Analog Devices Inc. LT1813IS8#PBF

Overview

LT1813IS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed voltage-feedback operational amplifier with 100MHz gain bandwidth, 750V/µs slew rate, and ±3.5V input common-mode range on ±5V supplies. It delivers ±40mA output current into 100Ω loads and operates from –40°C to 85°C, making it suitable for video amplification, active filter stages, and high-fidelity cable drivers.

For engineers reviewing the LT1813IS8#PBF datasheet, LT1813IS8#PBF pinout, LT1813IS8#PBF application, or LT1813IS8#PBF equivalent, key selection criteria include unity-gain stability with 1000pF capacitive loads, low 8nV/√Hz input noise, 1.5mV max input offset voltage over temperature, and SO-8 package compatibility with legacy board layouts.

Technical Context

The LT1813IS8#PBF uses a proprietary voltage-feedback architecture with current-feedback slewing behavior, enabling high slew rate without sacrificing DC precision. Its complementary bipolar input stage provides first-order bias current cancellation, while internal compensation ensures stability across 0–1000pF capacitive loads in unity gain.

It features a high-impedance gain node controlled by transconductance and capacitance, where slew rate scales linearly with differential input voltage-maximizing performance in low-gain configurations like buffers and line drivers. The output stage employs complementary emitter followers capable of driving heavy resistive or reactive loads without external isolation.

Key Specifications

Pinout & Package

LT1813IS8#PBF is housed in an 8-lead plastic SO (S8) package, 3.9mm × 4.9mm × 1.75mm, with standard SOIC footprint and gull-wing leads. Pin 1 is marked with a beveled corner or dot; device is RoHS-compliant and lead-free (Pb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8052ARZ and OPA2355DGKR, LT1813IS8#PBF uniquely balances 100MHz bandwidth, 750V/µs slew, 1000pF load tolerance, and 3.6mA supply current - making it optimal for industrial video, active filtering, and medium-speed data acquisition where all four parameters are simultaneously constrained.

Availability

LT1813IS8#PBF is available at Aetrix Electronics and suitable for video signal conditioning, active filter implementation, and high-speed ADC driving requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1813IS8#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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LT1813IS8#PBF belongs to Linear Technology's precision high-speed op-amp product line, designed specifically for applications demanding wide bandwidth, fast settling, low distortion, and robust capacitive load drive - including test equipment, medical imaging, and communications infrastructure.

FAQ

What is the maximum capacitive load the LT1813IS8#PBF can drive while remaining stable?

The LT1813IS8#PBF is fully specified and tested for unity-gain stability with capacitive loads from 0pF to 1000pF. This capability is achieved via internal adaptive compensation that senses the load-induced pole and adjusts compensation dynamically. No external isolation resistor is required for driving ADC inputs, coaxial cables, or long PCB traces - unlike most 100MHz op-amps which require series R-C networks beyond 100pF.

Does the LT1813IS8#PBF support single-supply operation?

Yes, the LT1813IS8#PBF is fully specified for single 5V operation. With V_CM = 2.5V and RL tied to 2.5V, the output swings from 1.1V to 3.9V (100Ω load), and input common-mode range extends from 0.8V to 3.5V. All key AC specs - including 94MHz GBW, 350V/µs slew rate, and 30ns settling - are guaranteed under single 5V conditions per the datasheet's Section 6 electrical characteristics table.

What is the input bias current polarity and magnitude for the LT1813IS8#PBF?

The LT1813IS8#PBF uses a parallel NPN/PNP bipolar input stage that provides first-order bias current cancellation. As a result, input bias current polarity is not fixed - it may be positive or negative depending on beta matching between transistors. The datasheet specifies ±4µA maximum (–40°C to +85°C), with typical values near ±0.9µA at 25°C. For best DC accuracy, balanced source resistance at both inputs is recommended to minimize offset contribution from input offset current (max 400nA).

Can the LT1813IS8#PBF be used as a comparator?

No, the LT1813IS8#PBF is not intended for comparator use. Although its inputs tolerate ±6V differential voltage transiently, sustained differential input voltages cause excessive internal current (up to 40mA) and power dissipation, risking thermal damage. The device lacks open-collector output, hysteresis control, or propagation delay optimization required for reliable comparator operation. Use dedicated comparators such as LTC1540 or ADCMP350 instead.

What thermal considerations apply to the LT1813IS8#PBF in SO-8 package?

The LT1813IS8#PBF in SO-8 (S8) package has θ_JA = 150°C/W. At max supply current (4.5mA per amp × 2 = 9mA) and worst-case output loading (e.g., ±3V into 100Ω), power dissipation can reach ~108mW. In a 70°C ambient environment, this yields T_J ≈ 113°C - safely below the 150°C absolute maximum. Ensure adequate copper pour and airflow; avoid stacking heat-generating components nearby.