Resettable TCO protects higher-capacity Li-ion batteries

Touting a lightweight and smaller size, Bourns Inc. has released a
new series of miniature
resettable thermal cutoff (TCO) devices
, claiming breakthrough current capacity in a miniature package.
Building on its Model AA series, the new Model AC parts offer improved features
to protect higher-capacity lithium-ion (Li-ion) battery cells.


Helping battery pack designers save design space and weight, the
AC series is 0.12 mm thinner and 16% lighter than the existing Model AA
devices. The smaller size coupled with higher capacity also help designers
extend Li-ion cell usage beyond the traditional laptop, tablet, and smartphone
applications to power tools, electric vehicles, e-bikes, and grid storage
applications, said Bourns.

The previous Model AA series offered four trip temperature options
from 72°C to 85°C, which the Model AC extends with a fifth option of 90°C. The
new option can carry up to 20 A at 60°C. This makes it the highest
current-carrying TCO device that Bourns offers. The devices also offer
extremely low impedance/resistance (2 mΩ max.). The series is RoHS-compliant
and halogen-free.

for the Model AC72ABD is $0.73 each in quantities of 3,000. For more product
information, please see