Texas Instruments THS4042IDR

Overview

THS4042IDR from Texas Instruments is a dual-channel, high-speed voltage-feedback operational amplifier optimized for driving capacitive loads up to 1000 pF while maintaining stability. It delivers 165 MHz bandwidth (−3 dB, CL = 0 pF), 400 V/µs slew rate, ±15 V supply operation, and drives 100 mA into 20 Ω - enabling use in video line drivers, ADC buffers, and high-fidelity signal conditioning circuits.

For engineers reviewing the THS4042IDR datasheet, THS4042IDR pinout, THS4042IDR application, or THS4042IDR equivalent, key selection criteria include unity-gain stability with any capacitive load, differential gain/phase error of 0.01% / 0.01° (NTSC, ±15 V), low THD (−89 dBc at 1 MHz, RL = 1 kΩ), and SOIC-8 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The THS4042IDR employs a dielectrically isolated complementary bipolar process enabling GHz f_T transistors, delivering wide bandwidth and fast settling (120 ns to 0.1%, 250 ns to 0.01%). Its internal C-stable compensation dynamically adjusts dominant pole response based on capacitive load, eliminating external compensation in most configurations.

It supports both inverting and noninverting gains ≥1 with full stability, features independent dual amplifiers with −64 dB channel-to-channel crosstalk at 1 MHz, and maintains low distortion across ±5 V to ±15 V dual supplies - making it suitable for precision analog front-ends where load variability and signal integrity are critical.

Key Specifications

Pinout & Package

THS4042IDR is housed in an 8-pin SOIC (D) package with exposed thermal pad (PowerPAD™). The package supports standard reflow profiles and provides enhanced thermal dissipation (θ_JA = 167°C/W on JEDEC Low-K board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4042IDR, THS4032IDR trades load adaptability for lower noise and THS4042IDR's C-stable architecture enables plug-and-play integration in variable-load video and data acquisition systems, while OPA2691IDR offers raw speed at the expense of supply flexibility and distortion performance at baseband frequencies.

Availability

THS4042IDR is available at Aetrix Electronics and suitable for video line driving, high-speed ADC buffering, and medical imaging signal conditioning requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for THS4042IDR 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 solutions, with decades of expertise in high-performance op-amps and precision signal chains.

The THS4042IDR belongs to TI's C-Stable high-speed op-amp family, engineered specifically for applications demanding unconditional stability into unpredictable or widely varying capacitive loads - especially video, test equipment, and real-time data acquisition.

FAQ

What is the maximum capacitive load THS4042IDR can drive without external compensation?

The THS4042IDR is rated for stable operation with up to 1000 pF of capacitive load without external compensation, thanks to its internal C-stable architecture. At CL = 1000 pF, it retains 35 MHz bandwidth (−3 dB) and exhibits controlled overshoot (<15%) in step response. For loads exceeding 1000 pF, a series isolation resistor (≥20 Ω) is recommended to maintain phase margin. This behavior is verified in the THS4042IDR datasheet Figure 24 and application note SLOA013.

Does THS4042IDR support single-supply operation?

Yes, THS4042IDR supports single-supply operation from 9 V to 33 V, as specified in the "recommended operating conditions" table of the THS4042IDR datasheet. When used in single-supply mode, the input common-mode range extends from 0 V to V_CC − 1.2 V, and output swing reaches within 1.5 V of each rail. Designers must bias inputs appropriately and ensure proper decoupling - the THS4042IDR does not include rail-to-rail input or output stages.

What is the channel-to-channel crosstalk specification for THS4042IDR?

The THS4042IDR specifies −64 dB channel-to-channel crosstalk at 1 MHz under conditions of V_CC = ±5 V or ±15 V, gain = 2, and R_F = 2.7 kΩ (datasheet Table on page 4). This level of isolation ensures minimal interference between dual signal paths in applications like stereo audio processing or differential sensor readout, and is measured with one channel driven while the other is monitored at its output.

How does THS4042IDR achieve unity-gain stability with any capacitive load?

The THS4042IDR achieves unity-gain stability through proprietary internal compensation circuitry that senses output capacitive loading and dynamically adjusts the dominant pole frequency. Unlike conventional op-amps requiring external feedback capacitors or isolation resistors, this C-stable architecture maintains ≥45° phase margin across 0–1000 pF loads at gain = 1. The mechanism is detailed in the THS4042IDR application information section (page 16) and validated via frequency response plots in Figures 6–11.

Is THS4042IDR pin-compatible with THS4041IDR?

No, THS4042IDR is not pin-compatible with THS4041IDR. While both share the same SOIC-8 (D) package footprint, their pin functions differ: THS4041IDR uses Pins 1 and 8 for offset nulling, whereas THS4042IDR uses all eight pins for dual-amplifier I/O (1OUT, 1IN−, 1IN+, VCC−, VCC+, 2OUT, 2IN−, 2IN+). Substituting one for the other without PCB revision will result in incorrect connections and functional failure.