Analog Devices Inc. LT1809CS6#TRPBF

Overview

LT1809CS6#TRPBF from Analog Devices (formerly Linear Technology) is a single, rail-to-rail input and output operational amplifier optimized for high-speed, low-voltage signal conditioning. It delivers 350 V/µs slew rate, 320 MHz –3dB bandwidth at unity gain, 180 MHz gain-bandwidth product (AV ≥ 10), and ±85 mA output current - enabling precise driving of ADC inputs, video lines, and active filters in 3V–12.6V systems.

For engineers reviewing the LT1809CS6#TRPBF datasheet, LT1809CS6#TRPBF pinout, LT1809CS6#TRPBF application, or LT1809CS6#TRPBF equivalent, key selection criteria include rail-to-rail swing within 20 mV of rails, –90 dBc distortion at 5 MHz, shutdown functionality, SOT-23-6 package compatibility, and guaranteed performance across 0°C to 70°C.

Technical Context

The LT1809CS6#TRPBF employs a complementary bipolar input stage enabling rail-to-rail common-mode input range (V– to V+) and output swing to within 20 mV of either supply rail. Its fast-settling architecture supports 0.1% settling in 27 ns (±2 V step, RL = 500 Ω) and maintains low THD (–90 dBc) up to 5 MHz under AV = 1, RL = 1 kΩ conditions.

It integrates an active shutdown pin (SHDN) that reduces supply current to ≤1.25 mA while maintaining <75 µA output leakage, enabling power-gated operation in portable and battery-sensitive designs. The device operates stably with supplies from 2.5 V to 12.6 V and tolerates input overvoltage beyond rails without phase reversal.

Key Specifications

Pinout & Package

LT1809CS6#TRPBF is housed in a 6-lead plastic TSOT-23 (ThinSOT™) package, 1 mm profile, with industry-standard op amp pinout and thermal pad connected to V–.

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 ADA4897-1ARJZ-R7 and OPA837IDBVR, the LT1809CS6#TRPBF uniquely combines rail-to-rail input/output, integrated shutdown, and 350 V/µs slew rate in a 6-pin SOT-23 - making it the only option among the three suitable for battery-powered, space-constrained, rail-to-rail sensor signal chains requiring dynamic power control.

Availability

LT1809CS6#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition, portable video systems, and low-voltage industrial sensor interfaces requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for LT1809CS6#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.

The LT1809CS6#TRPBF belongs to ADI's high-speed precision op amp product line, engineered for applications demanding wide bandwidth, low distortion, rail-to-rail operation, and robust power efficiency in compact form factors.

FAQ

What is the maximum supply voltage for LT1809CS6#TRPBF?

The absolute maximum total supply voltage (V+ to V–) for LT1809CS6#TRPBF is 12.6 V. Operation beyond this rating risks permanent damage. The device is fully specified from 2.5 V to 12.6 V, with guaranteed performance at 3 V, 5 V, and ±5 V supplies. Always observe derating guidelines per the manufacturer's thermal resistance data (θJA = 145°C/W for TSOT-23).

Does LT1809CS6#TRPBF support rail-to-rail input with a single 3.3 V supply?

Yes, LT1809CS6#TRPBF supports true rail-to-rail input - its input common-mode range extends from V– to V+, meaning it accepts signals from 0 V to 3.3 V when powered from a single 3.3 V supply. This eliminates the need for level-shifting or negative biasing in low-voltage sensor interfaces, and is confirmed in the Electrical Characteristics table under "Input Common Mode Range".

What is the typical THD performance of LT1809CS6#TRPBF at 5 MHz?

The typical total harmonic distortion (THD) of LT1809CS6#TRPBF is –90 dBc at 5 MHz, measured under conditions of AV = 1, RL = 1 kΩ, and VO = 2 VP-P with ±5 V supplies. This value is explicitly listed in the Electrical Characteristics table on page 7 of the datasheet and is critical for high-fidelity signal chain applications such as 12-bit data acquisition systems.

How does the shutdown feature of LT1809CS6#TRPBF behave during power-up?

LT1809CS6#TRPBF enters normal operation when SHDN is left open or pulled high (≥VS – 0.5 V); it enters shutdown when SHDN is pulled low (≤0.3 V). Turn-on time is 80 ns, and turn-off time is 50 ns - both measured with RL = 100 Ω. During power-up, the device remains disabled until SHDN reaches valid high logic, preventing output glitches. This behavior is verified in the Electrical Characteristics table (pages 4–5) and Typical Performance Characteristic G12.

Is LT1809CS6#TRPBF pin-compatible with other SOT-23-6 op amps like the LT1361 or OPA355?

No, LT1809CS6#TRPBF is not pin-compatible with LT1361 or OPA355. While all use SOT-23-6 packages, LT1809CS6#TRPBF assigns Pin 5 to SHDN - a function absent in LT1361 (Pin 5 = NC) and OPA355 (Pin 5 = NC). Its pinout matches only the LT1809 family (e.g., LT1809IS6#TRPBF). Substitution requires PCB layout revision to route the shutdown signal to Pin 5.