Analog Devices Inc./Maxim Integrated DS1811R-10-U

Overview

DS1811R-10-U from Maxim Integrated (now part of Analog Devices) is a 5V supply voltage supervisor IC with open-drain active-low reset output, 4.25V to 4.49V trip threshold, 150ms reset pulse width, and SOT-23-3 package. It monitors VCC and asserts RST during power failure or brownout to ensure reliable microprocessor startup in embedded control systems.

For engineers reviewing the DS1811R-10-U datasheet, DS1811R-10-U pinout, DS1811R-10-U application, or DS1811R-10-U equivalent, key selection factors include its guaranteed 4.35V typical trip point, internal 5.5kΩ pull-up resistor, -40°C to +85°C operating range, open-drain RST output compatibility with 3.3V/5V logic, and TO-92/SOT-23 dual-package availability.

Technical Context

The DS1811R-10-U implements a precision temperature-compensated bandgap voltage reference and comparator to detect VCC deviations beyond ±10% of nominal 5V. Its internal circuitry generates a power-fail signal that forces RST low immediately upon out-of-tolerance detection.

After VCC returns within tolerance, the device holds RST active for 100–300ms (typical 150ms) to allow system stabilization. The open-drain output supports wired-OR configurations and interfaces directly with microcontroller reset inputs requiring active-low assertion.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint and gull-wing leads; compatible with automated pick-and-place and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6326–43D and TPS3808G12DBVR, the DS1811R-10-U offers lower system cost through integrated pull-up and fixed 4.35V trip optimized for legacy 5V designs, while maintaining industrial temperature range and proven reliability in metering and control applications.

Availability

DS1811R-10-U is available at Aetrix Electronics and suitable for industrial automation, smart metering, and network infrastructure applications requiring stable component supply and long-term lifecycle support.

Supply support for DS1811R-10-U 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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets.

The DS1811R-10-U belongs to the EconoReset™ family of low-cost voltage supervisors engineered for cost-sensitive embedded systems requiring robust power-on reset and brownout protection without external components.

FAQ

What is the exact VCC trip voltage range for DS1811R-10-U?

The DS1811R-10-U has a guaranteed VCC trip point range of 4.25V (minimum) to 4.49V (maximum), with a typical value of 4.35V at 25°C. This ±10% tolerance around 5V ensures reliable detection of brownout conditions while avoiding nuisance resets during normal ripple. The trip point remains stable across the full -40°C to +85°C operating temperature range due to internal temperature compensation.

Does DS1811R-10-U require an external pull-up resistor on the RST pin?

No, the DS1811R-10-U includes an internal 5.5kΩ pull-up resistor on the open-drain RST output, eliminating the need for an external component in standard 5V systems. This simplifies PCB layout and reduces BOM count. An external pull-up may be added only if interfacing with logic families requiring stronger drive or voltages exceeding 5V.

How long does the DS1811R-10-U hold the reset signal active after VCC recovery?

The DS1811R-10-U holds the RST signal active for 100ms to 300ms after VCC returns to within tolerance, with a typical duration of 150ms. This guaranteed minimum hold time ensures microprocessors and peripherals have sufficient time to stabilize before release, preventing premature execution and memory corruption during power-up sequences.

Can DS1811R-10-U be used in 3.3V systems?

The DS1811R-10-U is specified for 5V nominal operation with a trip range centered at 4.35V; it is not designed for direct use in 3.3V systems. For 3.3V rails, consider alternatives like the DS1832 or TPS3808G01. Using DS1811R-10-U on a 3.3V supply would result in continuous reset assertion since VCC remains below the 4.25V minimum trip threshold.

What package options are available for DS1811R-10-U?

The DS1811R-10-U is available in both SOT-23-3 and TO-92 packages. The SOT-23-3 variant (used in DS1811R-10-U) measures 1.3mm × 2.9mm and supports surface-mount assembly. The TO-92 version provides through-hole compatibility for prototyping or legacy designs. Both share identical pinout: Pin 1 = RST, Pin 2 = VCC, Pin 3 = GND.