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Taiwan Semiconductor Corporation MBR745H
- Part No.:
- MBR745H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
MBR745H.pdf
- Description:
- 7.5A, 45V, PLANAR SCHOTTKY
- Quantity:
- Payment:
- Shipping:
Inventory:3,155
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Product details
Overview
MBR745H from Taiwan Semiconductor is an AEC-Q101-qualified 7.5A, 45V Schottky barrier rectifier in TO-220AC package, featuring low forward voltage (0.57 V at 7.5A/125°C), high surge capability (150 A IFSM), and guard ring overvoltage protection-used in automotive-grade DC/DC converters and SMPS secondary-side rectification.
For engineers reviewing the MBR745H datasheet, MBR745H pinout, MBR745H application, or MBR745H equivalent, key selection criteria include its 45V VRRM rating, 150°C max junction temperature, AEC-Q101 qualification status, thermal resistance (RθJC = 5°C/W), and compatibility with high-efficiency, high-reliability power conversion designs requiring robust surge handling and low conduction loss.
Technical Context
The MBR745H employs a single-die Schottky structure optimized for low VF and fast switching, with no reverse recovery charge (Qrr ≈ 0). Its guard ring design enhances ruggedness against transient overvoltage events common in automotive load-dump conditions.
Thermally, it delivers RθJA = 15°C/W (free-air) and RθJC = 5°C/W (case-to-junction), enabling reliable operation up to 150°C TJ under sustained 7.5A DC forward current when mounted on heatsinked PCBs per JESD201 Class 2 whisker requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 12–24V automotive systems with transient margin. |
| IF(AV) | 7.5 A - Continuous average forward current; supports stable output rectification in 60–100W DC/DC stages. |
| VF @ 7.5A/125°C | 0.57 V - Low conduction loss reduces heat generation and improves system efficiency at elevated temperatures. |
| IFSM (8.3ms) | 150 A - Peak non-repetitive surge current capability; withstands inrush and fault transients without failure. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood environments with minimal derating. |
| RθJC | 5 °C/W - Low junction-to-case thermal resistance; allows efficient heat transfer to heatsink or copper pour. |
| IR @ 45V/125°C | 15 mA - Reverse leakage at rated voltage and high temperature; impacts standby power in always-on modules. |
Pinout & Package
Package: TO-220AC - 3-lead through-hole package with isolated tab (cathode-connected), matte tin-plated leads, UL 94V-0 molding compound, and 0.56 N·m maximum mounting torque.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current terminal | Connected to transformer secondary or switch node; carries full forward current during conduction phase. |
| Cathode | Output current terminal | Connected to output capacitor and load; electrically tied to metal tab for thermal and electrical path integrity. |
| Tab (Case) | Cathode terminal & thermal path | Internally bonded to cathode; must be electrically isolated from chassis unless circuit design requires cathode grounding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power supplies. |
| Guard ring structure | Improves edge termination reliability and prevents premature avalanche breakdown under voltage stress. |
| Low VF at high temperature | 0.57 V at 7.5A/125°C ensures stable efficiency across full automotive temperature range. |
| High IFSM (150 A) | Supports robust operation during cold-crank, jump-start, and load-dump events without parametric shift. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and global environmental compliance requirements for automotive manufacturing. |
Applications
| Automotive DC/DC Converters | Industrial SMPS Secondary Rectification |
|---|---|
Use Scenario: 12V-to-5V/3.3V buck-derived converter in vehicle infotainment head unit. IC Role / Device Role / Timing Role: Output rectifier replacing fast recovery diode to reduce losses and improve thermal margin. Use Value: 0.57 V VF at 125°C lowers conduction loss by ~35% vs. comparable Si FRD, reducing heatsink size and improving startup reliability. | Use Scenario: 48V input, 12V output telecom power supply with synchronous rectification not feasible. IC Role / Device Role / Timing Role: Primary uncontrolled rectifier in secondary-side output stage. Use Value: 150 A IFSM withstands 100 ms overload pulses without degradation, supporting EN 61000-4-5 surge immunity compliance. |
| USB-C PD Adapters | LED Driver Power Stages |
Use Scenario: Compact 65W USB-C PD adapter with high-density planar transformer layout. IC Role / Device Role / Timing Role: Secondary-side freewheeling rectifier in quasi-resonant flyback topology. Use Value: TO-220AC package provides mechanical stability and thermal mass for intermittent high-current bursts during dynamic load steps. | Use Scenario: Constant-current LED driver for commercial lighting with 24V bus input. IC Role / Device Role / Timing Role: Output rectifier in isolated forward converter feeding LED string. Use Value: 15 mA IR at 125°C limits standby dissipation in always-on drivers, extending electrolytic capacitor life. |
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-75SQ045N | Same VRRM (45V), higher IF(AV) = 7.5A, VF = 0.54 V @ 7.5A/125°C; TO-220AC, AEC-Q101 qualified. | Identical automotive qualification level; slightly lower VF improves efficiency margin in thermally constrained layouts. | Select for tighter VF tolerance or when Vishay's qualification documentation is required by OEM. |
| ON Semiconductor MBR745CT | Same VRRM (45V), dual-die configuration (common-cathode), VF = 0.58 V @ 7.5A/125°C; TO-220AB package, not AEC-Q101 qualified. | Lacks automotive qualification; intended for industrial/commercial use only; dual-diode form factor enables half-wave bridge configurations. | Select only for cost-sensitive non-automotive designs where dual-diode topology adds value and qualification is not mandated. |
Compared with MBR745H, VS-75SQ045N offers marginally better conduction efficiency but identical qualification and packaging, while MBR745CT trades AEC-Q101 compliance for dual-diode flexibility and lower cost-making MBR745H the optimal choice for production automotive power supplies requiring validated reliability.
Availability
MBR745H is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS secondary rectification, and USB-C PD adapters requiring stable component supply with guaranteed AEC-Q101 qualification and long-term lifecycle support.
Supply support for MBR745H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.
The MBR7xxH series was designed specifically for high-reliability automotive power conversion, emphasizing AEC-Q101 qualification, thermal robustness, and surge resilience in harsh ambient environments.
FAQ
Is MBR745H AEC-Q101 qualified?
Yes, MBR745H is explicitly AEC-Q101 qualified per the ordering code suffix "H" and confirmed in TSC's official datasheet revision K2103. This qualification covers stress testing for temperature cycling, humidity bias, high-temperature operating life, and mechanical shock-ensuring suitability for automotive under-hood and cabin applications where reliability is critical. The MBR745H qualification report is available upon request for OEM validation.
What is the forward voltage of MBR745H at 7.5A and 125°C?
The forward voltage of MBR745H is 0.57 V at 7.5A and 125°C, as specified in the Electrical Specifications table of the TSC datasheet (Version K2103, Page 2). This value reflects actual measured performance under worst-case thermal conditions and is used for thermal design margining and efficiency calculations in automotive power supplies.
Does MBR745H have a guard ring structure?
Yes, MBR745H incorporates a guard ring for overvoltage protection, as stated in the FEATURES section of the TSC datasheet. This design feature improves edge termination stability and prevents premature avalanche breakdown during transient voltage events such as load dump or ISO 7637-2 pulse 5a, enhancing long-term reliability in automotive systems.
What is the thermal resistance from junction to case (RθJC) for MBR745H?
The junction-to-case thermal resistance (RθJC) of MBR745H is 5°C/W, per the THERMAL PERFORMANCE table in the official datasheet. This value assumes proper mounting with recommended torque (≤0.56 N·m) and thermal interface material between the TO-220AC tab and heatsink, enabling accurate junction temperature estimation in thermal simulations and layout reviews.
Can MBR745H replace MBR745 in existing designs?
Yes, MBR745H is a direct replacement for MBR745 in terms of pinout, package (TO-220AC), and electrical specifications-including identical VRRM (45V), IF(AV) (7.5A), and VF characteristics. The "H" suffix denotes AEC-Q101 qualification; no PCB or schematic changes are needed, though qualification documentation should be updated for automotive programs requiring certified components.
MBR745H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -55°C ~ 150°C
MBR745H FAQ
1.How can I place an order for MBR745H through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR745H 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 MBR745H reliable?
The price and inventory of MBR745H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR745H is usually 5 days.
3.What payment methods are accepted for MBR745H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR745H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR745H?
MBR745H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR745H 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 MBR745H?
For technical support, including MBR745H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR745H requirements.
6.How does Aetrix verify that MBR745H is sourced from the original manufacturer or authorized distributors?
All MBR745H 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 MBR745H meets industry standards.
7.What is the process for return or replacement of MBR745H?
All MBR745H units undergo pre-shipment inspection (PSI). If there is an issue with MBR745H, 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 MBR745H part is unused and in its original packaging.
Return procedure for MBR745H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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