Analog Devices Inc. LT6018IS8E#PBF

Overview

LT6018IS8E#PBF from Analog Devices (formerly Linear Technology) is a 33V precision operational amplifier with ultralow 0.1Hz–10Hz noise (30nV_P-P), maximum input offset voltage of 50µV, and 0.5µV/°C drift. It features an enable pin for shutdown (6.2µA quiescent current), 30V/µs slew rate, and 15MHz gain-bandwidth product - optimized for high-resolution data acquisition and low-noise signal conditioning in industrial instrumentation.

For engineers reviewing the LT6018IS8E#PBF datasheet, LT6018IS8E#PBF pinout, LT6018IS8E#PBF application, or LT6018IS8E#PBF equivalent, key selection criteria include its 124dB minimum CMRR over full common-mode range, 132dB minimum open-loop gain enabling <1ppm linearity, SO-8E exposed-pad thermal package, and verified shutdown behavior with 25µs enable time - all critical for precision ADC driver and multiplexed sensor interface designs.

Technical Context

The LT6018IS8E#PBF employs a proprietary bipolar input stage with series Zener diode protection-eliminating conventional input clamping diodes-to maintain ultralow bias current (<±60nA) and prevent transient-induced overload during large input steps. Its dual-supply architecture supports ±4V to ±16.5V operation (8V–33V total), with DGND referenced enable logic that scales across supply configurations.

DC precision is preserved via matched input transistors yielding 50µV max V_OS and 0.5µV/°C max drift, while 1.2nV/√Hz broadband noise at 1kHz and 30nV_P-P 0.1Hz–10Hz noise ensure fidelity in sub-Hz measurement systems. The output remains stable into 100pF capacitive loads at unity gain without external compensation.

Key Specifications

Pinout & Package

LT6018IS8E#PBF uses an 8-lead SOIC-8E package with exposed pad (Pin 9), rated for –40°C to +85°C operation. The exposed pad must be connected to V– or floated to minimize thermal resistance (θ_JA = 36°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Compared with OPA2189IDR and ADA4522-1ARZ, LT6018IS8E#PBF uniquely balances ultralow 1/f noise, fast settling, integrated shutdown, and SO-8E thermal packaging - making it optimal for battery-powered, multiplexed, or thermally constrained precision systems where both noise and power efficiency matter.

Availability

LT6018IS8E#PBF is available at Aetrix Electronics and suitable for industrial instrumentation, precision data acquisition, and professional audio signal chains requiring stable component supply, extended temperature operation (–40°C to +85°C), and RoHS-compliant lead-free packaging.

Supply support for LT6018IS8E#PBF 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

Analog Devices acquired Linear Technology in 2017, inheriting its legacy of high-performance analog ICs focused on precision, power efficiency, and reliability.

The LT6018 product line was designed specifically for high-fidelity signal conditioning in demanding measurement systems - emphasizing ultralow noise, low drift, and robust input protection without sacrificing speed or DC accuracy.

FAQ

What is the maximum allowable common-mode input voltage range for LT6018IS8E#PBF?

The LT6018IS8E#PBF has a guaranteed common-mode input range of V– + 3V to V+ – 3V, enforced by its 124dB minimum CMRR. Exceeding this range increases input bias current and degrades open-loop gain and stability. For example, with ±15V supplies, valid input range is –12V to +12V - critical for interfacing with bridge sensors operating near rail limits.

How does the EN pin interface work with single-supply systems using LT6018IS8E#PBF?

In single-supply operation (e.g., V+ = 12V, V– = 0V), the LT6018IS8E#PBF's EN pin requires ≥1.7V relative to DGND (typically tied to V– = 0V) to enable. Thus, a logic-high signal ≥1.7V (e.g., 3.3V or 5V GPIO) suffices. DGND must remain at 0V; pulling EN below 0.8V disables the device, reducing supply current to 6.2µA.

Can LT6018IS8E#PBF drive capacitive loads, and what is the limit at unity gain?

Yes, the LT6018IS8E#PBF is unity-gain stable and can drive up to 100pF capacitive loads without external compensation. This is validated in the datasheet's Typical Performance Characteristics (Figure 6018 G19). Larger loads require a small series resistor (e.g., 10Ω) between OUT and the capacitor to maintain phase margin.

What is the thermal significance of the exposed pad on LT6018IS8E#PBF?

The exposed pad (Pin 9) on LT6018IS8E#PBF is electrically connected to V– and reduces thermal resistance from junction to ambient (θ_JA) to 36°C/W when soldered to a PCB copper plane. This is essential for dissipating 7.2mA × 30V = 216mW under worst-case conditions while keeping junction temperature below 150°C in industrial environments.

Does LT6018IS8E#PBF maintain output high-impedance in shutdown mode?

No, the LT6018IS8E#PBF output is not high-impedance in shutdown mode. As documented in the Applications Information section, leakage current flows through internal devices, causing the output to settle near mid-supply or interact with external circuitry (e.g., pulling a unity-gain buffer output to ~6V with ±15V supplies). External isolation switches may be needed in sensitive feedback paths.