Description
The LM321 is a low-power, single-channel operational amplifier that serves as the single-channel version of the popular LM324 quad op-amp. It’s designed for low-power systems and offers a wide supply voltage range, making it suitable for battery-powered and general-purpose applications.
Key Specifications
Key Features & Design Notes
-
Single-Supply Operation: The input common-mode range includes ground, so it can operate directly from a single supply without needing a negative rail or external biasing.
-
Low Power Consumption: With a quiescent current of only 430 µA (typical), it’s well-suited for battery-powered devices and portable electronics.
-
Stable with Capacitive Loads: The LM321 is designed to be stable with high capacitive loads, though you may need a small series isolation resistor (typically 50-100Ω) at the output if driving significant capacitance directly.
-
Internal Compensation: The device is internally frequency-compensated for unity-gain stability, simplifying circuit design.
-
Output Short-Circuit Protection: The output is protected against short circuits to ground (when V+ ≤ 15V), preventing damage from accidental shorts.
Pin Configuration (SOT-23-5)
Important Notes
-
Input Voltage Range: The input voltage should not exceed the supply voltage. If an input is driven below -0.3V, excessive current can flow, potentially causing output phase inversion.
-
Variants: Different manufacturers may produce LM321 variants with slightly different specifications. For example, SG Micro’s LM321X offers a wider temperature range (-40°C to +125°C) and rail-to-rail output. Always check the specific datasheet for your exact part number.
-
Not Rail-to-Rail: The output cannot swing all the way to the positive supply rail; expect the high output voltage to be approximately 1.5V below V+
Reviews
There are no reviews yet.