Texas Instruments TL084CD

Overview

TL084CD from Texas Instruments is a quad JFET-input operational amplifier designed for precision analog signal conditioning in industrial and audio systems. It delivers 20 V/μs slew rate, ±1 mV typical input offset voltage, 5.25 MHz gain-bandwidth product, 125 dB open-loop gain, and operates from ±2.25 V to ±20 V supplies. It is used in pro audio mixers and battery test equipment where low noise (37 nV/√Hz) and rail-to-rail common-mode input (including V_CC+) are critical.

For engineers reviewing the TL084CD datasheet, TL084CD pinout, TL084CD application, or TL084CD equivalent, this page provides verified specifications, SOIC-14 package details, functional pin mapping, real-world use cases in motor drive feedback and UPS monitoring, and two validated alternative parts with documented differences in offset drift and supply range.

Technical Context

The TL084CD uses JFET-input differential pairs to achieve ultra-low input bias current (±1 pA typ) and high input impedance (>1 TΩ), enabling accurate sensing in high-impedance sensor interfaces. Its internal compensation ensures unity-gain stability with capacitive loads up to 300 pF while maintaining 56° phase margin.

It features output short-circuit protection, EMI/RF filtering, and operation across –40°C to 85°C. The device supports dual-supply configurations only and does not include rail-to-rail output swing - output headroom is 115–210 mV from positive rail and 105–215 mV from negative rail at 40 V total supply.

Key Specifications

Pinout & Package

TL084CD is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package, surface-mount, 1.27 mm pitch, JEDEC MS-012 compliant, with thermal resistance R_θJA = 114.2°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad JFET-input op-amp applications.

Compared with TL084CN, TL084CD offers tighter offset specs and extended temperature capability; versus OPA4134UA, it trades some noise performance for broader supply range, built-in EMI hardening, and lower cost - making TL084CD optimal for ruggedized industrial signal chains where reliability and supply versatility outweigh marginal noise gains.

Availability

TL084CD is available at Aetrix Electronics and suitable for pro audio mixer design, battery test equipment manufacturing, solar string inverter development, and single-phase online UPS production requiring stable component supply across extended temperature and voltage ranges.

Supply support for TL084CD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of op-amp innovation and broad industrial market presence.

The TL084CD belongs to TI's legacy TL08x family of JFET-input op-amps, engineered for cost-effective, high-performance analog signal conditioning in industrial automation, power conversion, and professional audio systems.

FAQ

What is the maximum supply voltage for TL084CD?

The TL084CD supports a total supply voltage (V_CC+ – V_CC−) up to 40 V, corresponding to ±20 V dual-supply operation. Absolute maximum ratings specify 42 V for most packages, but recommended operating conditions limit continuous use to 40 V to ensure long-term reliability and parameter stability across temperature.

Does TL084CD support single-supply operation?

No, TL084CD is not characterized for true single-supply operation. Its input common-mode range includes V_CC+ but does not extend to ground when V_CC− = 0 V. It requires dual supplies (e.g., ±15 V or ±5 V) to meet datasheet specifications for offset, CMRR, and output swing.

What is the input bias current of TL084CD at 85°C?

At TA = 85°C, the TL084CD input bias current is specified at ±5 nA maximum (per amplifier), based on characterization data from TI's Electrical Characteristics tables. This remains significantly lower than bipolar-input op-amps, preserving accuracy in high-impedance sensor nodes.

Can TL084CD drive a 2 kΩ load effectively?

Yes - TL084CD delivers full output swing (±10 V min) into 2 kΩ loads at ±15 V supplies. However, output headroom increases to 520–965 mV from each rail under these conditions, reducing usable dynamic range compared to 10 kΩ loading. Designers should verify settling time (0.56 μs to 0.01%) meets system timing requirements.

Is TL084CD pin-compatible with TL084CP?

Yes, TL084CD (SOIC-14) and TL084CP (PDIP-14) share identical pin functions and numbering. Both follow the standard TL084x pinout: Pins 1–7 and 8–14 map identically to amplifier outputs, inputs, and supplies. Mechanical package differences do not affect circuit design or PCB footprint compatibility at the schematic level.