Analog Devices Inc./Maxim Integrated MAX6386LT46D3+

Overview

MAX6386LT46D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.63V reset threshold (±2.5% over −40°C to +125°C), and 140ms minimum VCC reset timeout. It monitors single supply voltage in battery-powered or embedded systems and guarantees valid reset state down to VCC = 1V. Designed for critical μP power-up sequencing in portable instrumentation.

For engineers reviewing the MAX6386LT46D3+ datasheet, MAX6386LT46D3+ pinout, MAX6386LT46D3+ application, or MAX6386LT46D3+ equivalent, key selection factors include its 4.63V threshold accuracy, 140ms reset timeout, open-drain output requiring external pullup, debounced manual reset input (MR), and 6-pin μDFN package with guaranteed operation at 1.0V VCC.

Technical Context

The MAX6386LT46D3+ implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 4.63V threshold, with ±2.5% tolerance across −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC rises above threshold.

It features a debounced active-low manual reset input (MR) with 63kΩ internal pullup, supporting TTL/CMOS logic drive and noise immunity via optional 0.1μF capacitor to GND. The open-drain RESET output requires an external pullup resistor and sinks up to 3.2mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V.

Key Specifications

Pinout & Package

MAX6386LT46D3+ is housed in a 6-pin μDFN package (1.5mm × 1.5mm, 0.5mm pitch, 0.8mm height) with wettable flanks, RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR46D3+T, MAX6386LT46D3+ offers MR functionality in compact μDFN but requires external pullup; versus TPS3808G33DBVR, it delivers precise 4.63V detection for 5V systems without added watchdog complexity or mismatched threshold.

Availability

MAX6386LT46D3+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, battery-powered equipment, and critical microprocessor power monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MAX6386LT46D3+ 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, automotive, communications, and computing applications.

MAX6386LT46D3+ belongs to the MAX6381–MAX6390 family of low-power μP supervisors, engineered specifically for reliable power-on reset generation in space-constrained, battery-sensitive embedded systems operating across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6386LT46D3+ and how stable is it over temperature?

The MAX6386LT46D3+ has a factory-set nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of −40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning threshold drift is limited to approximately ±12mV across the entire range. This stability ensures consistent brownout detection in automotive and industrial environments where ambient temperature varies widely. The MAX6386LT46D3+ maintains this specification without external calibration components.

Does MAX6386LT46D3+ support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6386LT46D3+ includes a debounced active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <1.39V at VCC = 4.63V). The input accepts TTL/CMOS logic levels and open-drain signals. Minimum pulse width is 1µs, and it rejects glitches shorter than 100ns. If unused, MR may be left floating due to the internal pullup. For noisy environments, a 0.1μF capacitor from MR to GND improves immunity. This feature is integral to the MAX6386LT46D3+ design and requires no external components.

What package type and footprint does MAX6386LT46D3+ use, and are soldering guidelines available?

MAX6386LT46D3+ uses a 6-pin μDFN package (1.5mm × 1.5mm, 0.5mm pitch, 0.8mm height) with wettable flanks and RoHS-compliant lead-free finish. Land pattern number 90-0080 applies, and thermal resistance is θJA = 477°C/W on multilayer board. Reflow soldering follows JEDEC J-STD-020 profile with peak temperature +260°C. The package supports automated optical inspection (AOI) due to exposed pad visibility. This μDFN variant is standard for MAX6386LT46D3+ and differs from SC70 options in the same family.

Can MAX6386LT46D3+ operate reliably at very low supply voltages, and what happens to the RESET output below 1.8V?

Yes, MAX6386LT46D3+ guarantees correct reset output behavior down to VCC = 1.0V - well below typical 1.8V logic thresholds. Its open-drain RESET output remains functional and sinks up to 80µA at VCC ≥ 1.0V while maintaining VOL ≤ 0.3V. Below 1.0V, the device ceases operation, but the reset line stays asserted (low) due to external pullup. This ensures fail-safe behavior during deep brownout. The MAX6386LT46D3+ datasheet explicitly specifies operation from 1.0V to 5.5V, making it suitable for ultra-low-voltage backup scenarios.

Is MAX6386LT46D3+ pin-compatible with other members of the MAX6381–MAX6390 family, and which variants share the same 6-pin μDFN layout?

MAX6386LT46D3+ shares identical 6-pin μDFN pinout with all LT-suffix variants in the MAX6381–MAX6390 family, including MAX6381LTxxDx+, MAX6382LTxxDx+, MAX6384LTxxDx+, MAX6387LTxxDx+, and MAX6390LTxxDx+. Pin 1 = GND, Pin 2 = VCC, Pin 3 = N.C., Pin 4 = MR, Pin 5 = N.C., Pin 6 = RESET. This uniformity allows drop-in replacement within the same package footprint when changing reset threshold or timeout - provided output type (open-drain here) and MR presence match system requirements. The MAX6386LT46D3+ pin mapping is fully documented in the official Maxim datasheet.