Analog Devices Inc. LTC6090CFE#TRPBF

Overview

LTC6090CFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, precision CMOS rail-to-rail output operational amplifier optimized for ±70V (140V total) supply operation. It delivers 12MHz gain-bandwidth product, 21V/µs slew rate, 50mA output drive, and picoamp input bias current (50pA max), enabling high-impedance buffering and high-gain signal conditioning in photodiode amplifiers and piezo drivers.

For engineers reviewing the LTC6090CFE#TRPBF datasheet, LTC6090CFE#TRPBF pinout, LTC6090CFE#TRPBF application, or LTC6090CFE#TRPBF equivalent, key selection criteria include guaranteed 130dB CMRR over ±67V common-mode range, thermal warning flag (TFLAG) activation at 145°C, output disable (OD) control referenced to COM pin, and compatibility with 200pF capacitive loads without instability.

Technical Context

The LTC6090CFE#TRPBF uses a proprietary high-voltage CMOS process to achieve rail-to-rail output swing while maintaining low offset drift (±5µV/°C max) and ultra-low 1/f noise (3.5µV_P-P, 0.1Hz–10Hz). Its input stage incorporates back-to-back diodes and current-limiting resistors for robust ESD and overvoltage protection up to ±12V differential.

Internal thermal monitoring triggers an open-drain TFLAG output at 145°C with 5°C hysteresis, and a secondary shutdown activates at 175°C. The OD pin disables only the output stage-leaving input and bias circuits active-reducing quiescent current to 580µA typical while preserving fast wake-up response.

Key Specifications

Pinout & Package

The LTC6090CFE#TRPBF is housed in a 16-lead thermally enhanced TSSOP package (FE) with exposed pad (Pin 17) electrically connected to V–. The exposed pad must be soldered to PCB for thermal management (θ_JC = 10°C/W).

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 LTC6090CFE#TRPBF uniquely combines 140V operation, picoamp input bias, integrated thermal warning, and guard-pin layout support-making it the only option for precision photodiode and piezo applications demanding both ultra-high voltage and ultra-low leakage.

Availability

LTC6090CFE#TRPBF is available at Aetrix Electronics and suitable for photodiode amplifiers, piezo drivers, and high-voltage DAC buffers requiring stable component supply across industrial, test & measurement, and optical networking programs.

Supply support for LTC6090CFE#TRPBF 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 including precision op-amps, voltage references, and power management solutions.

The LTC6090CFE#TRPBF belongs to Linear's high-voltage precision op-amp family, engineered specifically for applications demanding rail-to-rail output, ultra-low input bias, and robust thermal protection in ±70V systems.

FAQ

What is the maximum safe operating supply voltage for the LTC6090CFE#TRPBF?

The LTC6090CFE#TRPBF has an absolute maximum total supply voltage of 150V (V+ to V–), but its specified operating range is ±4.75V to ±70V (140V total). Operation at 140V is fully characterized and supported across all electrical specifications-including 12MHz GBW and 21V/µs slew rate-with proper thermal management via the exposed V– pad.

How does the COM pin function in the LTC6090CFE#TRPBF, and what happens if left floating?

The COM pin on the LTC6090CFE#TRPBF serves as the reference voltage for OD and TFLAG logic levels. If left floating, an internal resistive divider pulls COM to approximately 30% above mid-supply (e.g., ~21V with ±70V supplies). For reliable low-voltage interfacing, COM must be tied to the system ground or controlled voltage source-never left unconnected in production designs.

Can the LTC6090CFE#TRPBF drive a 200pF capacitive load without external compensation?

Yes-the LTC6090CFE#TRPBF is explicitly characterized to drive up to 200pF capacitive loads stably without external compensation. This capability is validated across its full gain-bandwidth range and is critical for driving piezo elements and long cables in high-voltage instrumentation, where added capacitance would otherwise cause peaking or oscillation.

What is the purpose of the guard pins on the LTC6090CFE#TRPBF TSSOP package?

The LTC6090CFE#TRPBF features eight dedicated guard pins (Pins 2,3,6,7,10,11,13,15) that enable construction of a continuous guard ring around high-impedance nodes like –IN. This reduces PCB surface leakage and stray capacitance, preserving sub-picoamp input bias performance-essential for photodiode and electrometer applications where even 1pA error degrades accuracy.

Does the LTC6090CFE#TRPBF have built-in thermal shutdown, and how does TFLAG differ from it?

The LTC6090CFE#TRPBF implements dual thermal protection: the TFLAG pin is an open-drain warning output active at 145°C (with 5°C hysteresis), while a secondary hard shutdown engages at 175°C (7°C hysteresis). TFLAG allows system-level thermal management (e.g., throttling or fan control), whereas the 175°C shutdown forcibly disables the output stage to prevent permanent damage-both mechanisms operate independently and are guaranteed across temperature grades.