Dual op-amp for single-supply signal chains
The OP284EPZ is a dual general-purpose operational amplifier from Analog Devices, delivering rail-to-rail output swing across a 3 V to 36 V supply span. With a 4.25 MHz gain-bandwidth product and 4V/µs slew rate, it handles moderate-speed analog signals — think sensor amplification, active filters, or data-acquisition front-ends — without the phase-reversal issues some older rail-to-rail designs exhibit at the supply rails.
4.25 MHz GBP and 4V/µs slew rate — what they mean for signal fidelity
The 4.25 MHz gain-bandwidth product sets the closed-loop bandwidth at a given gain: at a gain of 10, the -3 dB point lands around 425 kHz. The 4V/µs slew rate means a 10 V peak-to-peak output step slews in 2.5 µs — fast enough for 100 kHz sine waves without distortion, but the designer should check the large-signal response if driving a heavy capacitive load. The 100 µV typical input offset voltage keeps DC errors low enough for most general-purpose precision work without external trimming. Input bias current is 80 nA typical — a figure that matters when the source impedance exceeds 100 kΩ, where the bias current develops a voltage drop across the source resistance that adds to the offset. For lower-impedance sources (under 10 kΩ), the 80 nA bias is negligible.
Housed in an 8-pin DIP (0.300" width, 7.62 mm pitch), the OP284EPZ mounts through-hole — a format still preferred in prototyping, breadboard work, and legacy designs where the PCB already carries DIP sockets. The 8-PDIP supplier package footprint matches standard 0.100-inch pitch DIP layouts. The 10 mA output current per channel drives typical ADC inputs or logic-level loads directly.