HT7333-LDO 3.3V Linear Voltage Regulators TO-92

HT7333-LDO 3.3V Linear Voltage Regulators TO-92 is a high-performance, low power consumption CMOS-based voltage regulator that provides a stable 3.3V output for sensitive electronic circuits. This device belongs to the HT73xx series and specifically targets battery-powered applications where maintaining a minimal quiescent current is vital for longevity. Consequently, it features a remarkably low standby current of only 2 µA, ensuring your devices remain powered for extended periods. Furthermore, the Low Dropout (LDO) architecture allows the regulator to maintain its target voltage even when the input voltage is very close to the output. Therefore, you should choose the HT7333 for any design requiring a compact, through-hole solution for precise voltage regulation in energy-constrained environments.

Key Features:

• Ultra-Low Quiescent Current: The regulator draws only ≈ 2 µA during standby, which significantly extends the battery life of portable electronics.
• Low Dropout Voltage: It maintains a stable 3.3V output with a very small difference between input and output voltages, typically around 170 mV at medium loads.
• High Input Voltage Tolerance: The device safely accepts input voltages up to 12V, providing flexibility for various power source configurations.
• High Accuracy: Delivers a precise output voltage with a tolerance of ±3%, ensuring reliable performance for microcontrollers and sensors.
• CMOS Technology: Utilizes advanced CMOS manufacturing to achieve low power dissipation and high stability across temperature variations.

Technical Specifications:

• Output Voltage (V_OUT): 3.3V Fixed
• Maximum Input Voltage (V_IN): 12 V
• Output Current (I_OUT): 250 mA
• Quiescent Current (I_SS): 2 µA (Typical), 4 µA (Maximum)
• Dropout Voltage (V_DROP): 170 mV at 40 mA load
• Output Voltage Accuracy: ±3%
• Operating Temperature: −40°C to +85°C

Mechanical Specifications:

• Package Type: TO-92 (Through-Hole)
• Case Material: Molded Plastic (Epoxy)
• Lead Finish: Tin-Plated Copper
• Reliability: Built-in over-current protection for enhanced component safety.

Dimensions:

• Body Height: ≈ 4.58 mm
• Body Width: ≈ 4.58 mm
• Body Thickness: ≈ 3.30 mm
• Lead Length: ≈ 13.5 mm
• Lead Pitch: ≈ 1.27 mm

Pinout and Wiring:

• Pin 1 (GND): Connect this pin to the common circuit ground.
• Pin 2 (VIN): Connect the unregulated input voltage source (up to 12V) here.
• Pin 3 (VOUT): This pin provides the regulated 3.3V output to your load.
• Wiring Note: However, you must include a 10 μF capacitor on both the input and output pins to ensure stability and reduce voltage ripple during operation.

Datasheet Reference:

• Download Holtek HT7333-LDO Datasheet

Commonly Used in:

• Battery-Powered Devices: Essential for maintaining efficiency in hand-held tools, toys, and remote controls.
• Wireless Modules: Powering ESP8266, ESP32, and NRF24L01 modules where low noise and low power consumption are critical.
• Microcontroller Projects: Providing a steady 3.3V rail for Arduino Pro Mini and other low-voltage development boards.

Applications:

• IoT Sensors: Acts as the primary regulator for networked sensor nodes that spend most of their time in sleep mode.
• Portable Medical Equipment: Powers digital thermometers and pulse oximeters reliably.
• Consumer Electronics: Integrated into cameras and portable audio players for internal voltage regulation.

Equivalent Models:

• MCP1700-3302E: A popular LDO with similar ultra-low quiescent current specs and 250mA output.
• XC6206P332MR: A CMOS LDO alternative, although it is typically found in SOT-23 packages.
• AP7333: Provides comparable 3.3V regulation, however, pin configurations may vary between manufacturers.

Package Includes:

• 1 x HT7333-LDO 3.3V Linear Voltage Regulator TO-92