HT7833 3.3V 500mA linear voltage regulator IC SOT23-5

HT7833 3.3V 500mA Linear Voltage Regulator IC SOT23-5 is a high-efficiency, low-dropout (LDO) voltage regulator designed specifically to deliver a stable 3.3 V output from a higher voltage source. This tiny SOT23-5 device provides a reliable and precise power supply for modern low-voltage digital circuits, making it ideal for battery-powered and space-constrained applications. Furthermore, its low quiescent current minimizes power loss, which significantly extends battery life in portable electronics. Consequently, designers frequently select the HT7833 when they need robust protection features, including current limiting and thermal shutdown, ensuring long-term device stability and safety.

Key Features:

• Fixed Output Voltage: Delivers a precisely regulated output of 3.3 V, suitable for powering common microcontrollers, sensors, and wireless modules (e.g., ESP32, ESP8266).
• High Output Current: Capable of supplying a maximum continuous output current of 500 mA, which handles most intermediate-power requirements.
• Low Dropout Voltage: Features a low dropout voltage (V_DO), typically only 200 mV at 300 mA, maximizing efficiency and allowing the regulator to function effectively even when the input voltage is close to 3.3 V.
• Small Form Factor: The compact SOT23-5 package minimizes the required PCB area, making it a crucial component for miniaturized consumer electronics.
• Built-in Protection: Includes comprehensive current limiting protection and thermal shutdown circuitry, enhancing the device’s reliability under fault conditions.

Technical Specifications:

• Output Voltage (V_OUT): 3.3 V ± 2%
• Maximum Output Current (I_MAX): 500 mA
• Input Voltage Range (V_IN): 4.0 V to 18 V DC
• Dropout Voltage (V_DO): ≈ 200 mV at I_OUT = 300 mA
• Quiescent Current (I_Q): Typically 4 μA (Extremely low power consumption when lightly loaded)
• Output Capacitor Requirement: Stable operation with low ESR ceramic capacitors (≥ 1 μF recommended).
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOT23-5 (Surface-Mount Technology)
• Solderability: Reflow soldering compatible
• Body Material: Molded plastic compound
• Moisture Sensitivity Level (MSL): MSL 1 (Generally suitable for unlimited floor life at ≤ 30°C/85% RH)

Dimensions:

• Body Length: ≈ 2.9 mm
• Body Width: ≈ 1.6 mm
• Body Height: ≈ 1.1 mm
• Lead Pitch: 0.95 mm (Between pins)
• Weight: ≈ 0.01 g (Ultra-lightweight)

Pinout and Wiring:

• Pin 1 (GND): Connect to the circuit ground reference (0 V).
• Pin 2 (V_IN): Connect to the unregulated input voltage supply (4.0 V to 18 V).
• Pin 3 (V_OUT): The regulated 3.3 V output terminal. Connect to the load.
• Pin 4 (NC): No Connection. Leave this pin open or connect to GND.
• Pin 5 (CE): Chip Enable (Active High). Drive high to enable the regulator; drive low to disable it and enter sleep mode (low quiescent current).
• Wiring Note: Always place small ceramic bypass capacitors (≥ 1 μF) on both V_IN and V_OUT pins, situated as close as possible to the IC, in order to ensure stability.

Datasheet Reference:

• Download HT7833 LDO Regulator Datasheet

Commonly Used in:

• IoT and Wireless Devices: Powers common 3.3V microcontrollers and radio modules (like Bluetooth, Zigbee, or LoRa) where power efficiency is critical.
• Battery-Powered Gadgets: Found in portable measuring tools, security tags, and remote controls where the battery voltage drops over time.
• USB-Powered Circuits: Converts the 5V USB supply down to the required 3.3V for many digital logic circuits.

Applications:

• Voltage Level Shifting: Creates a stable 3.3V rail from higher input voltages (e.g., 5V or 9V) to power sensitive components.
• Power Conditioning: Cleans up noisy input power lines before they reach microprocessors, ensuring reliable operation.
• Energy Harvesting Circuits: Hence, its low dropout and low quiescent current make it perfect for systems sourcing power from solar cells or small generators.

Equivalent Models:

• AMS1117-3.3 (SOT-223): A very common 3.3V LDO, however, it features a much higher dropout voltage and typically comes in a larger package.
• LM1117-3.3 (SOT-223): National Semiconductor’s equivalent, which also offers a 3.3V fixed output but with higher dropout than the HT7833.
• XC6206P332MR (Torex): A similar low quiescent current, low dropout 3.3V LDO in a compact SOT-23 package, often used as a direct competitor.

Package Includes:

• 1 x HT7833 3.3V 500mA linear voltage regulator IC SOT23-5