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onsemi MBR4045PT
- Part No.:
- MBR4045PT
- Manufacturer:
- onsemi
- Category:
- Diode Arrays
- Package:
- TO-247-3
- Datasheet:
-
MBR4045PT.pdf
- Description:
- DIODE ARR SCHOTT 45V 20A TO247AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,184
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Product details
Overview
MBR4045PT from Diodes Incorporated is a 40A, 45V Schottky barrier rectifier in TO-3P package, featuring low forward voltage drop (0.70 V @ 20A, 25°C), high surge capability (400 A, 8.3 ms), and thermal resistance of 1.4 °C/W - used for polarity protection and free-wheeling in DC-DC converters and industrial power supplies.
For engineers reviewing the MBR4045PT datasheet, MBR4045PT pinout, MBR4045PT application, or MBR4045PT equivalent, key selection criteria include peak reverse voltage (45 V), average output current (40 A @ TC = 125°C), forward voltage at operating temperature, junction-to-case thermal resistance, and RoHS-compliant tin-plated leads for lead-free assembly.
Technical Context
This device employs Schottky barrier chip construction with integrated guard ring for transient protection, enabling fast switching and minimal reverse recovery loss. It is rated for single-phase, half-wave 60 Hz operation with resistive or inductive loads, and requires 20% current derating under capacitive load conditions.
Thermal performance is defined with heatsink mounting per Note 1; typical junction capacitance is 1100 pF at 1 MHz and 4.0 V reverse bias. The device operates across –65°C to +150°C and supports dV/dt up to 10,000 V/s without spurious turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - maximum repetitive reverse voltage before breakdown; sets safe operating limit in polarity protection circuits |
| IO @ TC = 125°C | 40 A - continuous average forward current with case temperature held at 125°C using heatsink |
| VFM @ 20A, 25°C | 0.70 V - forward voltage drop determining conduction loss and thermal rise at nominal load |
| IFSM (8.3 ms) | 400 A - non-repetitive surge rating defining short-circuit robustness in motor drive freewheeling |
| RJC | 1.4 °C/W - thermal resistance from junction to case; determines required heatsink size for thermal management |
| IRM @ 125°C | 100 mA - peak reverse leakage at max operating temperature; impacts standby power in high-temp environments |
Pinout & Package
TO-3P package: molded plastic case (UL 94V-0), bright tin-plated leads, polarity marked on body. Mounting requires heatsink contact via case back surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Tab) | Current input terminal | Electrically connected to metal tab; must be electrically isolated from heatsink unless circuit design permits common cathode reference |
| Cathode (Lead) | Current output terminal | Single lead exiting package; carries full 40 A forward current; solderable per MIL-STD-202, Method 208 |
Key Features
| Feature | Design Value |
|---|---|
| Schottky barrier with guard ring | Enables transient immunity without external TVS; reduces system-level clamping component count |
| Low VFM at 125°C | 0.60 V @ 20A ensures <12 W conduction loss at elevated temperature, easing thermal design |
| High IFSM rating | 400 A surge capacity supports reliable operation during inductive kick in relay or solenoid drivers |
| RoHS-compliant finish | Bright tin plating meets EU Directive Annex Notes 5 & 7 exemptions; compatible with lead-free reflow profiles |
Applications
| DC-DC Converter Output Rectification | Industrial Motor Drive Freewheeling |
|---|---|
Use Scenario: High-efficiency 12 V to 5 V/3.3 V buck converter in programmable logic controller (PLC) power stage. IC Role / Device Role / Timing Role: Output rectifier replacing conventional PN diode to minimize conduction loss and improve efficiency above 90%. Use Value: 0.70 V forward drop at 20 A reduces power dissipation by ~0.5 W vs. comparable PN rectifier, lowering heatsink requirements. | Use Scenario: Back-EMF suppression across 24 V DC brushed motor in automated conveyor system. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during PWM switch-off transitions. Use Value: 400 A surge rating withstands repeated inductive spikes without degradation; TO-3P mechanical robustness supports vibration-prone environments. |
| Polarity Protection in Power Inputs | Low-Voltage Inverter Bridge Clamp |
Use Scenario: Reverse-voltage protection at 24 V input of industrial HMI panel with wide ambient temperature range. IC Role / Device Role / Timing Role: Series-connected anode-in configuration blocking reverse current while passing forward load current. Use Value: 45 V VRRM provides 10 V margin over 24 V nominal rail; –65°C to +150°C rating ensures reliability in uncontrolled enclosures. | Use Scenario: Clamp diode in half-bridge inverter driving 48 V BLDC fan in HVAC control unit. IC Role / Device Role / Timing Role: Fast-recovery clamp limiting voltage overshoot during switching transitions in low-inductance layout. Use Value: 1100 pF junction capacitance minimizes displacement current during dV/dt events; 10,000 V/s rating prevents false triggering. |
Availability
MBR4045PT is available at Aetrix Electronics and suitable for DC-DC converter output rectification, industrial motor drive freewheeling, and polarity protection applications requiring stable component supply despite its obsolete status.
Supply support for MBR4045PT 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, manufacturing, and sales operations across Asia, Europe, and the Americas.
The MBR40xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in industrial and computing power supplies.
FAQ
Is MBR4045PT still in production?
No, MBR4045PT is officially discontinued and marked obsolete per Diodes Incorporated's DS23019 Rev. 9-4 (July 2015). It is no longer manufactured, but limited legacy stock may be available through authorized distributors and Aetrix Electronics' extended-life inventory program.
What is the correct mounting orientation for thermal performance?
The metal tab (anode) must be mounted directly to a heatsink with thermally conductive interface material. Electrical isolation is required unless the circuit design intentionally references the anode to heatsink potential. Mechanical data specify tab flatness and torque limits per Diodes' AP02008 packaging guide.
Can MBR4045PT replace MBR4040PT in existing designs?
Yes, MBR4045PT is a direct upgrade from MBR4040PT with identical package, pinout, and thermal characteristics, offering higher VRRM (45 V vs. 40 V) and same 40 A IO rating - suitable where additional reverse voltage margin is needed without layout change.
Does this part meet automotive AEC-Q101 requirements?
No, MBR4045PT is not AEC-Q101 qualified. It is specified for industrial and commercial applications only. Diodes Incorporated does not list it in their AEC-Q101 product catalog, and the datasheet contains no stress test data or qualification reports per AEC standards.
MBR4045PT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SWITCHMODE™
- Package/Case:
- TO-247-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 700 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 45 V
- Operating Temperature - Junction:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-247AD (TO-3P)
MBR4045PT FAQ
1.How can I place an order for MBR4045PT through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR4045PT 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 MBR4045PT reliable?
The price and inventory of MBR4045PT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR4045PT is usually 5 days.
3.What payment methods are accepted for MBR4045PT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR4045PT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR4045PT?
MBR4045PT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR4045PT 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 MBR4045PT?
For technical support, including MBR4045PT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR4045PT requirements.
6.How does Aetrix verify that MBR4045PT is sourced from the original manufacturer or authorized distributors?
All MBR4045PT 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 MBR4045PT meets industry standards.
7.What is the process for return or replacement of MBR4045PT?
All MBR4045PT units undergo pre-shipment inspection (PSI). If there is an issue with MBR4045PT, 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 MBR4045PT part is unused and in its original packaging.
Return procedure for MBR4045PT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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