Analog Devices Inc./Maxim Integrated MAX6381XR27D3-T

Overview

MAX6381XR27D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 2.70V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single-supply voltages from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered microcontroller power-up sequencing and brownout protection.

For engineers reviewing the MAX6381XR27D3-T datasheet, MAX6381XR27D3-T pinout, MAX6381XR27D3-T application, or MAX6381XR27D3-T equivalent, key selection considerations include its precise 2.70V threshold tolerance, 140ms reset hold time, open-drain output requiring external pullup, absence of manual reset input or auxiliary voltage monitor, and compatibility with space-constrained portable designs operating across industrial temperature range.

Technical Context

The MAX6381XR27D3-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full temperature range and 60ppm/°C tempco, paired with a monotonic RC-based timeout timer. Its open-drain RESET output requires an external pullup resistor and asserts low when VCC falls below 2.70V, remaining asserted for ≥140ms after VCC recovers above threshold.

No internal MR input or RESET IN comparator is present - this variant is strictly a single-supply, fixed-threshold, open-drain reset supervisor with no user-adjustable inputs. It shares pinout and functional compatibility with the MAX809/MAX810 family but adds tighter threshold accuracy and extended temperature support.

Key Specifications

Pinout & Package

3-pin SC70 package (Outline 21-0075, Land Pattern 90-0208), 2.0mm × 2.1mm body, 0.65mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6381XR27D3-T uniquely combines 2.70V threshold precision, open-drain output, and ultra-low 3μA supply current in a minimal 3-pin SC70 footprint - making it optimal for cost-sensitive, space-constrained, and battery-operated 2.7V-system designs where reset bus sharing or level translation is needed.

Availability

MAX6381XR27D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6381XR27D3-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 demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy voltage supervision for microprocessor-based systems - engineered specifically for battery longevity, thermal robustness, and seamless integration into compact, mission-critical embedded platforms.

FAQ

What is the exact reset threshold voltage of the MAX6381XR27D3-T?

The MAX6381XR27D3-T has a factory-trimmed nominal reset threshold of 2.70V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This means the actual threshold falls between 2.63V and 2.77V at any temperature within that range, ensuring consistent brownout detection across harsh environments.

Does the MAX6381XR27D3-T include a manual reset input (MR)?

No, the MAX6381XR27D3-T does not feature a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Only MAX6384–MAX6386 and MAX6390 variants include MR; the MAX6381XR27D3-T is a dedicated single-supply reset supervisor with no user-triggered reset capability.

What type of reset output does the MAX6381XR27D3-T provide, and what external components are required?

The MAX6381XR27D3-T provides an active-low open-drain RESET output. An external pullup resistor is mandatory - typically 10kΩ to 100kΩ - connected between the RESET pin and the target logic supply (e.g., 3.3V or 5V). This configuration enables wired-OR reset buses and voltage-level translation, unlike push-pull variants which drive both high and low internally.

Can the MAX6381XR27D3-T operate reliably at VCC = 1.0V?

Yes, the MAX6381XR27D3-T guarantees correct reset output logic state down to VCC = 1.0V. Its internal circuitry remains functional and the open-drain RESET output maintains defined behavior (high-impedance when deasserted, sinking capability when asserted) even at this ultra-low supply voltage - a critical feature for detecting deep brownout conditions before total power loss.

Is the MAX6381XR27D3-T AEC-Q100 qualified?

The MAX6381XR27D3-T itself is not automotive-qualified; only versions with the "/V" suffix (e.g., MAX6381XR27D3/V+T) are AEC-Q100 Grade 1 qualified. The "-T" suffix indicates tape-and-reel packaging but does not imply automotive qualification. For automotive applications, specify the /V variant to ensure compliance with stress testing and reliability requirements.