Texas Instruments TL084QD

Overview

TL084QD 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 TL084QD datasheet, TL084QD pinout, TL084QD application, or TL084QD equivalent, this page provides verified electrical specifications, SOIC-14 package details, functional pin mapping, real-world application context, and validated alternative options for design-in and supply continuity planning.

Technical Context

The TL084QD implements a high-slew-rate JFET-input stage with integrated EMI/RF filtering and 1.5 kV HBM ESD protection. Its input stage supports common-mode voltage up to V_CC+, enabling single-supply operation with biasing flexibility. The quad architecture shares thermal coupling across amplifiers but maintains channel separation better than 1 µV/V at DC.

It features output short-circuit protection and stable unity-gain operation with up to 300 pF capacitive load. The device meets full industrial temperature range (–40°C to +125°C) and supports wide supply rails (±2.25 V to ±20 V), making it suitable for ruggedized instrumentation and motor drive feedback circuits.

Key Specifications

Pinout & Package

TL084QD is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package, designated as "D" per Texas Instruments' packaging nomenclature. This surface-mount package measures 8.65 mm × 3.91 mm × 1.75 mm and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL084CDR and OPA4134UA, TL084QD uniquely combines extended temperature operation (–40°C to +125°C), V_CC+-inclusive input range, and on-die EMI filtering-making it the only option among the three qualified for industrial motor drives and outdoor solar inverters without circuit modification.

Availability

TL084QD is available at Aetrix Electronics and suitable for solar inverter manufacturing, pro audio hardware development, and battery test system integration requiring stable component supply across extended temperature and EMI-prone environments.

Supply support for TL084QD 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 decades of heritage in precision op-amps and industrial-grade signal chain solutions.

The TL084QD belongs to TI's TL08xH family-engineered for cost-sensitive yet rugged applications demanding high slew rate, low offset, and robust ESD/EMI performance across –40°C to +125°C.

FAQ

What is the maximum operating temperature for TL084QD?

The TL084QD is rated for operation from –40°C to +125°C ambient temperature. This extended industrial temperature range is confirmed in Section 5.3 of the official datasheet and enables use in under-hood automotive subsystems, solar inverter power stages, and factory-floor motor drives where thermal stress exceeds commercial-grade limits. The TL084QD maintains specified offset drift (±2 μV/°C) and gain stability across this full range.

Does TL084QD support single-supply operation?

Yes, TL084QD supports true single-supply operation from 4.5 V to 40 V. Its common-mode input range extends to V_CC+, allowing direct interfacing with sensors or signals referenced to the positive rail-such as high-side current shunts-without external level-shifting circuitry. This capability is explicitly documented in Table 5-7 under "Common-mode voltage range" and distinguishes TL084QD from earlier TL08x variants.

What is the input bias current specification for TL084QD?

The TL084QD exhibits ultra-low input bias current: ±1 pA typical (±120 pA max) at 25°C, rising to ±5 nA maximum over –40°C to +125°C. This JFET-input characteristic minimizes voltage errors in high-impedance sensor interfaces (e.g., piezoelectric transducers or pH electrodes) and ensures stable DC operating points in integrator or filter circuits where leakage would otherwise cause drift.

Is TL084QD pin-compatible with standard TL084 packages?

Yes, TL084QD uses the industry-standard 14-pin SOIC (D package) footprint identical to TL084CDR, TL084IDR, and TL084ACDR. Pin numbering, spacing (1.27 mm pitch), and mechanical dimensions match JEDEC MS-012, enabling drop-in replacement on existing PCBs without layout changes-provided thermal and EMI design margins accommodate its higher performance envelope.

What load capacitance can TL084QD safely drive?

TL084QD is characterized to drive up to 300 pF capacitive load while maintaining stability and specified phase margin (56°). This is verified in Figure 5-25 ("Phase Margin vs Capacitive Load") and Table 5-7. For loads exceeding 300 pF, external isolation resistance (e.g., 10–50 Ω in series with output) is recommended to prevent peaking or oscillation-particularly critical in long-cable sensor interfaces or ADC driver applications.