Analog Devices Inc. LTC6085HGN#PBF

Overview

LTC6085HGN#PBF from Analog Devices (formerly Linear Technology) is a quad, rail-to-rail input/output, unity-gain stable CMOS operational amplifier optimized for precision, low-power signal conditioning in harsh-temperature environments. 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 is widely deployed in medical sensor front-ends and portable data acquisition systems requiring high DC accuracy and ultra-low input leakage.

For engineers reviewing the LTC6085HGN#PBF datasheet, LTC6085HGN#PBF pinout, LTC6085HGN#PBF application, or LTC6085HGN#PBF equivalent, key selection criteria include guaranteed 125°C operation, shutdown capability per channel, rail-to-rail swing within 5mV of rails, and verified performance in high-impedance pH probe and strain gauge interfaces where input bias current directly impacts measurement fidelity.

Technical Context

The LTC6085HGN#PBF integrates four independent amplifiers sharing a common 16-pin SSOP (GN) package with exposed V– pad. Its input stage combines PMOS and NMOS differential pairs to achieve full rail-to-rail common-mode range, while its Class AB output stage enables 7.7mA short-circuit current and rail-swing capability under light loads. Each amplifier features individual active-low shutdown pins (SHDNA–SHDND), enabling dynamic power gating in multi-channel systems without external logic.

It is specified over –40°C to 125°C with guaranteed parameters including 750μV max offset voltage, 5μV/°C max drift, 94dB min PSRR, 70dB min CMRR (0–5V VCM), and 110μA per-amplifier supply current. The device maintains stability with capacitive loads up to 300pF in unity-gain configuration and exhibits 31nV/√Hz input voltage noise at 1kHz.

Key Specifications

Pinout & Package

The LTC6085HGN#PBF is housed in a 16-lead plastic SSOP (narrow, 0.150-inch width) package with exposed thermal pad connected to V–. Pin 1 is marked by notch; exposed pad must be soldered 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 LTC6085HDHC#PBF, the LTC6085HGN#PBF offers easier hand-soldering and legacy board compatibility; compared with LTC6082HMS8#PBF, it provides two additional amplifiers and independent shutdown-critical for scalable multi-sensor systems where channel flexibility and power granularity matter more than sub-100μV offset.

Availability

LTC6085HGN#PBF is available at Aetrix Electronics and suitable for portable medical diagnostics, industrial PLC analog I/O modules, and automotive cabin environmental sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6085HGN#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC6085 belongs to Linear's precision rail-to-rail op-amp family designed specifically for low-power, high-accuracy signal conditioning in harsh environments-emphasizing ultra-low input bias, guaranteed extended-temperature operation, and robust ESD tolerance for real-world sensor interfaces.

FAQ

What is the maximum operating temperature specification for the LTC6085HGN#PBF?

The LTC6085HGN#PBF is fully specified and guaranteed to operate from –40°C to 125°C. This H-grade qualification includes testing of key parameters-including offset voltage, input bias current, and PSRR-at temperature extremes, making it suitable for under-hood automotive, industrial motor control, and downhole instrumentation where ambient temperatures exceed 105°C.

Does the LTC6085HGN#PBF support individual amplifier shutdown, and how is it implemented?

Yes, the LTC6085HGN#PBF provides four independent active-low shutdown pins (SHDNA, SHDNB, SHDNC, SHDND), one per amplifier. Driving any SHDN pin ≤1.2V places its corresponding amplifier into high-impedance output state with ≤1.1μA supply current. Pins float to V+ via internal current sources when not asserted, ensuring default active operation without external pull-ups.

What is the input common-mode voltage range of the LTC6085HGN#PBF, and why does it matter for single-supply designs?

The LTC6085HGN#PBF features a true rail-to-rail input stage with common-mode range extending from V– to V+, meaning it accepts input signals equal to or slightly beyond the supply rails. This eliminates level-shifting requirements in single-supply systems (e.g., 3.3V or 5V), allowing direct interfacing with resistive divider references, thermistor outputs, or DAC buffers without external bias networks.

How does the LTC6085HGN#PBF achieve 1pA input bias current, and what layout practices preserve this performance?

The LTC6085HGN#PBF achieves 1pA typical input bias current using CMOS input transistors with optimized gate oxide and process control. To preserve this spec, use guard rings around +IN/–IN traces driven at the same potential as the input, avoid flux residue under the SSOP body, and isolate high-impedance nodes from adjacent supply or digital traces-especially critical in pH probe and photodiode applications where board leakage can dominate amplifier bias error.

Can the LTC6085HGN#PBF drive capacitive loads, and what is the maximum stable value in unity-gain configuration?

Yes, the LTC6085HGN#PBF is unity-gain stable and can drive up to 300pF capacitive load without oscillation or excessive overshoot. Performance curves show <10% overshoot at 300pF with 50Ω series resistance; for larger loads, adding a small isolation resistor (10–50Ω) between output and capacitor restores stability while maintaining bandwidth suitable for anti-aliasing and sensor filtering.