Texas Instruments THS4221DR

Overview

THS4221DR from Texas Instruments is a single-channel, rail-to-rail output, high-speed voltage-feedback operational amplifier optimized for low-distortion signal conditioning in data converter interfaces and video systems. It delivers 230 MHz bandwidth (G = 1), 975 V/µs slew rate, −90 dBc HD2 at 5 MHz, ±4.8 V output swing into 2 kΩ, and operates from ±1.35 V to ±7.5 V or 2.7 V to 15 V supplies.

For engineers reviewing the THS4221DR datasheet, THS4221DR pinout, THS4221DR application, or THS4221DR equivalent, this page provides verified technical context, package-specific pin definitions, real-world use cases in ADC driving and active filtering, and two validated alternative parts with documented functional trade-offs.

Technical Context

The THS4221DR implements a voltage-feedback architecture with a rail-to-rail output stage enabling full dynamic range utilization across supply voltages as low as ±1.35 V. Its 230 MHz small-signal bandwidth and 975 V/µs slew rate support fast transient response in unity-gain stable configurations without external compensation.

It features a 33 MΩ input resistance, 1 pF common-mode input capacitance, and maintains −90 dBc second-harmonic distortion at 5 MHz with 2 V_PP output into 499 Ω - confirming suitability for precision analog front-ends where spectral purity is critical.

Key Specifications

Pinout & Package

The THS4221DR is supplied in the SOIC-8 (D) package, a standard 150-mil wide surface-mount outline with gull-wing leads and 1.27-mm pitch. Thermal resistance Θ_JA = 97.5°C/W enables reliable operation up to 85°C ambient with standard PCB copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA354AIDBVR and THS4271DR, the THS4221DR occupies a balanced niche: it delivers 230-MHz bandwidth and −90-dBc distortion at 14 mA, making it optimal for 10–100-MHz ADC drivers and video buffers where power, speed, and distortion must coexist without compromise.

Availability

THS4221DR is available at Aetrix Electronics and suitable for high-speed data acquisition, video signal conditioning, and active filter design requiring stable component supply across industrial temperature ranges and multi-year production cycles.

Supply support for THS4221DR 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, embedded processing, and connectivity technologies with over 50 years of innovation in high-performance signal chain components.

The THS4221DR belongs to TI's THS422x family of rail-to-rail output, low-distortion op-amps engineered specifically for high-fidelity analog front-ends in data converters, video infrastructure, and instrumentation systems.

FAQ

What is the maximum output voltage swing of the THS4221DR under typical conditions?

The THS4221DR delivers a minimum output voltage swing of −4.8 V to +4.8 V into a 2-kΩ load with ±5-V supplies, and −4.7 V to +4.7 V into 499 Ω. This rail-to-rail capability ensures >96% supply utilization, critical for maximizing dynamic range in ADC driver applications where headroom directly impacts SNR.

Does the THS4221DR support single-supply operation, and what is its minimum usable supply voltage?

Yes, the THS4221DR supports true single-supply operation from 2.7 V to 15 V. Its input common-mode range extends from VS− + 1.1 V to VS+ − 1.1 V, and output swings to within 100 mV of each rail - enabling robust 3.3-V or 5-V system integration without level-shifting circuitry.

What is the harmonic distortion performance of the THS4221DR at 5 MHz, and how does it impact ADC interface design?

At 5 MHz with 2-V_PP output into 499 Ω, the THS4221DR achieves HD2 = −90 dBc and HD3 = −100 dBc. This low distortion preserves SFDR in 12–14-bit ADC interfaces, preventing harmonic folding that would degrade ENOB - especially critical in undersampled or IF-sampling architectures.

Is the THS4221DR pin-compatible with other devices in the THS422x family, such as the THS4225DR?

No - the THS4221DR (non-power-down) uses an SOIC-8 pinout with NC pins at positions 1, 5, and 8, whereas the THS4225DR (power-down version) substitutes pin 5 with PD and pin 1 with REF. These functional differences require PCB layout changes; they are not drop-in replacements.

What decoupling is recommended for stable high-frequency operation of the THS4221DR?

Texas Instruments specifies 0.1-µF ceramic capacitors placed within 5 mm of both VS+ and VS− pins, plus a 6.8-µF bulk capacitor nearby. This dual-stage decoupling maintains PSRR > 60 dB up to 10 MHz and suppresses supply-induced oscillation in unity-gain configurations above 100 MHz.