Analog Devices Inc./Maxim Integrated MAX6386XS46D3-T

Overview

MAX6386XS46D3-T from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 4.63V reset threshold, 140ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supply rails in battery-powered or space-constrained embedded systems and guarantees valid reset output down to VCC = 1V. Designed for critical μP power-up sequencing, it consumes only 3μA at +1.8V.

For engineers reviewing the MAX6386XS46D3-T datasheet, MAX6386XS46D3-T pinout, MAX6386XS46D3-T application, or MAX6386XS46D3-T equivalent, key selection criteria include its 4.63V ±2.5% threshold accuracy over –40°C to +125°C, 140ms reset timeout, SC70-4 package footprint, MR input with internal 63kΩ pullup, and open-drain RESET output requiring external pullup.

Technical Context

The MAX6386XS46D3-T implements a precision voltage comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic timer that enforces a guaranteed-minimum 140ms reset assertion after VCC rises above 4.63V. Its open-drain RESET output supports wired-OR configurations and level-shifting, while the MR input features built-in debounce and TTL/CMOS-compatible logic thresholds.

This device belongs to the MAX6384–MAX6390 family of single-supply supervisors, distinguished by 4-pin SC70 packaging, absence of auxiliary RESET IN, and inclusion of MR functionality - unlike MAX6381–MAX6383 (no MR) or MAX6387–MAX6389 (RESET IN instead of MR).

Key Specifications

Pinout & Package

MAX6386XS46D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.9mm with gull-wing leads. Thermal resistance θ_JA = 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386LT46D3-T, the MAX6386XS46D3-T offers 43% smaller PCB area but higher thermal resistance; versus TPS3808G33DBVR, it provides precise 4.63V detection and MR capability essential for field-serviceable equipment, at the cost of non-drop-in replacement.

Availability

MAX6386XS46D3-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical monitors, automotive body control units, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6386XS46D3-T 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, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed reset supervision in miniature SC70/μDFN packages - engineered specifically for space- and power-constrained embedded systems demanding high reliability across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6386XS46D3-T and how accurate is it over temperature?

The MAX6386XS46D3-T has a nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" (V_TH) and validated across production lots per Maxim's datasheet Rev 7. The 46 suffix explicitly denotes the 4.63V variant.

Does MAX6386XS46D3-T require an external pullup resistor on the RESET pin, and why?

Yes, MAX6386XS46D3-T requires an external pullup resistor on the RESET pin because it features an open-drain active-low output. Without a pullup, the RESET line would float high and fail to drive downstream logic. A typical value is 10kΩ to 100kΩ connected to the target logic rail (e.g., 3.3V or 5V), as specified in the Typical Operating Circuit on page 9 of the MAX6381–MAX6390 datasheet.

What is the function and electrical behavior of the MR pin on MAX6386XS46D3-T?

The MR pin on MAX6386XS46D3-T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR ≤0.3×VCC asserts RESET for the full 140ms timeout period, even if MR is released earlier. MR accepts TTL/CMOS logic levels and supports direct connection to a momentary switch to GND - no external components are needed for basic operation.

Can MAX6386XS46D3-T operate reliably at VCC = 1.2V, and what happens to the RESET output below 1.8V?

Yes, MAX6386XS46D3-T is fully specified to operate down to VCC = 1.0V, and its RESET output state is guaranteed valid at all voltages ≥1.0V. Below 1.8V, supply current drops to ~4μA (per ICC specs), and VOL remains ≤0.3V at ISINK = 80μA - ensuring clean logic-low assertion even during deep brownout conditions common in battery-depleted systems.

Is MAX6386XS46D3-T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?

MAX6386XS46D3-T is not pin-compatible with MAX809 (3-pin SOT-23) or MAX6326 (3-pin SOT-23), as it uses a 4-pin SC70 package with dedicated MR and RESET pins. However, it is functionally compatible and listed in the datasheet as pin-compatible with other 4-pin SC70 variants in the MAX6384–MAX6390 family (e.g., MAX6384XS46D3-T), sharing identical pinout and footprint.