Texas Instruments THS4211D

Overview

THS4211D from Texas Instruments is a unity-gain stable, voltage-feedback operational amplifier optimized for high-linearity signal conditioning in wideband analog systems. It delivers 970 V/µs slew rate, 1 GHz small-signal bandwidth (±5 V), –90 dBc THD at 30 MHz, and 130-MHz 0.1-dB flat bandwidth (G = 2), enabling use as an ADC preamplifier or DAC output buffer in precision data acquisition systems.

For engineers reviewing the THS4211D datasheet, THS4211D pinout, THS4211D application, or THS4211D equivalent, key selection criteria include its low distortion at high frequencies, ±5 V to ±7.5 V dual-supply operation, SOIC-8 package compatibility, and verified performance in video and RF signal chain stages requiring <0.007% differential gain error.

Technical Context

The THS4211D employs a voltage-feedback architecture with internal compensation for unconditional unity-gain stability. Its high slew rate and wide bandwidth stem from optimized transconductance and low-output-impedance stages, supporting fast settling (22 ns to 0.1%) without peaking in G ≥ 1 configurations.

It operates across ±2.5 V to ±7.5 V dual supplies or 5 V to 15 V single supply, with input common-mode range extending to within 1.2 V of rails and output swing to ±3.6 V (±5 V supply). Input voltage noise is 7 nV/√Hz at 1 MHz, and harmonic distortion is specified down to –100 dBc (HD3, RL = 499 Ω, f = 30 MHz, G = 1).

Key Specifications

Pinout & Package

THS4211D is housed in an 8-pin SOIC (D) package with exposed pad thermal enhancement. Pin 1 is NC (no connection); pins 2–5 and 7–8 are functional; pin 6 is VOUT. Thermal design requires soldering the exposed pad to a PCB ground plane per TI SLMA002 guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed voltage-feedback amplifier applications.

Compared with THS4215DRBT, THS4211D offers lower quiescent current and eliminates PD pin routing complexity; versus LMH6629MA/NOPB, it provides guaranteed unity-gain stability at the cost of slightly higher input noise-critical for precision buffer and ADC driver roles.

Availability

THS4211D is available at Aetrix Electronics and suitable for high-speed data acquisition, broadcast video infrastructure, and RF instrumentation requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for THS4211D 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 over 50 years of innovation in high-performance signal chain components.

The THS4211D belongs to TI's high-speed voltage-feedback amplifier product line, engineered for applications demanding wide bandwidth, ultra-low distortion, and rail-to-rail output drive in test & measurement, medical imaging, and communications infrastructure.

FAQ

What is the maximum operating supply voltage for THS4211D?

The THS4211D supports dual supplies from ±2.5 V to ±7.5 V and single supplies from 5 V to 15 V. Absolute maximum supply voltage is ±8.25 V (16.5 V total), but operation beyond ±7.5 V risks exceeding specified AC performance and thermal limits. For reliable long-term operation, TI recommends staying within ±7.5 V or 15 V single supply as defined in Recommended Operating Conditions.

Does THS4211D require external compensation for unity-gain stability?

No, THS4211D is internally compensated for unconditional unity-gain stability. It remains stable with gain ≥1 in standard inverting or non-inverting configurations without added feedback capacitors or resistive isolation. This eliminates tuning effort and layout sensitivity, making THS4211D ideal for buffer and gain-of-two video line drivers where phase margin must exceed 45° across temperature and process variation.

What is the typical harmonic distortion performance of THS4211D at 70 MHz?

At 70 MHz, THS4211D delivers –53 dBc third-order intermodulation distortion (IMD3) and 32 dBm third-order output intercept point (OIP3) under G = 2, VO = 2 VPP, RL = 150 Ω, ±5 V supply conditions. Second-harmonic distortion is –68 dBc under identical conditions. These values confirm suitability for IF amplification in LTE and WiMAX receiver chains where adjacent-channel leakage ratio (ACLR) compliance is critical.

Can THS4211D drive a 50-Ω load directly?

Yes, THS4211D can drive a 50-Ω load directly: it sources up to 220 mA and sinks 170 mA (min) at ±5 V, supporting ±3.6 V output swing into 50 Ω. However, for optimal distortion and thermal performance, TI recommends using a series 25-Ω isolating resistor (RISO) when driving reactive or long-cable loads, as shown in Figure 24 of the SLOS400E datasheet. Without RISO, capacitive loading >10 pF may degrade stability.

Is the THS4211D pin-compatible with THS4215D?

Yes, THS4211D and THS4215D share identical pinout and package (SOIC-8), but THS4215D adds a power-down (PD) pin at position 1 (replacing NC on THS4211D). In THS4211D, pin 1 is NC and must remain unconnected; in THS4215D, pin 1 is PD and defaults to enabled if left floating. Thus, THS4211D cannot be substituted for THS4215D in PD-enabled designs, but THS4215D may operate as a drop-in replacement for THS4211D if PD is tied high or low per datasheet logic levels.