40. Battery Mini-Breaker for Smartphone Battery Protection

Meera is designing a Li-ion battery cell for a smartphone. 

The cell voltage is 3.7V nominal and the normal discharge current is up to 4A during peak usage like gaming and fast charging. 

To protect the cell from overtemperature and overcurrent, she needs a compact resettable thermal cutoff (battery mini-breaker) mounted on the cell. 

The device must trip at 77°C for early thermal protection and reset automatically when the temperature drops to a safe level. 

Key requirements: 

• Activation temperature: 77°C 

• Voltage rating: must cover single cell (max 4.2V) 

• Current rating: 6A to 12A (above 4A peak, compact size preferred) 

• Type: Breaker (resettable) 

The company's AVL specifies Littelfuse, so the part must be selected from Littelfuse on DigiKey. 

Help her select a suitable battery mini-breaker from Littelfuse on DigiKey.