Product Brief
High Energy Power Line
Surge Protection
Littelfuse.com©2022 Littelfuse
Littelfuse high-power, high-energy TVS Diode Series (AK, LTKAK,
SMTOAK2, and SMTAK3) offer superior clamping performance over
standard Silicon Avalanche Diode (SAD) technologies, as well as a broad
range portfolio from 1 kA to 20 kA surge protection capability for a more
robust solution than conventional overvoltage protection methods.
Among all these high surge rating TVS diodes, the Littelfuse surface
mount LTKAK and SMTOAK2 series achieve a compact mechanical
design and are compatible with automated PCB assembly, providing
robust circuit protection.
Improve System Reliability and Lower
Maintenance Costs
• Designed to protect sensitive electronics from overvoltage surge
transients, inductive load switching voltage transients, as well as AC/
DC power line protection in systems, including:
• ICT, Medical, Industrial DC power supplies
• High power DC bus protection
• DC power supplies used in exposed and harsh environments
• Power over Ethernet (PoE) ports
• Small Cell, Micro Cell, Remote Radio Units (RRU), Baseband Units
(BBU)
• High power density SiC and GAN-based DC/DC converters/power
supplies
• Avionic power supplies
Applications
• Precise clamping voltage
• No wear-out mechanism
• Lower leakage
• Faster response
• Compact design (LTKAK/SMTOAK2 series)
• True SMD package compatible with automated PCB assembly
process (LTKAK/SMTOAK2 series)
• Improved lead inductance enabling lower clamping voltages
• Improved heat sink capability
• High power density, rated 2 kA 8/20 in a small footprint 10 mm x 15
mm x 5 mm (SMTOAK2 series)
Features & Benefits
Product Brief
Littelfuse.com©2022 Littelfuse
LTKAK
AK
Series
Name
Package Type Package
Polarity
Reverse Standoff
Voltage (V
R
)
Peak Pulse
Current
(I
PP
8x20μs)
Halogen
Free
RoHS
Compliant
Photo
(V) (kA)
AK1-Y Axial Leaded AK Bidirectional 76-430 1 Ye s Ye s
AK3-Y Axial Leaded AK Bidirectional
15-430
3 Ye s Ye s
AK6-Y Axial Leaded AK Bidirectional
30-430
6 Ye s Ye s
AK10-Y Axial Leaded AK Bidirectional
15-530
10 Ye s Ye s
AK15-Y Axial Leaded AK Bidirectional
58-190
15 Ye s Ye s
AK20-Y Axial Leaded AK Bidirectional
16-76
20 Ye s Ye s
LTKAK3 SMD SMTO-218 Bidirectional
66
3 Ye s Ye s
LTKAK6 SMD SMTO-218 Bidirectional
58-76
6 Ye s Ye s
LTKAK10 SMD SMTO-218 Bidirectional
58-86
10 Ye s Ye s
SMTAK3 SMD SMTAK Bidirectional
15-76
3 Ye s Ye s
SMTOAK2 SMD SMTO-263 Bidirectional 70 2 Ye s Ye s
Parts List Table
Low Vclamp Performance (SMD LTKAK vs. Axial Leaded AK)