Analog Devices Inc. LTC6085HDHC#PBF

Overview

LTC6085HDHC#PBF from Analog Devices (formerly Linear Technology) is a quad, rail-to-rail input/output, unity-gain stable CMOS operational amplifier optimized for low-power, precision signal conditioning. It delivers 1.5MHz gain bandwidth, 0.5V/μs slew rate, 750μV max offset voltage, 1pA typical input bias current at 25°C, and operates from 2.5V to 5.5V supply across –40°C to 125°C. It serves in high-impedance sensor front-ends and portable medical instrumentation.

For engineers reviewing the LTC6085HDHC#PBF datasheet, LTC6085HDHC#PBF pinout, LTC6085HDHC#PBF application, or LTC6085HDHC#PBF equivalent, key selection criteria include guaranteed H-grade temperature operation, DFN-16 package thermal performance (θ_JA = 43°C/W), shutdown current ≤1.1μA per amplifier, and rail-to-rail output swing within 5mV of rails under no load.

Technical Context

The LTC6085HDHC#PBF integrates four independent amplifiers in a single 16-lead DFN (5mm × 3mm) package with exposed V– pad. Its input stage combines PMOS and NMOS differential pairs to achieve true rail-to-rail common-mode range (V– to V+), while its Class AB output stage enables 7.7mA short-circuit current and rail-swing capability down to 5mV.

Each amplifier features active low shutdown pins (SHDNA–SHDND), enabling individual channel power gating. The device is unity-gain stable and supports capacitive loads up to 300pF in unity-gain configuration, with phase margin ≥45° at 10kΩ/150pF load.

Key Specifications

Pinout & Package

The LTC6085HDHC#PBF is housed in a 16-lead plastic DFN package (5mm × 3mm) with exposed thermal pad connected to V–. The package requires soldering of the exposed pad to PCB for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6085HGN#PBF, the LTC6085HDHC#PBF offers superior thermal performance and smaller footprint; compared with LTC6082HMS8#PBF, it provides double the channel count at the cost of higher offset, making it optimal for compact, thermally demanding quad-signal paths.

Availability

LTC6085HDHC#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition, and automotive cabin monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6085HDHC#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 LTC6085 belongs to Linear's precision rail-to-rail op-amp product line, engineered for low-power, high-accuracy signal conditioning in battery-operated and thermally constrained systems.

FAQ

What is the maximum operating temperature for the LTC6085HDHC#PBF?

The LTC6085HDHC#PBF is rated for continuous operation from –40°C to +125°C (H-grade specification). This is verified per the Absolute Maximum Ratings table and confirmed in the "Specified Temperature Range" section of the datasheet, where LTC6085H variants are explicitly guaranteed over this full industrial-plus range. Junction temperature must remain ≤150°C under all conditions.

Does the LTC6085HDHC#PBF support rail-to-rail input and output simultaneously?

Yes, the LTC6085HDHC#PBF supports true rail-to-rail input (common-mode range extends from V– to V+) and rail-to-rail output (swings within 5mV of both rails under no load). This is achieved via complementary PMOS/NMOS input stage and Class AB output stage, as detailed in the Applications Information section and verified by Typical Performance Characteristics curves (e.g., Output Saturation Voltage vs Load Current).

How many independent shutdown pins does the LTC6085HDHC#PBF have?

The LTC6085HDHC#PBF has four independent shutdown pins: SHDNA (Pin 5), SHDNB (Pin 6), SHDNC (Pin 11), and SHDND (Pin 16). Each controls one amplifier channel and is active-low. When pulled ≤1.2V, the corresponding amplifier enters shutdown, drawing ≤1.1μA and placing its output in high-impedance state - a feature confirmed in the Electrical Characteristics table and Pin Functions section.

What is the recommended PCB layout practice for minimizing input bias current degradation in the LTC6085HDHC#PBF?

To preserve the 1pA input bias current spec, avoid solder flux residue under the DFN-16 package and implement guard rings around high-impedance input traces. As stated in the Applications Information section, leakage paths from adjacent supply traces can dominate input error; a guard ring driven at the same potential as the input (e.g., via op-amp output in unity-gain config) blocks such leakage. The exposed V– pad must be soldered to a solid ground plane.

Is the LTC6085HDHC#PBF unity-gain stable?

Yes, the LTC6085HDHC#PBF is unity-gain stable, as explicitly stated in the DESCRIPTION section and verified by Phase Margin ≥45° under AV = 1, RL = 10kΩ, CL = 150pF test conditions in the Electrical Characteristics table. Stability is maintained up to 300pF capacitive load in unity-gain configuration, per the Capacitive Load Handling graphs (Figures G17/G18).