power Supplies | DC/DC Converters |
|---|---|
Use Scenario: Secondary-side rectification in 24–48 V input offline SMPS delivering 30–80 W. IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diode to reduce conduction loss and improve efficiency. Use Value: 0.57 V VF at 125 °C lowers power dissipation by ~1.2 W vs. comparable silicon diode, reducing heatsink size. | Use Scenario: Synchronous rectification in isolated flyback or forward converter outputs for telecom and industrial rails. IC Role / Device Role / Timing Role: Freewheeling diode handling reverse recovery energy during MOSFET off-time. Use Value: Zero reverse recovery charge eliminates switching loss spikes and associated EMI, improving EMC compliance. |
| Reverse Battery Protection | Automotive Body Control Modules |
Use Scenario: Polarity protection in 12/24 V vehicle subsystems (e.g., infotainment, lighting control). IC Role / Device Role / Timing Role: Series-connected anode-in configuration blocking reverse current during battery misconnection. Use Value: Low VF minimizes voltage drop across protection path, preserving system operating margin down to 9 V cold-crank. | Use Scenario: Input rectification and load dump suppression in BCM power distribution units. IC Role / Device Role / Timing Role: Clamping and freewheeling element during relay coil de-energization and alternator transients. Use Value: 690 A IFSM withstands ISO 7637-2 pulse 5a (load dump), eliminating need for parallel TVS devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STPS745D | Same 7.5 A / 45 V rating; VF = 0.59 V @ 7.5 A, 125 °C; RthJC = 3.5 °C/W; TO-220AC package | Slightly higher thermal resistance; lower surge rating (500 A vs. 690 A) | Preferred where STMicroelectronics supply chain alignment or automotive AEC-Q101 qualification is required |
| ON Semiconductor MBR745G | Identical electrical specs and TO-220AC package; Pb-free variant with same VF, IRM, and IFSM | No functional difference; RoHS-compliant marking and processing per J-STD-020 | Drop-in replacement where lead-free compliance is mandatory and Vishay sourcing is constrained |
Compared with MBR745, STPS745D offers comparable voltage/current ratings but reduced surge robustness and higher thermal resistance, while MBR745G provides identical performance in a fully RoHS-compliant build - both serve as viable alternatives depending on qualification or compliance priorities.
Availability
MBR745 is available at Aetrix Electronics and suitable for switching power supplies, DC/DC converters, and reverse battery protection requiring stable component supply, consistent parametric performance, and industrial-grade reliability across production volumes.
Supply support for MBR745 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
Vishay Intertechnology is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability power, sensing, and optoelectronic solutions for industrial, automotive, and computing markets.
The MBR7.. series is part of Vishay High Power Products' Schottky rectifier line, engineered for high-efficiency, high-temperature rectification in demanding power conversion systems where low VF, low IRM, and rugged packaging are essential.
FAQ
What is the maximum junction temperature rating for the MBR745?
The MBR745 is rated for a maximum junction temperature (TJ) of 150 °C, validated through Vishay's industrial qualification process. This allows reliable operation in high-ambient environments such as enclosed power supplies or under-hood automotive modules. The device maintains specified VF and IRM performance up to this limit, as confirmed in the datasheet's thermal derating curves and electrical specs tables.
Is the MBR745 pin-compatible with other TO-220AC Schottky rectifiers?
Yes, the MBR745 uses the standard TO-220AC outline with anode on pin 1 and cathode/tab on pin 2 - matching mechanical and electrical pinout of industry-standard 2-terminal TO-220AC rectifiers including STPS745D and MBR745G. Mounting hole spacing, tab dimensions, and terminal pitch align with JEDEC TO-220AC specifications, enabling direct PCB footprint reuse.
Does the MBR745 have a built-in guard ring, and what benefit does it provide?
Yes, the MBR745 incorporates a guard ring structure as stated in its Vishay datasheet. This feature improves edge termination robustness, suppresses premature avalanche breakdown, and enhances long-term reliability under repetitive transient stress - particularly valuable in applications subject to load dump or inductive switching surges where localized junction failure could occur without it.
What is the typical junction capacitance of the MBR745, and how does it affect high-frequency operation?
The MBR745 has a typical junction capacitance (CT) of 400 pF at 5 V reverse bias and 25 °C. This low capacitance minimizes displacement current and switching losses in high-frequency (>100 kHz) converters, supporting clean turn-off behavior and reduced EMI generation - especially beneficial in compact flyback and resonant topologies where diode capacitance directly impacts efficiency and noise.
Can the MBR745 be used in automotive reverse battery protection circuits?
Yes, the MBR745 is suitable for automotive reverse battery protection due to its 45 V VR rating (providing margin above 36 V systems), 690 A IFSM surge capability (withstands ISO 7637-2 load dump pulses), and 150 °C TJ rating for under-hood thermal resilience. Its low VF preserves voltage headroom during cold-crank conditions, and its guard ring ensures reliability across repeated polarity reversals.
MBR745 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 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 @ 45 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -65°C ~ 150°C
MBR745 FAQ
1.How can I place an order for MBR745 through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR745 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 MBR745 reliable?
The price and inventory of MBR745 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR745 is usually 5 days.
3.What payment methods are accepted for MBR745?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR745 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR745?
MBR745 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR745 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 MBR745?
For technical support, including MBR745 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR745 requirements.
6.How does Aetrix verify that MBR745 is sourced from the original manufacturer or authorized distributors?
All MBR745 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 MBR745 meets industry standards.
7.What is the process for return or replacement of MBR745?
All MBR745 units undergo pre-shipment inspection (PSI). If there is an issue with MBR745, 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 MBR745 part is unused and in its original packaging.
Return procedure for MBR745:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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