Analog Devices Inc./Maxim Integrated DS1812-15+T&R

Overview

DS1812-15+T&R from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring reset IC with active-high push-pull output, designed to automatically restart microprocessors after power failure. It asserts reset for 150 ms after V_CC returns to tolerance, features a 4.13 V typical V_CC trip point (±15% tolerance), operates from -40°C to +85°C, and is housed in SOT-23 package - used in embedded power sequencing and microcontroller supervision.

For engineers reviewing the DS1812-15+T&R datasheet, DS1812-15+T&R pinout, DS1812-15+T&R application, or DS1812-15+T&R equivalent, key selection considerations include reset timeout duration, trip voltage accuracy, push-pull output drive capability, operating temperature range, and SOT-23 footprint compatibility with space-constrained PCB layouts.

Technical Context

The DS1812-15+T&R implements a precision temperature-compensated voltage reference and comparator to detect V_CC deviations beyond ±15% of nominal 5 V supply. Its internal circuitry generates a power-fail signal that forces RST high during out-of-tolerance conditions and holds it active for 100–300 ms after recovery.

It delivers a push-pull active-high output capable of sourcing 350 µA at 2.4 V and sinking 10 mA at 0.4 V, with quiescent current as low as 30 µA. The device requires no external components and supports operation down to 1.2 V V_CC, enabling use in low-voltage microcontroller systems.

Key Specifications

Pinout & Package

SOT-23 surface-mount package (3-pin, 1.3 mm × 2.9 mm footprint), RoHS-compliant, tape-and-reel format (T&R).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-monitoring reset applications.

Compared with TPS3808G15DBVR and MAX6326UT29D3+, the DS1812-15+T&R offers factory-trimmed 4.13 V trip accuracy without external components and native push-pull drive - simplifying design for 5 V microcontroller reset in cost-sensitive industrial applications.

Availability

DS1812-15+T&R is available at Aetrix Electronics and suitable for industrial control panels, portable medical devices, and smart metering systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for DS1812-15+T&R 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 Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The DS1812-15+T&R belongs to Maxim's EconoReset™ family - engineered for cost-effective, single-chip power-supply monitoring and microprocessor reset generation in resource-constrained embedded systems.

FAQ

What is the exact V_CC trip voltage range for DS1812-15+T&R?

The DS1812-15+T&R has a guaranteed V_CC trip point range of 4.00 V (minimum), 4.13 V (typical), and 4.24 V (maximum) - calibrated for ±15% tolerance around a nominal 5 V supply. This specification is tested and verified across the full -40°C to +85°C operating temperature range and is traceable to Maxim's production test data.

Does DS1812-15+T&R require an external pull-up resistor on the RST pin?

No, DS1812-15+T&R does not require an external pull-up resistor because it features a push-pull active-high output stage. The RST pin actively drives high during reset assertion and actively pulls low when released, eliminating reliance on external biasing components and reducing BOM count and PCB area.

What is the reset timeout duration of DS1812-15+T&R after V_CC recovery?

The DS1812-15+T&R holds the RST output active for a guaranteed minimum of 100 ms, typical 150 ms, and maximum 300 ms after V_CC returns to within tolerance. This timing is internally generated and independent of external capacitors or resistors, ensuring repeatable power-up sequencing across units and temperatures.

Can DS1812-15+T&R operate with supply voltages below 5 V?

Yes, DS1812-15+T&R supports V_CC from 1.2 V to 5.5 V. Its internal reference and comparator remain functional down to 1.2 V, though the 4.13 V trip point is optimized for 5 V systems. At lower V_CC, the device continues monitoring but may assert reset earlier due to relative voltage margin - verify timing under actual operating conditions.

Is DS1812-15+T&R compatible with both TO-92 and SOT-23 packages?

No - DS1812-15+T&R specifically denotes the SOT-23 surface-mount package in tape-and-reel format (T&R). While the DS1812 family includes TO-92 variants (e.g., DS1812-15+), the "+T&R" suffix confirms this part is supplied only in SOT-23 packaging with standardized reel dimensions and orientation per JEDEC standards.