Stand-alone product, Not requiring microcontroller control
9-serial cell lithium-ion rechargeable battery monitoring circuit (Integrated charge and discharge path)

Integrated charge and discharge path circuits | Separate charge and discharge paths circuits

The S-8245A Series are protection ICs for multi-serial cell lithium-ion rechargeable batteries featuring integrated high-accuracy voltage detection and delay circuits. The figure below is a circuit example showing how a cascade connection of the IC can be used to protect an 9-serial cell lithium-ion rechargeable battery pack.

S-8245A Series (9-serial cell, integrated charge and discharge path) Refer to the application notes for information on design caveats and constants for external components.


  • Introducing the S-8245A Series of 9-serial cell lithium-ion rechargeable battery protection circuits in a cascade connection
  • These ICs are stand-alone products that can protect lithium-ion rechargeable batteries without the need for a microcontroller


  • Overcharge detection
  • Overdischarge detection
  • Three-level discharge overcurrent detection (Discharge overcurrent 1 detection, Discharge overcurrent 2 detection, Load short-circuiting detection)
  • Charge overcurrent detection
  • Temperature detection is possible at four different points by connecting an NTC (High temperature detection ratio during charging / discharging, Low temperature detection ratio during charging / discharging)
  • 0 V battery charge function is selectable (Available or unavailable)
  • Charge/discharge current control employs Nch FET low side control system


  • 32.4V battery pack
  • Cordless power tools
  • Cordless gardening tool
  • Cordless cleaner
  • Robot cleaner
  • Portable storage battery
  • Drone
  • UPS (uninterruptible power supply)

Webshop (Online Samples)

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Evaluation boards (Inquiry)

Make inquiries about evaluation boards here.

test board
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  1. The above connection example may be changed without notice.
  2. It has not been confirmed whether the operation is normal or not in circuits other than the above connection example. The connection example shown above will not guarantee successful operation.