LM321MFX A63A Low Power Operational Amplifier SOT23-5

LM321MFX A63A Low Power Operational Amplifier SOT23-5 is a high-performance, single-channel operational amplifier designed specifically for space-constrained and power-sensitive applications. This versatile IC offers a wide supply range and low quiescent current, making it an ideal choice for battery-operated portable electronics. Furthermore, the LM321MFX provides a cost-effective solution for signal conditioning without compromising on electrical stability or performance. Consequently, engineers frequently select this SOT23-5 package to reduce PCB footprint while maintaining high reliability in industrial and consumer circuits. Therefore, you can easily integrate this amplifier into modern designs that require a balance between low power consumption and robust gain characteristics.

Key Features:

• Compact SOT23-5 Package: The ultra-small surface-mount footprint saves significant board space compared to traditional DIP or SOIC packages.
• Low Power Consumption: It operates with a very low quiescent current of typically 430 μA, which extends the battery life of portable devices.
• Wide Supply Range: The device supports a broad operating voltage from 3 V to 32 V for single supplies, providing immense design flexibility.
• Large Output Voltage Swing: It allows for a maximum dynamic range by providing an output swing that reaches near the supply rails.
• Internal Frequency Compensation: The integrated compensation circuitry ensures stable operation across a wide range of closed-loop gains without requiring external components.

Technical Specifications:

• Supply Voltage (V+ to V-): 3 V to 32 V (Single Supply)
• Quiescent Current: 430 μA (Typical)
• Gain Bandwidth Product: 1 MHz
• Slew Rate: 0.4 V/μs
• Input Offset Voltage: 7 mV (Maximum)
• Input Bias Current: 45 nA
• Common-Mode Rejection Ratio (CMRR): 85 dB
• Operating Temperature: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOT23-5 (Small Outline Transistor)
• Marking Code: A63A
• Lead Finish: Matte Tin (Pb-Free/RoHS Compliant)
• Mounting Type: Surface Mount Technology (SMT)

Dimensions:

• Body Length: ≈ 2.90 mm
• Body Width (excluding leads): ≈ 1.60 mm
• Total Height: ≈ 1.45 mm (Maximum)
• Lead Pitch: 0.95 mm
• Overall Width (including leads): ≈ 2.80 mm

Pinout and Wiring:

• Pin 1 (Output): Delivers the amplified output signal to the next stage of the circuit.
• Pin 2 (V-): Connect this pin to the system ground or negative supply rail.
• Pin 3 (Non-Inverting Input +): Receives the input signal for non-inverting amplification.
• Pin 4 (Inverting Input -): Receives the signal or feedback for inverting configurations.
• Pin 5 (V+): Connect to the positive DC power supply rail.

Datasheet Reference:

• Download LM321 Operational Amplifier Datasheet

Commonly Used in:

• Portable Instrumentation: Handheld meters and diagnostic tools benefit from its low current draw.
• Sensor Interfaces: Specifically, it excels at conditioning low-frequency signals from temperature or pressure sensors.
• Active Filters: Used to create low-pass, high-pass, or band-pass filters in audio and communication equipment.

Applications:

• Current Sensing: Serving as a buffer or amplifier for shunt resistor voltage drops in power management systems.
• Battery Chargers: Monitoring charge voltage and current levels with high precision.
• Transducer Amplifiers: Converting small physical signals into measurable electronic levels.
• General Purpose Gain Blocks: Providing a simple gain stage in diverse embedded electronic designs.

Equivalent Models:

• LM358 (Half): The LM321 essentially functions as a single-channel version of the popular LM358 dual op-amp.
• MCP6001: A Microchip alternative that offers rail-to-rail input and output, however, voltage ratings may differ.
• TLV271: A similar CMOS operational amplifier in the same SOT23-5 footprint for low-voltage applications.

Package Includes:

• 1 x LM321MFX A63A Low Power Operational Amplifier SOT23-5