Analog Devices Inc. LT1366CN8#PBF

Overview

LT1366CN8#PBF from Analog Devices (formerly Linear Technology) is a dual precision rail-to-rail input/output operational amplifier in 8-lead PDIP package, featuring 400kHz gain-bandwidth, 0.13V/µs slew rate, 150µV typical input offset voltage, and operation from 1.8V to ±15V supplies. It serves as a high-accuracy buffer, current sense amplifier, or A/D driver in low-voltage industrial signal chains.

For engineers reviewing the LT1366CN8#PBF datasheet, LT1366CN8#PBF pinout, LT1366CN8#PBF application, or LT1366CN8#PBF equivalent, key selection criteria include rail-to-rail I/O swing at 3V supply, 90dB CMRR over full common-mode range, 375µA per amplifier supply current, stability with ≤1000pF capacitive loads, and compatibility with single- or split-supply configurations.

Technical Context

The LT1366CN8#PBF employs a dual-input-stage architecture-comprising PNP and NPN differential pairs-switched by a comparator to maintain rail-to-rail input operation across the full supply range. Its complementary bipolar process ensures matched output device characteristics for symmetrical rail-to-rail output swing.

Conventional internal compensation enables stable operation without external components for capacitive loads ≤1000pF. Unlike the LT1368 variant, it does not require an output capacitor, making it suitable for applications where output filtering is undesirable or where load capacitance is inherently low.

Key Specifications

Pinout & Package

LT1366CN8#PBF is housed in an 8-lead plastic DIP (N8) package with standard dual op amp pinout and through-hole mounting. Thermal resistance θ_JA = 130°C/W enables operation up to 70°C ambient without heatsinking under typical loads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1366CS8#PBF, the LT1366CN8#PBF offers identical performance in a through-hole package suited for prototyping and repair; versus OP2177ARZ, it trades DC precision for full rail-to-rail input capability and wider supply flexibility-critical for low-voltage, wide-dynamic-range sensing.

Availability

LT1366CN8#PBF is available at Aetrix Electronics and suitable for current sense amplification, rail-to-rail sensor interfacing, A/D converter driving, and low-voltage signal chain applications requiring stable component supply across production lifecycles.

Supply support for LT1366CN8#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 its precision analog portfolio, renowned for high-performance op amps, references, and signal conditioning ICs targeting industrial, medical, and test equipment.

The LT1366CN8#PBF belongs to the LT1366/LT1367 family of dual/quad rail-to-rail precision op amps designed specifically for low-voltage, high-accuracy applications where input and output headroom must be maximized-such as battery-powered instrumentation and mixed-signal data acquisition.

FAQ

What is the maximum capacitive load the LT1366CN8#PBF can drive while remaining stable?

The LT1366CN8#PBF is internally compensated for stable operation with capacitive loads up to 1000pF without external compensation. This specification applies across the full 1.8V to ±15V supply range and eliminates the need for series isolation resistors when driving ADC inputs or long cables. Exceeding 1000pF may cause peaking or oscillation; for larger loads, consider the LT1368CN8#PBF which requires a 0.1µF output capacitor for improved stability.

Does the LT1366CN8#PBF support true rail-to-rail input operation at 3V single supply?

Yes, the LT1366CN8#PBF supports true rail-to-rail input operation from V– to V+ at 3V single supply (V+ = 3V, V– = 0V). Its dual-input-stage architecture-using both PNP and NPN differential pairs-ensures continuous operation across the entire common-mode range, including 0V and 3V. This enables direct interfacing with sensors whose outputs swing to ground or supply, without external level-shifting circuitry.

What is the typical input offset voltage drift over temperature for the LT1366CN8#PBF?

The LT1366CN8#PBF has a specified input offset voltage drift of 2µV/°C (typical) over the 0°C to 70°C operating temperature range. At 25°C, typical V_OS is 150µV; over a 50°C change, this contributes approximately 100µV of additional drift. The maximum guaranteed drift is 6µV/°C, resulting in ≤300µV total V_OS shift across the full temperature range-critical for maintaining accuracy in uncalibrated industrial sensor interfaces.

Can the LT1366CN8#PBF be used in a single-supply 1.8V application?

Yes, the LT1366CN8#PBF is fully specified down to 1.8V total supply (V+ = 1.8V, V– = 0V). At this voltage, it maintains rail-to-rail input operation, 375µA per amplifier supply current, and 150µV typical input offset voltage. Output swing remains within 120mV of each rail at 0.5mA load, delivering usable dynamic range in ultra-low-power applications such as energy-harvesting sensor nodes or wearables powered by thin-film batteries.

How does the LT1366CN8#PBF differ from the LT1368CN8#PBF?

The LT1366CN8#PBF uses conventional internal compensation and operates stably without external capacitors, while the LT1368CN8#PBF requires a 0.1µF output capacitor to achieve higher PSRR (>105dB) and lower high-frequency output impedance. The LT1366CN8#PBF has a 400kHz GBW and 0.13V/µs slew rate; the LT1368CN8#PBF trades bandwidth (160kHz GBW) and speed (0.065V/µs) for enhanced noise rejection-making the LT1366CN8#PBF preferable for general-purpose precision buffering and the LT1368CN8#PBF better suited for noisy mixed-signal environments driving ADCs.