The LM4040CIM3X-1.2 is a precision micropower shunt voltage reference from Texas Instruments (formerly National Semiconductor). This device is designed to provide a stable and accurate 1.225V reference voltage for a wide range of analog and mixed-signal applications. It's known for its low power consumption and small footprint, making it suitable for portable and battery-powered devices.

Applications

• Portable instrumentation
• Data acquisition systems
• Battery-powered devices
• Industrial sensors
• Voltage regulators
• Current sources
• ATE systems

Features

• Fixed 1.225V output voltage
• Initial accuracy: ±1% (C grade)
• Low temperature coefficient: 100 ppm/°C (typical)
• Operating current range: 65 μA to 15 mA
• Low dynamic impedance
• Micropower operation
• Small SOT-23 package

Benefits

• Stable Voltage Reference: Provides a consistent and reliable 1.225V reference, enhancing the accuracy of connected circuits.
• Low Power Consumption: Ideal for battery-operated devices, extending their operational lifespan.
• Small Size: The SOT-23 package allows for integration into compact electronic designs.
• Wide Operating Current Range: Adaptable to various applications with different current needs.
• Cost-Effective: Offers a balance of performance and affordability.

The LM4040CIM3X-1.2 requires an external series resistor to limit current flow. The resistor value must be chosen to ensure the current remains within the specified operating range (65 μA to 15 mA) across all input voltage conditions. The device is available in a space-saving SOT-23 package, making it ideal for densely populated circuit boards.

This voltage reference is particularly useful where a low-voltage reference is required while keeping power consumption to a minimum. Its characteristics make it suitable for various precision measurement and control applications.