Analog Devices Inc./Maxim Integrated DS1810R-15-U+

Overview

DS1810R-15-U+ from Maxim Integrated is a 5V supply voltage supervisor IC with 15% trip-point tolerance, push-pull active-low reset output, 150 ms reset timeout, and operation from -40°C to +85°C in SOT-23 package. It monitors VCC and asserts RST during power failure or brownout, enabling reliable microprocessor restart in embedded control systems.

For engineers reviewing the DS1810R-15-U+ datasheet, DS1810R-15-U+ pinout, DS1810R-15-U+ application, or DS1810R-15-U+ equivalent, key selection criteria include VCC trip point (4.00–4.24 V), guaranteed 150 ms reset hold time after VCC recovery, push-pull output capable of sinking 10 mA at 0.4 V, and valid RST operation down to VCC = 1.2 V - critical for low-voltage sequencing and fail-safe boot integrity.

Technical Context

The DS1810R-15-U+ integrates a precision temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions. Its internal circuitry triggers an active-low reset pulse when VCC drops below the 4.00–4.24 V threshold, and maintains RST active for 100–300 ms after VCC returns to spec.

Unlike open-drain supervisors, the DS1810R-15-U+ uses a push-pull output stage that actively drives both high and low states without requiring an external pull-up resistor. This reduces BOM count and ensures valid logic levels even as VCC decays to 1.2 V - supporting robust power-down signaling in battery-backed or energy-harvesting systems.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package (5.0 mm × 2.8 mm × 1.45 mm), RoHS-compliant, lead-free, with gull-wing leads and standard JEDEC MO-178 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G15DBVR, the DS1810R-15-U+ delivers guaranteed 15% trip tolerance with push-pull output and full functionality down to 1.2 V - making it optimal for cost-constrained, space-limited industrial and metering applications where precise brownout detection and minimal external components are prioritized over adjustable thresholds or sub-1% accuracy.

Availability

DS1810R-15-U+ is available at Aetrix Electronics and suitable for industrial PLC control, smart metering, medical diagnostic equipment, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for DS1810R-15-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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The DS1810R-15-U+ belongs to Maxim's EconoReset family of low-cost, precision voltage supervisors designed for reliable microprocessor reset generation in cost-sensitive embedded systems with strict space and BOM constraints.

FAQ

What is the exact VCC trip point range for DS1810R-15-U+?

The DS1810R-15-U+ has a guaranteed VCC trip point range of 4.00 V to 4.24 V, corresponding to a nominal 5V supply with ±15% tolerance. This specification is tested and characterized across the full -40°C to +85°C operating temperature range and applies to all units shipped under this part number. The trip point is set by an internal precision temperature-compensated reference, not adjustable externally.

Does DS1810R-15-U+ require an external pull-up resistor on the RST pin?

No, the DS1810R-15-U+ features a push-pull output stage that actively drives both high and low logic states on the RST pin. Unlike open-drain supervisors, it does not require an external pull-up resistor - reducing component count, PCB area, and potential noise coupling. The output can source up to 350 µA and sink up to 10 mA, compatible with standard CMOS and TTL inputs.

Can DS1810R-15-U+ operate reliably below 1.2 V VCC?

No - the DS1810R-15-U+ is specified to maintain valid output behavior only down to VCC = 1.2 V. Below this voltage, internal circuitry may become nonfunctional, and RST output state is not guaranteed. However, the device supports a design technique using an external 100 kΩ resistor from RST to GND to extend valid low-state assertion down to 0 V VCC during power-down, as documented in Figure 3 of the datasheet.

What is the reset timeout duration for DS1810R-15-U+?

The DS1810R-15-U+ provides a reset timeout of 100–300 ms after VCC returns to within tolerance. The typical value is 150 ms, which ensures sufficient time for power supply stabilization and microprocessor clock lock before releasing the reset signal. This parameter is independent of VCC slew rate and is internally generated by a precision RC timing circuit.

Is DS1810R-15-U+ RoHS-compliant and lead-free?

Yes, DS1810R-15-U+ is RoHS-compliant and lead-free, as indicated by the "+" suffix in the part number per Maxim's naming convention. It meets EU RoHS Directive 2011/65/EU requirements and is manufactured using lead-free solderable terminations. The SOT-23 package uses matte tin plating and complies with JEDEC J-STD-020 moisture sensitivity level 1.