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The AP2181A and AP2191A are integrated high-side power switches optimized for Universal Serial Bus (USB) and other hot-swap applications. This family of devices complies with USB 2.0 and is available with both polarities of Enable input. The AP2181A and AP2191A offer current and thermal limiting and short circuit protection as well as controlled rise time and undervoltage lockout functionality. A 7ms deglitch capability on the open-drain Flag output prevents false over-current reporting and does not require any external components.


All devices are available in SO-8, MSOP-8EP, SOT25 and U-DFN2018-6 packages


  • Single USB port Power Switches


  • Over-Current and Thermal Protection
  • 2.1A Accurate Current Limiting
  • Reverse Current Blocking
  • 95mΩ On-Resistance
  • Input Voltage Range: 2.7V - 5.5V
  • 0.6ms Typical Rise Time
  • Very Low Shutdown Current: 1μA (max)
  • Fault Report (FLG) with Blanking Time (7ms typ)
  • ESD Protection: 4kV HBM, 400V MM
  • Active High (AP2151A) or Active Low (AP2141A) Enable

Product Specifications

Product Parameters

Maximum Continuous Output Current 1.5 A
Maximum Current Limit 2.6 A
Enable Logic Active High
Minimum Operating Voltage 2.7 V
Maximum Operating Voltage 5.5 V
Quiescent Current Typ 45 µA
RDS(ON) (VIN = 5V) Typ 95 mΩ
Output Discharge No
OCP Output Latch Off No
OCP Flag Yes
Operating Ambient Temperature Range -40 to 85 °C
UL Listed Yes
NEMKO IEC 60950-1 CB Yes

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Technical Documents

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP2191AW-7 Digi-Key Electronics 2851 8/8/2020 Buy Now United States
AP2191AW-7 Mouser Electronics Inc. 4569 8/8/2020 Buy Now United States


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