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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated B340LA-13

Name: B340LA-13
Brand: Diodes Incorporated
SKU: B340LA-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: B340LA-13

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: B340LA-13.pdf

Description:: DIODE SCHOTTKY 40V 3A SMA

Quantity:: RFQ Add To RFQ list

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Inventory:2,227

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Product details

Overview

B340LA-13 from Diodes Incorporated is a 3.0A, 40V low-forward-voltage Schottky barrier rectifier in SMA package, featuring 0.35V typical V_F at 3.0A, 70A non-repetitive surge rating, and -40°C to +125°C operating range-used in DC/DC converter output rectification and USB power delivery circuits.

For engineers reviewing the B340LA-13 datasheet, B340LA-13 pinout, B340LA-13 application, or B340LA-13 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (25°C/W on alumina), reverse leakage at 40V, surge capability, and SMA package compatibility with automated SMT assembly.

Technical Context

This Schottky diode employs guard ring die construction for transient protection and is optimized for high-efficiency, low-loss operation in switching power supplies. Its low V_F minimizes conduction loss, while the 70A IFSM rating supports robust inrush handling during startup.

The device is rated for 3.0A average rectified current at 90°C terminal temperature when mounted on an alumina substrate, with reverse leakage limited to 2.0mA at 40V and 125°C-critical for maintaining efficiency in thermally constrained designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse voltage before breakdown; defines safe blocking capability in 36V nominal systems.
V_F @ 3.0A	0.35 V typ - Low conduction loss enables >92% efficiency in 5V-output buck converters at full load.
I_O	3.0 A - Continuous DC output current rating at TL = 90°C on alumina substrate; sets minimum heatsinking requirement.
I_FSM	70 A - Single half-sine surge rating at 60Hz; withstands capacitor-charging inrush without failure.
R_θJT	25 °C/W - Junction-to-terminal thermal resistance on alumina; determines temperature rise under 3A steady-state conduction.
I_R @ 40V	2.0 mA max @ 125°C - Reverse leakage directly impacts standby power loss in always-on power rails.
C_T	180 pF @ 4V - Low junction capacitance reduces switching noise and EMI in high-frequency SMPS (>500kHz).

Pinout & Package

SMA package (DO-214AC): molded plastic case, UL 94V-0 rated, cathode band polarity marking, solderable matte tin terminals, 0.064 g weight.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during forward conduction	Connected to input/source side of rectifier stage; must handle full load current and surge transients.
Cathode	Current exit point during forward conduction; marked with band	Connected to output/load side; low V_F here minimizes voltage drop into downstream regulation or filtering.

Key Features

Feature	Design Value
Very low forward voltage drop	0.35 V typical at 3.0A - reduces power dissipation by >40% vs. standard silicon rectifiers in same footprint.
Guard ring die construction	Enhanced transient immunity - suppresses edge breakdown during fast dv/dt events in SMPS flyback snubbers.
Low thermal resistance	25 °C/W junction-to-terminal - enables direct mounting on copper pour without external heatsink in 3A applications.
High surge capability	70A single half-sine - sustains repeated cold-start surges in automotive accessory power modules.
Lead-free terminal plating	Matte tin finish - RoHS-compliant, compatible with Pb-free reflow profiles (J-STD-020A Level 1 moisture sensitivity).

Applications

USB Power Delivery Adapter

Industrial DC/DC Converter

Use Scenario: Secondary-side synchronous rectification in 20W–65W USB-C PD adapters operating at 100–500kHz.

IC Role / Device Role / Timing Role: Low-V_F Schottky rectifier replacing MOSFET-driven synchronous rectifiers where gate drive complexity is undesirable.

Use Value: Eliminates gate driver circuitry while maintaining <0.4V output drop at 3A, simplifying layout and reducing BOM count.

Use Scenario: Output rectification in isolated 24V-input, 5V/3A industrial DC/DC modules with tight thermal constraints.

IC Role / Device Role / Timing Role: Primary unidirectional power path component converting transformer secondary AC to regulated DC output.

Use Value: 25°C/W R_θJT allows direct PCB copper thermal coupling, avoiding discrete heatsinks in sealed enclosures.

Automotive Infotainment Power Supply

Point-of-Load Regulator Input Stage

Use Scenario: 12V-to-5V pre-regulation in automotive head unit power tree, exposed to load dump transients.

IC Role / Device Role / Timing Role: Input rectifier and transient clamp in linear post-regulator stage following buck converter.

Use Value: Guard ring die withstands 100V/10ms load dump pulses without degradation, extending system lifetime.

Use Scenario: Input rectification for 3.3V/3A PoL regulator feeding FPGA core logic in telecom baseband cards.

IC Role / Device Role / Timing Role: High-frequency rectifier in compact, multi-phase buck-derived topology with minimal board area.

Use Value: 180pF C_T limits high-frequency ringing, reducing need for snubber RC networks and easing EMI filter design.

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 40V V_RRM, but 0.55V V_F @ 3A - 57% higher conduction loss.	Higher thermal rise in space-constrained layouts; requires larger copper area or forced air.	Select if cost sensitivity outweighs efficiency targets and thermal margin is available.
MBR340 (ON Semiconductor)	40V V_RRM, 0.52V V_F @ 3A, SMB package - 12% larger footprint, 0.093g weight.	Lower current density due to larger die; slightly better surge margin but reduced power density.	Prefer for legacy SMB footprints or where mechanical robustness outweighs size constraints.

Compared with SS34 and MBR340, B340LA-13 delivers the lowest V_F in SMA form factor, enabling higher power density and lower thermal overhead in modern compact power supplies-especially where board area and efficiency are co-constrained.

Availability

B340LA-13 is available at Aetrix Electronics and suitable for USB power delivery adapters, industrial DC/DC converters, and automotive infotainment power supplies requiring stable component supply across extended production cycles.

Supply support for B340LA-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 and signal integrity solutions for industrial, computing, and consumer markets.

The B340LA-13 belongs to Diodes' low-V_F Schottky rectifier product line, engineered specifically for high-frequency switching power supplies where conduction loss and thermal performance are critical.

FAQ

What is the maximum junction temperature for continuous operation?

The B340LA-13 has a maximum junction temperature of +125°C, with derated current capability above 90°C terminal temperature. At TL = 90°C, it sustains 3.0A average output current when mounted on an alumina substrate per JEDEC test conditions.

Is B340LA-13 compatible with lead-free reflow processes?

Yes-B340LA-13 features matte tin lead-free terminal plating and meets J-STD-020A Level 1 moisture sensitivity. It is qualified for standard Pb-free reflow profiles up to 260°C peak, with no pre-bake required.

How does the guard ring construction improve reliability?

The guard ring die structure prevents premature edge breakdown under high dv/dt or transient overvoltage, enhancing ruggedness in flyback snubbers and automotive load-dump scenarios-verified by 100V/10ms pulse testing per AEC-Q101 stress guidelines.

Can B340LA-13 replace B340A in existing designs?

Yes-B340LA-13 is a direct replacement for B340A (same V_RRM, I_O, and SMA package), but offers lower V_F (0.35V vs. 0.45V typ @ 3A) and improved thermal resistance (25°C/W vs. 30°C/W), yielding measurable efficiency and temperature gains.

B340LA-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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 FAQ

1.How can I place an order for B340LA-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for B340LA-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 B340LA-13 reliable?

The price and inventory of B340LA-13 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 is usually 5 days.

3.What payment methods are accepted for B340LA-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B340LA-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for B340LA-13?

B340LA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your B340LA-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 B340LA-13?

For technical support, including B340LA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B340LA-13 requirements.

6.How does Aetrix verify that B340LA-13 is sourced from the original manufacturer or authorized distributors?

All B340LA-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 B340LA-13 meets industry standards.

7.What is the process for return or replacement of B340LA-13?

All B340LA-13 units undergo pre-shipment inspection (PSI). If there is an issue with B340LA-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 B340LA-13 part is unused and in its original packaging.

Return procedure for B340LA-13:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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