Analog Devices Inc. LT1803CS5#TRPBF

Overview

LT1803CS5#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, rail-to-rail input and output operational amplifier optimized for high-speed, low-voltage signal conditioning. It delivers 100 V/µs slew rate, 85 MHz gain bandwidth product, 21 nV/√Hz input voltage noise, ±42 mA output drive, and operates from 2.3 V to 12.6 V supplies - enabling precision buffering in ADC front-ends and video line drivers.

For engineers reviewing the LT1803CS5#TRPBF datasheet, LT1803CS5#TRPBF pinout, LT1803CS5#TRPBF application, or LT1803CS5#TRPBF equivalent, key selection criteria include rail-to-rail I/O swing within 20 mV of rails, 3.1 mA max supply current per amplifier, –40°C to 85°C industrial temperature range, and compatibility with 3 V/5 V/±5 V supplies in space-constrained SOT-23-5 layouts.

Technical Context

The LT1803CS5#TRPBF employs a dual-input-stage architecture: a PNP pair active from V– to ~1.3 V below V+, and an NPN pair active near V+, enabling true rail-to-rail common-mode input range (0 V to V_S). Its complementary common-emitter output stage supports rail-to-rail output swing with <20 mV saturation at 5 mA load.

It maintains stable unity-gain operation with capacitive loads up to 100 pF when series output resistance is used, and achieves 0.01% settling in 350 ns with 2 V step at AV = 1 and RL = 1 kΩ - confirming suitability for fast data acquisition and video signal paths.

Key Specifications

Pinout & Package

The LT1803CS5#TRPBF is housed in a 5-lead plastic TSOT-23 package (1 mm height), with thermal pad connected internally to V–. Pin 1 is V+, Pin 2 is V–, Pin 3 is +IN, Pin 4 is –IN, and Pin 5 is VOUT - matching standard op-amp functional assignment and PCB footprint compatibility with industry-standard SOT-23-5 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4891-1ARJZ-R7 and OPA355DBVR, the LT1803CS5#TRPBF uniquely balances 100 V/µs slew rate, 42 mA drive, rail-to-rail I/O, and 3.1 mA quiescent current - making it optimal for space-constrained, mixed-signal industrial interfaces where both speed and DC precision matter.

Availability

LT1803CS5#TRPBF is available at Aetrix Electronics and suitable for ADC driver circuits, video signal conditioning, rail-to-rail sensor interfaces, and active filter stages requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1803CS5#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 high-performance analog portfolio, including precision op amps, data converters, and power management ICs for demanding industrial, automotive, and communications applications.

The LT1803CS5#TRPBF belongs to Linear's LT180x family of rail-to-rail I/O op amps, designed specifically for high-fidelity signal conditioning in low-voltage, high-speed systems - emphasizing low noise, fast settling, and robust capacitive-load drive capability.

FAQ

What is the maximum capacitive load the LT1803CS5#TRPBF can drive stably in unity-gain configuration?

The LT1803CS5#TRPBF remains stable driving up to 100 pF in unity-gain configuration when a small series resistor (e.g., 10–50 Ω) is placed between the output and the capacitive load. Without series resistance, stability degrades beyond ~20 pF. This behavior is confirmed in Figure 30–32 of the 180345f datasheet and applies directly to the LT1803CS5#TRPBF in its SOT-23-5 package.

Does the LT1803CS5#TRPBF support true rail-to-rail input common-mode range with 3 V single supply?

Yes - the LT1803CS5#TRPBF supports input common-mode voltage from V– (0 V) to V+ (3 V) under 3 V single supply, verified across –40°C to 85°C. Its dual-input-stage architecture (PNP + NPN) ensures continuous operation across the full range, with typical input offset voltage ≤4 mV at VCM = 0 V and ≤9 mV at VCM = 3 V per the –40°C to 85°C electrical characteristics table.

What is the typical output voltage swing of the LT1803CS5#TRPBF at 15 mA load current with 5 V supply?

With VS = 5 V, ISINK = 15 mA, the LT1803CS5#TRPBF typically swings to within 300 mV of V– (i.e., VOL ≈ 0.3 V), and with ISOURCE = 15 mA, it swings to within 600 mV of V+ (i.e., VOH ≈ 4.4 V). These values are specified in the "ELECTRICAL CHARACTERISTICS" table (page 5, –40°C to 85°C column) and reflect real-world drive capability into moderate loads.

Is the LT1803CS5#TRPBF pin-compatible with other SOT-23-5 op amps like the LT1361 or AD8601?

No - the LT1803CS5#TRPBF uses standard op-amp pinout (V+, V–, +IN, –IN, VOUT), but LT1361 (SO-8 only) and AD8601 (SOT-23-5) assign pins differently: AD8601 places VOUT on Pin 1 and V+ on Pin 5. The LT1803CS5#TRPBF pinout matches generic SOT-23-5 op-amp conventions (e.g., OPA344, MCP6001), not AD8601. Always verify layout against the LT1803CS5#TRPBF top view diagram on page 1 of the datasheet.

What thermal considerations apply to the LT1803CS5#TRPBF in the TSOT-23-5 package?

The LT1803CS5#TRPBF TSOT-23-5 package has θ_JA = 250°C/W (no PCB copper) but drops to ~120°C/W with 1-inch² 2-oz copper pad under the thermal pad (connected to V–). At 3.1 mA supply current and ±5 V operation, dissipation is ~31 mW; junction temperature rise is ≤3.7°C with proper layout - well below the 150°C absolute maximum, even at 85°C ambient.