Analog Devices Inc. LTC1841CS8#TRPBF

Overview

LTC1841CS8#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow power dual comparator IC with rail-to-rail input operation, open-drain outputs, and no internal reference. It operates from a single 2V–11V or dual ±1V–±5.5V supply, draws only 3.5µA typical supply current, and delivers 12µs propagation delay with 10mV overdrive - enabling precision battery monitoring in portable medical sensors and IoT edge nodes.

For engineers reviewing the LTC1841CS8#TRPBF datasheet, LTC1841CS8#TRPBF pinout, LTC1841CS8#TRPBF application, or LTC1841CS8#TRPBF equivalent, key selection criteria include its 20mA output sink capability, input common-mode range extending to V– and within 1.3V of V+, absence of integrated reference, and SO-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC1841CS8#TRPBF implements two independent comparators with input stages designed for operation down to the negative rail and up to V+ – 1.3V, eliminating level-shifting needs in single-supply systems. Its open-drain outputs support wired-OR logic and flexible pull-up voltage selection, while elimination of cross-conduction current during state transitions prevents supply glitches.

Unlike LTC1842/LTC1843 variants, LTC1841CS8#TRPBF lacks a built-in reference and hysteresis control pin; its pin 4 is IN A– and pin 5 is IN B–, enabling true dual inverting/noninverting configuration without reference routing constraints. This makes it suitable for threshold detection where external references or resistor dividers define trip points.

Key Specifications

Pinout & Package

Package: 8-lead plastic SO (SO-8, narrow 0.150"), JEDEC MS-012AC, 3.9mm × 4.9mm body, 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual comparator applications.

Compared with LTC1441CS8#TRPBF and TLV3702IDR, LTC1841CS8#TRPBF uniquely balances sub-4µA operation, open-drain flexibility, and rail-to-rail input range - making it optimal for battery-critical applications requiring both low power and interface adaptability without integrated reference constraints.

Availability

LTC1841CS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detection, window comparator circuits, and power sequencing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC1841CS8#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 precision analog portfolio, known for high-performance op amps, comparators, and power management ICs targeting industrial, automotive, and medical markets.

The LTC1841CS8#TRPBF belongs to Linear's ultralow power comparator family, designed specifically for energy-constrained applications where nanoscale supply current, robust input range, and reliable open-drain outputs are essential for battery longevity and system safety.

FAQ

Does LTC1841CS8#TRPBF include an internal voltage reference?

No, LTC1841CS8#TRPBF does not include an internal voltage reference. Unlike LTC1842/LTC1843 variants, it is a dual comparator-only device requiring an external reference or resistor divider for threshold setting. This design provides full flexibility in reference selection - such as precision bandgap, DAC output, or thermistor-based voltage - without compromising quiescent current or accuracy.

What is the maximum sink current capability of LTC1841CS8#TRPBF outputs?

LTC1841CS8#TRPBF outputs can typically sink greater than 20mA each under standard conditions (V+ = 5V, TA = 25°C). This allows direct driving of LEDs, small relays, or MOSFET gates without external buffers. The actual sink current varies with supply voltage and temperature; at V+ = 2V, minimum guaranteed sink is 8mA, supporting operation down to near-dead battery voltages.

Can LTC1841CS8#TRPBF operate from a single 3.3V supply?

Yes, LTC1841CS8#TRPBF operates from a single 2V to 11V supply, fully supporting 3.3V systems. Its input common-mode range extends from V– (ground) to V+ – 1.3V (2.0V), enabling accurate sensing of signals up to 2.0V with respect to ground. Output low voltage is V– + 0.4V, ensuring clean logic-low assertion into 3.3V CMOS inputs.

How does LTC1841CS8#TRPBF eliminate supply glitches during comparator switching?

LTC1841CS8#TRPBF eliminates supply glitches by removing cross-conduction current that normally flows between P-channel and N-channel devices in the output stage during logic transitions. This architecture prevents momentary short-circuit currents into the supply rail, which could otherwise cause voltage droop or noise coupling into sensitive analog sections - a critical advantage in mixed-signal battery-powered systems.

Is LTC1841CS8#TRPBF pin-compatible with LTC1842CS8#TRPBF or LTC1843CS8#TRPBF?

No, LTC1841CS8#TRPBF is not pin-compatible with LTC1842CS8#TRPBF or LTC1843CS8#TRPBF. While all three share the SO-8 package, pin functions differ significantly: LTC1841 uses Pin 4 as IN A– and Pin 5 as IN B–, whereas LTC1842/LTC1843 assign Pin 4 to IN B+ or IN B– and Pin 5 to HYST. Substituting without PCB revision will result in incorrect functionality or damage.