Analog Devices Inc. LT1881ACS8#PBF

Overview

LT1881ACS8#PBF from Analog Devices (formerly Linear Technology) is a dual rail-to-rail output, picoamp-input precision operational amplifier in an 8-lead SOIC package. It delivers 50 μV max input offset voltage, 200 pA max input bias current, and rail-to-rail output swing within 40 mV of V– and 220 mV of V+, operating from 2.7 V to 36 V total supply. It is used in high-accuracy thermocouple amplifiers and photo-current sensing circuits where low drift and ultra-low input current are critical.

For engineers reviewing the LT1881ACS8#PBF datasheet, LT1881ACS8#PBF pinout, LT1881ACS8#PBF application, or LT1881ACS8#PBF equivalent, key selection considerations include input offset voltage drift (0.8 μV/°C max), capacitive load drive capability (1000 pF at unity gain), open-loop gain (≥1 million), and specified temperature range (0°C to 70°C).

Technical Context

The LT1881ACS8#PBF implements a precision bipolar input stage with on-chip input bias current cancellation, enabling ultralow 200 pA max input bias current while maintaining matched performance between channels. Its rail-to-rail output stage uses complementary common-emitter followers to achieve 40 mV low-side and 220 mV high-side saturation voltages under load.

It operates across single-supply (2.7 V to 36 V) and split-supply configurations, with guaranteed specifications from 5 V to ±15 V. The device is stable at unity gain with up to 1000 pF capacitive loads and exhibits 120 dB channel separation at 1 kHz - critical for dual-channel instrumentation where crosstalk must be minimized.

Key Specifications

Pinout & Package

LT1881ACS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, with standard dual op amp pinout compatible with industry-wide layout footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OP2177ARZ-REEL7 and ADA4522-2ARMZ, the LT1881ACS8#PBF uniquely balances picoampere input bias, rail-to-rail output, 1000 pF capacitive load stability, and 0.65 mA supply current - making it optimal for dual-channel, battery-aware, high-impedance sensor interfaces where moderate speed suffices.

Availability

LT1881ACS8#PBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge transducer conditioners, and photo-current amplifiers requiring stable component supply, consistent lead-free compliance, and long-term industrial availability.

Supply support for LT1881ACS8#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 LT1881ACS8#PBF belongs to Linear's precision op amp product line, designed specifically for high-accuracy sensor signal conditioning, instrumentation, and low-power industrial measurement systems where input bias current, offset voltage, and output swing are critical.

FAQ

What is the maximum input bias current specification for LT1881ACS8#PBF?

The LT1881ACS8#PBF has a maximum input bias current of 200 pA at 0°C to 70°C ambient temperature. This value is guaranteed for the "A" grade variant and applies across the full specified operating temperature range. The low bias current enables accurate amplification of signals from high-impedance sources such as photodiodes and piezoelectric sensors without introducing significant error voltage across feedback networks.

Does LT1881ACS8#PBF support single-supply operation?

Yes, the LT1881ACS8#PBF supports true single-supply operation from 2.7 V to 36 V total supply voltage. Its rail-to-rail output stage swings to within 40 mV of V– (ground in single-supply mode) and 220 mV of V+, allowing full utilization of the supply range. Input common-mode range extends from V– + 1.0 V to V+ – 1.0 V, so proper biasing of noninverting inputs is required for DC-coupled single-supply use.

What is the guaranteed operating temperature range for LT1881ACS8#PBF?

The LT1881ACS8#PBF is specified for operation from 0°C to 70°C. This is the "C" grade temperature range, confirmed in the order information table of the datasheet. While the device is characterized and expected to function from –40°C to 85°C, only the 0°C to 70°C range is fully tested and guaranteed per datasheet specifications including offset voltage, bias current, and gain bandwidth.

Can LT1881ACS8#PBF drive a 1000 pF capacitive load stably?

Yes, the LT1881ACS8#PBF is explicitly characterized and guaranteed stable in unity-gain follower configuration with up to 1000 pF capacitive load. This capability is highlighted in both the Features and Applications sections of the datasheet and eliminates the need for external isolation resistors in DAC output buffering or ADC driver applications - simplifying design and improving signal fidelity.

What package type is used for LT1881ACS8#PBF?

The LT1881ACS8#PBF uses an 8-lead plastic SOIC (Small Outline Integrated Circuit) package, designated S8 in Linear Technology documentation. It measures 3.9 mm × 4.9 mm with 1.27 mm lead pitch and is RoHS-compliant and lead-free. The pinout matches industry-standard dual op amp layouts, enabling drop-in compatibility with existing SOIC-8 footprints.