Power Management ICs

Battery Protection IC for 2-Serial to 4-Serial-cell Pack (Secondary Protection) S-8224A/B Series

DatasheetJul. 29, 2019


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The S-8224A/B Series is used for secondary protection of lithium-ion rechargeable batteries, and incorporates high-accuracy voltage detection circuits and delay circuits.
Short-circuits between cells accommodate series connection of two cells to four cells.
The S-8224B Series limits its CO pin output voltage to 11.5 V max., so an FET with the gate withstand voltage of 12 V can be used.


High-accuracy voltage detection circuit for each cell
Overcharge detection voltage n (n = 1 to 4)
3.600 V to 4.700 V (50 mV step)
  Accuracy ±20 mV (Ta = +25°C)
  Accuracy ±25 mV (Ta = −10°C to +60°C)
Overcharge hysteresis voltage n (n = 1 to 4)*1
0.0 mV to −550 mV (50 mV step)
−300 mV to −550 mV Accuracy ±20%
−100 mV to −250 mV Accuracy ±50 mV
−50 mV Accuracy ±25 mV
0.0 mV Accuracy −25 mV to +20 mV
Delay times for overcharge detection are generated only by an internal circuit (external capacitors are unnecessary)
Overcharge detection delay time is selectable: 1 s, 2 s, 4 s, 6 s, 8 s
Overcharge release delay time is selectable: 2 ms, 64 ms
Built-in timer reset delay circuit
Output control function via CTL pin
Output form is selectable (S-8224A Series)
CMOS output, Nch open-drain output
Output logic is selectable (S-8224A Series)
Active “H”, active “L”
CO pin output voltage is limited to 11.5 V max. (S-8224B Series)*2
High-withstand voltage
Absolute maximum rating 28 V
Wide operation voltage range
3.6 V to 28 V
Wide operation temperature range
Ta = −40°C to +85°C
Low current consumption
During operation (VCU − 1.0 V for each cell): 0.25 μA typ., 0.6 μA max. (Ta = +25°C)
During overdischarge (VCU × 0.5 V for each cell): 0.3 μA max. (Ta = +25°C)
Lead-free (Sn 100%), halogen-free

*1. Select the overcharge hysteresis voltage calculated as the following formula. (Overcharge detection voltage n) + (Overcharge hysteresis voltage n) ≥ 3.4 V
*2. Only output logic active “H” is available.


  • Lithium-ion rechargeable battery packs (for secondary protection)

Parts List

Product NamePackageOvercharge
Delay Time
Delay Time
Output FormOutput Logic
Product Name
S-8224AAS-I8T1USNT-8A4.450−400464CMOS outputActive “H”
S-8224AAT-I8T1USNT-8A4.350−400464CMOS outputActive “H”
S-8224AAU-I8T1USNT-8A4.500−400464CMOS outputActive “H”
S-8224AAV-I8T1USNT-8A4.550−400664CMOS outputActive “H”
S-8224AAW-I8T1USNT-8A4.450−400664CMOS outputActive “H”
S-8224AAX-I8T1USNT-8A4.350−400664CMOS outputActive “H”
S-8224ABA-I8T1USNT-8A4.400−400664CMOS outputActive “H”
S-8224ABB-I8T1USNT-8A4.500−400664CMOS outputActive “H”
S-8224ABC-I8T1USNT-8A4.600−400464CMOS outputActive “H”
S-8224ABD-I8T1USNT-8A4.300−400264CMOS outputActive “H”
S-8224BAA-I8T1USNT-8A4.350−40042CO pin output voltage 11.5 V max.Active “H”
S-8224BAB-I8T1USNT-8A4.450−400664CO pin output voltage 11.5 V max.Active “H”
S-8224BAC-I8T1USNT-8A4.350−400464CO pin output voltage 11.5 V max.Active “H”

Please confirm the product name and specifications with the data sheet again.

Last modified: Mar. 05, 2018

  • These descriptions may be different from the actual product name and parameter.
    Please confirm the product name and specifications with the data sheet again.
  • The information herein is subject to change without notice.