Analog Devices Inc. LT1636HS8#PBF

Overview

LT1636HS8#PBF from Analog Devices (formerly Linear Technology) is a micropower rail-to-rail input/output operational amplifier with Over-The-Top® input stage, enabling operation with inputs up to 44V above VEE on supplies as low as 2.7V. It delivers 18mA output drive, 220kHz gain-bandwidth, 110dB CMRR, and operates across –40°C to 125°C. It is used in high-voltage sensor conditioning and battery monitoring where input common-mode range exceeds supply rails.

For engineers reviewing the LT1636HS8#PBF datasheet, LT1636HS8#PBF pinout, LT1636HS8#PBF application, or LT1636HS8#PBF equivalent, key selection criteria include its 44V-over-V_EE input capability, shutdown current of ≤15µA, rail-to-rail output swing under load, reverse-battery protection to 27V, and guaranteed performance over extended industrial temperature range.

Technical Context

The LT1636HS8#PBF employs a dual-input-stage architecture (PNP + NPN) that enables seamless Over-The-Top operation: the PNP stage dominates below V_CC – 0.8V, while the NPN stage activates near and above V_CC, maintaining high impedance and predictable bias current up to 44V above V_EE. This eliminates phase reversal and supports direct sensing of voltages beyond the positive rail.

Its internal compensation ensures unity-gain stability into capacitive loads up to 10,000pF when paired with an external 0.22µF/150Ω network. Shutdown is controlled via a dedicated SHDN pin (Pin 5), reducing quiescent current to ≤15µA while placing the output in high-impedance state - critical for power-constrained systems requiring dynamic signal path control.

Key Specifications

Pinout & Package

LT1636HS8#PBF is housed in an 8-lead plastic SO package (S8), with exposed pad connected to V– for thermal and noise performance. Pin 1 is null (no internal connection), Pin 5 is SHDN, and Pin 6 is output.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1490HS8#PBF and ADA4091-2ARZ, the LT1636HS8#PBF uniquely combines extended input common-mode range, shutdown control, and micropower operation - making it irreplaceable in high-voltage, battery-sensitive industrial monitoring where rail-exceeding inputs must be conditioned without auxiliary circuitry.

Availability

LT1636HS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, solar panel string monitoring, and MUX-based sensor hub applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for LT1636HS8#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 continuity, quality assurance, and technical documentation for legacy Linear parts including the LT1636 family.

The LT1636 product line was designed specifically for precision signal conditioning in harsh industrial and automotive environments where inputs exceed supply rails, temperature extremes occur, and power budgets are constrained - delivering robustness without sacrificing accuracy.

FAQ

What is the maximum input voltage allowed for LT1636HS8#PBF relative to V–?

The LT1636HS8#PBF supports an input common-mode voltage range extending up to 44V above V–, independent of V+, as specified in the Absolute Maximum Ratings and confirmed in the Electrical Characteristics tables. This Over-The-Top® capability allows direct connection to high-side nodes in battery or PV systems without external level-shifting circuitry. The LT1636HS8#PBF maintains functionality and avoids phase reversal even when inputs reach this limit.

Does LT1636HS8#PBF require external compensation for driving capacitive loads?

Yes - the LT1636HS8#PBF is internally compensated for loads ≤200pF. For capacitive loads exceeding 200pF (e.g., long cables or ADC input filters), a 0.22µF capacitor in series with a 150Ω resistor must be connected from OUT to ground to maintain stability up to 10,000pF. This network is explicitly validated in the datasheet's Typical Applications section and is required to prevent peaking or oscillation in high-capacitance configurations.

What is the guaranteed operating temperature range for LT1636HS8#PBF?

The LT1636HS8#PBF is rated for continuous operation from –40°C to +125°C, with all key parameters (including input offset voltage, CMRR, and supply current) fully specified and tested across this extended industrial temperature range. This is distinct from the C-grade (0°C to 70°C) and I-grade (–40°C to 85°C) variants, and is clearly indicated by the "H" suffix in the part number and confirmed in the Absolute Maximum Ratings table.

How does the shutdown function work on LT1636HS8#PBF?

The LT1636HS8#PBF features a dedicated active-high shutdown pin (Pin 5). Driving this pin ≥1.2V above V– enables normal operation; pulling it ≤0.3V relative to V– places the amplifier in shutdown mode, reducing quiescent current to ≤15µA and forcing the output into high-impedance state. The shutdown pin tolerates voltages up to 32V above V–, enabling direct interface with higher-voltage control logic without level translation.

Is LT1636HS8#PBF compatible with standard SO-8 PCB footprints?

Yes - the LT1636HS8#PBF uses the industry-standard 8-lead narrow-body SOIC (S8) package with 1.27mm pitch, matching JEDEC MS-012AC. Its footprint, solder pad layout, and thermal pad configuration (exposed V– pad) are fully compatible with standard SO-8 land patterns. Mechanical drawings in the datasheet confirm compliance with SOIC-N 0.150-inch body width and 0.228–0.244 inch width specifications.