The RT9161/A is a 300/500mA fixed output voltage low dropout linear regulator. Typical ground current is approximately 110μA, from zero to maximum loading conditions. Wide range of available output voltage fits most of applications. Built-in output current-limiting most thermal-limiting provide maximal protection against any fault conditions.
For ease of application, the RT9161/A comes in the popular 3-pin SOT-23 (300mA), SOT-89 (300mA), SOT-223 (500mA), or TO-92 packages.


  • Voltage Regulator for LAN Card, CD-ROM, and DVD
  • Wireless Communication Systems
  • Battery Powered Systems
Key Spec.
RT9161 RT9161A
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 12 12
Vout (min) (V) 1.5 1.5
Vout (max) (V) 5 5
Output Adj. Method Fixed Fixed
Accuracy (+/- %) 2 2
Iout (max) (mA) 300 500
Iq (typ) (uA) 110 110
Vdropout @ rated current (typ) (mV) 450 @ 0.3A;750 @ 0.5A 450 @ 0.3A;750 @ 0.5A
Cout Type Electrolytic Electrolytic
Features OCP OCP
Package Type SOT-223;SOT-23;SOT-89 SOT-223;SOT-23;SOT-89
  • Low Dropout Voltage of 200mV at Output Current 100mA, 450mV at Output Current300mA, and 750mV at 500mA Output Current
  • Guaranteed 300/500mA Output Current
  • Internal 1.5Ω P-MOSFET Draws No Base Current
  • Low Ground Current 110μA
  • 2% Accuracy Output Voltage
  • Input Voltage Range up to 12V
  • Extremely Tight Load Regulation
  • Fast Transient Response
  • Current-limiting and Thermal-limiting
  • RoHS Compliant and 100% Lead (Pb)-Free

TitleLast UpdateDownload
300/500mA Low Dropout Linear Voltage Regulator2011/10/04
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9161-50GVSOT-233000 Request Buy from Distributor
RT9161A-25GGSOT-2232500 Request Buy from Distributor