Analog Devices Inc. LT2178CS8#PBF

Overview

LT2178CS8#PBF from Analog Devices (formerly Linear Technology) is a dual micropower precision operational amplifier in an 8-lead SOIC package, optimized for single-supply operation at 5V with rail-to-ground input and output capability. It delivers 17μA max supply current per amplifier, 70μV max input offset voltage, and 0.9μV_P-P voltage noise (0.1Hz–10Hz), enabling high-accuracy signal conditioning in battery-powered sensor interfaces and portable instrumentation.

For engineers reviewing the LT2178CS8#PBF datasheet, LT2178CS8#PBF pinout, LT2178CS8#PBF application, or LT2178CS8#PBF equivalent, key selection criteria include its guaranteed 0°C to 70°C commercial temperature range, true ground-sinking output stage eliminating pull-down resistors, picoampere-level input bias current (5nA max), and compatibility with megohm-level source impedances without significant error.

Technical Context

The LT2178CS8#PBF employs an all-NPN output stage that enables output swing to within millivolts of ground while sinking current-critical for single-supply systems where negative rails are unavailable. Its input stage uses matched transistor pairs to achieve low offset voltage drift (0.5μV/°C typ) and high common-mode rejection (93dB min at 5V supply).

Designed for ultra-low-power precision, the device operates down to 2V total supply (e.g., one lithium cell), with input voltage range extending 0.3V below ground and full functionality maintained across 0°C to 70°C. Gain bandwidth product is 85kHz, and slew rate is 0.04V/μs-sufficient for DC-coupled sensor amplification and micropower filtering without stability compromises.

Key Specifications

Pinout & Package

LT2178CS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body size, 1.27mm pitch, JEDEC MS-012 compliant. Thermal resistance θ_JA = 190°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT2078CS8#PBF and LT1490ACS8#PBF, the LT2178CS8#PBF uniquely balances sub-20μA power, <70μV offset, and ground-sinking capability - making it the only option among the three qualified for multi-year battery life in precision DC sensor nodes with ground-referenced outputs.

Availability

LT2178CS8#PBF is available at Aetrix Electronics and suitable for battery-powered sensor interfaces, portable instrumentation, and remote sensor amplifiers requiring stable component supply with guaranteed commercial temperature performance (0°C to 70°C).

Supply support for LT2178CS8#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear op amp families including LT2178/LT2179.

The LT2178CS8#PBF belongs to Linear's micropower precision op amp product line, designed specifically for energy-constrained, high-accuracy analog signal chains in portable and remote measurement systems.

FAQ

What is the maximum operating temperature range for the LT2178CS8#PBF?

The LT2178CS8#PBF is rated for the commercial temperature range of 0°C to 70°C. This is explicitly defined in the Order Information table and confirmed across all electrical characteristics sections labeled "LT2178C/LT2178I" - where the "C" suffix denotes the commercial grade. Industrial-grade variants (e.g., LT2178IS8#PBF) extend to –40°C to 85°C, but LT2178CS8#PBF does not qualify for operation outside 0°C–70°C.

Does the LT2178CS8#PBF support true single-supply operation with input signals below ground?

Yes. The LT2178CS8#PBF accepts input voltages down to 0.3V below V– (ground in single-supply configuration), as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This enables direct connection of transducers like thermocouples or bridge sensors whose outputs may go slightly negative relative to system ground - without requiring external level-shifting circuitry.

Can the LT2178CS8#PBF drive a 2kΩ load to ground while maintaining precision?

Yes. The LT2178CS8#PBF output can sink 100μA while staying within 120mV of ground (per Electrical Characteristics table), and sources/sinks ±5mA under load. When driving a 2kΩ load to ground with V+ = 5V, the output reaches ≤0.6V (600mV) - verified in the "Maximum Output Voltage Swing" row under "Output Low, 2k to GND" condition. This meets precision requirements for driving ADC reference inputs or low-threshold comparators.

What is the typical 0.1Hz–10Hz voltage noise of the LT2178CS8#PBF, and how does it impact low-frequency measurements?

The LT2178CS8#PBF has a typical voltage noise of 0.9μV_P-P over 0.1Hz–10Hz, as stated in both the Features list and Electrical Characteristics table. This low 1/f noise floor directly limits resolution in slow-sampling applications - for example, in a 1-second integration window, it contributes <0.3μV RMS error, enabling stable 16-bit-equivalent DC measurements in thermistor or strain gauge front ends without chopper stabilization.

Is the LT2178CS8#PBF pin-compatible with other dual op amps in SO-8 packages, such as the LT1013 or OP27?

No. The LT2178CS8#PBF follows the industry-standard dual op amp pinout (V+, OUT B, –IN B, +IN B, OUT A, –IN A, +IN A, V–), matching LT1013, LM358, and AD8602. However, it is not functionally or electrically pin-compatible with OP27 (which uses different pin assignments and requires ±15V supplies). System-level validation is required before drop-in replacement due to differences in supply range, output stage behavior, and noise performance.