AK10-FB Axial Leaded TVS Diodes

Introduction

Littelfuse AK10-FB is a series of axial-leaded transient-voltage-suppression (TVS) diodes intended for AC and DC line protection in severe surge-test environments. The series combines Controlled Foldback technology with a glass-passivated junction and a 10 kA current rating, providing a protection option for high-energy line-transient conditions.

The available devices cover reverse standoff voltages from 430 V to 570 V, placing the series in applications where relatively high-voltage AC or DC lines require dedicated surge protection.

What it does

AK10-FB diodes are designed to clamp transient overvoltage events on AC and DC lines. Their controlled foldback clamping characteristic is a central feature of the series, alongside a glass-passivated junction intended for clamping performance.

Key electrical characteristics supplied for the series include:

• Reverse standoff voltage range of 430 V to 570 V
• Maximum breakdown voltage range of 502 V to 687 V, tested at 10 mA
• Maximum reverse leakage current of 10 μA
• 10 kA current rating
• Maximum temperature coefficient of 0.1%/°C

The series also lists ESD protection to IEC 61000-4-2 at 15 kV air discharge and 8 kV contact discharge, plus EFT protection in accordance with IEC 61000-4-4.

Applications

Potential uses that follow from the stated line-protection function include:

• Surge protection on high-voltage AC input lines
• Transient suppression on DC power lines within the specified standoff-voltage range
• Equipment intended to operate in severe surge-test environments
• Designs requiring consideration of IEC 61000-4-2 ESD and IEC 61000-4-4 EFT conditions
• Through-hole protection assemblies using axial-leaded components

Design considerations

The AK10-FB series is supplied in an axial-leaded format, which may suit through-hole layouts and line-protection locations where leaded components are preferred. Devices are specified as capable of both reflow and wave soldering, offering flexibility for supported assembly processes.

Circuit selection should account for the required reverse standoff voltage, the corresponding breakdown-voltage range, and the 10 kA current rating. Designers should also consider the specified maximum reverse leakage current of 10 μA and the operating limits: a junction-temperature range of -55°C to +125°C and a storage-temperature range of -55°C to +150°C.

The glass-passivated junction and lead-free, RoHS-compliant construction may also be relevant to environmental and manufacturing requirements.

Availability and further information

Further technical information is available through the source/distributor and datasheet links provided on this page.