Analog Devices Inc. LTC6240HVCS8#PBF

Overview

LTC6240HVCS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, rail-to-rail output, low-noise CMOS operational amplifier optimized for high-precision, high-impedance signal conditioning. It delivers 18MHz gain bandwidth, 10V/μs slew rate, 550nV_P-P (0.1Hz–10Hz) input noise, ≤1pA max input bias current, and operates from ±2.5V to ±5.5V supplies - ideal for photodiode amplification and medical sensor front-ends.

For engineers reviewing the LTC6240HVCS8#PBF datasheet, LTC6240HVCS8#PBF pinout, LTC6240HVCS8#PBF application, or LTC6240HVCS8#PBF equivalent, key selection criteria include guaranteed 1pA max input bias current at 25°C, HV-grade ±5.5V supply capability, SO-8 package with guard-ring-compatible layout, and H-grade temperature range support up to 125°C.

Technical Context

The LTC6240HVCS8#PBF employs a proprietary CMOS input stage with ultra-low gate leakage, enabling sub-picoampere bias current critical for charge-integrating and high-Z transducer applications. Its unity-gain-stable architecture supports fast settling (900ns to 0.1%) and full-power bandwidth of 1.06MHz at 3V_P-P output into 1kΩ.

Designed for dual-supply operation up to ±5.5V, it maintains rail-to-rail output swing within 30mV of either rail and extends input common-mode range to the negative supply rail. The HV variant guarantees performance across the full ±5V operating range, unlike standard LTC6240 versions limited to 7V total supply.

Key Specifications

Pinout & Package

Package: 8-lead plastic SO (SO-8), RoHS-compliant, lead-free finish. Thermal resistance θ_JA = 190°C/W. Designed for PCB guard ring implementation to minimize leakage paths.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, rail-to-rail output op amp applications.

Compared with ADA4522-1ARZ and OPA377AIDR, the LTC6240HVCS8#PBF uniquely balances ultra-low input bias current (≤1pA), 18MHz bandwidth, ±5.5V operation, and 550nV_P-P low-frequency noise - making it irreplaceable in high-Z, wide-dynamic-range, dual-supply precision analog front-ends.

Availability

LTC6240HVCS8#PBF is available at Aetrix Electronics and suitable for photodiode amplification, medical instrumentation, and high-impedance transducer interfacing requiring stable component supply across industrial, test & measurement, and portable healthcare platforms.

Supply support for LTC6240HVCS8#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC6240 family belongs to ADI's precision op amp product line, engineered specifically for ultra-low-input-bias-current, low-noise, rail-to-rail output signal conditioning in demanding scientific, medical, and industrial sensing applications.

FAQ

What is the maximum guaranteed input bias current for LTC6240HVCS8#PBF?

The LTC6240HVCS8#PBF guarantees ≤1pA maximum input bias current at 25°C, as explicitly specified in the Electrical Characteristics table for the LTC6240 (single version) under "IB Input Bias Current" with condition "LTC6240 l 0.2 1 75 pA pA". This is a key differentiator for high-impedance sensor applications.

Does LTC6240HVCS8#PBF support true dual-supply ±5V operation?

Yes. The LTC6240HVCS8#PBF is the HV (High Voltage) variant, explicitly rated for total supply voltages up to 12V - enabling reliable operation from ±5V (10V total) and ±5.5V (11V total). Standard LTC6240 versions are limited to 7V total supply, making the HV suffix critical for ±5V systems.

What is the purpose of the NC pins (1, 6, 7) on the LTC6240HVCS8#PBF SO-8 package?

The NC pins (1, 6, 7) on the LTC6240HVCS8#PBF are electrically isolated and serve as guard ring tie points on the PCB. Per the datasheet pin configuration diagram and design recommendations, they enable routing of a grounded guard trace around the input pins (+IN, −IN) to reduce leakage and parasitic capacitance - essential for preserving sub-picoampere bias current performance.

How does the 0.1Hz–10Hz noise specification of LTC6240HVCS8#PBF impact its use in DC-coupled applications?

The 550nV_P-P 0.1Hz–10Hz noise directly determines baseline stability in DC-coupled applications such as ECG amplifiers or precision weigh scales. This low 1/f noise minimizes observable drift and flicker in time-domain waveforms, ensuring accurate long-duration measurements without requiring AC coupling or complex digital post-processing to suppress low-frequency artifacts.

Is LTC6240HVCS8#PBF unity-gain stable, and what does that mean for circuit design?

Yes, the LTC6240HVCS8#PBF is unity-gain stable, meaning it remains stable with closed-loop gain ≥1 without requiring external compensation components. This allows direct use as a voltage follower or gain-of-one buffer, simplifying schematic design, reducing PCB area, eliminating stability tuning, and avoiding phase-margin degradation due to capacitive loads up to 5pF - as verified in the Gain Bandwidth vs Temperature and Phase Margin plots.