Texas Instruments OPA828IDGNT

Overview

OPA828IDGNT from Texas Instruments is a single-channel, JFET-input operational amplifier optimized for high-precision, low-noise signal conditioning in demanding analog front ends. It delivers 45 MHz gain bandwidth, 150 V/µs slew rate, and 60 nV_RMS (0.1–10 Hz) input voltage noise - enabling 14-bit settling in 120 ns. Its ±25 µV max offset voltage and 0.2 µV/°C drift support stable DC-coupled measurement in lab instrumentation and ultrasound scanner receive chains.

For engineers reviewing the OPA828IDGNT datasheet, OPA828IDGNT pinout, OPA828IDGNT application, or OPA828IDGNT equivalent, key selection criteria include its HVSSOP-8 thermal performance, MUX-friendly inputs with no phase reversal, and compatibility with ±4 V to ±18 V dual supplies in high-impedance sensor interfaces requiring sub-100 nV/√Hz noise at 1 kHz.

Technical Context

The OPA828IDGNT implements a laser-trimmed JFET input stage on a high-voltage SiGe-complementary process, enabling simultaneous precision DC performance and wideband AC response. Its internal phase-reversal protection eliminates output inversion when inputs exceed common-mode limits, while the overload power limiter safeguards against sustained overdrive.

It features a fully differential input architecture with >10¹² Ω || 9 pF common-mode impedance and 13.5 Ω open-loop output impedance at 1 MHz. The device operates with 5.5 mA typical quiescent current per channel and supports capacitive loads up to 30 pF without external compensation in unity-gain stable configuration.

Key Specifications

Pinout & Package

OPA828IDGNT is housed in an 8-pin HVSSOP (DGN) package with exposed thermal pad. This thermally enhanced package achieves 56.7°C/W junction-to-ambient resistance and requires soldering the thermal pad to a ground or negative supply plane for optimal thermal performance and input leakage control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, low-noise op-amp applications.

Compared with OPA828IDGNT, OPA827ID trades thermal performance and drift for SOIC compatibility, while ADA4625-1 prioritizes speed over sub-100 nV/√Hz noise - making OPA828IDGNT the optimal choice for DC-stable, low-noise, thermally constrained precision analog front ends.

Availability

OPA828IDGNT is available at Aetrix Electronics and suitable for data acquisition systems, ultrasound scanners, lab instrumentation, and optical module designs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for OPA828IDGNT 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 expertise in high-performance op-amps and precision signal-chain solutions.

The OPAx828 product line was designed specifically for high-resolution, low-drift, low-noise analog signal conditioning in test & measurement, medical imaging, and industrial sensing applications where DC accuracy and wideband fidelity must coexist.

FAQ

What is the maximum capacitive load the OPA828IDGNT can drive without instability?

The OPA828IDGNT is unity-gain stable and can drive up to 30 pF capacitive load with minimal overshoot (<8%) and 57° phase margin under standard test conditions (VO = 10 mVPP, CL = 30 pF). For heavier loads, external isolation resistors (e.g., 25 Ω in series with output) restore stability without degrading 14-bit settling time. This capability simplifies layout in ADC driver and cable-driving applications where stray capacitance exceeds 20 pF.

Does the OPA828IDGNT require external compensation for gain-of-10 operation?

No, the OPA828IDGNT does not require external compensation for gain-of-10 operation. Its internal compensation ensures stability across all gains ≥ 1, including G = 10, with measured phase margin >57° and closed-loop bandwidth matching theoretical GBW/10 ≈ 4.5 MHz. This eliminates the need for external capacitors or feedback network adjustments in fixed-gain instrumentation amplifier stages using OPA828IDGNT.

How does the thermal pad on the OPA828IDGNT package affect electrical performance?

The thermal pad on the OPA828IDGNT is electrically isolated (>10 MΩ) from the die but must be soldered to V− or ground to minimize input leakage current. Leaving it floating increases input bias current by up to 10× due to surface contamination paths. TI specifies tying the pad to V− for optimal 0.1 pA bias current performance and reduced 0.1–10 Hz noise coupling - a requirement confirmed in the PowerPAD Design Considerations section of the SBOS671D datasheet.

Can the OPA828IDGNT operate from a single 12-V supply?

Yes, the OPA828IDGNT supports single-supply operation from 8 V to 36 V, including 12 V. With V+ = 12 V and V− = 0 V, its input common-mode range extends from +2.5 V to +8.5 V, and output swings within 1.2 V of each rail (0.9–11.1 V) into 10 kΩ. This allows use in automotive body-control modules and industrial PLC analog I/O where only a single positive rail is available - provided input signals remain within the validated CM range.

What is the overload recovery time specification for the OPA828IDGNT?

The OPA828IDGNT recovers from output saturation in 55 ns (typical) when configured with G = –10, as measured from the end of overload to within 0.0244% (12-bit) of final value. This fast recovery is enabled by its internal overload power limiter and robust JFET input stage, making it suitable for multiplexed sensor systems where rapid channel switching demands minimal settling delay after transient overloads - a key advantage over older OPA627-based designs.