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Vishay General Semiconductor - Diodes Division MBR745HE3/45
- Part No.:
- MBR745HE3/45
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
MBR745HE3/45.pdf
- Description:
- DIODE SCHOTTKY 45V 7.5A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,011
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Product details
Overview
MBR745HE3/45 from Vishay General Semiconductor is a 45 V, 7.5 A average forward current Schottky barrier rectifier in TO-220AC package, featuring 0.57 V forward voltage at 7.5 A and 125 °C junction temperature, 150 A peak surge capability, and guardring-enhanced overvoltage protection-designed for high-efficiency DC/DC converters and switching power supply freewheeling paths.
For engineers reviewing the MBR745HE3/45 datasheet, MBR745HE3/45 pinout, MBR745HE3/45 application, or MBR745HE3/45 equivalent, key selection criteria include low VF at elevated temperature, TO-220AC thermal resistance (3.0 °C/W), reverse leakage at 125 °C (15 mA), and compatibility with 275 °C solder bath per JESD 22-B106.
Technical Context
This device implements a single-die Schottky junction with integrated guardring structure to suppress edge breakdown under transient overvoltage conditions. Its low barrier height enables 0.57 V VF at 7.5 A/125 °C while maintaining 45 V VRRM rating and 10,000 V/μs dV/dt capability.
The TO-220AC package provides direct metal-to-heatsink thermal path with RθJC = 3.0 °C/W, supporting continuous 7.5 A operation up to 110 °C case temperature per derating curve. Junction temperature is rated to +150 °C, with storage extended to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - maximum repetitive reverse blocking voltage; defines safe operating limit in DC/DC converter output stage |
| IF(AV) | 7.5 A - average forward current at TC = 25 °C; derates linearly above 25 °C case temp |
| VF @ 7.5 A, 125 °C | 0.57 V - low conduction loss enabling >92 % efficiency in 5–12 V output SMPS |
| IFSM | 150 A - non-repetitive surge rating for startup/inrush tolerance in power supplies |
| RθJC | 3.0 °C/W - thermal resistance from junction to case; enables heatsink sizing for 7.5 A continuous operation |
| IR @ 45 V, 125 °C | 15 mA - reverse leakage at max junction temp; impacts standby power in polarity protection circuits |
| TJ max. | +150 °C - maximum junction temperature; sets reliability boundary for high-ambient industrial use |
Pinout & Package
TO-220AC package: isolated mounting tab (Pin 2), anode (Pin 1), cathode connected to tab. Designed for vertical heatsink mounting with ≤10 in-lbs torque.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Input terminal for forward conduction; connects to switching node or input rail in freewheeling configuration |
| Pin 2 (Tab) | Cathode / Thermal Path | Electrically and thermally common cathode connection; must be electrically isolated from heatsink unless circuit design requires cathode grounding |
Key Features
| Feature | Design Value |
|---|---|
| Guardring overvoltage protection | Suppresses edge avalanche, enabling stable 45 V blocking without premature breakdown under transient stress |
| Low VF at high temperature | 0.57 V @ 7.5 A/125 °C reduces conduction loss by ~35 % vs. comparable Si diodes at same condition |
| High surge capability | 150 A IFSM supports robustness against inductive kickback in motor drive flyback paths |
| 275 °C solder bath rating | Enables compatibility with lead-free reflow and wave soldering processes per JESD 22-B106 |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker test; suitable for commercial-grade long-life deployments |
Applications
| Switching Mode Power Supply Output Rectification | DC/DC Converter Freewheeling Diode |
|---|---|
Use Scenario: Secondary-side rectification in 5–12 V, 50–200 W offline SMPS with synchronous or asynchronous topology. IC Role / Device Role / Timing Role: Unidirectional current path during low-side switch off-time; clamps transformer leakage energy. Use Value: 0.57 V VF at 125 °C minimizes conduction loss, improving full-load efficiency by ≥1.2 % versus standard Schottkys. | Use Scenario: Freewheeling path in buck or flyback converters powering FPGA core rails or telecom modules. IC Role / Device Role / Timing Role: Provides low-loss return path for inductor current during high-side switch off-phase. Use Value: 150 A IFSM withstands peak inductor current surges during load transients without degradation. |
| Polarity Protection Circuit | Reverse Battery Protection in Automotive ECUs |
Use Scenario: Series-connected input protection for industrial PLC I/O modules operating from 24 V DC rails. IC Role / Device Role / Timing Role: Blocks reverse polarity connection while conducting forward current with minimal drop. Use Value: 0.57 V VF ensures <1.4 W power dissipation at 7.5 A, eliminating need for active MOSFET solutions. | Use Scenario: Reverse battery protection in 12 V automotive control units exposed to -14 V jump-start transients. IC Role / Device Role / Timing Role: Anode-to-battery, cathode-to-system; blocks reverse voltage while passing normal load current. Use Value: Guardring structure sustains 45 V reverse bias during cold-crank events without edge breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STPS745B | Same 45 V VRRM, 7.5 A IF(AV), but VF = 0.62 V @ 7.5 A/125 °C; RθJC = 3.5 °C/W | Slightly higher conduction loss and thermal resistance; less efficient in high-ambient-density layouts | Select when STMicroelectronics sourcing preference applies and 50 mV VF penalty is acceptable |
| SS7P4 | 45 V VRRM, 7 A IF(AV); VF = 0.55 V @ 7 A/125 °C; TO-277 package (surface-mount) | Lower current rating and SMD-only footprint; unsuitable for through-hole heatsinked designs | Choose only for space-constrained PCBs where 0.5 A derating and no mechanical mounting are acceptable |
Compared with STPS745B and SS7P4, the MBR745HE3/45 delivers the lowest VF at full-rated current and highest thermal conductivity in through-hole form, making it optimal for thermally demanding 7.5 A freewheeling and SMPS rectification roles.
Availability
MBR745HE3/45 is available at Aetrix Electronics and suitable for switching mode power supplies, DC/DC converters, and polarity protection circuits requiring stable component supply across industrial, telecom, and automotive electronics programs.
Supply support for MBR745HE3/45 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 General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on high-reliability, high-efficiency power components.
The MBR7xx series targets high-frequency, high-efficiency power conversion systems, delivering optimized Schottky performance for cost-sensitive yet thermally demanding applications like server PSUs and industrial DC/DC modules.
FAQ
What is the maximum junction temperature rating for MBR745HE3/45?
The MBR745HE3/45 has a maximum junction temperature (TJ max.) of +150 °C, validated per Vishay's thermal characterization and supported by its TO-220AC package with 3.0 °C/W junction-to-case thermal resistance. This allows reliable operation in industrial environments where ambient temperatures exceed 85 °C, provided heatsinking maintains case temperature within derating limits shown in Figure 1 of the datasheet. The MBR745HE3/45 must not be operated beyond this TJ limit to ensure long-term parametric stability.
Is MBR745HE3/45 RoHS-compliant and qualified for lead-free soldering?
Yes, the MBR745HE3/45 carries the E3 suffix indicating RoHS compliance and qualification per JESD 201 Class 1A whisker testing. It is rated for solder bath temperatures up to 275 °C for 10 seconds per JESD 22-B106, making it compatible with standard lead-free wave and selective soldering processes. The matte tin-plated leads meet J-STD-002 solderability requirements, and the molding compound complies with UL 94 V-0 flammability standards. The MBR745HE3/45 is fully suitable for modern RoHS-compliant manufacturing lines.
How does the guardring feature improve reliability in MBR745HE3/45?
The guardring in the MBR745HE3/45 is a diffusion-engineered region surrounding the main Schottky junction that equalizes electric field distribution at the silicon periphery. This prevents premature edge breakdown under transient overvoltage conditions-such as load dump or inductive switching spikes-thereby enhancing ruggedness without sacrificing forward conduction performance. In practice, this allows the MBR745HE3/45 to sustain rated 45 V reverse voltage even during fast dV/dt events up to 10,000 V/μs, unlike non-guardring Schottkys which may exhibit early leakage or failure. The MBR745HE3/45 leverages this for automotive and industrial applications with harsh electrical environments.
What is the reverse leakage current of MBR745HE3/45 at elevated temperature?
At rated 45 V reverse voltage and 125 °C junction temperature, the MBR745HE3/45 exhibits a maximum reverse current (IR) of 15 mA, as specified in the Electrical Characteristics table. This value is critical for standby power budgeting in polarity protection and OR-ing applications, where leakage directly contributes to quiescent loss. At 25 °C, IR is limited to 0.1 mA-demonstrating strong thermal stability. Designers using the MBR745HE3/45 should verify system-level standby current with this 15 mA worst-case figure at max operating temperature.
Can MBR745HE3/45 replace MBR760HE3/45 in a 45 V design?
No-MBR745HE3/45 and MBR760HE3/45 are distinct variants: the former is rated for 45 V VRRM, the latter for 60 V. While both share identical package, current rating (7.5 A), and thermal specs, substituting MBR745HE3/45 in a design originally specifying MBR760HE3/45 risks reverse breakdown if system transients exceed 45 V. The MBR745HE3/45 is not a drop-in replacement for MBR760HE3/45. Use MBR745HE3/45 only where the maximum applied reverse voltage remains ≤45 V with adequate margin, as confirmed by worst-case analysis of the specific circuit.
MBR745HE3/45 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 ~ 175°C
MBR745HE3/45 FAQ
1.How can I place an order for MBR745HE3/45 through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR745HE3/45 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 MBR745HE3/45 reliable?
The price and inventory of MBR745HE3/45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR745HE3/45 is usually 5 days.
3.What payment methods are accepted for MBR745HE3/45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR745HE3/45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR745HE3/45?
MBR745HE3/45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR745HE3/45 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 MBR745HE3/45?
For technical support, including MBR745HE3/45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR745HE3/45 requirements.
6.How does Aetrix verify that MBR745HE3/45 is sourced from the original manufacturer or authorized distributors?
All MBR745HE3/45 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 MBR745HE3/45 meets industry standards.
7.What is the process for return or replacement of MBR745HE3/45?
All MBR745HE3/45 units undergo pre-shipment inspection (PSI). If there is an issue with MBR745HE3/45, 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 MBR745HE3/45 part is unused and in its original packaging.
Return procedure for MBR745HE3/45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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