Analog Devices Inc./Maxim Integrated MXD1812XR41+

Overview

MXD1812XR41+ from Maxim Integrated is a low-power microprocessor reset supervisor IC with active-high push-pull RESET output, factory-set 4.12V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors +5V power supplies in embedded controllers and portable systems, asserting RESET when VCC falls below threshold and holding it high for ≥100ms after recovery.

For engineers reviewing the MXD1812XR41+ datasheet, MXD1812XR41+ pinout, MXD1812XR41+ application, or MXD1812XR41+ equivalent, key selection factors include its SC70-3 package, 4μA supply current, guaranteed logic validity at low VCC, immunity to fast VCC transients, and compatibility with manual-reset–free designs requiring active-high assertion.

Technical Context

The MXD1812XR41+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and push-pull output stage-no external components required. Its reset threshold is factory-trimmed to 4.12V (min 4.00V, max 4.24V) and remains stable across –40°C to +105°C with ±2.5% accuracy.

It features a fixed 100ms (min) reset timeout period triggered on VCC rise above threshold, and guarantees valid RESET output even as VCC drops to +1V. The device ignores negative-going VCC transients ≤200mV overdrive for durations under 10µs, per typical operating characteristics.

Key Specifications

Pinout & Package

MXD1812XR41+ is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with pin 1 = RESET (active-high push-pull), pin 2 = VCC (supply and threshold monitor input), and pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MXD1812XR41+, MAX809TR41+T offers lower quiescent current but mandates external biasing and cannot drive active-high inputs directly, while TPS3808G33DBVR targets different voltage domains and adds design complexity with external timing components-neither provides the same combination of +5V-specific threshold, active-high push-pull output, and SC70 footprint.

Availability

MXD1812XR41+ is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1812XR41+ 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, communications, and consumer applications, emphasizing reliability, integration, and low-power operation.

The MXD1810–MXD1818 family was developed specifically for cost-sensitive, space-constrained microprocessor systems requiring robust, single-chip power-supply monitoring without external components.

FAQ

What is the reset threshold voltage of the MXD1812XR41+?

The MXD1812XR41+ has a factory-set reset threshold of 4.12V, with a guaranteed range of 4.00V to 4.24V over temperature. This value is laser-trimmed during production and specified with ±2.5% accuracy from –40°C to +105°C, making it suitable for precise monitoring of +5V power rails in industrial and portable systems. The MXD1812XR41+ uses this threshold to assert its active-high RESET output whenever VCC falls below the trip point.

Does the MXD1812XR41+ support manual reset functionality?

No, the MXD1812XR41+ does not include manual reset capability. Manual reset with debounced push-button detection is exclusive to the MXD1813/MXD1818 variants in the family. The MXD1812XR41+ provides only power-supply–monitored reset assertion and deassertion, with no dedicated RESET input pin for external triggering. Its pinout consists solely of RESET (output), VCC, and GND-confirming its role as a dedicated supply supervisor without user-initiated reset control.

What package type and footprint does the MXD1812XR41+ use?

The MXD1812XR41+ is supplied in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.65mm pitch. This ultra-compact footprint is optimized for high-density PCB layouts in portable and space-constrained applications. The "X" in the part number explicitly denotes the SC70 variant, distinguishing it from the SOT23-3 version (MXD1812UR41+). No adapter or redesign is needed when selecting the SC70 option for miniaturized designs.

Can the MXD1812XR41+ operate reliably at low supply voltages?

Yes, the MXD1812XR41+ guarantees correct logic state on its RESET output down to VCC = +1V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions-critical for fail-safe operation in battery-powered devices. Unlike open-drain variants, its push-pull output maintains defined high/low states without external biasing, even as VCC declines below typical operating ranges. This feature is intrinsic to the MXD1812XR41+ design and validated across the full –40°C to +105°C temperature range.

How does the MXD1812XR41+ handle power supply transients?

The MXD1812XR41+ incorporates transient immunity via a comparator architecture designed to ignore fast negative-going VCC glitches. Per typical operating characteristics, it suppresses reset pulses for transients up to 10µs wide when the overdrive (VTH – VCC) is 200mV-effectively rejecting common switching noise. This behavior is inherent to the MXD1812XR41+'s internal design and does not require external filtering. The specification ensures robust operation in electrically noisy environments such as motor-driven industrial controls or switch-mode power supply domains where the MXD1812XR41+ is commonly deployed.