Analog Devices Inc./Maxim Integrated MAX6381XR43D2+T

Overview

MAX6381XR43D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 4.30V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and active-low push-pull reset output. It monitors VCC from +1.8V to +5.0V while drawing only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered industrial controllers requiring reliable brownout protection.

For engineers reviewing the MAX6381XR43D2+T datasheet, MAX6381XR43D2+T pinout, MAX6381XR43D2+T application, or MAX6381XR43D2+T equivalent, key selection criteria include its precise 4.30V reset threshold tolerance, 20ms timeout timing, SC70 footprint compatibility, and guaranteed operation at VCC ≥ 1V for deep undervoltage detection.

Technical Context

The MAX6381XR43D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco, paired with a monolithic RC timer generating a fixed 20ms minimum reset assertion period after VCC recovery. Its push-pull active-low RESET output drives directly into μP reset inputs without external pullup.

No manual reset (MR) or auxiliary RESET IN functionality is included - this variant belongs to the base MAX6381 series, distinguishing it from MR-equipped MAX6384–MAX6386 or dual-monitor MAX6387–MAX6389 families. The device operates with VCC as low as 1.0V, ensuring deterministic reset behavior during severe brownouts.

Key Specifications

Pinout & Package

MAX6381XR43D2+T uses a 3-pin SC70 package (outline 21-0075) with exposed pad not electrically connected. Pin 1 is RESET (active-low push-pull), Pin 2 is VCC, and Pin 3 is GND - no NC pins or auxiliary functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6381XR43D2+T, MAX809TRD2+T offers longer reset hold time but sacrifices low-power performance and temperature range; TLV809K43DBZR improves initial accuracy but cannot replace MAX6381XR43D2+T in -40°C to +125°C deployments.

Availability

MAX6381XR43D2+T is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, portable medical sensors, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6381XR43D2+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP reset supervision with multiple threshold/timing options and AEC-Q100 variants for mission-critical power monitoring.

FAQ

What is the exact reset threshold voltage of MAX6381XR43D2+T and how stable is it over temperature?

The MAX6381XR43D2+T has a factory-trimmed nominal reset threshold of 4.30V, with guaranteed accuracy of ±2.5% over the full operating range of -40°C to +125°C and a tempco of 60ppm/°C. This stability ensures consistent brownout detection in automotive and industrial environments where ambient temperature swings are extreme, and the device maintains specification compliance without external calibration.

Does MAX6381XR43D2+T support manual reset functionality?

No, MAX6381XR43D2+T does not include a manual reset (MR) input. It belongs to the base MAX6381 series, which lacks MR capability - unlike MAX6384–MAX6386 or MAX6390 variants. The device relies solely on VCC monitoring and automatic reset assertion; any external reset initiation must be handled by separate circuitry interfacing with the μP's reset line.

What is the minimum VCC voltage at which MAX6381XR43D2+T guarantees correct reset output logic state?

MAX6381XR43D2+T guarantees valid reset output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined output behavior. This feature allows reliable detection of deep brownout conditions before the μP enters undefined operation, making MAX6381XR43D2+T suitable for safety-critical applications where early fault indication is essential.

Can MAX6381XR43D2+T be used in automotive applications?

Yes, MAX6381XR43D2+T is AEC-Q100 qualified for automotive use. Its -40°C to +125°C operating temperature range, robust negative-going transient immunity (rejecting ≤35µs glitches), and guaranteed reset behavior down to VCC = 1V meet stringent automotive reliability requirements. The "/V" suffix denotes automotive qualification, and MAX6381XR43D2+T is offered in that grade.

What package type and footprint does MAX6381XR43D2+T use, and is it compatible with standard reflow processes?

MAX6381XR43D2+T uses a RoHS-compliant 3-pin SC70 package (outline 21-0075) with 1.25mm × 0.85mm dimensions and 0.65mm pitch. It is qualified for standard lead-free reflow soldering per JEDEC J-STD-020, with peak temperature up to +260°C. The package is pin-compatible with industry-standard MAX809/MAX810 supervisors, enabling direct PCB footprint reuse.