Analog Devices Inc./Maxim Integrated MAX6377UR27+T

Overview

MAX6377UR27+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.700V ±2.5% over -40°C to +85°C, 500nA supply current, and SOT23-3 package - used for precision battery monitoring and power-supply supervision in portable equipment.

For engineers reviewing the MAX6377UR27+T datasheet, MAX6377UR27+T pinout, MAX6377UR27+T application, or MAX6377UR27+T equivalent, this page delivers verified electrical parameters, terminal roles, real-world use cases, and validated alternative options for low-voltage reset supervision in space-constrained, battery-powered systems.

Technical Context

The MAX6377UR27+T integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 2.700V detection without external components. It asserts an active-low, open-drain output (OUT) when VCC falls below VTH, maintaining valid logic state down to 1V supply.

Designed for immunity to fast transients, it rejects negative-going VCC glitches up to 200µs at 10mV overdrive and features ±2.5% threshold accuracy across temperature, 20µs propagation delay (falling edge), and hysteresis of 100mV - all optimized for reliable reset generation in low-noise, low-power embedded systems.

Key Specifications

Pinout & Package

MAX6377UR27+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with gull-wing leads, 1.3mm pitch, and 2.9mm × 1.6mm footprint - optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6377UR27+T, TLV803EB27DBZR offers lower supply current but lacks open-drain compatibility, while APX803S-27SA-7 retains open-drain functionality but sacrifices 1.0% threshold accuracy - making MAX6377UR27+T optimal for precision, low-power, multi-drop reset architectures.

Availability

MAX6377UR27+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and wearable fitness trackers requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6377UR27+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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications - with emphasis on reliability, integration, and ultra-low-power performance.

The MAX6375–MAX6380 family was engineered specifically for battery-powered and energy-harvesting systems needing dependable, zero-calibration voltage supervision with nanoscale quiescent current.

FAQ

What is the exact reset threshold voltage of MAX6377UR27+T and how tightly is it specified?

The MAX6377UR27+T has a factory-trimmed nominal reset threshold of 2.700V, guaranteed within ±2.5% over the full –40°C to +85°C operating temperature range. At +25°C, the typical threshold is 2.700V with ±1.5% room-temperature variance, as confirmed in Table 1 of the official datasheet. This precision eliminates need for external trimming or calibration in production.

Does MAX6377UR27+T require an external pull-up resistor on its OUT pin, and why?

Yes, MAX6377UR27+T requires an external pull-up resistor on its OUT pin because it features an open-drain output configuration. The internal transistor can only sink current (pull low); it cannot actively drive high. A pull-up resistor to a logic-compatible voltage (≤5.5V) establishes the high-state level and ensures proper signal integrity when interfacing with microcontrollers or other logic inputs.

What is the minimum supply voltage at which MAX6377UR27+T guarantees correct output logic state?

MAX6377UR27+T guarantees correct output logic state - i.e., OUT remains high when VCC ≥ VTH and transitions low when VCC falls below VTH - down to 1.0V supply voltage. This is explicitly stated in the General Description and confirmed in the Absolute Maximum Ratings section, enabling reliable reset assertion even during deep battery discharge or ultra-low-power sleep modes.

How does MAX6377UR27+T handle short voltage transients on the VCC line?

MAX6377UR27+T incorporates built-in transient immunity: it ignores negative-going VCC glitches shorter than ~200µs at 10mV overdrive (VTH – VCC), as shown in Figure MAX6375-04. This prevents false resets caused by switching noise or load transients, ensuring robust operation in electrically noisy environments such as motor-driven or RF-integrated portable systems.

Is MAX6377UR27+T available in both leaded and lead-free packaging, and how is lead-free denoted?

Yes, MAX6377UR27+T is available in both leaded and lead-free packaging. Lead-free versions are explicitly denoted by the "+T" suffix in the part number - as in MAX6377UR27+T - whereas the standard "-T" suffix indicates leaded packaging. This distinction is defined in the Ordering Information section and applies to both SOT23-3 and SC70-3 variants.