Texas Instruments TL084QDG4

Overview

TL084QDG4 from Texas Instruments is a quad JFET-input operational amplifier optimized for precision analog signal conditioning in industrial and power electronics systems. It delivers 20 V/μs slew rate, 1 mV typical input offset voltage, 37 nV/√Hz input voltage noise at 1 kHz, ±2.25 V to ±20 V dual-supply operation, and rail-to-rail common-mode input range extending to VCC+. It is used in solar inverter feedback loops, motor drive current sensing, and pro-audio mixer gain stages.

For engineers reviewing the TL084QDG4 datasheet, TL084QDG4 pinout, TL084QDG4 application, or TL084QDG4 equivalent, this page provides verified specifications, SOIC-14 package terminal mapping, real-world use cases in UPS and battery test equipment, and two validated alternative parts with documented functional and layout implications.

Technical Context

The TL084QDG4 implements a high-slew-rate JFET-input differential pair with integrated EMI/RF filters and robust output short-circuit protection. Its architecture supports wide common-mode input (including VCC+) and maintains 125 dB open-loop gain across –40°C to +125°C.

It operates from ±2.25 V to ±20 V supplies with 937.5 μA per amplifier quiescent current, achieves 5.25 MHz gain-bandwidth product, and delivers 0.48 μs settling time to 0.01% for 2 V steps-enabling stable closed-loop performance in DC-coupled sensor interfaces and active filter designs.

Key Specifications

Pinout & Package

TL084QDG4 is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint (5.3 mm width, 1.27 mm pitch). The package is RoHS-compliant, lead-free, and rated for operation from –40°C to +125°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL084QDG4, TL084CDR trades ESD robustness and temperature range for lower cost, while OPA4134UA improves audio performance at the expense of slew rate and supply flexibility-making TL084QDG4 optimal for ruggedized power electronics requiring speed, noise resilience, and wide operating margins.

Availability

TL084QDG4 is available at Aetrix Electronics and suitable for solar inverter feedback, motor drive current sensing, and battery test equipment requiring stable component supply across extended temperature and long production lifecycles.

Supply support for TL084QDG4 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 design support infrastructure.

The TL084QDG4 belongs to TI's TL08xH FET-input op-amp family, engineered for cost-sensitive yet demanding applications requiring high speed, low noise, and operation across –40°C to +125°C in solar, motor control, and power backup systems.

FAQ

What is the maximum capacitive load the TL084QDG4 can drive stably?

The TL084QDG4 is characterized to drive up to 300 pF capacitive load while maintaining phase margin >56° and avoiding peaking in step response. For loads exceeding 300 pF, external isolation resistance (≥100 Ω) between amplifier output and capacitor is required to ensure stability in unity-gain configurations. This capability supports direct driving of ADC input capacitors and long PCB traces in motor control feedback paths.

Does the TL084QDG4 support single-supply operation?

Yes, the TL084QDG4 supports true single-supply operation from 4.5 V to 40 V. Its common-mode input range extends to VCC+, allowing inputs to swing up to the positive rail, and its output swings within 115 mV of VCC+ and 105 mV of VCC– under 10 kΩ load-enabling rail-referenced sensor interfaces and level-shifting circuits without dual supplies.

How does the TL084QDG4 differ from the legacy TL084CP?

The TL084QDG4 is the enhanced "H" grade variant: it features ±1500 V HBM ESD protection (vs. 1000 V), integrated EMI/RF filters (53 dB at 1 GHz), guaranteed 1 mV max offset (vs. 10 mV), and full –40°C to +125°C operation (vs. 0°C to 70°C). These improvements make TL084QDG4 suitable for modern solar inverters and industrial UPS where reliability and noise immunity are critical.

What is the thermal resistance (RθJA) of the TL084QDG4 in SOIC-14 package?

The TL084QDG4 in SOIC-14 (D package) has a junction-to-ambient thermal resistance (RθJA) of 114.2°C/W, measured per JEDEC JESD51-2 with 1-inch² 2-oz copper on a standard FR-4 board. This value assumes no internal thermal vias; adding two thermal vias under the exposed pad (if present) or increasing copper area can reduce RθJA by 15–25%, critical for sustained 4-channel operation at elevated ambient temperatures.

Can the TL084QDG4 replace the TL074 in existing designs?

Yes, the TL084QDG4 is pin-compatible with TL074 in SOIC-14 and offers superior slew rate (20 V/μs vs. 13 V/μs), lower input bias current (<120 pA vs. 200 pA), and improved EMI rejection (53 dB vs. 45 dB). However, TL084QDG4 exhibits higher input voltage noise (37 nV/√Hz vs. 18 nV/√Hz), so audio applications may require verification of SNR impact before substitution.