Texas Instruments THS4042CD

Overview

THS4042CD from Texas Instruments is a dual-channel, high-speed voltage-feedback operational amplifier designed for driving capacitive loads in video and data acquisition systems. It delivers 165 MHz bandwidth (−3 dB, CL = 0 pF), 400 V/µs slew rate, ±15 V supply operation, unity-gain stability, and 100 mA output drive-enabling robust buffering of ADC inputs and 75-Ω video lines.

For engineers reviewing the THS4042CD datasheet, THS4042CD pinout, THS4042CD application, or THS4042CD equivalent, key selection criteria include capacitive-load stability up to 1000 pF, differential gain/phase error under 0.01% / 0.01° (NTSC), low THD (−89 dBc at 1 MHz, RL = 1 kΩ), and dual-channel crosstalk of −64 dB at 1 MHz.

Technical Context

The THS4042CD employs a dielectrically isolated complementary bipolar process with GHz f_T transistors, enabling wide bandwidth and fast settling (120 ns to 0.1%, 250 ns to 0.01%). Its internal C-stable compensation dynamically adjusts phase margin for capacitive loads up to 1000 pF without external components.

It supports both inverting and noninverting configurations at all gains, features independent null pins per channel (pins 1 & 8), and maintains video-grade performance: 0.01% differential gain error and 0.01° differential phase error at ±15 V with NTSC signals.

Key Specifications

Pinout & Package

THS4042CD is housed in an 8-pin SOIC (D package) with exposed thermal pad (PowerPAD™). The package provides enhanced thermal dissipation (θ_JA = 167°C/W on JEDEC Low-K board) and supports surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4042CD, THS4032CD trades bandwidth and capacitive-load stability for lower noise, while THS4082CD offers higher bandwidth and better power-supply rejection at the expense of ±15 V compatibility and peak output drive-making THS4042CD uniquely balanced for dual-supply, high-drive, video-critical applications.

Availability

THS4042CD is available at Aetrix Electronics and suitable for video distribution, high-speed data acquisition, and test equipment requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for THS4042CD 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 90 years of innovation in high-performance signal chain solutions.

The THS4042CD belongs to TI's C-Stable high-speed op-amp product line, engineered specifically for applications demanding unconditional stability into heavy capacitive loads-such as broadcast video, medical imaging, and automated test equipment.

FAQ

What is the maximum capacitive load the THS4042CD can drive while remaining stable?

The THS4042CD is internally compensated to remain stable with capacitive loads up to 1000 pF without external compensation components. At CL = 1000 pF, it maintains unity-gain stability with only minor peaking (<1 dB) in frequency response-verified in Figure 6 and Figure 10 of the SLOS237B datasheet. For loads beyond 1000 pF, a 20 Ω series isolation resistor is recommended.

Does the THS4042CD support single-supply operation?

Yes, the THS4042CD supports single-supply operation from 9 V to 33 V. Its common-mode input voltage range extends to within 1.2 V of each rail (e.g., ±3.8 V at ±5 V supply), and output swing reaches ±3.5 V into 1 kΩ with 5-V supplies-enabling use in ground-referenced sensor interfaces and portable instrumentation where dual supplies are impractical.

How does the THS4042CD achieve its 0.01% differential gain accuracy?

The THS4042CD achieves 0.01% differential gain error through precision bipolar transistor matching, low input bias current (2.5 µA typ), and optimized internal compensation that minimizes gain variation across the NTSC luminance/chrominance frequency band (0–4.2 MHz). This performance is measured at ±15 V supply, gain = 2, and 40 IRE NTSC modulation-meeting broadcast-grade specifications without external trimming.

Can the THS4042CD replace the THS4041CD in a dual-amplifier circuit?

No-the THS4042CD is a dual-channel device, while the THS4041CD is single-channel. Using one THS4042CD replaces two THS4041CDs, reducing PCB area and component count. However, pin compatibility is not maintained: THS4041CD uses an 8-pin SOIC with different pinout (e.g., Null on Pin 1 only), whereas THS4042CD dedicates Pins 1 and 8 to independent null controls for each channel.

What is the purpose of the NULL pins (1 and 8) on the THS4042CD?

The NULL pins (1 and 8) on the THS4042CD provide independent offset voltage trimming capability for each amplifier channel. By connecting a 10-kΩ potentiometer between Pins 1 and 8 and grounding the wiper to V_CC−, users can reduce input offset voltage from 2.5 mV (typ) to <0.5 mV-critical for DC-coupled precision applications like medical sensor conditioning or calibration circuits where residual offset impacts measurement accuracy.