Analog Devices Inc. LT1800IS5#TRMPBF

Overview

LT1800IS5#TRMPBF from Analog Devices (formerly Linear Technology) is a single, rail-to-rail input and output precision operational amplifier in a 5-pin TSOT-23 package, specified for –40°C to 85°C operation. It delivers 80MHz gain bandwidth, 25V/µs slew rate, 350µV max input offset voltage, 2mA max supply current, and rail-to-rail swing within 20mV of either supply - enabling high-fidelity signal conditioning in low-voltage, space-constrained industrial sensor interfaces and portable data acquisition systems.

For engineers reviewing the LT1800IS5#TRMPBF datasheet, LT1800IS5#TRMPBF pinout, LT1800IS5#TRMPBF application, or LT1800IS5#TRMPBF equivalent, key selection criteria include its guaranteed –40°C to 85°C performance, 2.3V minimum supply capability, input common-mode range extending to both rails, and compatibility with 3V/5V single-supply and ±5V dual-supply configurations in precision analog front-ends.

Technical Context

The LT1800IS5#TRMPBF employs a dual-input-stage architecture: a PNP pair active from V– to ~1.2V below V+, and an NPN pair taking over near V+ to ensure seamless rail-to-rail common-mode operation. This design enables consistent DC precision (e.g., 350µV max V_OS) and dynamic performance (80MHz GBW, 25V/µs SR) across the full input range.

Its output stage uses complementary common-emitter transistors to achieve true rail-to-rail swing (≤20mV from rails at 5mA), while internal compensation and 75pF capacitive load drive capability support stable unity-gain operation without external compensation - critical for driving ADC inputs and active filters.

Key Specifications

Pinout & Package

The LT1800IS5#TRMPBF is housed in a 5-lead plastic TSOT-23 package (1mm height), optimized for high-density PCB layouts. Pin 1 is marked with a dot; the package is RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA333AIDBVR and AD8605ARTZ-REEL7, the LT1800IS5#TRMPBF uniquely balances 80MHz bandwidth, rail-to-rail operation down to 2.3V, and 45mA short-circuit current - making it optimal for mixed-signal systems needing both precision DC specs and high-speed transient response in compact industrial designs.

Availability

LT1800IS5#TRMPBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data acquisition systems, and laser diode driver circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT1800IS5#TRMPBF 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 of high-performance analog ICs, emphasizing precision, speed, and reliability in signal conditioning and power management.

The LT1800 product line was designed for demanding precision analog applications where rail-to-rail operation, low power, and wide bandwidth must coexist - particularly in industrial automation, test equipment, and medical instrumentation front-ends.

FAQ

What is the maximum capacitive load the LT1800IS5#TRMPBF can drive stably in unity-gain configuration?

The LT1800IS5#TRMPBF is characterized to drive up to 75pF capacitively in unity-gain configuration without external compensation. For loads exceeding 75pF, a 10Ω to 50Ω series resistor between the LT1800IS5#TRMPBF output and the load restores stability by isolating the capacitance from the amplifier's feedback loop, as confirmed in the device's typical performance graphs (Figure G30/G31).

Does the LT1800IS5#TRMPBF support true single-supply operation down to 2.3V?

Yes, the LT1800IS5#TRMPBF is fully specified for operation from 2.3V to 12.6V total supply voltage, including single-supply configurations such as 3V (0V to 3V) and 5V (0V to 5V). Its rail-to-rail input and output stages function across this entire range, and key parameters like input offset voltage and supply current are guaranteed at 2.3V per the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the dual-input-stage architecture of the LT1800IS5#TRMPBF affect input offset voltage behavior?

The LT1800IS5#TRMPBF uses a PNP input stage active from V– to ~1.2V below V+, and an NPN stage active near V+. This causes V_OS to shift slightly at the crossover point - typically <75µV in the PNP region and <350µV overall across the full range. The datasheet specifies 350µV max V_OS over –40°C to 85°C, ensuring predictable error bounds regardless of input voltage position.

Can the LT1800IS5#TRMPBF be used as a direct replacement for older op amps like the OP27 or AD822 in existing designs?

The LT1800IS5#TRMPBF is not a pin-compatible drop-in replacement for OP27 (8-pin DIP/SO) or AD822 (8-pin SO) due to its 5-pin TSOT-23 footprint and different pinout. However, its rail-to-rail operation, lower supply current (2mA vs. 4mA), and higher bandwidth (80MHz vs. 8MHz for OP27) make it a functional upgrade in new designs where board space and power efficiency are critical - provided layout accommodates the smaller package and revised pin mapping.

What thermal considerations apply when operating the LT1800IS5#TRMPBF in its TSOT-23 package at maximum load?

The LT1800IS5#TRMPBF in TSOT-23 has θ_JA = 250°C/W. At ±5V supplies driving 20mA into a load, worst-case power dissipation is ~0.165W. To keep junction temperature ≤150°C, ambient must stay ≤108°C. For continuous high-current operation, minimize trace copper resistance, use thermal vias under the pad, and avoid enclosing the device in sealed housings without airflow.