Texas Instruments THS4042IDGNR

Overview

THS4042IDGNR 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 (CL = 0 pF), 400 V/µs slew rate, ±15 V supply operation, unity-gain stability, and drives up to 100 mA into 20 Ω - enabling direct buffering of ADC inputs and 75-Ω video lines.

For engineers reviewing the THS4042IDGNR datasheet, THS4042IDGNR pinout, THS4042IDGNR application, or THS4042IDGNR 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), and MSOP-8 PowerPAD thermal performance.

Technical Context

The THS4042IDGNR employs a dielectrically isolated complementary bipolar process with GHz f_T transistors, enabling wide bandwidth and fast settling (120 ns to 0.1%). Its internal C-stable compensation dynamically adjusts phase margin for any capacitive load - eliminating external compensation in most cases while maintaining stability across ±4.5 V to ±16.5 V dual supplies.

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

Key Specifications

Pinout & Package

THS4042IDGNR uses an 8-pin MSOP package with exposed thermal pad (PowerPAD™), optimized for low junction-to-board thermal resistance (θ_JA = 58.4°C/W). The package supports automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4032IDGNR and THS4082IDGNR, the THS4042IDGNR uniquely combines C-stable operation, 165 MHz bandwidth, and 100 mA output drive - making it the only option among the three capable of driving 75-Ω video lines without external isolation components while maintaining broadcast-grade linearity.

Availability

THS4042IDGNR is available at Aetrix Electronics and suitable for video line drivers, ADC input buffers, high-speed pulse amplifiers, and test equipment signal generators requiring stable component supply across industrial temperature ranges.

Supply support for THS4042IDGNR 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 decades of heritage in high-performance op-amps and signal chain solutions.

The THS4042IDGNR belongs to TI's C-stable high-speed op-amp product line, engineered specifically for applications demanding unconditional stability into reactive loads - especially video, imaging, and high-fidelity data acquisition systems.

FAQ

What is the maximum capacitive load the THS4042IDGNR can drive while remaining stable?

The THS4042IDGNR is internally compensated for unconditional stability with any capacitive load - verified up to 1000 pF in datasheet testing. Its C-stable architecture senses load capacitance and adjusts internal compensation in real time, eliminating oscillation risk without external components. This makes THS4042IDGNR ideal for driving long traces, connectors, and ADC input capacitance in production systems.

Does the THS4042IDGNR support single-supply operation?

Yes, the THS4042IDGNR supports single-supply operation from 9 V to 32 V, as specified in its recommended operating conditions. However, its common-mode input voltage range is limited to within ~1.2 V of each rail - so for optimal linear performance at low voltages, ensure input signals remain within VICR (e.g., ≥1.5 V above GND and ≤(V_CC − 1.5 V)). For rail-to-rail input applications, consider alternative amplifiers.

What is the purpose of pins 1 and 8 on the THS4042IDGNR?

Pins 1 and 8 on the THS4042IDGNR are dedicated offset-null terminals - one pair per amplifier channel - allowing precise adjustment of input offset voltage using external potentiometers. Though THS4042IDGNR exhibits low typical V_OS (2.5 mV), these pins enable fine calibration in precision instrumentation applications where sub-millivolt DC accuracy is required across temperature.

How does the THS4042IDGNR compare to the THS4041IDGNR in terms of pin compatibility and functionality?

The THS4042IDGNR is the dual-channel version of the THS4041IDGNR single-channel amplifier. Both share identical pinouts in the MSOP-8 DGN package: pins 1–4 and 5–8 map identically to Channel 1 and Channel 2, respectively. This allows drop-in replacement of two THS4041IDGNRs with one THS4042IDGNR in space-constrained layouts - reducing component count and PCB area without redesigning routing or decoupling networks.

Is the THS4042IDGNR suitable for driving 75-Ω video lines without external series resistors?

Yes - the THS4042IDGNR's C-stable design and 100 mA output drive allow direct connection to 75-Ω video lines without external isolation resistors in most cases. Its 0.01% differential gain and 0.01° differential phase error at NTSC frequencies confirm compliance with broadcast video standards. For longest cable runs (>100 m) or marginal impedance matching, a 75-Ω series resistor may still be added to suppress reflections - but stability is guaranteed regardless.