JFET quad op-amp — what the TL084IN brings to the signal chain
The Texas Instruments TL084IN is a JFET-input quad operational amplifier — four independent op-amps in a single 14-pin DIP package, designed for applications where high input impedance and low bias current matter more than rail-to-rail output swing. With a 4 MHz gain-bandwidth product and 13 V/µs slew rate, this part handles audio-frequency conditioning, active filters, and fast-settling signal paths without the input current penalty of a bipolar op-amp. The 30 pA input bias current and 3 mV typical input offset voltage suit precision integrators, sample-and-hold stages, and photodiode amplifiers where the JFET front end keeps loading negligible.
Industrial temperature rating and through-hole package — fit for legacy and prototyping
Housed in a 14-PDIP (0.300-inch body) with through-hole mounting, this package is breadboard-friendly, hand-solderable, and compatible with legacy PCB layouts that lack surface-mount pads. Each of the four amplifiers draws 1.4 mA supply current and can deliver 40 mA output drive — enough to swing into a 600 Ω load or drive a downstream ADC input without a separate buffer stage.
Supply range and operating conditions
The TL084IN operates from a total supply span of 10 V to 30 V — dual supplies from ±5 V to ±15 V, or a single-ended rail up to 30 V. This flexibility lets it drop into existing ±15 V analog supplies without a regulator change. The base product number TL084 covers a family of JFET quad op-amps; the 'IN' suffix specifically denotes the PDIP-14 package and industrial temperature grade.
For designs still using the TL084IN, the PDIP-14 footprint is shared by several JFET quad op-amps in the same family.