Keszoox
RT9193-33 / RT9193-33GB 3.3V LDO Voltage Regulator — SOT-23-5, 300mA (5-Pack)
RT9193-33 / RT9193-33GB 3.3V LDO Voltage Regulator SOT-23-5, 300mA (5-Pack)
Couldn't load pickup availability
RT9193-33 / RT9193-33GB — 3.3V LDO Voltage Regulator, SOT-23-5
The RT9193-33 (also marked RT9193-33GB) is a 300mA low-dropout (LDO) voltage regulator with a fixed 3.3V output in a compact SOT-23-5 SMD package from Richtek. With an ultra-low dropout voltage and an enable pin for power sequencing, it is ideal for powering ESP32, ESP8266, STM32, and other 3.3V microcontrollers from 5V or battery sources. Each pack contains 5 pieces.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | RT9193-33 / RT9193-33GB |
| Package | SOT-23-5 (SMD) |
| Output Voltage | 3.3V (fixed) |
| Output Current | 300mA |
| Input Voltage Range | 2.5V – 5.5V |
| Dropout Voltage | ~300mV @ 300mA |
| Quiescent Current | ~55uA (typical) |
| Enable Pin | Yes (active HIGH) |
| Output Noise | ~50uVrms |
| Operating Temperature | -40 to +125 degrees C |
| Condition | New, Original |
| Quantity | 5 pieces |
Why Choose RT9193-33?
- Low dropout ~300mV — works from 3.6V Li-ion battery down to near-empty
- Enable pin — power sequencing and shutdown control from microcontroller
- 55uA quiescent current — minimal standby power for battery-powered devices
- SOT-23-5 package — compact SMD for space-constrained PCB designs
- Low output noise — clean 3.3V for sensitive RF and analog circuits
- 5-pack value — enough for multiple boards or replacement stock
Typical Applications
- ESP32 / ESP8266 power supply — 3.3V from 5V USB or 3.7V Li-ion battery
- Arduino 3.3V rail — supplement or replace onboard 3.3V regulator
- STM32 / nRF52 power — clean 3.3V for ARM Cortex-M microcontrollers
- Sensor module power — stable 3.3V for I2C/SPI sensors and modules
- Portable device power management — enable-controlled 3.3V rail for sleep/wake power sequencing
FAQ
Q: Can RT9193-33 power an ESP32 from a 3.7V Li-ion battery?
A: Yes. With dropout ~300mV, it regulates 3.3V from inputs as low as 3.6V. A 3.7V Li-ion cell (3.0V cutoff) provides adequate headroom for most of its discharge cycle.
Q: What is the maximum input voltage?
A: 5.5V. Do not exceed this to avoid damaging the IC.
Q: Is RT9193-33GB the same as RT9193-33?
A: Yes. The GB suffix indicates the green/RoHS-compliant package variant. Electrically identical.
Package Contents
- 5x RT9193-33 / RT9193-33GB SOT-23-5 3.3V LDO Regulator (new, original)
