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The RT9742 is a cost-effective, low-voltage, single
N-MOSFET high-side Power Switch IC for USB application. Low switch-on resistance and low supply current are realized in this IC.

The RT9742 integrates an over-current protection circuit, a short fold back circuit, a thermal shutdown circuit and an under-voltage lockout circuit for overall protection. Besides, a flag output is available to indicate fault conditions to the local USB controller. Furthermore, the chip also integrates an embedded delay function to prevent miss-operation from happening due to inrush-current. The RT9742 is an ideal solution for USB power supply and can support flexible applications since it is available in TSOT-23-5, TSOT-23-5 (FC) and SOT-23-3 package.

Applications

  • USB Peripherals
  • Notebook PCs
Key Spec.
RT9742A RT9742B RT9742C RT9742D RT9742E RT9742F RT9742G RT9742H RT9742J RT9742K RT9742L RT9742M RT9742N RT9742P RT9742Q RT9742R RT9742S RT9742U RT9742V
Status Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active
Number of Outputs 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Vin (min) (V) 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7
Vin (max) (V) 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
Ron (typ) (mOhm) 55 55 55;70 55;70 55;70 55;70 55;70 55;70 70 70 70 70 55;70 55 70 70 70 70 70
Iq (typ) (mA) 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
Current Limit (typ) (A) 3.3 3.3 2.2 2.2 1.65 1.65 1.1 1.1 2.15 1.65 1.1 1.65 2.75 2.75 0.7 0.7 0.7 1.65 2.2
FLAG Indicator Yes Yes Yes Yes Yes Yes Yes Yes No No No Yes Yes Yes Yes Yes No Yes Yes
Iocp Adjustable No No No No No No No No No No No No No No No No No No No
Safety Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL Nemko;UL
Switch Type Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch Power Switch
Features Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP Enable Input;OCP;SCP
Package Type TSOT-25(FC) TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) TSOT-25;TSOT-25(FC) SOT-23 SOT-23 SOT-23 TSOT-25 TSOT-25(FC) TSOT-25(FC) TSOT-25 TSOT-25 SOT-23 TSOT-25 TSOT-25
Features
  • 70mΩ/55mΩ (typ.) N-MOSFET Switch
  • Operating Range : 2.7V to 6V
  • Reverse Blocking Current
  • Under Voltage Lockout
  • Deglitched Fault Report (FLG)
  • Thermal Protection with Fold-back
  • Over Current Protection
  • Short Circuit Protection
  • UL Approved-E219878
  • Nemko Approved-NO109777
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Analyzing VIN overstress in Power ICs App. Note2016/07/01
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT9742AGJ5FTSOT-25(FC)3,000 Request Digikey 2,645 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742ANGJ5FTSOT-25(FC)3,000 Request Digikey 7,673 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742BGJ5FTSOT-25(FC)3,000 Request Digikey 1,331 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742CGJ5TSOT-253,000 Request Digikey 1,345 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742CGJ5FTSOT-25(FC)3,000 Request Digikey 20,934 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742DGJ5TSOT-253,000 Request Digikey 2,817 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742EGJ5TSOT-253,000 Request Digikey 4,669 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742FGJ5TSOT-253,000 Request Digikey 1,148 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742GGJ5TSOT-253,000 Request Digikey 6,264 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742QGJ5TSOT-253,000 Request Digikey 3,698 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742QNGJ5TSOT-253,000 Request Digikey 632 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742SNGVSOT-233,000 Request Digikey Lead-Time: 14 weeks Not Available
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742UNGJ5TSOT-253,000 Request Digikey 1,236 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT9742VGJ5TSOT-253,000 Request Digikey 3,520 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT9742AGJ5F Digikey Lead-Time: 14 weeks Not Available
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Please confirm with our distributor or sales representative for actual stock status.
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