Texas Instruments OPA820IDG4

Overview

OPA820IDG4 from Texas Instruments is a unity-gain stable, low-noise voltage-feedback operational amplifier in an 8-pin SOIC package. It delivers 240 MHz small-signal bandwidth at G = 2, 2.5 nV/√Hz input voltage noise, ±110 mA output current, and operates from ±2.5 V to ±6 V or single 5 V to 12 V supplies - enabling high-fidelity ADC preamplification in portable test equipment.

For engineers reviewing the OPA820IDG4 datasheet, OPA820IDG4 pinout, OPA820IDG4 application, or OPA820IDG4 equivalent, key selection criteria include its 800-MHz unity-gain bandwidth with <1-dB peaking, differential gain/phase of 0.01%/0.03° for composite video, rail-compatible 2-VPP swing on 5-V supply, and industrial-temperature (–45°C to +85°C) operation with full DC specifications.

Technical Context

The OPA820IDG4 employs a voltage-feedback architecture optimized for unity-gain stability without external compensation. Its 5.6-mA quiescent current enables high-speed performance while maintaining excellent DC precision: ±750 µV max input offset voltage and ±400 nA max input offset current at 25°C.

It supports dual-supply (±2.5 V to ±6 V) and single-supply (5 V to 12 V) operation, with input common-mode range extending to ±4 V (±5-V supply) and output swing to ±3.7 V (no load). The device achieves 0.02% settling in 22 ns and –95 dBc third-harmonic distortion at 1 MHz with 2-VPP output into ≥500 Ω.

Key Specifications

Pinout & Package

OPA820IDG4 is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Pin functions are validated per TI SBOS303D Rev D.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-feedback op amp applications.

Compared with OPA2822IDR and OPA657U, the OPA820IDG4 uniquely balances 240-MHz bandwidth, 2.5-nV/√Hz noise, ±110-mA drive, and 5.6-mA power in a single-channel SOIC - making it optimal for high-fidelity, moderate-bandwidth analog front-ends where thermal and layout simplicity are critical.

Availability

OPA820IDG4 is available at Aetrix Electronics and suitable for ADC preamplifiers, composite video line drivers, and active filters requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.

Supply support for OPA820IDG4 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 company specializing in analog and embedded processing technologies, with leadership in high-performance op amps, data converters, and power management ICs.

The OPA820IDG4 belongs to TI's precision high-speed op amp product line, engineered for applications demanding low noise, wide bandwidth, and robust DC accuracy - particularly in test & measurement, imaging, and video infrastructure.

FAQ

What is the maximum operating temperature range for the OPA820IDG4?

The OPA820IDG4 is fully specified over the industrial temperature range of –45°C to +85°C. Electrical characteristics including input offset voltage (±1.2 mV max), input offset current (±700 nA max), and small-signal bandwidth (155 MHz min at G = 2) are guaranteed across this range, making it suitable for harsh-environment instrumentation and automotive under-hood sensing applications.

Does the OPA820IDG4 require external compensation for unity-gain operation?

No, the OPA820IDG4 is unity-gain stable by design and does not require external compensation. It achieves >800-MHz bandwidth at G = 1 with less than 1-dB peaking, verified per TI SBOS303D test conditions. This eliminates the need for feedback capacitors or resistor networks typically used with decompensated op amps.

Can the OPA820IDG4 operate from a single 5-V supply?

Yes, the OPA820IDG4 supports single-supply operation from 5 V to 12 V. At VS = 5 V, it delivers 230-MHz small-signal bandwidth (G = 2), 2.8 nV/√Hz input noise, and 2-VPP output swing into high-impedance loads - enabling direct interface with 5-V microcontrollers and 12-bit+ ADCs without level-shifting circuitry.

What is the input common-mode voltage range for the OPA820IDG4 with ±5-V supplies?

With ±5-V supplies, the OPA820IDG4 has a common-mode input range of ±3.6 V to ±4.0 V (min to max, –40°C to +85°C). This allows direct interfacing with signals centered at ground or referenced to mid-supply, and supports rail-to-rail input capability in many configurations - though not full rail-to-rail due to internal transistor headroom limitations.

How does the OPA820IDG4 compare to the OPA620 in video line-driving applications?

The OPA820IDG4 improves upon the OPA620 with lower input voltage noise (2.5 vs. 3.8 nV/√Hz), higher output current (±110 vs. ±65 mA), and superior video specifications: 0.01% dG / 0.03° dP versus 0.02% / 0.05°. Both are unity-gain stable, but the OPA820IDG4 achieves this at lower quiescent current (5.6 mA vs. 7.5 mA), enhancing thermal performance in dense layouts.