Analog Devices Inc./Maxim Integrated MAX6377XR29

Overview

MAX6377XR29 from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.93V ±2.5% over temperature, 500nA supply current, and operation down to 1V VCC. It monitors regulated system or battery voltages in portable equipment, asserting OUT low when VCC falls below threshold-used for precision brownout detection and power sequencing control.

For engineers reviewing the MAX6377XR29 datasheet, MAX6377XR29 pinout, MAX6377XR29 application, or MAX6377XR29 equivalent, this device is selected for ultra-low-quiescent-current reset supervision in space-constrained, battery-sensitive designs where transient immunity, no external components, and guaranteed logic state down to 1V are critical.

Technical Context

The MAX6377XR29 integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to set its 2.93V detection threshold without external components. Its open-drain output sinks current when asserted and requires an external pull-up to any voltage ≤5.5V.

Designed for immunity to fast VCC transients, it ignores negative-going glitches up to duration limits defined by threshold overdrive (e.g., ~140µs at 100mV overdrive). All functionality remains valid across -40°C to +85°C with propagation delay under 6.3µs (falling edge) and hysteresis of 100mV.

Key Specifications

Pinout & Package

MAX6377XR29 is housed in a 3-pin SC70 package (JEDEC MO-203AA), footprint-compatible with SOT23-3 but 30% smaller. The package supports leaded and lead-free assembly (order with "+T" suffix for RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3123QDBVRQ1 and APX803S-293T2L-7, the MAX6377XR29 delivers the lowest supply current (500nA vs. ≥900nA) and smallest footprint (SC70), making it optimal for ultra-long-life, space-constrained portable designs-though it lacks automotive qualification and requires external pull-up.

Availability

MAX6377XR29 is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smart meter backup power systems requiring stable component supply, long-lifecycle support, and high-volume tape-and-reel delivery.

Supply support for MAX6377XR29 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, medical, and communications applications.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems-prioritizing nanoscale ICC, factory-trimmed accuracy, and minimal footprint without external components.

FAQ

What is the exact reset threshold voltage of MAX6377XR29 and how stable is it over temperature?

The MAX6377XR29 has a nominal reset threshold of 2.93V, with ±2.5% accuracy guaranteed over the full -40°C to +85°C operating range. Its 40ppm/°C tempco ensures minimal drift, and hysteresis of 100mV prevents oscillation near the trip point. This stability is achieved via on-chip laser-trimmed resistors and a precision bandgap reference, eliminating need for external calibration.

Does MAX6377XR29 require an external pull-up resistor, and what is the maximum allowable pull-up voltage?

Yes, MAX6377XR29 requires an external pull-up resistor because it features an open-drain active-low output. The pull-up can connect to any logic supply from 1.8V to 5.5V - the OUT pin is rated to withstand up to 6V. For reliable low-state performance, select a resistor that ensures VOL ≤0.4V at ISINK = 100µA (per datasheet specs), typically 10kΩ–100kΩ depending on bus capacitance and speed requirements.

Can MAX6377XR29 operate reliably when VCC drops below 1.2V?

MAX6377XR29 is guaranteed to maintain correct output logic state down to VCC = 1V, though its specified operating range begins at 1.2V. Below 1.2V, the device may still assert OUT low if VCC falls below 2.93V, but timing parameters (e.g., propagation delay) and VOL are not characterized. For robust brownout detection at ultra-low voltages, rely on the guaranteed 1V functional limit-not the 1.2V minimum spec.

How does MAX6377XR29 reject power-supply transients, and what is the maximum glitch duration it ignores?

MAX6377XR29 incorporates internal filtering to reject fast negative-going VCC transients. Its immunity is quantified in the "Maximum Transient Duration vs. Threshold Overdrive" graph: at 100mV overdrive (i.e., VCC = 2.83V), it ignores glitches up to ~140µs. As overdrive increases (e.g., VCC = 2.73V), allowable duration decreases - ensuring only sustained brownouts trigger reset, not momentary noise.

Is MAX6377XR29 available in lead-free packaging, and how is it ordered?

Yes, MAX6377XR29 is available in lead-free packaging. To order the RoHS-compliant version, replace the standard "-T" suffix with "+T" - e.g., MAX6377XR29+T. The SC70-3 package supports both leaded and lead-free reflow profiles, and all units ship in tape-and-reel format with a minimum order increment of 2,500 pieces for this standard version.