Analog Devices Inc. LTC6090IS8E-5#PBF

Overview

LTC6090IS8E-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, precision, unity-gain-unstable operational amplifier optimized for noise gain ≥5 configurations. It operates from ±4.75V to ±70V (140V total), delivers 50mA output drive, features 12MHz gain-bandwidth product and 21V/µs slew rate, and is used in high-voltage DAC buffering, piezo drivers, and photodiode amplification where rail-to-rail output swing up to ±70V is required.

For engineers reviewing the LTC6090IS8E-5#PBF datasheet, LTC6090IS8E-5#PBF pinout, LTC6090IS8E-5#PBF application, or LTC6090IS8E-5#PBF equivalent, key selection criteria include guaranteed stability at noise gain ≥5, picoamp input bias current (≤50pA), thermal warning flag (TFLAG) activation at 145°C, output disable (OD) control referenced to COM, and SOIC-8E thermally enhanced package with exposed V– pad.

Technical Context

The LTC6090IS8E-5#PBF employs a proprietary CMOS process enabling 140V supply operation while maintaining precision characteristics: 1.25mV max input offset voltage, ±5µV/°C max drift, and 11nV/√Hz input voltage noise density. Its internal architecture includes differential input stage with ESD protection, thermal sensor with hysteresis, and open-drain TFLAG output that sinks 200µA when die temperature exceeds 145°C.

It integrates an active output disable path controlled by OD pin (active-low, referenced to COM), allowing standby current reduction to ~580µA while preserving input bias integrity. The COM pin serves as a dedicated reference for low-voltage logic interfacing, with internal resistive divider establishing ~21V open-circuit voltage when floating, and absolute voltage limits of –3V to +7V relative to COM on OD and TFLAG pins.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic SOIC with Exposed Pad (S8E), RoHS-compliant, junction-to-case thermal resistance θ_JC = 5°C/W. Exposed pad (Pin 9) is electrically connected to V– and must be soldered to PCB for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1490AIS8#PBF and OPA454AIDDA, the LTC6090IS8E-5#PBF uniquely combines ±70V operation, pA input bias, integrated thermal flag, and output disable-making it the only option for precision 140V systems requiring embedded safety and low-leakage sensing.

Availability

LTC6090IS8E-5#PBF is available at Aetrix Electronics and suitable for high-voltage DAC buffering, piezo actuator driving, and photodiode transimpedance amplification requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for LTC6090IS8E-5#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC6090 family was designed specifically for high-voltage precision signal conditioning-targeting applications demanding rail-to-rail output, ultra-low input bias, and robust thermal management in ±70V systems.

FAQ

What is the minimum noise gain required for stable operation of the LTC6090IS8E-5#PBF?

The LTC6090IS8E-5#PBF is specified for stable operation at noise gain ≥5. Unlike the unity-gain-stable LTC6090, this variant requires minimum noise gain of 5 to ensure ≥60° phase margin into 10kΩ loads. Attempting unity-gain configuration may cause oscillation or excessive overshoot.

How does the COM pin function in the LTC6090IS8E-5#PBF, and what happens if it is left unconnected?

If left unconnected, the COM pin of the LTC6090IS8E-5#PBF floats to ~21V due to an internal resistive divider. This voltage is referenced to V–, so proper logic interfacing requires tying COM to the low-voltage ground (e.g., 0V of a 3.3V MCU). Leaving it floating risks violating the –3V to +7V voltage limit between COM and OD/TFLAG pins.

Can the LTC6090IS8E-5#PBF safely drive a 200pF capacitive load?

Yes-the LTC6090IS8E-5#PBF is characterized to drive up to 200pF of capacitive load while maintaining stability in noise gain ≥5 configurations. For optimal performance, use feedback compensation (e.g., small CF across RF) and minimize parasitic capacitance at the output node per layout guidelines.

What is the purpose of the TFLAG pin on the LTC6090IS8E-5#PBF, and how should it be interfaced?

The TFLAG pin on the LTC6090IS8E-5#PBF is an open-drain output that sinks 200µA when die temperature exceeds 145°C. It requires an external pull-up resistor (e.g., 10kΩ to 3.3V) to generate a logic-high alert signal. Tying TFLAG directly to OD enables automatic thermal shutdown without external logic.

Does the LTC6090IS8E-5#PBF support single-supply operation, and what is the valid input common-mode range?

Yes-the LTC6090IS8E-5#PBF supports single-supply operation (e.g., 0V and +140V). Its input common-mode range is V– +3V to V+ –3V, meaning with V– = 0V and V+ = 140V, inputs must stay within 3V to 137V. This excludes rail-to-rail input capability but ensures precision operation across most of the supply range.