Analog Devices Inc. LT1637IS8#TRPBF

Overview

LT1637IS8#TRPBF 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 V–, even on 3V supplies. It delivers 1.1MHz gain-bandwidth, 0.4V/µs slew rate, ±25mA output drive, and shutdown mode reducing supply current to 3µA - ideal for battery-powered sensor conditioning and high-side current sensing in industrial monitoring systems.

For engineers reviewing the LT1637IS8#TRPBF datasheet, LT1637IS8#TRPBF pinout, LT1637IS8#TRPBF application, or LT1637IS8#TRPBF equivalent, key selection criteria include its reverse-supply protection to 25V, input common-mode range extending beyond V+, rail-to-rail output swing into 25mA loads, and guaranteed –40°C to 85°C operation in the 8-lead SOIC package.

Technical Context

The LT1637IS8#TRPBF employs a dual-input-stage architecture (NPN + PNP) enabling seamless operation across –0.4V to 44V input common-mode voltage relative to V–, with no phase reversal for inputs 5V below V– or 44V above V–. Its Over-The-Top® topology allows direct interfacing with high-voltage signals without level-shifting circuitry.

Internal compensation supports stable operation into capacitive loads up to 4700pF when using optional 0.22µF + 150Ω output network. Shutdown is activated by pulling SHDN ≥1.2V above V–, forcing output into high-impedance state while reducing quiescent current to ≤3µA.

Key Specifications

Pinout & Package

The LT1637IS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 5.0mm × 4.0mm × 1.5mm, with standard JEDEC MS-012AC outline and gull-wing leads. Thermal resistance θ_JA = 190°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6078IS8#TRPBF and OPA333AIDBVR, the LT1637IS8#TRPBF uniquely combines 44V input tolerance, reverse-battery immunity, and 25mA drive in a micropower SOIC package - making it irreplaceable in high-side current monitors and ruggedized sensor front-ends where voltage range and fault resilience are non-negotiable.

Availability

LT1637IS8#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, high-side current sensing, overvoltage-tolerant sensor interfaces, and 4mA–20mA transmitter front-ends requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1637IS8#TRPBF 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 legacy high-performance analog portfolio, emphasizing precision, robustness, and reliability in harsh environments.

The LT1637 product line was designed specifically for industrial and automotive signal conditioning where wide supply range, fault tolerance, and rail-to-rail performance are critical - targeting applications like battery management, current sensing, and sensor interfacing under extreme electrical conditions.

FAQ

What is the maximum input common-mode voltage for LT1637IS8#TRPBF?

The LT1637IS8#TRPBF supports an input common-mode voltage range from –0.4V to 44V relative to V–, independent of supply voltage. This Over-The-Top® capability allows direct connection to signals exceeding V+, such as 48V bus monitoring on a 3.3V supply - a feature confirmed in the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables.

Does LT1637IS8#TRPBF require external compensation for capacitive loads?

LT1637IS8#TRPBF is internally compensated for loads up to 200pF. For capacitive loads exceeding 200pF - such as long cables or LCD bias networks - optional external compensation using a 0.22µF capacitor in series with a 150Ω resistor between OUT and ground is required to maintain stability up to 4700pF, as specified in the datasheet's "Output Compensation" section and Typical Application TA03.

What is the shutdown behavior of LT1637IS8#TRPBF?

When the SHDN pin is driven ≥1.2V above V–, the LT1637IS8#TRPBF enters shutdown mode: supply current drops to ≤3µA, output becomes high-impedance, and input bias current falls below 0.1nA. Turn-off time is 3µs and turn-on time is 45µs (RL = 10kΩ), enabling rapid power cycling in duty-cycled sensor systems - all verified in the Electrical Characteristics table under "Shutdown" parameters.

Can LT1637IS8#TRPBF operate with a single 3V supply?

Yes, LT1637IS8#TRPBF is fully specified for 3V single-supply operation (V+ = 3V, V– = 0V), delivering rail-to-rail input and output swing, 1.1MHz GBW, and 25mA output drive. Its minimum supply voltage is 2.7V, and key parameters including V_OS, CMRR, and PSRR are explicitly tested and guaranteed at 3V per the "3V ELECTRICAL CHARACTERISTICS" section of the datasheet.

Is LT1637IS8#TRPBF pin-compatible with other LT1637 variants?

Yes, LT1637IS8#TRPBF shares identical 8-lead SOIC (S8) pinout with LT1637CS8, LT1637HS8, and LT1637MPS8 - all follow the same top-view pin numbering (1: NC, 2: –IN, 3: +IN, 4: V–, 5: SHDN, 6: OUT, 7: V+, 8: NC). The 'I' grade denotes –40°C to +85°C operation, but mechanical and electrical pin compatibility is maintained across all S8-packaged LT1637 variants.