The OPA227 and OPA228 series op amps combine low noise and wide bandwidth with high precision to make them the ideal choice for applications requiring both ac and precision dc performance. The OPA227 is unity-gain stable and features high slew rate (2.3V/µs) and wide bandwidth (8MHz). The OPA228 is optimized for closed-loop gains of 5 or greater, and offers higher speed with a slew rate of 10V/µs and a bandwidth of 33MHz. The OPA227 and OPA228 series op amps are ideal for professional audio equipment. In addition, low quiescent current and low cost make them ideal for portable applications requiring high precision. The OPA227 and OPA228 series op amps are pin-for-pin replacements for the industry standard OP-27 and OP-37 with substantial improvements across the board.
The OPA2227/OPA4227 and OPA2228/OPA4228 series are low‑noise, high‑precision operational amplifiers designed for data acquisition, telecom, audio, and power‑supply control applications. They offer high CMRR (138 dB), low input bias current (10 nA max), and wide supply ranges.
Available in DIP‑8, SO‑8, DIP‑14 and SO‑14 packages, the devices operate from +2.5 V to +18 V and feature gain‑bandwidth products of 8 MHz (OPA227) and 33 MHz (OPA228), with slew rates up to 23 V/µs. The datasheet includes typical performance curves, absolute maximum ratings, and mechanical dimensions.
| Low Noise | 3 nV/√Hz |
|---|---|
| Supply Voltage Range | +2.5 V to +18 V |
| CMRR | 138 dB |
| Open‑Loop Gain | 160 dB |
| Input Bias Current | 10 nA max |
| Input Offset Voltage | +5 µV to +75 µV (typical) |
| Gain Bandwidth Product (OPA227) | 8 MHz |
| Gain Bandwidth Product (OPA228) | 33 MHz |
| Slew Rate (OPA227) | 23 V/µs |
| Slew Rate (OPA228) | 1 V/µs |
The OPA2227 series operates from +2.5 V to +18 V.
The OPA228 has a gain‑bandwidth product of 33 MHz.
OPA4227 and OPA4228 are offered in DIP‑14 and SO‑14 packages.
Input offset voltage ranges from +5 µV to +75 µV (typical).