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Diodes Incorporated B340AX-13
- Part No.:
- B340AX-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
B340AX-13.pdf
- Description:
- DIODE SCHOTTKY 40V 3A SMA TR 5K
- Quantity:
- Payment:
- Shipping:
Inventory:8,669
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Product details
Overview
B340AX-13 from Diodes Incorporated is a 40 V, 3 A trench Schottky barrier rectifier in SMA package, featuring 0.50 V max forward voltage at 3.0 A and 0.2 mA max reverse leakage at 40 V and +25°C, optimized for DC-DC converter freewheeling and reverse polarity protection in compact power supplies.
For engineers reviewing the B340AX-13 datasheet, B340AX-13 pinout, B340AX-13 application, or B340AX-13 equivalent, key selection criteria include low VF for efficiency, high TJ rating (+150°C) for thermal robustness, SMA footprint compatibility, and RoHS/Green compliance for industrial and automotive-adjacent designs.
Technical Context
This Schottky rectifier uses trench MOS structure to reduce forward voltage drop while maintaining soft, fast switching behavior-critical for minimizing switching losses in high-frequency DC-DC converters operating up to several hundred kHz. Its low junction capacitance (≈100 pF at 4 V) supports clean turn-off in synchronous rectification topologies.
The device is rated for continuous operation from –55°C to +150°C junction temperature, with thermal resistance of 30°C/W junction-to-case and 80°C/W junction-to-ambient on standard FR-4 PCB layout, enabling reliable performance under sustained 3 A DC load without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; suitable for 24 V system inputs with margin. |
| IO | 3 A - Average rectified output current at +25°C ambient; derates to ~1.8 A at +100°C case temp. |
| VF (max) | 0.50 V @ 3.0 A, +25°C - Enables <1.5 W conduction loss per diode in 3 A paths, improving efficiency over standard PN diodes. |
| IR (max) | 0.2 mA @ 40 V, +25°C - Low leakage preserves battery life in reverse-polarity protection and blocking applications. |
| TJ Range | –55°C to +150°C - Supports operation in under-hood or enclosed industrial environments without derating. |
| RθJC | 30°C/W - Allows direct thermal path to heatsink or copper pour; enables >2 W dissipation with ≤60°C rise above case. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with cathode band polarity indicator; dimensions: 4.60 mm × 2.92 mm × 2.29 mm (L × W × H); weight ≈ 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side in rectifier/freewheeling configurations; requires adequate copper area for thermal relief. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to output/load/ground; critical for correct polarity in reverse protection circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Reduces VF by ~15% vs planar Schottky counterparts at 3 A, directly lowering conduction loss in high-current paths. |
| Soft, fast switching | Minimizes voltage overshoot and EMI during turn-off-essential for noise-sensitive DC-DC converter outputs. |
| +150°C maximum junction temperature | Permits full 3 A rating in sealed enclosures or high-ambient industrial settings without thermal shutdown. |
| RoHS 3 & Halogen/Antimony-free "Green" | Meets EU 2015/863/EU and automotive supply chain requirements; no bromine/chlorine/antimony restrictions violated. |
Applications
| DC-DC Converter Freewheeling | Reverse Polarity Protection |
|---|---|
Use Scenario: Used as low-loss freewheeling diode in buck converter output stage, handling 3 A continuous flyback current. IC Role / Device Role / Timing Role: Passive unidirectional current path enabling energy recovery during high-side switch off-time. Use Value: 0.50 V VF limits conduction loss to ≤1.5 W, improving converter efficiency by 2–3% vs standard PN diodes. | Use Scenario: Placed in series with VIN to block reverse-connected power sources in 12–24 V embedded systems. IC Role / Device Role / Timing Role: Unidirectional blocking element preventing damage during accidental battery reversal. Use Value: 0.2 mA IR at +25°C ensures negligible standby drain, preserving battery charge over months of storage. |
| SMPS Output Rectification | Blocking Diode in Solar Charge Controller |
Use Scenario: Secondary-side rectifier in offline AC-DC adapter delivering 5–12 V at up to 3 A. IC Role / Device Role / Timing Role: Converts transformer AC output to regulated DC; operates at 50–100 kHz switching frequency. Use Value: Trench design sustains low VF across temperature, maintaining stable output regulation under varying load and ambient conditions. | Use Scenario: Prevents nighttime battery discharge through solar panel in 24 V photovoltaic systems. IC Role / Device Role / Timing Role: Standby-blocking diode placed between panel and battery terminals. Use Value: +150°C rating allows outdoor mounting near panels without thermal derating; 40 V VRRM covers open-circuit panel voltage spikes. |
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 40 V / 3 A rating, but planar Schottky; VF = 0.55 V max @ 3 A - 10% higher conduction loss. | Lacks trench architecture; slightly slower recovery and higher capacitance (≈120 pF). | Acceptable where cost sensitivity outweighs 0.05 V VF advantage and thermal margin is ample. |
| MBR340 (ON Semiconductor) | Identical 40 V / 3 A specs; VF = 0.52 V max @ 3 A; RθJA = 85°C/W - 6% higher thermal resistance. | Same SMA package; slightly lower thermal performance limits sustained 3 A operation in confined layouts. | Valid alternative if existing BOM uses ON Semi sourcing; verify board-level thermal margin before substitution. |
Compared with SS34 and MBR340, the B340AX-13 delivers the lowest VF and best thermal resistance in its class, making it preferred for space-constrained, thermally demanding DC-DC and battery-protection designs where every millivolt and degree matters.
Availability
B340AX-13 is available at Aetrix Electronics and suitable for DC-DC converters, reverse polarity protection circuits, SMPS output stages, and solar charge controllers requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.
Supply support for B340AX-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-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The B340AX belongs to Diodes' Trench Schottky Rectifier product line, engineered specifically for high-frequency, low-VF power conversion in space- and thermally-constrained applications such as portable power adapters and automotive body electronics.
FAQ
What is the maximum surge current rating for B340AX-13?
The B340AX-13 has a non-repetitive peak forward surge current (IFSM) rating of 65 A for a 1 ms single half-sine wave at rated load. This withstands typical inrush and transient events in DC-DC and SMPS applications without degradation, provided the surge duty cycle remains below 0.1%.
Can B340AX-13 be used in automotive applications?
The B340AX-13 is not AEC-Q101 qualified, but Diodes offers automotive-grade variants (e.g., B340A-13) with PPAP documentation and IATF 16949 manufacturing. For non-safety-critical automotive subsystems like infotainment power rails, B340AX-13 may be used with customer validation of thermal and lifetime performance.
How does the SMA package affect thermal performance?
The SMA package provides a junction-to-case thermal resistance of 30°C/W, enabling efficient heat transfer to PCB copper when mounted on ≥0.2" × 0.25" 2 oz copper pads. Its small footprint saves board space but requires careful layout-thermal vias and ground-plane connection are recommended for sustained 3 A operation above +85°C ambient.
Is B340AX-13 compatible with lead-free reflow processes?
Yes-B340AX-13 features matte tin lead-free plating and is rated for standard Pb-free reflow profiles (peak 260°C, 60 sec max). It meets MIL-STD-202, Method 208 solderability requirements and has J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to assembly.
B340AX-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- 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:
- SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
B340AX-13 FAQ
1.How can I place an order for B340AX-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B340AX-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 B340AX-13 reliable?
The price and inventory of B340AX-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B340AX-13 is usually 5 days.
3.What payment methods are accepted for B340AX-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B340AX-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B340AX-13?
B340AX-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B340AX-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 B340AX-13?
For technical support, including B340AX-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B340AX-13 requirements.
6.How does Aetrix verify that B340AX-13 is sourced from the original manufacturer or authorized distributors?
All B340AX-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 B340AX-13 meets industry standards.
7.What is the process for return or replacement of B340AX-13?
All B340AX-13 units undergo pre-shipment inspection (PSI). If there is an issue with B340AX-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 B340AX-13 part is unused and in its original packaging.
Return procedure for B340AX-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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