BAV99WT1G Dual Switching Diode for Signal Protection and Compact PCB Designs

ElecSuppliers Part Number GuideAug 15, 2026

BAV99WT1G is a dual series switching diode from onsemi. Unlike a single small signal diode such as 1N4148W, this device integrates a pair of switching diodes in one compact package.

That dual diode arrangement is one of the main reasons to consider BAV99WT1G when PCB space is limited or when two related diode functions are required within the same circuit.

The device uses an SC70 package and is designed for surface mount assembly.

Dual Diode Configuration

BAV99WT1G contains two diodes connected in series internally.

This configuration allows the component to perform functions that would otherwise require two individual switching diodes. Integrating both devices into one package can simplify PCB routing and reduce the board area occupied by discrete components.

The component is rated for a maximum reverse voltage of 70 V and an average forward current of 200 mA per diode according to distributor specifications. Its reverse recovery time is approximately 6 ns, making it suitable for fast small signal switching applications.

BAV99WT1G for Signal Protection

One of the useful characteristics of this device is its suitability for signal protection.

The manufacturer lists applications including ESD protection, polarity reversal protection, data line protection, inductive load protection and steering logic.

This gives BAV99WT1G a wider role than simply acting as a rectifier. It can be incorporated into signal paths where the designer needs controlled diode conduction while maintaining a compact implementation.

Where BAV99WT1G Fits in a PCB

The SC70 package makes BAV99WT1G particularly suitable for compact electronics.

It can be positioned close to connectors, control signals, logic circuitry and other areas where diode protection or switching is required.

For high speed signal applications, the device's low capacitance is also relevant. Distributor specifications list maximum diode capacitance of approximately 1.5 pF, which can be useful when designing signal paths where excessive capacitance could affect the waveform.

BAV99WT1G Versus a Single Switching Diode

A common reason for choosing BAV99WT1G is component integration.

A design that needs two individual switching diodes may be able to use one BAV99WT1G instead. This can reduce component count and simplify the PCB layout.

However, the internal diode arrangement must match the circuit requirement. A BAV99WT1G should not be treated as a generic replacement for any single diode simply because the voltage and current ratings appear similar.

BAV99WT1G Package Considerations

BAV99WT1G uses the SC70 or SOT-323 surface mount package.

The small package is useful for high density PCB designs, but its pin configuration needs to be checked carefully when creating or modifying a footprint.

This is particularly important when replacing another BAV99 variant because different package versions can have different physical arrangements.

BAV99WT1G Supplier Information

For buyers searching for BAV99WT1G suppliers, the complete MPN should be used rather than simply searching for BAV99 diode.

The exact manufacturer, diode configuration, reverse voltage, forward current, package and product status should be confirmed before purchasing.

For production BOMs, the complete BAV99WT1G designation also helps prevent confusion with related BAV99 variants.

ElecSuppliers provides electronic component and supplier information for buyers searching for specific semiconductor part numbers such as BAV99WT1G.