CA3420 is an integrated circuit operational amplifier that combines PMOS transistors and bipolar transistors on a single monolithic chip. It features very high input impedance, very low input currents, and operates at total supply voltages from 2V to 20V. It is internally phase compensated and has access terminals for additional frequency roll-off.
The CA3420 is a BiMOS operational amplifier that combines PMOS and bipolar transistors on a single chip. It offers very high input impedance, input currents below 1 pA, and rail‑to‑rail output swing, making it suitable for single‑supply applications such as picoammeters and high‑impedance voltmeters.
The device operates from 2 V to 20 V (single or dual supply), is internally phase‑compensated, and includes pins for offset nulling and external frequency compensation. It is RoHS‑compliant, Pb‑free, and available in PDIP packages.
| Supply Voltage Range | 2 V to 20 V |
|---|---|
| Input Current | < 1 pA (typical 0.2 pA) |
| Gain‑Bandwidth Product | 0.5 MHz |
| Output Swing | Rail‑to‑Rail |
The CA3420 typically draws less than 1 pA of input current (about 0.2 pA in typical conditions).
It operates from 2 V up to 20 V, either on a single supply or a dual‑supply configuration.
The gain‑bandwidth product is 0.5 MHz.