PJ4558 DIP-8 IC Grade-B Code: 76924322

The PJ4558D (often listed as NJM4558 or JRC4558) is a highly popular, dual-channel Operational Amplifier (Op-Amp) used primarily in audio circuits, preamps, and active filters. It is housed in an 8-pin package and is prized for its reliability and low noise characteristics.

Key Technical Specifications

• Number of Amplifiers:2 (Dual)
• Supply Voltage:± 5V to ± 15V (Total 10V to 30V)
• Bandwidth:3MHz unity-gain
• Slew Rate:7V/μ s
• Voltage Gain:100dB (typical)
• Package Type:8-Pin DIP (Dual In-Line Package)

Pin Configuration

The chip features two identical operational amplifiers. The pinout is standard for dual op-amps:

1. Output A
2. Inverting Input A
3. Non-inverting Input A
4. V-(Negative Supply Voltage / Ground)
5. Non-inverting Input B
6. Inverting Input B
7. Output B
8. V+(Positive Supply Voltage)

Common Applications

Because of its affordability and matched dual-channel capabilities, you will most often find the PJ4558D in:

• Guitar pedals (famous for being used in the Ibanez Tube Screamer)
• Audio mixers and preamplifiers
• Tone control (bass/treble) circuits

Equivalents and Replacements

If you need to replace or upgrade a PJ4558D, you can generally swap it with the LM4558, RC4558, or TL072. For a lower-noise, higher-fidelity upgrade, the NE5532 is a popular direct drop-in replacement.