Texas Instruments THS4042CDGN

Overview

THS4042CDGN from Texas Instruments is a dual-channel, voltage-feedback operational amplifier optimized for high-speed, unity-gain-stable operation with any capacitive load. It delivers 165 MHz small-signal bandwidth (±15 V, CL = 0 pF), 400 V/µs slew rate, and drives up to 100 mA into 20 Ω - enabling use in video line driving, ADC buffering, and high-fidelity signal conditioning.

For engineers reviewing the THS4042CDGN datasheet, THS4042CDGN pinout, THS4042CDGN application, or THS4042CDGN equivalent, key selection criteria include capacitive-load stability, differential gain/phase error (<0.01% / <0.01° at NTSC), low THD (−89 dBc @ 1 MHz, RL = 1 kΩ), wide supply range (±4.5 V to ±16.5 V), and MSOP-8 PowerPAD thermal performance.

Technical Context

The THS4042CDGN employs a dielectrically isolated complementary bipolar process with GHz f_T transistors, enabling high-speed voltage-feedback architecture. Its internal adaptive compensation senses output capacitance and adjusts dominant-pole response to maintain stability across 0–1000 pF loads without external components.

It supports both inverting and noninverting configurations at all gains, features matched dual channels with −64 dB crosstalk at 1 MHz, and integrates null pins (1 & 8) on each amplifier for offset trimming - though only THS4041 includes internal null circuitry; THS4042 uses external nulling via external resistors per channel.

Key Specifications

Pinout & Package

THS4042CDGN is housed in an 8-pin MSOP package with exposed thermal pad (PowerPAD™), optimized for low θ_JA = 58.4°C/W and high power dissipation (2.14 W at T_A = 25°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4032CDGN and THS4082IDGN, the THS4042CDGN uniquely combines guaranteed unity-gain stability across full capacitive load range, broadcast-grade video linearity, and commercial-temperature-rated MSOP packaging - making it irreplaceable in fixed-installation video routing and legacy test equipment upgrades.

Availability

THS4042CDGN is available at Aetrix Electronics and suitable for video distribution systems, high-speed data acquisition, and industrial analog signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for THS4042CDGN 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 analog design.

The THS404x family was engineered specifically for demanding video, instrumentation, and communications applications requiring wide bandwidth, low distortion, and unconditional stability into reactive loads - addressing critical gaps in legacy high-speed op-amp offerings.

FAQ

What is the maximum capacitive load the THS4042CDGN can drive while remaining stable?

The THS4042CDGN is designed to remain unity-gain stable with output capacitances up to 1000 pF without external compensation. Data sheet Figure 24 confirms stable step response with ≤1000 pF, and application note SLOA013 validates robust phase margin across this range. For loads >1000 pF, a series isolation resistor (≥20 Ω) is recommended. The THS4042CDGN's internal adaptive compensation actively adjusts pole placement based on sensed load capacitance.

Does the THS4042CDGN support single-supply operation?

Yes, the THS4042CDGN supports single-supply operation from 9 V to 33 V. Its common-mode input voltage range extends to within 1.2 V of the negative rail and 1.7 V below the positive rail (e.g., ±3.8 V with ±5 V supplies), enabling true single-supply use with appropriate level-shifting. The THS4042CDGN maintains full 165 MHz bandwidth and 400 V/µs slew rate under 24 V single-rail conditions per recommended operating conditions table.

How does the THS4042CDGN achieve 0.01% differential gain error in video applications?

The THS4042CDGN achieves 0.01% differential gain error through precision bipolar transistor matching, low input bias current (2.5 µA typ), and minimized internal thermal gradients - all validated under NTSC 40 IRE modulation at ±15 V supply. This performance is measured with gain = 2, RF = 1.3 kΩ, and is specified across temperature (0°C to 70°C). The THS4042CDGN's low distortion (−89 dBc) and flat 0.1 dB bandwidth (45 MHz) further ensure chroma/luma amplitude tracking.

Can the THS4042CDGN replace the THS4041CDGN in a dual-amplifier layout?

No - the THS4042CDGN is a dual-channel device, while the THS4041CDGN is single-channel. They share identical pinout per channel (DGN package), but THS4042CDGN integrates two amplifiers in one MSOP-8. Replacing two THS4041CDGNs with one THS4042CDGN saves board space and cost, but requires verifying that inter-channel crosstalk (−64 dB at 1 MHz) meets system isolation requirements. Layout must retain independent power/ground decoupling per channel.

What thermal considerations apply to the THS4042CDGN in MSOP-8 PowerPAD package?

The THS4042CDGN's MSOP-8 PowerPAD package achieves θ_JA = 58.4°C/W with 2 oz copper pad soldered to PCB - enabling 2.14 W power dissipation at T_A = 25°C. To avoid exceeding 150°C max junction temperature, maintain ≥1 cm² exposed copper area under the pad, use ≥4 thermal vias (0.3 mm diameter) to inner ground planes, and limit continuous output current to ≤80 mA at 70°C ambient. The THS4042CDGN's thermal shutdown is not integrated; design must rely on external thermal management.