Analog Devices Inc./Maxim Integrated MAX6379XR37+

Overview

MAX6379XR37+ from Maxim Integrated is an ultra-low-power, active-high push-pull voltage detector designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 3.70V threshold (±2.5% over temperature), 500nA supply current, and guaranteed operation down to 1V VCC. It asserts a logic-high output when VCC falls below the threshold and is used in portable equipment power sequencing and Li+-battery voltage supervision.

For engineers reviewing the MAX6379XR37+ datasheet, MAX6379XR37+ pinout, MAX6379XR37+ application, or MAX6379XR37+ equivalent, key selection criteria include reset threshold accuracy, ultra-low quiescent current, push-pull output drive capability, transient immunity, and SC70-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6379XR37+ integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 3.70V detection without external components. Its internal hysteresis of 100mV prevents chatter during slow VCC decay.

Designed for immunity to fast transients, it ignores negative-going VCC glitches up to 200µs at 100mV overdrive. The push-pull output drives high (VOH ≥ 0.8×VCC) with 500µA source current and low (VOL ≤ 0.4V) with 1.2mA sink current, enabling direct interface with CMOS inputs.

Key Specifications

Pinout & Package

MAX6379XR37+ is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for ultra-compact portable designs. The package is lead-free and RoHS-compliant (indicated by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLV803EB37DBVR and TPS3808G33DBVR, the MAX6379XR37+ uniquely delivers 3.7V precision detection, active-high push-pull drive, and sub-µA operation in a 3-pin SC70 - enabling smaller size, simpler layout, and longer battery runtime without compromise.

Availability

MAX6379XR37+ is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, and smart home remote controls requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6379XR37+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and consumer applications.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power, precision voltage monitoring in space- and energy-constrained battery-operated devices - emphasizing minimal external components, guaranteed low-VCC operation, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the MAX6379XR37+?

The MAX6379XR37+ has a factory-trimmed nominal reset threshold of 3.70V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and does not require external calibration. The 'R37' suffix explicitly denotes the 3.70V variant within the MAX6379 series, and the '+' indicates lead-free packaging. The MAX6379XR37+ maintains this threshold stability across its 1.2V to 5.5V supply range.

Does the MAX6379XR37+ require an external pull-up resistor?

No, the MAX6379XR37+ does not require an external pull-up resistor because it features an active-high push-pull output stage. Unlike open-drain supervisors, its OUT pin actively drives high (to ≥0.8×VCC) when VCC falls below 3.70V and actively drives low (to ≤0.4V) when VCC is above threshold. This eliminates the need for external biasing components, reduces PCB area, and improves noise immunity in high-impedance node environments. The MAX6379XR37+ is functionally complete with only VCC, GND, and OUT connections.

What is the minimum supply voltage at which the MAX6379XR37+ guarantees correct output logic state?

The MAX6379XR37+ guarantees correct output logic state - i.e., asserted high when VCC < 3.70V and deasserted low when VCC ≥ 3.70V - down to 1.0V VCC. This is explicitly specified in the datasheet and enables reliable operation during deep brown-out conditions, such as end-of-life battery discharge or cold-cranking in portable systems. The internal bandgap reference and comparator remain functional and monotonic across the full 1.2V to 5.5V operating range, with guaranteed behavior validated to 1V.

How does the MAX6379XR37+ handle fast transients on the VCC line?

The MAX6379XR37+ incorporates built-in transient immunity that rejects fast negative-going VCC glitches up to 200µs in duration when the overdrive (VTH – VCC) is 100mV. This is achieved through internal filtering and comparator hysteresis design, preventing spurious reset assertions caused by switching noise, ESD coupling, or connector bounce. The device's 100mV hysteresis further stabilizes the transition point, ensuring clean, chatter-free output edges. This behavior is verified across temperature and documented in the "Maximum Transient Duration vs. Threshold Overdrive" graph in the MAX6379XR37+ datasheet.

What package type and dimensions does the MAX6379XR37+ use?

The MAX6379XR37+ uses the SC70-3 package: a 3-pin, surface-mount, lead-free, RoHS-compliant outline measuring 2.0mm × 2.1mm × 0.95mm (body). Pin 1 is GND, Pin 2 is OUT, and Pin 3 is VCC, with standard SC70 pinout orientation. The '+' suffix in MAX6379XR37+ confirms lead-free termination. This package offers the smallest footprint among the MAX6375–MAX6380 family and is compatible with standard reflow soldering processes. It is distinct from the SOT23-3 variant (e.g., MAX6379UR37+), which measures 2.9mm × 1.6mm × 1.1mm.