4 MHz gain bandwidth, 16 V/µs slew rate — JFET input stage
The TL081IDT is a single JFET-input operational amplifier from STMicroelectronics, offering a 4 MHz gain bandwidth product and a 16 V/µs slew rate. The JFET input stage delivers 20 pA typical input bias current, making it suited for high-impedance sensor interfaces, photodiode amplifiers, and precision integrators where input loading must stay negligible. The single-channel configuration in an 8-SOIC package keeps the PCB footprint compact for multi-channel arrays or mixed-signal boards.
Sourcing and compliance
It is RoHS3 compliant, meeting the EU directive for lead-free and restricted-substance content — no exemption declarations needed for shipping into regulated markets.
What the ratings mean for your signal chain
The 4 MHz gain bandwidth product sets the usable closed-loop bandwidth — at a gain of 10, the -3 dB point is roughly 400 kHz, adequate for audio processing, active filters, and control-loop compensation in motor drives or power converters. With 1.4 mA typical supply current per channel, the TL081IDT fits into power-budget-constrained designs like battery-powered instrumentation or multi-channel data loggers where each op-amp's quiescent draw adds up. The 40 mA output current capability drives ADC inputs, cable capacitances, or low-impedance loads directly without an external buffer. The 20 pA input bias current is low enough that a 1 MΩ source resistor introduces only 20 µV of offset error, negligible in most circuits.