Texas Instruments TL084QDRG4

Overview

TL084QDRG4 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 input offset voltage (typ), 5.25 MHz gain-bandwidth product, and rail-to-rail common-mode input range extending to VCC+, supporting stable operation across ±2.25 V to ±20 V supplies. It is deployed in solar inverter feedback loops, motor drive current sensing, and UPS voltage regulation circuits.

For engineers reviewing the TL084QDRG4 datasheet, TL084QDRG4 pinout, TL084QDRG4 application, or TL084QDRG4 equivalent, this page provides verified electrical specifications, SOIC-14 package layout, real-world use cases in high-reliability power conversion, and validated alternative options with documented functional trade-offs.

Technical Context

The TL084QDRG4 integrates four independent high-slew-rate JFET-input op-amps sharing a single dual-supply interface. Its input stage uses matched JFET pairs to achieve ultra-low input bias current (±1 pA typ) and low drift (±2 μV/°C), enabling high-impedance sensor interfacing without significant DC error accumulation. The output stage supports ±26 mA short-circuit current and drives up to 300 pF capacitive loads while maintaining phase margin ≥56° at unity gain.

It operates across –40°C to +125°C with integrated EMI/RF filters and 1.5 kV HBM ESD protection. The device meets stringent thermal requirements for SOIC-14 packages (RθJA = 114.2°C/W), making it suitable for enclosed industrial enclosures where ambient temperature exceeds 85°C.

Key Specifications

Pinout & Package

TL084QDRG4 is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, compatible with automated SMT assembly and IPC-7351B footprint D_14_SOIC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL084CDR, TL084QDRG4 offers tighter offset, extended temperature rating, and built-in EMI suppression-critical for solar and UPS deployments. Against OPA4134UA, it trades noise performance for lower power and higher ruggedness, making it preferable in industrial power electronics where thermal headroom and reliability dominate.

Availability

TL084QDRG4 is available at Aetrix Electronics and suitable for solar inverter feedback control, motor drive current sensing, and three-phase UPS regulation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL084QDRG4 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 application expertise.

The TL084QDRG4 belongs to TI's legacy FET-input op-amp family, engineered for cost-effective, high-reliability signal conditioning in power conversion, motor control, and energy infrastructure systems.

FAQ

What is the maximum capacitive load the TL084QDRG4 can drive while maintaining stability?

The TL084QDRG4 is characterized to drive up to 300 pF capacitive loads with ≥56° phase margin at unity gain, per TI's SLOS081O datasheet Section 5.7. This enables direct connection to ADC input capacitors or long PCB traces without external isolation resistors. For loads exceeding 300 pF, a series resistor (≥10 Ω) between the TL084QDRG4 output and the capacitance is recommended to preserve stability in motor drive current-sense applications.

Does the TL084QDRG4 support single-supply operation?

Yes, the TL084QDRG4 supports single-supply operation from 4.5 V to 40 V, with common-mode input range extending down to (VCC–) + 1.5 V and up to VCC+. When operated on single supply (e.g., +12 V with VCC– = 0 V), the input must remain ≥1.5 V above ground, and output swing is limited to ~105–215 mV from each rail. Designers commonly use a mid-rail virtual ground (e.g., VREF = 6 V) to maximize dynamic range in sensor interfaces using TL084QDRG4.

How does the TL084QDRG4's ESD rating compare to standard industry requirements?

The TL084QDRG4 features ±1500 V HBM (Human Body Model) ESD rating per ANSI/ESDA/JEDEC JS-001, exceeding the 500 V minimum required for safe manufacturing per JEDEC JEP155. Its integrated EMI/RF filters further enhance system-level robustness against electrostatic discharge events in field-deployed solar inverters and industrial UPS units, reducing susceptibility to latch-up or parametric shift during handling or operation.

Can the TL084QDRG4 replace the TL084CP in existing designs?

TL084QDRG4 is not a direct drop-in replacement for TL084CP due to differences in temperature grade (QDRG4: –40°C to +125°C; CP: 0°C to 70°C), offset voltage (QDRG4: ±1 mV typ vs CP: ±3 mV typ), and EMI filtering (QDRG4 includes integrated filters; CP does not). While pinout and SOIC-14 package are identical, redesign validation is required for thermal, noise, and EMC performance in mission-critical applications like solar inverters where TL084QDRG4 is specified.

What is the typical quiescent current per channel for TL084QDRG4 at ±15 V supply?

At ±15 V supply and TA = 25°C, the TL084QDRG4 draws 937.5–1125 μA per amplifier (3.75–4.5 mA total), per Section 5.7 of the SLOS081O datasheet. This value increases to ~1130 μA/ch at +125°C. The low IQ enables use in thermally constrained UPS control boards and battery-backed solar monitoring modules where standby power budgets are tight.