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SMC Diode Solutions MBR1645
- Part No.:
- MBR1645
- Manufacturer:
- SMC Diode Solutions
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
MBR1645.pdf
- Description:
- DIODE SCHOTTKY 45V 16A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,813
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Product details
Overview
MBR1645 from Diodes Incorporated is a 16A, 45V Schottky barrier rectifier in TO-220AC package, featuring low forward voltage drop (0.63 V @ 16A, 25°C), high surge capability (150 A, 8.3 ms), and thermal resistance of 1.5°C/W junction-to-case. It is used for polarity protection and free-wheeling in DC-DC converters and low-voltage inverters.
For engineers reviewing the MBR1645 datasheet, MBR1645 pinout, MBR1645 application, or MBR1645 equivalent, key selection criteria include forward voltage at rated current, peak repetitive reverse voltage, surge current rating, thermal resistance, and RoHS-compliant lead-free termination.
Technical Context
This device employs a Schottky barrier chip with guard ring die construction to enhance transient robustness and reduce leakage under high-temperature bias. Its low VF and fast recovery enable high-efficiency operation in switching power supplies operating up to several hundred kHz.
The TO-220AC package provides direct heatsink mounting capability, supporting continuous 16A output at TC = 125°C with appropriate thermal management. Capacitance is specified at 450 pF (1 MHz, 4 V reverse), suitable for high-frequency rectification without excessive ringing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum peak repetitive reverse voltage; defines safe blocking range in polarity protection circuits. |
| IO @ TC=125°C | 16 A - Average rectified output current with case temperature held at 125°C; requires heatsink for sustained operation. |
| VFM @ 16A, 25°C | 0.63 V - Forward voltage drop at full rated current; directly determines conduction loss and thermal load. |
| IFSM (8.3 ms) | 150 A - Non-repetitive surge current rating; supports inrush and fault-current handling in motor drives. |
| RθJC | 1.5 °C/W - Junction-to-case thermal resistance; enables calculation of junction temperature rise under known power dissipation. |
| IRM @ 125°C | 40 mA - Peak reverse leakage at max operating temperature; impacts standby power in battery-backed systems. |
Pinout & Package
TO-220AC package with 2-pin configuration: anode and cathode terminals mounted on isolated tab. Mounting hole centered on metal tab for mechanical stability and thermal transfer to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input current entry point | Connected to source-side of rectification path; must withstand full surge current and reverse voltage stress. |
| Cathode (Pin 2) | Output current exit point | Common node for load return; electrically tied to metal tab-requires isolation when mounted to grounded heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| Schottky barrier + guard ring die | Reduces reverse leakage drift at high temperature and improves ESD/TVS-like transient immunity without external components. |
| Low VF at 16A (0.63 V) | Minimizes conduction loss to ~10 W at full load, reducing heatsink size and system cooling requirements. |
| 150 A non-repetitive surge rating | Supports reliable operation during motor startup, capacitor charging, and short-circuit events in industrial power supplies. |
| RoHS-compliant bright tin plating | Ensures solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow profiles. |
Applications
| DC-DC Converter Output Rectification | Automotive Battery Polarity Protection |
|---|---|
Use Scenario: Secondary-side synchronous or Schottky rectification in 12 V/24 V isolated DC-DC modules for telecom and industrial equipment. IC Role / Device Role / Timing Role: Unidirectional current path with minimal forward loss and zero recovery time; replaces slower diodes to improve efficiency. Use Value: 0.63 V VF reduces conduction loss by >30% vs. standard silicon rectifiers, enabling higher power density at 100–500 kHz switching frequencies. | Use Scenario: Reverse-polarity protection circuit placed between vehicle battery and electronic control unit (ECU) input. IC Role / Device Role / Timing Role: Anode-to-battery, cathode-to-load; blocks reverse current while conducting forward current with low insertion loss. Use Value: 0.63 V drop ensures <0.76 W loss at 12 A, avoiding thermal shutdown during cold-cranking conditions where voltage dips to 6 V. |
| Free-Wheeling Diode in Motor Drives | Low-Voltage Inverter Output Stage |
Use Scenario: Freewheeling path across brushed DC motor windings or relay coils in factory automation controllers. IC Role / Device Role / Timing Role: Provides low-loss recirculation path for inductive kickback energy during PWM turn-off. Use Value: 150 A IFSM rating handles repeated 10–20 ms inductive surges without degradation, extending system reliability over 10⁶ cycles. | Use Scenario: Output rectification stage in 24 V solar microinverters or UPS inverters converting DC to 50/60 Hz AC. IC Role / Device Role / Timing Role: Half-wave rectifier in transformerless inverter topologies requiring low-loss, high-current unidirectional conduction. Use Value: 45 V VRRM safely blocks 31.5 V RMS reverse voltage, meeting IEC 62109 insulation coordination requirements for Class II inverters. |
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-MBR1645CT | TO-220AB dual common-cathode configuration; 0.65 V VF @ 16A, 25°C; 120 A IFSM. | Requires dual-diode layout; not drop-in for single-anode/cathode PCB footprint. | Select when dual-output or interleaved rectification is needed; verify layout compatibility. |
| ON Semiconductor MBR1645G | Same TO-220AC package; 0.62 V VF @ 16A, 25°C; 160 A IFSM; AEC-Q101 qualified. | Qualified for automotive underhood use; higher surge rating but same thermal profile. | Prefer for automotive-grade designs requiring qualification evidence and extended surge margin. |
Compared with MBR1645, VS-MBR1645CT offers dual-diode integration at the cost of footprint mismatch, while MBR1645G adds AEC-Q101 compliance and +10 A surge headroom-both require validation of thermal interface and PCB copper area against original design.
Availability
MBR1645 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive battery polarity protection, and free-wheeling diode applications requiring stable component supply and long-term industrial availability.
Supply support for MBR1645 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The MBR16xx series belongs to Diodes' high-current Schottky rectifier product line, engineered for efficiency-critical 12–48 V power conversion in industrial, computing, and transportation systems.
FAQ
Is MBR1645 suitable for surface-mount assembly?
No. MBR1645 uses a through-hole TO-220AC package with a metal tab designed for screw-mount heatsinking. It is not compatible with SMT reflow or wave soldering processes. Board-level mounting requires drilled holes, standoff insulators, and mechanical fasteners.
What is the maximum allowable case temperature for continuous 16A operation?
The datasheet specifies IO = 16 A at TC = 125°C. Operation above this temperature requires derating per Figure 1: at TC = 100°C, max IO drops to ~18.5 A; at TC = 80°C, it rises to ~20 A. Thermal design must ensure TC ≤ 125°C under worst-case ambient and airflow conditions.
Does MBR1645 have a built-in thermal shutdown feature?
No. MBR1645 is a passive rectifier with no integrated thermal sensing or protection circuitry. Safe operation depends entirely on external thermal management-proper heatsinking, copper pour area, and airflow-to maintain TJ ≤ 150°C per its storage and operating range specification.
Can MBR1645 replace MBR1640 in an existing design?
Yes, with verification. MBR1645 has identical package, pinout, and thermal characteristics as MBR1640, but offers +5 V higher VRRM (45 V vs. 40 V). This increases reverse-blocking margin without affecting forward performance-confirm system-level reverse voltage transients remain within the new 45 V limit.
MBR1645 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- SMC Diode Solutions
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 16A
- Voltage - Forward (Vf) (Max) @ If:
- 630 mV @ 16 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 45 V
- Capacitance @ Vr, F:
- 1400pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -55°C ~ 150°C
MBR1645 FAQ
1.How can I place an order for MBR1645 through Aetrix?
Please submit a Request for Quotation (RFQ) for MBR1645 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 MBR1645 reliable?
The price and inventory of MBR1645 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MBR1645 is usually 5 days.
3.What payment methods are accepted for MBR1645?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MBR1645 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MBR1645?
MBR1645 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MBR1645 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 MBR1645?
For technical support, including MBR1645 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MBR1645 requirements.
6.How does Aetrix verify that MBR1645 is sourced from the original manufacturer or authorized distributors?
All MBR1645 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 MBR1645 meets industry standards.
7.What is the process for return or replacement of MBR1645?
All MBR1645 units undergo pre-shipment inspection (PSI). If there is an issue with MBR1645, 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 MBR1645 part is unused and in its original packaging.
Return procedure for MBR1645:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MBR1645 Tags
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