What is the B340A used for?

It is commonly used in power supplies, LED lighting, communication devices, and consumer electronics where fast switching and low forward voltage drop are required.

What are the key specifications of the B340A?

Key specs include a 40V maximum DC blocking voltage, 3A average forward rectified current, 0.55V forward voltage drop, and a 100A peak forward surge current.

What should engineers review before using the B340A?

Engineers should review the thermal resistance (RθJA = 55°C/W) and the forward current derating curve to ensure the device operates within safe temperature limits.

What are the sourcing risks for the B340A?

The B340A is a widely available commodity component with high stock levels, presenting low sourcing risk.

B340A Datasheet, Alternatives & Specs | Microdiode Semiconductor (Shenzhen) Co., Ltd.

AI summary

The B340A is a 40V, 3A Schottky barrier rectifier in an SMA package, ideal for high-efficiency, ultra-fast switching in power supplies and consumer electronics.

Best for

Power supply rectification
High-frequency switching
General-purpose low-voltage applications

Avoid if

High-temperature environments exceeding 150°C
Applications requiring extremely low reverse leakage at high temperatures

Check before use

PCB pad layout dimensions
Thermal dissipation requirements

Key specifications

Reverse Voltage: 40 V
Forward Current: 3 A
Forward Voltage: 0.55 V
Package: SMA (DO-214AC)

Compliance & Environment

RoHS: RoHS compliant
REACH: -
MSL: -
ECCN: -
HTSUS: -

Application

Power SuppliesConsumer ElectronicsLED Lighting

Datasheet

03f9bf447d76fa954c78c123dbddcfab_2407101107_MDD-Microdiode-Semiconductor-B340A_C64982.pdf

800 KB

Datasheet AI

CAD Models

EDA symbol, PCB footprint, and 3D model for this component. Supported tools include Altium, KiCad, Eagle, and more.

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PCB Footprint

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Where to Buy

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Alternative components

Part	Details	Match
SM340AFUXINSEMI	A 40V, 3A Schottky diode in the same SMA package with nearly identical electrical characteristics.	Needs validation

Design and risk insights

Questions & answers

The B340A is a surface-mount Schottky barrier rectifier manufactured by MDD, designed for high-efficiency power rectification.

SS56MDD	A robust upgrade with higher 60V/5A ratings in the same SMA package.	Needs validation
SS54MDD	An upgrade with a higher 5A current rating in the same 40V/SMA package.	Needs validation

AI summary

Best for

Avoid if

Check before use

Key specifications

Compliance & Environment

Application

Datasheet

CAD Models

Where to Buy

Alternative components

Design and risk insights

Questions & answers

What is the B340A?+×

What is the B340A used for?+×

What are the key specifications of the B340A?+×

What should engineers review before using the B340A?+×

What are the sourcing risks for the B340A?+×