Analog Devices Inc./Maxim Integrated MAX6377UR26+T

Overview

MAX6377UR26+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.63V ±2.5%, 500nA supply current, and operation down to 1V VCC. It monitors system supply voltage in portable battery-powered devices and asserts OUT low when VCC falls below threshold, enabling reset or power-fail signaling.

For engineers reviewing the MAX6377UR26+T datasheet, MAX6377UR26+T pinout, MAX6377UR26+T application, or MAX6377UR26+T equivalent, key selection criteria include its 2.63V detection accuracy over -40°C to +85°C, immunity to sub-200µs VCC transients, SOT23-3 package compatibility, and open-drain output requiring external pull-up for interfacing with mixed-voltage logic domains.

Technical Context

The MAX6377UR26+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.63V trip point, eliminating external components. Its open-drain output sinks current only when asserted (VCC < VTH), supporting flexible pull-up to any voltage ≤5.5V.

Designed for single-function voltage monitoring, it guarantees correct output state down to 1V VCC and rejects fast negative-going transients via built-in hysteresis (100mV typical) and propagation delay filtering (20µs typical at 25°C). No enable pin or manual reset is provided - operation is fully autonomous.

Key Specifications

Pinout & Package

MAX6377UR26+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with SC70-3 but with higher power dissipation rating (320mW at +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB26DBZR and APX803S-26SA-7, the MAX6377UR26+T offers optimal balance of precision (±2.5%), ultra-low current (500nA), and open-drain flexibility for mixed-voltage designs - making it preferred for portable consumer and medical applications where layout simplicity and battery longevity are prioritized over automotive qualification or sub-1% threshold tolerance.

Availability

MAX6377UR26+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, industrial sensor nodes, and consumer IoT remotes requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MAX6377UR26+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer markets.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in space-constrained, battery-operated systems - delivering precision reset functionality without external components or calibration.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6377UR26+T?

The MAX6377UR26+T has a nominal threshold voltage of 2.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed at wafer test and confirmed per Table 1 in the datasheet, where suffix "26" corresponds to 2.63V typical at +25°C and 2.564V to 2.696V min/max across temperature.

Does the MAX6377UR26+T require an external pull-up resistor on the OUT pin?

Yes, the MAX6377UR26+T features an open-drain output and requires an external pull-up resistor to establish a defined logic-high level when not asserted. The datasheet specifies that the pull-up may connect to any voltage up to 5.5V, and resistor value must ensure VOL ≤0.4V at ISINK = 100µA while maintaining adequate rise time for the target logic family.

Can the MAX6377UR26+T operate reliably below 1.2V VCC?

No - while the MAX6377UR26+T guarantees correct output logic state down to 1V VCC, its specified operating range begins at 1.2V. Below 1.2V, supply current and propagation delay are not characterized, and bandgap reference stability cannot be assured. For designs requiring operation below 1.2V, consult Maxim's MAX6326 series or similar ultra-low-VCC supervisors.

What is the maximum transient duration the MAX6377UR26+T can ignore at 2.63V threshold overdrive?

At a threshold overdrive of 20mV (i.e., VCC = 2.61V), the MAX6377UR26+T can ignore negative-going transients up to approximately 120µs, as shown in Figure MAX6375-04. This immunity increases with larger overdrive - e.g., at 100mV overdrive (VCC = 2.53V), maximum allowable transient duration exceeds 200µs - ensuring robust operation in noisy power environments.

Is the MAX6377UR26+T pin-compatible with other members of the MAX6375–MAX6380 family in SOT23-3?

Yes - all MAX6375–MAX6380 variants in the UR (SOT23-3) package share identical pinout: Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC. This allows direct substitution between thresholds (e.g., R22 to R31) and output types (e.g., MAX6375URxx+T push-pull vs. MAX6377URxx+T open-drain), though functional behavior (active-high vs. active-low, push-pull vs. open-drain) must be verified in the target circuit.