Texas Instruments OPA892DR

Overview

OPA892DR from Texas Instruments is a single-channel, decompensated voltage-feedback operational amplifier optimized for high-fidelity signal amplification at gains ≥10 V/V. It delivers 2 GHz gain-bandwidth product, 700 V/µs slew rate, and ultra-low 0.95 nV/√Hz input voltage noise - enabling precision low-distortion performance in ultrasound front-ends, source measurement units, and professional audio line drivers.

For engineers reviewing the OPA892DR datasheet, OPA892DR pinout, OPA892DR application, or OPA892DR equivalent, this page provides verified specifications, SOIC-8 pin mapping with offset-nulling terminals, real-world THD+N (–114 dBc at 1 kHz), thermal derating guidance, and validated alternatives for gain-stable, low-noise wideband amplification.

Technical Context

The OPA892DR uses a >30-V complementary bipolar process with multi-GHz f_T transistors to achieve its decompensated architecture - intentionally shifting the dominant pole to enable 290 MHz small-signal bandwidth at G = 10 while maintaining stability only at gains ≥10 V/V or ≤–9 V/V. Its internal compensation prioritizes speed over unity-gain stability.

This architecture enables simultaneous high slew rate (700 V/µs), fast settling (30 ns to 0.1%), and low harmonic distortion (–78 dBc at 1 MHz) without sacrificing output drive (200 mA typical into 150 Ω). Offset nulling pins (1 & 8) support fine-tuning of input offset voltage down to sub-millivolt levels in critical DC-coupled paths.

Key Specifications

Pinout & Package

OPA892DR is housed in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed pad not present. Thermal resistance R_θJA = 124.5°C/W reflects standard PCB layout with minimal copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-noise operational amplifier applications.

Compared with OPA892DR, OPA891DR trades gain stability for reduced bandwidth and slew rate, while LMH6629MA/NOPB offers unity-gain operation at the cost of doubled input voltage noise - making OPA892DR uniquely optimal for fixed high-gain, ultra-low-noise, wideband amplification.

Availability

OPA892DR is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, source measurement units, and professional audio line drivers requiring stable component supply, long-term lifecycle assurance, and traceable TI manufacturing.

Supply support for OPA892DR 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 OPAx892 family was designed specifically for demanding wideband, low-distortion applications including medical imaging, automated test equipment, and professional audio - where simultaneous high speed, low noise, and high output drive are non-negotiable.

FAQ

What is the minimum stable gain for OPA892DR?

The OPA892DR is decompensated and guaranteed stable only at closed-loop gains of ≥10 V/V (noninverting) or ≤–9 V/V (inverting). Attempting unity-gain or G = 2 operation will cause oscillation. For lower-gain applications, TI recommends the OPA891DR - a unity-gain stable variant sharing the same noise performance.

Does OPA892DR support single-supply operation?

Yes, OPA892DR supports single-supply operation from 9 V to 36 V. Input common-mode range extends to within 1.2 V of each rail (e.g., 1.2 V to 34.8 V at V_CC = 36 V), and output swing reaches within 1.1 V of each rail under light load. Proper level-shifting and biasing of inputs are required for DC-coupled single-supply use.

How do I use the offset null pins on OPA892DR?

Pins 1 and 8 are offset null terminals. Connect a 10-kΩ potentiometer between them, and tie the wiper to VCC–. Adjusting the potentiometer changes the internal current balance to reduce input offset voltage - typically trimming from 0.2–1 mV down to <0.3 mV. Do not float either pin; unused null pins must be tied together if not actively trimmed.

Can OPA892DR drive a 75-Ω coaxial cable directly?

Yes - with proper isolation. Due to its high bandwidth and sensitivity to capacitive loading, place a 75-Ω series resistor at the OPA892DR output before the cable. This isolates the amplifier from cable capacitance (>10 pF), prevents peaking/oscillation, and matches source impedance for minimal reflections. The OPA892DR's 200 mA drive capability sustains this configuration up to ±12 V swing.

What is the thermal performance of OPA892DR in SOIC-8?

In standard JEDEC 2-layer board layout, OPA892DR (SOIC-8) has R_θJA = 124.5°C/W. At 7.5 mA supply current and ±15 V rails, dissipation is ~0.225 W - resulting in ~28°C junction rise above ambient. For continuous 200 mA output into 150 Ω, power dissipation exceeds 1.5 W; forced air or thermal vias under the package are strongly recommended to maintain T_J < 125°C.