Texas Instruments THS3201D

Overview

THS3201D from Texas Instruments is a 1.8-GHz current-feedback amplifier (CFA) optimized for wideband, low-distortion signal conditioning in ±7.5 V systems. It delivers 6700 V/µs slew rate (G = 2, 10-V step), –78 dBc IMD3 at 20 MHz, 1.65 nV/√Hz input voltage noise, and 100 mA output drive into 100 Ω - enabling high-fidelity arbitrary waveform generation and high-resolution ADC/DAC buffering.

For engineers reviewing the THS3201D datasheet, THS3201D pinout, THS3201D application, or THS3201D equivalent, key selection criteria include its current-feedback architecture, ±3.3 V to ±7.5 V dual-supply operation, SOIC-8 package thermal performance (θJA = 97.5°C/W), and verified distortion performance across gain configurations up to G = 10.

Technical Context

The THS3201D employs a current-feedback topology with transimpedance gain of 300 kΩ (typ), enabling bandwidth scaling independent of closed-loop gain. Its inverting input presents low impedance (~11 Ω), while noninverting input offers high impedance (~780 kΩ), supporting precise gain-setting via external feedback resistors (e.g., RF = 768 Ω for G = 2).

Distortion suppression relies on symmetrical current mirrors and optimized biasing: third-order intermodulation remains –78 dBc at 20 MHz (G = 10, 2-VPP envelope), and differential gain/phase errors are 0.004% and 0.011° (PAL, RL = 150 Ω), confirming suitability for video and precision instrumentation signal paths.

Key Specifications

Pinout & Package

THS3201D is housed in an 8-pin SOIC (D package) with exposed pad thermal enhancement. Pin 1 is IN–, Pin 2 is IN+, Pin 3 is VOUT, Pin 4 is VS+, Pin 5 is VS–, and Pins 6–8 are NC (no internal connection). The PowerPAD™ underside must be soldered to a thermally conductive PCB plane to maintain junction temperature ≤125°C under full load.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-feedback amplifier applications.

Compared with OPA695 and THS3202, THS3201D uniquely supports ±7.5 V operation in a single-channel SOIC-8 package with industry-leading 1.8-GHz bandwidth and –78 dBc IMD3 - making it optimal for legacy high-voltage test equipment upgrades and high-fidelity signal chain designs.

Availability

THS3201D is available at Aetrix Electronics and suitable for test equipment signal conditioning, high-speed data converter buffering, and ATE channel amplification requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for THS3201D 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 amplifiers and precision signal-chain solutions.

The THS3201D belongs to TI's high-speed current-feedback amplifier product line, engineered specifically for wideband, low-distortion applications in test and measurement, ATE, and high-resolution data acquisition systems.

FAQ

What is the maximum recommended supply voltage for THS3201D?

The absolute maximum supply voltage for THS3201D is ±8.25 V, but the recommended operating range is ±3.3 V to ±7.5 V. Operating at ±7.5 V enables full 10-VPP output swing into 100 Ω and achieves the specified 1.8-GHz unity-gain bandwidth and –78 dBc IMD3. Exceeding ±7.5 V risks exceeding absolute maximum ratings and may degrade long-term reliability.

Does THS3201D require external compensation for stability?

THS3201D does not require external compensation capacitors for standard gain configurations (G ≥ 1), but stability depends on proper layout and feedback resistor selection. For G = 2, RF = 768 Ω is recommended; capacitive loads >10 pF require series isolation resistance (RISO) per Figure 7 in the datasheet. The SOIC-8 PowerPAD™ must be thermally anchored to avoid thermal runaway that could destabilize bias points.

How does THS3201D perform in single-supply operation?

THS3201D is specified for dual-supply operation only (±3.3 V to ±7.5 V). It is not characterized for true single-supply use (e.g., 0 V to +15 V), as its input common-mode range is limited to ±5.1 V at ±7.5 V supplies and its output cannot swing to rail. Attempting single-supply operation risks input stage saturation, increased distortion, and potential damage if the negative supply pin is tied to ground without proper level-shifting circuitry.

What is the thermal resistance (θJA) of THS3201D in SOIC-8 package?

The THS3201D in SOIC-8 (D package) has a junction-to-ambient thermal resistance (θJA) of 97.5°C/W when mounted on a JEDEC-standard High-K test PCB. With proper PowerPAD™ soldering to a 2-in² copper pour, actual θJA can improve to ~65°C/W in production layouts. At maximum quiescent current (21 mA) and ±7.5 V supplies, power dissipation is ~315 mW - requiring thermal design to keep TJ ≤125°C for rated performance.

Can THS3201D drive 50-Ω transmission lines directly?

Yes, THS3201D can drive 50-Ω loads directly, delivering ±5.8 V swing (11.6 VPP) at ±7.5 V supplies with 100 mA sourcing/sinking capability. However, for optimal signal integrity, a series 50-Ω resistor should be placed at the amplifier output to match the line impedance and suppress reflections - especially critical for rise times <1 ns. The amplifier's 0.01 Ω closed-loop output impedance ensures minimal loss across the matching network.