Texas Instruments THS4021CDGNG4

Overview

THS4021CDGNG4 from Texas Instruments is a single-channel, ultra-low-noise (1.2 nV/√Hz), high-speed voltage-feedback operational amplifier optimized for gain ≥10 V/V stable operation. It delivers 290 MHz small-signal bandwidth, 470 V/μs slew rate, and 30 ns settling time (0.1%) at G = 10, with ±15 V supply capability and offset nulling pins - enabling precision signal conditioning in ultrasound front-ends and source measurement units.

For engineers reviewing the THS4021CDGNG4 datasheet, THS4021CDGNG4 pinout, THS4021CDGNG4 application, or THS4021CDGNG4 equivalent, key selection criteria include voltage noise floor, closed-loop stability at high gain, output drive into 150 Ω, THD performance at 1 MHz, and thermal resistance (R_θJA = 58.4 °C/W) in the HVSSOP-8 package.

Technical Context

The THS4021CDGNG4 employs a voltage-feedback architecture with internal compensation tailored for minimum-phase stability at gains ≥10 V/V (or ≤–9 V/V), eliminating external compensation in most high-gain wideband designs. Its input stage uses a low-noise bipolar topology, while the output stage supports ±200 mA peak current into low-impedance loads without clipping under ±15 V supplies.

It features dedicated NULL pins (Pins 1 & 8) for manual offset voltage trimming, enabling sub-millivolt DC accuracy in precision analog chains. The device operates across dual supplies from ±4.5 V to ±16 V and maintains <–68 dBc THD at 1 MHz with 2 V_PP output into 150 Ω - critical for high-fidelity signal generation and acquisition.

Key Specifications

Pinout & Package

The THS4021CDGNG4 is housed in an 8-pin HVSSOP (DGN) package - thermally enhanced, surface-mount, 3.0 mm × 3.0 mm footprint with exposed thermal pad - optimized for high-speed layout and power dissipation in dense PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4021CDGNG4, THS4031CDGNR offers higher bandwidth at slightly elevated noise, while OPA695IDGNR provides greater gain-bandwidth but sacrifices offset control and introduces layout redesign due to incompatible pinout and lack of NULL functionality.

Availability

THS4021CDGNG4 is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, source measurement units, and power quality meters requiring stable component supply, long-term manufacturability, and guaranteed traceability.

Supply support for THS4021CDGNG4 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 THS402x family was designed specifically for demanding wideband, low-noise applications such as medical imaging and automated test equipment - prioritizing voltage noise, settling speed, and gain stability over unity-gain versatility.

FAQ

What is the maximum recommended supply voltage for THS4021CDGNG4?

The absolute maximum supply voltage for THS4021CDGNG4 is ±16.5 V (33 V total). However, the recommended operating range is ±4.5 V to ±16 V. Operating at ±16 V is permissible and supported by all published specifications including 290 MHz bandwidth and 470 V/μs slew rate - but thermal design must account for increased power dissipation at maximum rails.

Does THS4021CDGNG4 require external compensation for G = 10 operation?

No, THS4021CDGNG4 is internally compensated and specified for stable operation at closed-loop gains ≥10 V/V (and ≤–9 V/V) without any external components. This eliminates phase-margin tuning and simplifies layout - confirmed by measured 290 MHz bandwidth and 30 ns settling time at G = 10 in the official datasheet.

How is offset voltage trimmed on THS4021CDGNG4?

THS4021CDGNG4 provides two dedicated NULL pins (Pins 1 and 8) for manual offset adjustment. A 10-kΩ potentiometer is connected with its ends to Pins 1 and 8 and its wiper to Pin 1. Adjusting the wiper trims input offset voltage to typically <0.3 mV - a feature not present in many competing high-speed op-amps like OPA695.

What load impedance can THS4021CDGNG4 drive while maintaining 0.1% settling in 30 ns?

THS4021CDGNG4 achieves 30 ns (0.1%) settling time driving a 150 Ω load with ±15 V supplies and G = 10 configuration. At this load, it delivers ±13.5 V output swing with <–68 dBc THD. For heavier loads (e.g., 50 Ω), settling degrades to ~40 ns and output swing compresses - verify timing margins in final layout with actual trace capacitance.

Is THS4021CDGNG4 suitable for single-supply operation?

Yes, THS4021CDGNG4 supports single-supply operation from 9 V to 33 V. Its input common-mode range extends to within 1.2 V of each rail (e.g., 1.2 V to 31.8 V at V_CC = 33 V), and output swings to within 1.5 V of each rail into 1 kΩ. For true rail-to-rail input/output, a different amplifier family would be required - THS4021CDGNG4 is optimized for dual-supply high-fidelity signal paths.