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Diodes Incorporated B340AXF-13
- Part No.:
- B340AXF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA Flat Leads
- Datasheet:
-
B340AXF-13.pdf
- Description:
- DIODE SCHOTT 40V 3A SMAF TR 10K
- Quantity:
- Payment:
- Shipping:
Inventory:9,990
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Product details
Overview
B340AXF-13 from Diodes Incorporated is a 40 V, 3 A trench Schottky barrier rectifier in SMAF package, featuring 0.50 V max forward voltage at 3 A and 0.20 mA max reverse leakage at 40 V and +25°C, optimized for high-frequency DC-DC converters and reverse polarity protection circuits.
For engineers reviewing the B340AXF-13 datasheet, B340AXF-13 pinout, B340AXF-13 application, or B340AXF-13 equivalent, this device delivers low-loss rectification with soft switching behavior, +150°C junction operation, and RoHS-compliant lead-free plating - critical for compact power supplies and automotive-grade embedded systems requiring thermal robustness and low EMI.
Technical Context
This Schottky rectifier uses trench MOS structure to reduce forward voltage drop while maintaining low leakage across temperature. Its 28 °C/W junction-to-case thermal resistance enables efficient heat dissipation on FR-4 PCBs with minimal copper area.
The device exhibits soft reverse recovery (no stored charge), eliminating snubber circuits in flyback and buck topologies. Junction capacitance drops from ~1000 pF at 0 V to ~100 pF at 30 V reverse bias, supporting stable high-frequency switching up to several MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; defines safe blocking range in 12–24 V DC-DC outputs. |
| IO | 3 A - Average rectified current at +25°C ambient; derates to ~1.7 A at +100°C case temperature per Figure 4. |
| VF (max) | 0.50 V @ 3 A, +25°C - Low conduction loss reduces power dissipation by >30% vs. standard PN diodes in same footprint. |
| IR (max) | 0.20 mA @ 40 V, +25°C - Enables low standby power in always-on polarity protection and battery backup paths. |
| TJ Range | −55°C to +150°C - Supports under-hood automotive modules and industrial power supplies without derating. |
| RθJA | 51 °C/W - Measured on 0.4"×0.5", 2 oz single-sided FR-4; guides heatsinking requirements for continuous 2.5 A operation. |
| IFSM | 65 A - Non-repetitive surge rating allows tolerance of brief inrush currents in SMPS startup. |
Pinout & Package
Package: SMAF - surface-mount, molded plastic case (UL 94V-0), 0.036 g weight, cathode band polarity indicator, matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., switch node in buck converter); requires low-inductance trace routing. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to output rail or ground return; cathode band orientation must match PCB silkscreen for automated assembly verification. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Reduces VF by ~0.1 V vs. planar Schottky at 3 A, lowering conduction loss in 12 V input DC-DC stages. |
| Soft, fast switching | No reverse recovery charge (Qrr ≈ 0), eliminating switching spikes and reducing EMI filter component count. |
| +150°C junction rating | Enables operation in sealed enclosures or near heat sources without forced air cooling in industrial motor drives. |
| Halogen & antimony free | Meets IEC 61249-2-21 "Green" standard (<900 ppm Br/Cl, <1000 ppm Sb), supporting eco-design compliance. |
Applications
| DC-DC Converter Output Rectification | Reverse Polarity Protection |
|---|---|
Use Scenario: Secondary-side rectification in 5–24 V input synchronous buck converters operating at 300–1000 kHz. IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing MOSFET sync switch where cost and layout simplicity are prioritized. Use Value: 0.50 V VF minimizes power loss at 3 A load, enabling >92% efficiency in 12 V → 5 V conversion without thermal throttling. | Use Scenario: Input protection for USB-C PD adapters and portable medical devices powered from external 12–24 V supplies. IC Role / Device Role / Timing Role: Series-blocking diode preventing damage from misconnected barrel-jack or reversed battery terminals. Use Value: 0.20 mA IR at +25°C ensures <2.4 µW standby loss, preserving battery life in always-connected systems. |
| Freewheeling Diode in Motor Drivers | Blocking Diode in Solar Charge Controllers |
Use Scenario: Flyback path for brushed DC motor H-bridge outputs during PWM off-time at 20–50 kHz. IC Role / Device Role / Timing Role: Freewheeling path for inductive kickback; operates in discontinuous conduction mode with soft recovery. Use Value: Soft switching eliminates voltage overshoot beyond 40 V rating, avoiding gate driver stress and reducing snubber capacitor size. | Use Scenario: Isolation between photovoltaic panel string and Li-ion battery bank in off-grid solar systems. IC Role / Device Role / Timing Role: Blocking diode preventing nighttime battery discharge through panel junction box wiring. Use Value: 0.20 mA IR at +25°C limits nightly self-discharge to <0.5 mAh/day per panel, extending usable battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS34 (Vishay) | Same SMA package, but planar Schottky; VF = 0.55 V @ 3 A, IR = 0.5 mA @ 40 V. | Higher conduction loss and leakage reduce efficiency in thermally constrained designs. | Select when cost sensitivity outweighs 50 mV VF advantage and 0.3 mA IR penalty. |
| MBR340 (ON Semiconductor) | SMA package, VF = 0.52 V @ 3 A, IR = 0.3 mA @ 40 V, RθJA = 60 °C/W. | Higher thermal resistance limits continuous current to ~2.2 A at +85°C ambient. | Prefer for legacy designs already qualified with MBR340; verify thermal margin in new layouts. |
Compared with SS34 and MBR340, B340AXF-13 offers the lowest VF and IR in SMAF, with superior thermal performance (RθJA = 51 °C/W) - making it optimal for space-constrained, high-efficiency 3 A DC-DC outputs where junction temperature must stay below +125°C.
Availability
B340AXF-13 is available at Aetrix Electronics and suitable for DC-DC converters, reverse polarity protection circuits, freewheeling diode applications, and solar charge controllers requiring stable component supply and long-term manufacturability.
Supply support for B340AXF-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The B340AXF belongs to Diodes' Trench Schottky Rectifier product line, engineered specifically for high-frequency, low-loss power conversion in consumer, industrial, and automotive power supplies.
FAQ
What is the maximum continuous forward current at +100°C ambient?
At +100°C ambient temperature on a standard FR-4 PCB (0.4"×0.5", 2 oz copper), the B340AXF-13 supports approximately 1.7 A continuous forward current, per the derating curve in Figure 4 of DS43691 Rev. 2–2. This assumes no additional heatsinking and natural convection cooling.
Does B340AXF-13 have a specified reverse recovery time (trr)?
No - as a Schottky barrier rectifier, B340AXF-13 has no minority-carrier storage and therefore no defined reverse recovery time. Its switching is governed by junction capacitance discharge only, resulting in inherently soft, fast turn-off behavior with negligible switching loss.
Is B340AXF-13 qualified to AEC-Q101 for automotive use?
No - the B340AXF-13 is rated for commercial temperature range (−55°C to +150°C) and is not AEC-Q101 qualified. For automotive applications, Diodes offers the B340A-13W variant, which is AEC-Q101 qualified and PPAP-capable.
What is the recommended PCB pad layout for SMAF package?
Diodes specifies a suggested pad layout for SMAF in its package outline document (available at diodes.com/package-outlines.html). Key dimensions include 2.50 mm pad width (X), 6.50 mm pad length (X1), and 1.70 mm spacing (Y); thermal relief vias under the cathode pad improve solder joint reliability and thermal transfer.
B340AXF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B340AXF-13 FAQ
1.How can I place an order for B340AXF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B340AXF-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 B340AXF-13 reliable?
The price and inventory of B340AXF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B340AXF-13 is usually 5 days.
3.What payment methods are accepted for B340AXF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B340AXF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B340AXF-13?
B340AXF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B340AXF-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 B340AXF-13?
For technical support, including B340AXF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B340AXF-13 requirements.
6.How does Aetrix verify that B340AXF-13 is sourced from the original manufacturer or authorized distributors?
All B340AXF-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 B340AXF-13 meets industry standards.
7.What is the process for return or replacement of B340AXF-13?
All B340AXF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B340AXF-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 B340AXF-13 part is unused and in its original packaging.
Return procedure for B340AXF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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