HT7350 5V 250mA Low Power Consumption SOT-89

HT7350 5V 250mA Low Power Consumption SOT-89 is a high-precision three-terminal low dropout (LDO) voltage regulator designed specifically for battery-powered systems and portable electronics. This CMOS-based device provides a fixed 5V output while maintaining an exceptionally low quiescent current, which typically measures only 4 μA. Consequently, it significantly extends battery life in standby mode compared to standard linear regulators like the 78L05 series. The HT7350 handles input voltages up to 12V and delivers a steady 250mA of output current with a very low dropout voltage. Furthermore, the SOT-89 package provides a compact footprint with enhanced thermal performance. Therefore, you should choose this regulator for modern embedded designs where energy efficiency and space optimization are critical priorities.

Key Features:

• Ultra-Low Quiescent Current: The device draws only ≈ 4 μA during operation, making it perfect for always-on battery applications.
• Low Dropout Voltage: It maintains regulation with a minimal voltage differential between input and output, typical of high-quality CMOS LDOs.
• High Input Voltage Tolerance: Supports input voltages up to 12V, providing a wide safety margin for various battery chemistries and DC adapters.
• High Output Accuracy: Delivers a stable 5V output with a tolerance of ±3%, ensuring reliable power for sensitive digital logic.
• Compact SOT-89 Package: Offers a small surface-mount profile while providing a large thermal pad for effective heat dissipation.

Technical Specifications:

• Output Voltage: 5.0 V Fixed
• Maximum Input Voltage: 12 V
• Output Current: 250 mA
• Quiescent Current (I_Q): 4 μA (typical)
• Dropout Voltage: ≈ 170 mV at 40 mA load
• Voltage Accuracy: ±3%
• Operating Temperature: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOT-89 (Surface Mount Device)
• Lead Finish: Matte Tin / Lead-Free compliant
• Moisture Sensitivity Level: MSL-1
• Case Material: Molded Plastic (UL 94 V-0 Rated)

Dimensions:

• Body Length: ≈ 4.5 mm
• Body Width: ≈ 2.5 mm
• Overall Height: ≈ 1.5 mm
• Lead Pitch: 1.5 mm

Pinout and Wiring:

• Pin 1 (GND): Connect this pin to the common ground of the circuit.
• Pin 2 (VIN): Connect the unregulated input voltage (up to 12V) to this pin.
• Pin 3 (VOUT): This pin provides the regulated 5V DC output.
• Wiring Note: However, you must place a 10 μF tantalum or ceramic capacitor on both the input and output pins to ground to ensure stability and reduce noise.

Datasheet Reference:

• Download Holtek HT7350-1 Datasheet

Commonly Used in:

• Battery Powered Equipment: Providing clean power to microcontrollers in devices that spend long periods in sleep mode.
• Portable Medical Devices: Supplying stable voltage to sensors and displays in handheld diagnostic tools.
• IoT Nodes: Powering wireless modules like the ESP8266 or LoRa transceivers from small Lithium-Ion cells.

Applications:

• Keep-Alive Supplies: Maintaining power to Real-Time Clocks (RTC) and RAM during system power-down.
• Microcontroller Power: Serving as the primary regulator for 5V logic in power-sensitive industrial controllers.
• Voltage References: Acting as a stable reference for analog-to-digital converters in basic instrumentation.

Equivalent Models:

• MCP1700-5002E: A popular alternative with similar low quiescent current and SOT-89 packaging.
• RT9161-50CX: A 5V LDO that supports higher output currents, however, it may have a higher quiescent current than the HT73 series.
• AP7331-50WG-7: A comparable 5V CMOS regulator often used in similar power-management designs.

Package Includes:

• 1 x HT7350 5V 250mA Low Power Consumption SOT-89