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Diodes Incorporated SBR3A40SAF-13
- Part No.:
- SBR3A40SAF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SBR3A40SAF-13.pdf
- Description:
- DIODE SBR 40V 3A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:53,057
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Product details
Overview
SBR3A40SAF-13 from Diodes Incorporated is a 40 V, 3 A surface-mount Super Barrier Rectifier in SMAF package, featuring 0.53 V max forward voltage at 3 A and 0.4 mA max reverse leakage at 40 V/25°C, designed for high-efficiency DC-DC boost stages and recirculating paths in power converters.
For engineers reviewing the SBR3A40SAF-13 datasheet, SBR3A40SAF-13 pinout, SBR3A40SAF-13 application, or SBR3A40SAF-13 equivalent, key selection criteria include VF stability up to +150°C, 50 A non-repetitive surge rating, AEC-Q101 qualification, and low-profile SMAF thermal performance in space-constrained industrial and automotive power supplies.
Technical Context
This Super Barrier Rectifier uses patented SBR technology to deliver avalanche capability five times higher than standard Schottky diodes while maintaining low VF (0.46 V typ at 3 A, 25°C) and superior high-temperature IR stability (80 mA max at 125°C). Its unidirectional conduction supports DC blocking and freewheeling functions in switching topologies.
The device operates across –65°C to +150°C with RθJA = 85°C/W on FR-4 PCB and RθJC = 15°C/W, enabling reliable thermal management in compact layouts. It is rated for 40 V peak repetitive reverse voltage and derated to 2.4 A at +125°C ambient per Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum allowable repetitive reverse voltage without breakdown |
| IO(AV) | 3.0 A - Continuous average forward current at TA = +25°C |
| VF(max) | 0.53 V - Max forward drop at IF = 3.0 A, TJ = +25°C; limits conduction loss |
| IR(max) | 0.4 mA - Max reverse leakage at VR = 40 V, TJ = +25°C; ensures low standby loss |
| IFSM | 50 A - Non-repetitive surge current (8.3 ms half-sine); withstands startup transients |
| TJ Range | –65°C to +150°C - Full operating junction temperature range; qualified per AEC-Q101 |
| RθJA | 85°C/W - Thermal resistance from junction to ambient on standard FR-4 board |
Pinout & Package
Package: SMAF - Low-profile surface-mount plastic package (4.00 mm × 2.50 mm × 1.70 mm), UL 94V-0 rated, matte tin-plated copper leadframe, cathode band polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side of rectification path; accepts up to 3 A continuous |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to output/load; blocks 40 V reverse bias with <0.4 mA leakage at 25°C |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche ruggedness | 5× higher than Schottky diodes - Enables robust operation under inductive switching stress |
| High-temp IR stability | 80 mA max at 125°C - Maintains low standby power in hot environments |
| Low VF conduction loss | 0.46 V typ at 3 A/25°C - Reduces I²R loss and improves converter efficiency |
| AEC-Q101 qualification | Qualified for automotive-grade reliability - Validated for under-hood and engine-control applications |
| Green construction | Halogen- and antimony-free, RoHS-compliant - Meets EU environmental compliance requirements |
Applications
| Boost Diode | Blocking Diode |
|---|---|
Use Scenario: Used in DC-DC boost converters to transfer energy from input to output capacitor during switch-off phase. IC Role / Device Role: Unidirectional current path enabling voltage step-up; handles 3 A average and 50 A surge currents. Use Value: Low 0.53 V VF minimizes power loss during conduction, improving overall conversion efficiency above 90%. | Use Scenario: Placed between battery and system rail to prevent backfeed during standby or fault conditions. IC Role / Device Role: Reverse-polarity and back-power protection element; blocks 40 V with <0.4 mA leakage at room temp. Use Value: Stable IR up to 125°C ensures reliable isolation in thermally aggressive battery management systems. |
| Recirculating Diode | Freewheeling Diode |
Use Scenario: Installed across inductive loads (e.g., solenoids, relays) to clamp flyback voltage during de-energization. IC Role / Device Role: Energy recirculation path; absorbs stored magnetic energy as heat with 50 A surge tolerance. Use Value: High avalanche capability prevents failure during repeated inductive turn-off events in automotive actuators. | Use Scenario: Integrated into buck or flyback secondary-side rectification to sustain current flow when main switch is off. IC Role / Device Role: Secondary-side unidirectional conduction element; operates continuously at 3 A with minimal thermal rise. Use Value: RθJA = 85°C/W enables stable operation on compact PCBs without heatsinking in space-limited adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super barrier rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SBRT3A40SAF-13 | Same electrical specs; enhanced surge robustness via revised SBR process | Identical footprint and function; preferred for new designs requiring extended surge margin | Select when designing for >50 A surge immunity or extended lifetime under repetitive transient stress |
| SS34-HF | Higher VF (0.55 V max), lower IR (0.2 mA max), no AEC-Q101 qualification | General-purpose Schottky; not rated for automotive or high-reliability industrial use | Acceptable only for cost-sensitive consumer applications below 85°C ambient |
Compared with SBRT3A40SAF-13, the SBR3A40SAF-13 offers proven AEC-Q101 reliability but slightly lower surge margin; versus SS34-HF, it delivers superior high-temperature stability and automotive qualification at modest VF trade-off.
Availability
SBR3A40SAF-13 is available at Aetrix Electronics and suitable for boost diode, blocking diode, and recirculating diode applications requiring stable component supply, AEC-Q101 compliance, and low-profile SMAF packaging.
Supply support for SBR3A40SAF-13 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, specializing in high-performance power management, signal integrity, and protection solutions.
The SBR® Super Barrier Rectifier product line targets high-efficiency, high-reliability power conversion in automotive, industrial, and computing applications where Schottky limitations in leakage and ruggedness are critical.
FAQ
What is the maximum junction temperature for continuous operation?
The SBR3A40SAF-13 has a rated junction temperature range of –65°C to +150°C. Continuous operation at +150°C is permitted provided thermal design maintains TJ ≤ +150°C using the specified RθJA = 85°C/W on FR-4 and appropriate PCB copper area.
Is this diode suitable for automotive applications?
Yes - the SBR3A40SAF-13 is qualified to AEC-Q101 standards and rated for operation from –65°C to +150°C, making it suitable for under-hood and engine-control module applications where high reliability and thermal stability are required.
How does its reverse leakage compare to standard Schottky diodes at elevated temperature?
At +125°C and 40 V reverse bias, SBR3A40SAF-13 exhibits ≤80 mA IR - significantly lower than typical Schottky diodes (often >200 mA), due to patented SBR structure that suppresses thermally generated carriers.
What is the recommended PCB pad layout?
The manufacturer specifies a suggested pad layout per AP02001 (available at diodes.com/datasheets/ap02001.pdf), with 0.1" × 0.15" copper pads on FR-4 to achieve the published RθJA = 85°C/W and ensure mechanical reliability during reflow soldering.
SBR3A40SAF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- SBR®
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Super Barrier
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 530 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 400 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -65°C ~ 150°C
SBR3A40SAF-13 FAQ
1.How can I place an order for SBR3A40SAF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SBR3A40SAF-13 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 SBR3A40SAF-13 reliable?
The price and inventory of SBR3A40SAF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBR3A40SAF-13 is usually 5 days.
3.What payment methods are accepted for SBR3A40SAF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBR3A40SAF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBR3A40SAF-13?
SBR3A40SAF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBR3A40SAF-13 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 SBR3A40SAF-13?
For technical support, including SBR3A40SAF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBR3A40SAF-13 requirements.
6.How does Aetrix verify that SBR3A40SAF-13 is sourced from the original manufacturer or authorized distributors?
All SBR3A40SAF-13 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 SBR3A40SAF-13 meets industry standards.
7.What is the process for return or replacement of SBR3A40SAF-13?
All SBR3A40SAF-13 units undergo pre-shipment inspection (PSI). If there is an issue with SBR3A40SAF-13, 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 SBR3A40SAF-13 part is unused and in its original packaging.
Return procedure for SBR3A40SAF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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