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The R3111N421C-TR-FE is a voltage regulator IC manufactured by RICOH. Below are its key specifications, descriptions, and features:

Specifications:

• Manufacturer: RICOH
• Part Number: R3111N421C-TR-FE
• Type: Low Dropout (LDO) Voltage Regulator
• Output Voltage: 4.2V (Fixed)
• Output Current: 150mA
• Input Voltage Range: 1.8V to 6.0V
• Dropout Voltage: 160mV (Typ.) @ 100mA
• Accuracy: ±1%
• Quiescent Current: 1.0µA (Typ.) in Shutdown Mode, 35µA (Typ.) in Operation
• Package: SOT-23-5 (Miniature Surface-Mount)
• Operating Temperature Range: -40°C to +85°C
• Protection Features: Overcurrent Protection, Thermal Shutdown

Descriptions:

The R3111N421C-TR-FE is a low-power LDO regulator designed for battery-powered applications. It provides a stable 4.2V output with high accuracy and low dropout voltage, making it suitable for portable devices such as IoT sensors, wearables, and small electronic modules.

Features:

• Ultra-Low Quiescent Current: Enhances battery life in power-sensitive applications.
• Low Dropout Voltage: Ensures stable operation even with low input voltages.
• High Ripple Rejection: Reduces noise in the output voltage.
• Shutdown Mode: Consumes minimal current when disabled.
• Miniature Package: SOT-23-5 for space-constrained PCB designs.
• Built-in Protections: Overcurrent and thermal shutdown for reliability.

This regulator is ideal for applications requiring a stable 4.2V supply with minimal power consumption.