Analog Devices Inc./Maxim Integrated DS1812-15

Overview

DS1812-15 from Maxim Integrated (now Analog Devices) is a precision voltage supervisor IC that monitors V_CC and asserts an active-high reset signal during power failure or brownout. It features a 4.00–4.24 V trip point, 150 ms minimum reset pulse width, push-pull output, and operates from -40°C to +85°C in TO-92 or SOT-23 packages - used for reliable microprocessor reset conditioning in embedded power management.

For engineers reviewing the DS1812-15 datasheet, DS1812-15 pinout, DS1812-15 application, or DS1812-15 equivalent, key selection criteria include V_CC trip accuracy, guaranteed reset timeout, active-high push-pull drive capability, operating temperature range, and package compatibility with space-constrained PCB layouts.

Technical Context

The DS1812-15 implements a precision bandgap voltage reference and comparator-based monitoring circuit to detect when V_CC falls below its specified 4.00–4.24 V threshold. Its internal timing circuit ensures RST remains asserted for ≥100 ms (typ. 150 ms) after V_CC recovers to tolerance.

No external components are required: the device integrates all sensing, reference, comparison, and timing functions. The push-pull CMOS output drives directly into microcontroller reset inputs without pull-up resistors, supporting logic-level compatibility across 1.2 V to 5.5 V supply rails.

Key Specifications

Pinout & Package

DS1812-15 is available in TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Both share identical pin assignment and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB29DBZR and MAX809SEUR+T, the DS1812-15 offers a unique combination of 4.00–4.24 V trip accuracy, active-high push-pull output, and 150 ms guaranteed reset hold time - enabling direct replacement in 5 V microprocessor reset circuits without layout or firmware changes.

Availability

DS1812-15 is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and medical handheld diagnostics requiring stable component supply and long-term lifecycle assurance.

Supply support for DS1812-15 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) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, control, and reliability-critical systems.

The DS1812-15 belongs to Maxim's EconoReset™ family - engineered for cost-sensitive, space-constrained embedded applications requiring accurate, single-supply voltage supervision with minimal external components.

FAQ

What is the exact V_CC trip point range for DS1812-15?

The DS1812-15 has a guaranteed V_CC trip point range of 4.00 V to 4.24 V at +25°C, with temperature compensation maintaining accuracy across -40°C to +85°C. This range is factory-trimmed and specified in the DC Electrical Characteristics table of the official DS1812 datasheet. The "-15" suffix denotes the 15% tolerance grade, corresponding to the 4.00–4.24 V window for 5 V nominal systems.

Does DS1812-15 require an external pull-up resistor on the RST pin?

No, DS1812-15 does not require an external pull-up resistor. Its RST output is a push-pull CMOS driver capable of sourcing up to 350 µA and sinking up to 10 mA. This allows direct connection to standard microcontroller reset inputs without additional components - a key differentiator from open-drain supervisors like the TLV803 series.

Can DS1812-15 operate from a 3.3 V supply?

Yes, DS1812-15 operates from 1.2 V to 5.5 V, including 3.3 V nominal supplies. However, its 4.00–4.24 V trip point means it will assert reset continuously when powered from 3.3 V, as V_CC remains below threshold. It is intended for supervision of 5 V rails or higher; for 3.3 V systems, consider DS1812-33 or other variants with lower trip points.

What is the minimum reset pulse width guaranteed by DS1812-15?

DS1812-15 guarantees a minimum reset pulse width of 100 ms, with typical duration of 150 ms and maximum of 300 ms. This timing is internally generated and independent of external capacitors or resistors, ensuring consistent reset hold time across temperature, voltage, and process variations - critical for reliable microprocessor initialization.

Which packages are available for DS1812-15?

DS1812-15 is offered in both TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Pinout is identical across both: Pin 1 = RST, Pin 2 = V_CC, Pin 3 = GND. Mechanical drawings for both packages are published in the DS1812 datasheet's Mechanical Drawings section on the Analog Devices website.