TL084CN (Quad Low-Noise JFET-Input Op-Amp)

🎛️ TL084CN – Quad Low-Noise JFET-Input Op-Amp

(Texas Instruments, STMicroelectronics, etc.)

📌 General Description

The TL084CN is a quad op-amp featuring high input impedance, low noise, and low input bias current, thanks to its JFET input stage. It's widely used in analog signal processing, active filters, instrumentation, oscillators, and audio preamp circuits.

The “CN” suffix indicates:

• C = Commercial Temperature Range (0°C to 70°C)
• N = DIP-14 Package (Dual In-Line Package)

⚙️ Key Specifications

📦 Pinout – DIP-14 Package (Top View)

       TL084CN
     .-------------.
  1 | 1OUT     V+ | 8
  2 | 1IN–     4OUT| 9
  3 | 1IN+     4IN–|10
  4 | V–       4IN+|11
  5 | 2IN+     3IN+|12
  6 | 2IN–     3IN–|13
  7 | 2OUT     3OUT|14
     '-------------'

🧪 Features

• Low noise and high slew rate (great for audio)
• Low distortion and wide bandwidth
• High input impedance (great for sensor/interface circuits)
• Four op-amps in one chip
• Compatible with single or dual supplies

🎯 Typical Applications

• Audio preamps and filters
• Signal conditioning (sensors, ADC input stages)
• Oscillators, waveform generators
• Active filters (low-pass, high-pass, band-pass)
• Integrators, summing amps, comparators

✅ Advantages

• High performance and stability
• Excellent for low-signal analog processing
• DIP package makes it easy for prototyping and repairs
• Works with single-supply or dual-supply systems

⚠️ Design Tips

• Bypass supply rails with 0.1µF and 10µF capacitors close to the IC
• Can be used with ±15V or +5V to +30V single supply
• Be cautious with input voltages — common-mode range does not reach rails