Analog Devices Inc. LT1800CS5#TRPBF

Overview

LT1800CS5#TRPBF 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, featuring 80MHz gain bandwidth, 25V/µs slew rate, 350µV max input offset voltage, 2mA max supply current, and operation from 2.3V to 12.6V supplies. It enables high-fidelity signal conditioning in space-constrained, low-voltage systems such as portable medical sensors and battery-powered data acquisition front-ends.

For engineers reviewing the LT1800CS5#TRPBF datasheet, LT1800CS5#TRPBF pinout, LT1800CS5#TRPBF application, or LT1800CS5#TRPBF equivalent, key selection criteria include its rail-to-rail swing within 20mV of both rails at 5mA load, ±5V/±2.5V dual-supply compatibility, 8.5nV/√Hz input noise density, and guaranteed 0°C to 70°C performance with LTRN marking.

Technical Context

The LT1800CS5#TRPBF employs a dual-input-stage architecture-PNP pair active from V– to ~1.2V below V+, NPN pair active for the remaining common-mode range up to V+-enabling seamless rail-to-rail input operation without phase reversal. Its complementary common-emitter output stage delivers true rail-to-rail output swing with <20mV saturation voltage at 5mA.

Internal bias current trimming reduces input bias current to ≤250nA over 0.2V above V– to 1.2V below V+, while patented input stage cancellation maintains low offset drift (1.5µV/°C typical). The device is optimized for unity-gain stability with capacitive loads up to 75pF and supports fast settling (250ns to 0.01%) in precision buffer configurations.

Key Specifications

Pinout & Package

LT1800CS5#TRPBF is housed in a 5-lead plastic TSOT-23 package (1mm height), pin-compatible with industry-standard SOT-23 footprints and optimized for high-density PCB layouts.

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 LT1800CS5#TRPBF uniquely balances 80MHz bandwidth, rail-to-rail swing within 20mV, and 2mA supply current-making it optimal for high-speed, low-voltage precision signal chains where both speed and dynamic range are critical.

Availability

LT1800CS5#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, industrial 4–20mA transmitters, laser driver circuits, and HD video line drivers requiring stable component supply across production lifecycles.

Supply support for LT1800CS5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for industrial, automotive, communications, and healthcare markets.

The LT1800CS5#TRPBF belongs to Linear Technology's precision high-speed op amp product line, designed specifically for applications demanding rail-to-rail operation, low noise, and wide bandwidth in miniature packages.

FAQ

What is the maximum capacitive load the LT1800CS5#TRPBF can drive stably in unity-gain configuration?

The LT1800CS5#TRPBF is optimized to drive up to 75pF capacitive load stably in unity-gain configuration without external compensation. For loads exceeding 75pF, a series isolation resistor of 10Ω to 50Ω must be placed between the LT1800CS5#TRPBF output and the load capacitance to maintain phase margin and prevent ringing. This design preserves closed-loop bandwidth while ensuring stability in ADC input buffers and cable drivers.

Does the LT1800CS5#TRPBF support operation from a single 3.3V supply?

Yes, the LT1800CS5#TRPBF operates from a single 3.3V supply (V+ = 3.3V, V– = 0V), with guaranteed specifications over 0°C to 70°C. Its rail-to-rail input accepts signals from 0V to 3.3V, and its output swings within 20mV of both rails at 5mA load-enabling full 3.3V ADC interface utilization without level-shifting circuitry. Minimum supply voltage is 2.3V, allowing operation during brownout conditions.

How does the dual-input-stage architecture of the LT1800CS5#TRPBF affect input offset voltage?

The LT1800CS5#TRPBF uses PNP and NPN input stages that activate sequentially across the common-mode range: the PNP stage dominates from V– to ~1.2V below V+, exhibiting <75µV typical offset; the NPN stage activates above that threshold, with higher offset (up to 3.5mV max at V+). This architecture enables seamless rail-to-rail input operation but introduces a small offset discontinuity (~100µV) near the transition point, which must be considered in DC-critical applications like precision integrators.

Can the LT1800CS5#TRPBF replace legacy op amps like the OP27 in existing designs?

The LT1800CS5#TRPBF is not a direct drop-in replacement for the OP27 due to fundamental differences: OP27 is a precision bipolar op amp with 0.1µV/°C drift and 3MHz GBW, while LT1800CS5#TRPBF is a high-speed rail-to-rail CMOS/bipolar hybrid with 80MHz GBW and 20mV rail margin. It can replace OP27 only in applications where speed and rail-to-rail operation outweigh ultra-low drift requirements-and only after verifying layout compatibility with the 5-pin TSOT-23 footprint and updated decoupling.

What thermal considerations apply to the LT1800CS5#TRPBF in a 5-pin TSOT-23 package?

The LT1800CS5#TRPBF in TSOT-23 has θ_JA = 250°C/W. At 5V supply and 5mA output load, power dissipation is ~10mW; junction temperature rise is then ~2.5°C above ambient. However, under worst-case conditions (±5V supplies, 20mA short-circuit load), dissipation reaches 0.165W, raising junction temperature by 41°C. To ensure TJ ≤ 150°C, ambient must remain ≤108°C-requiring adequate copper pour and avoiding placement near heat sources in compact enclosures.