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Diodes Incorporated B340LA-13-F
- Part No.:
- B340LA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
B340LA-13-F.pdf
- Description:
- DIODE SCHOTTKY 40V 3A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:41,898
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Product details
Overview
B340LA-13-F from Diodes Incorporated is a 3.0A, 40V low-forward-voltage Schottky barrier rectifier in SMA package, featuring VF ≤ 0.35 V at IF = 3.0 A, 70 A non-repetitive surge rating, and RoHS-compliant lead-free plating. It serves as a high-efficiency output rectifier in DC/DC converters and AC/DC secondary-side applications.
For engineers reviewing the B340LA-13-F datasheet, B340LA-13-F pinout, B340LA-13-F application, or B340LA-13-F equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (RθJT = 35 °C/W), reverse leakage at 40 V, surge capability, and SMA package compatibility with automated SMT assembly.
Technical Context
This discrete Schottky diode uses guard ring die construction to enhance transient robustness and suppress avalanche-induced failure. Its low VF enables reduced conduction loss in high-frequency switching power supplies operating up to 150 °C junction temperature.
The device exhibits typical CT = 180 pF at VR = 4.0 V and shows minimal VF increase across -55 °C to +150 °C, supporting stable performance in automotive and industrial ambient environments where thermal cycling is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets safe blocking margin for 36 V nominal bus designs |
| IO (AV) | 3.0 A - Average forward current at TA = 90 °C on FR-4 PCB; defines continuous power delivery capability |
| VF @ 3.0 A | ≤ 0.45 V - Measured forward voltage at full rated current; directly determines conduction loss (≤1.35 W) |
| IFSM | 70 A - Single half-sine surge rating at 60 Hz; supports inrush and fault-current handling in SMPS outputs |
| RθJT | 35 °C/W - Junction-to-terminal thermal resistance; enables accurate thermal modeling when mounted on copper pads |
| IR @ 40 V | ≤ 2.0 mA - Reverse leakage at full rated voltage; impacts standby power in always-on systems |
| CT @ 4 V | 180 pF - Junction capacitance at 4 V reverse bias; influences high-frequency switching noise and EMI filtering design |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-diode configuration with cathode band polarity marking. Dimensions: 2.29–2.92 mm (A) × 4.00–4.60 mm (B) × 1.27–1.63 mm (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode | Current exit terminal | Connected to output rail; marked by band; ties to positive output capacitor and load |
Key Features
| Feature | Design Value |
|---|---|
| Very low VF | ≤0.45 V at 3.0 A ensures <1.4 W conduction loss, improving efficiency in 5–12 V output converters |
| Guard ring die | Enhances ESD and transient immunity without external TVS, reducing BOM count in compact power stages |
| Surge rating | 70 A IFSM supports 10× rated current for 1 cycle, enabling reliable operation during cold-start or overload |
| Lead-free & green | Meets RoHS 2 and halogen/antimony limits (<900 ppm Br/Cl, <1000 ppm Sb); qualifies for eco-labeling programs |
Applications
| DC/DC Converter Output Rectification | USB Power Delivery Adapter |
|---|---|
Use Scenario: Secondary-side synchronous or Schottky rectification in isolated flyback or forward converters delivering 5–20 V at up to 3 A. IC Role / Device Role: Unidirectional current path with minimal forward loss; replaces higher-VF silicon diodes to improve efficiency. Use Value: 0.45 V VF at 3 A reduces conduction loss by ~40% vs. standard 1N5822, increasing full-load efficiency by 1.2–1.8%. | Use Scenario: 5 V/3 A output stage in compact wall-mounted USB PD adapters with tight thermal constraints. IC Role / Device Role: Primary output rectifier handling continuous 3 A load and peak surges during plug insertion. Use Value: RθJT = 35 °C/W and 150 °C max TJ allow operation on minimal copper area, enabling sub-20 mm² PCB footprint. |
| Industrial PLC Power Supply | Automotive Infotainment DC-DC Stage |
Use Scenario: 12 V auxiliary rail generation in programmable logic controllers exposed to wide ambient (-40 to +85 °C). IC Role / Device Role: Input rectifier for buck-derived 12 V supply feeding I/O modules and communication interfaces. Use Value: Stable VF over temperature and ≤2.0 mA IR at 40 V ensure predictable dropout and low standby drain across operating range. | Use Scenario: 5 V/3 A point-of-load supply for display controller and audio DSP in head unit subsystems. IC Role / Device Role: High-reliability output rectifier meeting AEC-Q101 stress requirements via guard ring and 150 °C rating. Use Value: 70 A surge rating withstands load-dump transients; RoHS/green compliance satisfies automotive OEM material declarations. |
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 VRRM, 3 A IO, but VF = 0.55 V @ 3 A; RθJT ≈ 45 °C/W | Higher conduction loss; requires larger thermal pad for same current | Select if cost sensitivity outweighs efficiency targets and thermal space permits |
| MBR340 (ON Semiconductor) | Identical 40 V/3 A rating; VF = 0.52 V @ 3 A; SMB package only | SMB footprint incompatible with SMA layout; slightly higher VF increases loss | Choose only when SMB board revision is already committed and thermal margin exists |
Compared with SS34 and MBR340, B340LA-13-F delivers the lowest VF (≤0.45 V) and best thermal resistance (35 °C/W) in SMA, making it optimal for space-constrained, high-efficiency 3 A rectification where layout reuse and thermal headroom are critical.
Availability
B340LA-13-F is available at Aetrix Electronics and suitable for DC/DC converter output rectification, USB power delivery adapters, and industrial PLC power supplies requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for B340LA-13-F 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, high-reliability components for power management and signal integrity.
The B340LA/B series belongs to Diodes' low-VF Schottky rectifier product line, engineered specifically for high-efficiency secondary-side rectification in compact, thermally constrained AC/DC and DC/DC power supplies.
FAQ
What is the maximum junction temperature for continuous operation?
The B340LA-13-F has a specified operating junction temperature range of -55 °C to +150 °C. Continuous operation at 150 °C is permitted when average forward current is derated per Figure 4 in the datasheet, with 3.0 A allowed only at TA ≤ 90 °C on the defined FR-4 test board.
Is B340LA-13-F suitable for use in automotive applications?
B340LA-13-F meets AEC-Q101 stress test requirements when qualified per Diodes' internal qualification report (not explicitly stated on the public DS30240 Rev. 12–2 datasheet). Its 150 °C TJ rating, guard ring construction, and RoHS/green compliance support under-hood and infotainment use, though formal AEC-Q101 certification documentation must be obtained separately.
How does the SMA package compare to SMB in thermal performance?
The SMA package of B340LA-13-F has RθJT = 35 °C/W, while the SMB-packaged B340LB-13-F has identical thermal resistance per Diodes' characterization. Both packages deliver equivalent junction-to-terminal thermal performance, but SMA offers smaller footprint (2.92 × 4.60 mm vs. 3.94 × 4.57 mm), favoring space-constrained layouts.
Can this diode replace a standard PN junction rectifier like 1N5822?
Yes - B340LA-13-F is a direct functional replacement for 1N5822 (40 V, 3 A) with significantly lower VF (≤0.45 V vs. ~0.9 V), resulting in ~50% lower conduction loss. No circuit modification is needed, but layout must accommodate SMA footprint and ensure cathode band orientation matches original polarity.
B340LA-13-F 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:
- 450 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 2 mA @ 40 V
- Capacitance @ Vr, F:
- 180pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
- Operating Temperature - Junction:
- -55°C ~ 125°C
B340LA-13-F FAQ
1.How can I place an order for B340LA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for B340LA-13-F 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 B340LA-13-F reliable?
The price and inventory of B340LA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B340LA-13-F is usually 5 days.
3.What payment methods are accepted for B340LA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B340LA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B340LA-13-F?
B340LA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B340LA-13-F 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 B340LA-13-F?
For technical support, including B340LA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B340LA-13-F requirements.
6.How does Aetrix verify that B340LA-13-F is sourced from the original manufacturer or authorized distributors?
All B340LA-13-F 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 B340LA-13-F meets industry standards.
7.What is the process for return or replacement of B340LA-13-F?
All B340LA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with B340LA-13-F, 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 B340LA-13-F part is unused and in its original packaging.
Return procedure for B340LA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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