The Texas Instruments TL034IN is a JFET-input quad operational amplifier in a 14-pin PDIP through-hole package. It combines a 1.1 MHz gain-bandwidth product with a 5.1 V/µs slew rate, drawing just 870 µA total supply current across all four amplifiers — roughly 218 µA per channel. The JFET input stage delivers a typical input bias current of 2 pA, making this part suited for high-impedance sensor interfaces such as photodiode amplifiers, pH probe buffers, and electrometer-grade front ends.
Supply current — the power budget story
At 870 µA total for four channels, the TL034IN is a micropower JFET op-amp. Each amplifier burns about 218 µA, which is roughly one-tenth the supply current of a general-purpose bipolar quad like the LM324. That difference matters when you are sizing the regulator for a multichannel analog board or extending battery life in a portable instrument. The trade-off is moderate speed — 1.1 MHz GBW and 5.1 V/µs slew rate — so this is not a part for video or fast ADC drivers, but it handles audio-band and low-frequency sensor signals cleanly.
Input bias current — the JFET advantage
With 2 pA typical input bias current, the TL034IN preserves signal accuracy when the source impedance is high. A photodiode with 10 MΩ shunt resistance sees less than 20 µV of offset error from bias current — a bipolar op-amp with 100 nA bias would add 1 V of error. For pH probes, electrochemical sensors, or charge amplifiers, the JFET input is the practical choice. The 790 µV maximum input offset voltage is typical for a low-power JFET quad; if sub-100 µV offset is required, look at auto-zero or chopper-stabilized parts.
Package and mounting — through-hole legacy
This is the traditional DIP form factor for prototyping, breadboarding, and legacy designs that avoid surface-mount assembly. The PDIP body is compatible with standard 0.3" wide 14-pin sockets. If your BOM has migrated to SMT, the TL034 family also comes in SOIC-14 and TSSOP-14 variants — the TL034CD and TL034ID respectively — which share the same die and parametric performance.
Lifecycle and sourcing
For volume production or dual-source requirements, the TL034 family includes multiple package options with the same electrical characteristics.