Analog Devices Inc./Maxim Integrated MAX6377UR26+

Overview

MAX6377UR26+ from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 2.63V threshold (±2.5% over temperature), 500nA supply current, and operates from 1.2V to 5.5V VCC. Used in portable equipment for reset assertion during brownout conditions.

For engineers reviewing the MAX6377UR26+ datasheet, MAX6377UR26+ pinout, MAX6377UR26+ application, or MAX6377UR26+ equivalent, key selection criteria include its 2.63V trip point, open-drain output architecture, SC70/SOT23-3 package compatibility, transient immunity up to 200µs at 100mV overdrive, and guaranteed logic state down to 1V VCC.

Technical Context

The MAX6377UR26+ implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.63V detection threshold. Its open-drain output requires an external pull-up and asserts low when VCC falls below VTH, remaining valid down to 1V supply.

It delivers 500nA typical supply current and ±2.5% threshold accuracy across –40°C to +85°C. Propagation delay is 6.3µs (falling edge) and it rejects transients ≤200µs at 100mV overdrive, ensuring robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6377UR26+ is packaged in a 3-pin SOT23-3 (lead-free, marked "FZHC") with standard pinout: Pin 1 = GND, Pin 2 = OUT (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC26DBZR and APX803S-26SA-7, the MAX6377UR26+ uniquely balances ultra-low 500nA current, open-drain flexibility, and industrial-grade temperature stability - making it optimal for long-life portable electronics where both power and interface adaptability matter.

Availability

MAX6377UR26+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial telemetry nodes, wearables with low-power MCU, and smart meter backup power monitoring requiring stable component supply and long-term manufacturability.

Supply support for MAX6377UR26+ 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 power, sensing, and connectivity in demanding industrial, medical, and communications applications.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems - delivering factory-trimmed thresholds, nanoscale supply current, and transient-hardened operation in minimal 3-pin packages.

FAQ

What is the exact reset threshold voltage of the MAX6377UR26+?

The MAX6377UR26+ has a factory-trimmed nominal reset threshold of 2.63V, with ±2.5% accuracy over the full –40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix "R26", and applies specifically to the MAX6377UR26+ variant - not the broader MAX6377 family.

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

Yes, the MAX6377UR26+ features an open-drain output and requires an external pull-up resistor to establish a defined high logic level. The datasheet specifies that the pull-up may connect to any supply up to 5.5V, and recommends selecting a resistor value that ensures VOL ≤0.4V at ISINK = 100µA while meeting system rise-time requirements.

What is the minimum VCC voltage at which the MAX6377UR26+ guarantees correct output logic state?

The MAX6377UR26+ guarantees correct output logic state - i.e., OUT remains high when VCC ≥ VTH and asserts low when VCC < VTH - down to 1V VCC. This is explicitly stated in the General Description and verified across the full temperature range, enabling reliable operation during deep battery discharge.

Can the MAX6377UR26+ be used in place of the MAX6375UR26+?

No - the MAX6377UR26+ and MAX6375UR26+ differ in output configuration: MAX6377UR26+ has open-drain output, while MAX6375UR26+ has push-pull. They share the same 2.63V threshold and pinout, but substituting one for the other requires verifying whether the target system expects active-low open-drain (requires pull-up) or active-low push-pull (no pull-up needed).

What package type and marking code does the MAX6377UR26+ use?

The MAX6377UR26+ is supplied in a lead-free 3-pin SOT23-3 package with top-marking code "FZHC". This marking is confirmed in Table 2 of the datasheet under "MAX6377_R26-T" (leaded) and "MAX6377UR26+" (lead-free), and matches the SOT23-3 outline drawing (21-0051).