Analog Devices Inc. LT1636CMS8#PBF

Overview

LT1636CMS8#PBF from Analog Devices (formerly Linear Technology) is a micropower rail-to-rail input/output operational amplifier with Over-The-Top® input stage enabling common-mode operation up to 44V above VEE, 50µA quiescent current, 225µV max input offset voltage, and 220kHz gain-bandwidth product - designed for high-voltage sensor conditioning and battery monitoring in industrial and automotive systems.

For engineers reviewing the LT1636CMS8#PBF datasheet, LT1636CMS8#PBF pinout, LT1636CMS8#PBF application, or LT1636CMS8#PBF equivalent, key selection criteria include its 44V input common-mode range independent of VCC, shutdown capability reducing IQ to 4µA, reverse-battery protection to 27V, rail-to-rail output swing driving ±18mA, and guaranteed performance over –40°C to 125°C.

Technical Context

The LT1636CMS8#PBF employs a dual-input-stage architecture (PNP + NPN) enabling seamless operation across its full 44V input common-mode range - including voltages exceeding V+, with no phase reversal for inputs 5V below VEE or 44V above VEE. Its Over-The-Top® topology eliminates clamping diodes and supports differential input voltages up to 44V.

Internally compensated for stability into ≥200pF, it drives up to 10,000pF capacitive loads using an external 0.22µF/150Ω network. Shutdown is activated by pulling SHDN ≥1.2V above V–, reducing supply current to 4µA while maintaining high-impedance output and sub-0.1nA input bias current even at 44V common-mode.

Key Specifications

Pinout & Package

LT1636CMS8#PBF is housed in an 8-lead MSOP (MS8) package, 3mm × 3mm footprint, 1.1mm height, with exposed pad thermally connected to V–. Pin 1 is marked with a dot; pin numbering follows standard MSOP convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar rail-to-rail, high-voltage op amp applications.

Compared with LTC6081IMS8#PBF and AD8603ARZ-REEL7, the LT1636CMS8#PBF uniquely delivers 44V Over-The-Top® operation at micropower levels - making it irreplaceable in high-side sensing, battery pack monitoring, and industrial 24V/48V systems where input voltage exceeds the supply rail.

Availability

LT1636CMS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, MUX front-ends, and 4–20mA transmitter interfaces requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for LT1636CMS8#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1636 family.

The LT1636 product line was engineered for high-voltage, low-power signal conditioning in harsh environments - targeting automotive battery management, industrial process control, and portable test equipment where input voltage exceeds the supply rail.

FAQ

What is the maximum input common-mode voltage for LT1636CMS8#PBF?

The LT1636CMS8#PBF supports an input common-mode voltage extending 44V above VEE, independent of VCC. This Over-The-Top® capability allows direct connection to high-side nodes - such as battery positive terminals or 48V bus lines - without attenuation or level shifting. The specification is guaranteed across the full –40°C to 125°C temperature range and applies to both input pins simultaneously.

Does LT1636CMS8#PBF require external compensation for capacitive loads?

LT1636CMS8#PBF is internally compensated for stability into ≥200pF. For capacitive loads exceeding 200pF - such as long cables or LCD bias networks - a 0.22µF capacitor in series with a 150Ω resistor between OUT and ground provides stable operation up to 10,000pF. This network is explicitly validated in the LT1636CMS8#PBF datasheet and does not degrade DC accuracy or bandwidth significantly.

How does the shutdown function work on LT1636CMS8#PBF?

The LT1636CMS8#PBF enters shutdown when the SHDN pin (Pin 8) is driven ≥1.2V above V–, reducing quiescent current to 4µA and placing the output in high-impedance state. Input bias current drops below 0.1nA, even with inputs at 44V above V–. The shutdown pin tolerates up to 32V above V– and can be driven below V– with current limiting to avoid substrate diode conduction.

Can LT1636CMS8#PBF operate with a 3V single supply?

Yes, LT1636CMS8#PBF is fully specified and characterized for 3V single-supply operation (V+ = 3V, V– = 0V), including rail-to-rail input/output swing, 225µV max VOS, and 220kHz GBW. It maintains functionality down to 2.7V total supply and supports input common-mode voltages up to 44V above V– - enabling use in 3V microcontroller systems monitoring higher-voltage subsystems.

What is the reverse battery protection rating for LT1636CMS8#PBF?

LT1636CMS8#PBF provides reverse battery protection up to –27V on the V+ pin relative to V–, drawing less than 1nA supply current under fault condition. This feature is built-in and requires no external components - making it suitable for automotive, solar charge controller, and portable equipment where incorrect battery insertion is a risk.