Texas Instruments THS4042CDRG4

Overview

THS4042CDRG4 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 small-signal bandwidth (±15 V, CL = 0 pF), 400 V/µs slew rate, ±100 mA output drive, and 0.01% differential gain error-enabling precision video line driving and ADC buffering in broadcast and instrumentation systems.

For engineers reviewing the THS4042CDRG4 datasheet, THS4042CDRG4 pinout, THS4042CDRG4 application, or THS4042CDRG4 equivalent, key selection criteria include unity-gain stability with any capacitive load, low THD (−75 dBc at 1 MHz, RL = 150 Ω), wide supply range (±4.5 V to ±16 V), dual-channel crosstalk (−64 dB), and SOIC-8 package compatibility with standard PCB footprints.

Technical Context

The THS4042CDRG4 employs a dielectrically isolated complementary bipolar process enabling GHz f_T transistors, delivering high slew rate and fast settling (120 ns to 0.1%, ±15 V). Its internal adaptive compensation dynamically adjusts dominant-pole response based on capacitive load magnitude, preserving phase margin across CL = 0–1000 pF without external components.

This architecture supports both inverting and noninverting configurations at all gains, with rail-to-rail input common-mode range (±13.8 V at ±15 V supplies) and robust output swing (±11.5 V into 250 Ω). Channel-to-channel crosstalk remains ≤ −64 dB at 1 MHz, confirming true dual-channel isolation for multi-path signal conditioning.

Key Specifications

Pinout & Package

THS4042CDRG4 uses an 8-pin SOIC (D) package with exposed pad for thermal enhancement. Pin 1 is NULL (offset null for THS4041 only; no internal connection on THS4042), pins 2–3 and 6–7 are differential inputs/outputs per channel, pins 4 and 7 are power rails.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4032CD and THS4082ID, THS4042CDRG4 uniquely combines broadcast-grade video linearity (0.01% DG/DP), 165 MHz bandwidth, and ±100 mA drive in a single SOIC-8 package-making it irreplaceable for dual-channel video distribution and high-fidelity ADC interface designs.

Availability

THS4042CDRG4 is available at Aetrix Electronics and suitable for video distribution amplifiers, high-speed data acquisition systems, and multi-channel instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for THS4042CDRG4 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 signal chain ICs.

The THS4042CDRG4 belongs to TI's C-Stable™ high-speed op-amp family, engineered specifically for applications demanding unconditional stability into heavy capacitive loads-such as video routing, test equipment, and high-resolution data converters.

FAQ

What is the maximum capacitive load THS4042CDRG4 can drive while remaining stable?

The THS4042CDRG4 is designed to remain stable with any capacitive load up to 1000 pF without external compensation. Data sheet Figure 24 confirms ≤10% overshoot at CL = 1000 pF under 1-V and 5-V steps. For loads >1000 pF, a series isolation resistor (≥20 Ω) is recommended per Figure 65. This capability is core to its C-Stable architecture and distinguishes THS4042CDRG4 from standard high-speed op-amps.

Does THS4042CDRG4 support single-supply operation?

Yes, THS4042CDRG4 supports single-supply operation from 9 V to 32 V. The common-mode input voltage range extends to within 1.2 V of the negative rail (e.g., 3.8 V at VCC = 5 V), and output swing reaches ±3.2 V into 150 Ω. This allows use in 12-V or 24-V industrial systems without level-shifting circuitry-verified in Section "Recommended Operating Conditions" and Figure 47 of the THS4042CDRG4 datasheet.

What is the purpose of Pin 1 (NULL) on THS4042CDRG4?

Pin 1 (NULL) on THS4042CDRG4 is a no-connect terminal-it has no internal connection and serves no function. Offset nulling is only implemented on the single-channel THS4041 (see Figure 66). Using a potentiometer on THS4042CDRG4's Pin 1 will have no effect on input offset voltage, which is specified at 2.5–10 mV (typ/max) and drifts only 10 µV/°C. This distinction is explicitly noted in the "Functional Block Diagram" and "Absolute Maximum Ratings" sections.

How does THS4042CDRG4 achieve unity-gain stability with high slew rate?

THS4042CDRG4 achieves unity-gain stability via proprietary internal compensation that adapts to capacitive loading-unlike conventional dominant-pole compensation that sacrifices bandwidth. Its dielectrically isolated complementary bipolar process enables GHz f_T transistors, allowing high slew rate (400 V/µs) without sacrificing phase margin. This is confirmed by open-loop gain/phase plots (Figure 3) showing >45° phase margin at unity gain, and by stability testing across CL = 0–1000 pF in Figures 50–57.

Is THS4042CDRG4 pin-compatible with other devices in the THS40xx family?

THS4042CDRG4 shares the same SOIC-8 (D) package and pinout as THS4041CD, THS4032CD, and THS4082ID-enabling drop-in replacement for footprint compatibility. However, functional differences exist: THS4041 is single-channel, THS4032 offers lower noise but reduced speed, and THS4082 prioritizes power efficiency. Electrical validation is required before substitution, particularly for video linearity and capacitive load drive requirements unique to THS4042CDRG4.