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LF411 – PDIP‑8 JFET‑Input Operational Amplifier (Op‑Amp)

⚙️ LF411 – PDIP‑8 JFET‑Input Operational Amplifier (Op‑Amp)

The LF411 is a precision JFET-input op‑amp with low offset, low drift, and high slew rate, ideal for analog signal processing, high-speed integrators, active filters, and DACs.

📊 Key Specifications

ParameterValue
Supply Voltage (±V<sub>CC</sub>)±3.5 V to ±18 V (7 V to 36 V total) youtube.com+9ti.com+9ti.com+9sun-flytech.com+3mouser.com+3forum.arduino.cc+3
Gain‑Bandwidth Product (GBW)~3 MHz
Slew Rate8–13 V/µs
Input Offset VoltageMax 2 mV (typical 0.8 mV)
Input Bias Current50 pA typ (200 pA max at 25 °C)
Input Noise Voltage @1 kHz~18 nV/√Hz
Supply Current~2 mA per amplifier
Common Mode Input Range±(V<sub>CC</sub>–3.5 V) to ±(V<sub>EE</sub>+0.5 V)
Output Swing to Rails~1.5 V from each rail
Operating Temp RangeLF411C: 0–70 °C, LF411I: –40–85 °C
Package Options8‑pin PDIP‑8 or SOIC‑8

Other features include low harmonic distortion (<0.02%), low 1/f noise corner (~50 Hz), and balanced FET input stage for stability and accuracy. ti.com+8mouser.com+8tpelectronic.ir+8

🧩 Applications & Usage

  • High-speed integrators & active filters

  • Precision DACs, sample-and-hold, instrumentation

  • Low‑noise amplifiers, buffer stages, comparators

🔌 Basic Arduino Example: Non-Inverting Instream Amplifier

Wiring (±12 V rails required):

  • V<sub>CC+</sub> → +12 V

  • V<sub>CC–</sub> → –12 V

  • IN+ → Analog signal source

  • IN– → via feedback resistor network to output

  • Output → Arduino analog input (through voltage divider)

Example Code Snippet:

cpp
CopyEdit
float Vin = A0;
void setup(){
  Serial.begin(9600);
}
void loop(){
  int raw = analogRead(Vin);
  float voltage = raw * (5.0/1023.0); // from divider
  Serial.println(voltage);
  delay(200);
}

Ideal for amplifying analog sensors like strain gauges, photodiodes, thermocouples.

▶️ YouTube Tutorials

Op Amp Fundamentals & Circuits

📄 Official Datasheets

45.00 LE 45.00 LE

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Op‑Amp electronics 2 ERU