Analog Devices Inc./Maxim Integrated MAX6409BS40+T

Overview

MAX6409BS40+T from Maxim Integrated is an ultra-low-power voltage detector IC designed for battery and power-supply monitoring in portable systems. It features a factory-trimmed 4.00V threshold (±2.5% over -40°C to +85°C), active-low push-pull output, 500nA supply current at 3V, manual reset input with internal 50kΩ pullup, and guaranteed valid output down to VCC = 1.0V. It is used to assert system reset when main supply drops below safe operating voltage.

For engineers reviewing the MAX6409BS40+T datasheet, MAX6409BS40+T pinout, MAX6409BS40+T application, or MAX6409BS40+T equivalent, key selection criteria include precise 4.0V detection accuracy, sub-µA quiescent current, UCSP-4 package footprint, immunity to short VCC transients, and compatibility with 1.0–5.5V supply rails in space-constrained battery-powered designs.

Technical Context

The MAX6409BS40+T implements a precision bandgap reference comparator with hysteresis of 9.5mV and temperature coefficient of 40ppm/°C, enabling stable threshold detection across industrial temperature range. Its push-pull output drives logic directly without external pullup, while the manual reset (MR) input supports TTL/CMOS-compatible triggering with 1µs minimum pulse width and 100ns glitch rejection.

Designed for single-supply operation from 1.2V to 5.5V, the device asserts OUT low when VCC falls below 4.00V and maintains valid logic state down to 1.0V. Propagation delay is 42µs (VCC falling) and 100µs (VCC rising), with startup time of 88µs from power-on to first valid output.

Key Specifications

Pinout & Package

MAX6409BS40+T is housed in a 4-bump, 2mm × 2mm chip-scale package (UCSP-4) with bottom-mounted solder bumps. The package offers 70% smaller footprint than SC70 and is optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and APX803S-40SA-7, the MAX6409BS40+T delivers superior battery longevity via 500nA IQ, guaranteed operation down to 1.0V, and integrated manual reset-making it optimal for compact, long-life portable systems where every nanoamp and millivolt matters.

Availability

MAX6409BS40+T is available at Aetrix Electronics and suitable for smartphone power sequencing, wearable health monitors, Bluetooth headsets, industrial sensor nodes, and other applications requiring stable component supply with tight voltage tolerance and minimal power consumption.

Supply support for MAX6409BS40+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6406–MAX6411 family was engineered specifically for ultra-low-power voltage monitoring in space-constrained portable electronics, emphasizing sub-µA quiescent current, factory-trimmed accuracy, and chip-scale packaging without external components.

FAQ

What is the exact reset threshold voltage of the MAX6409BS40+T?

The MAX6409BS40+T has a factory-trimmed nominal reset threshold of 4.00V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +85°C. At +25°C, the typical threshold is 4.00V, with min/max limits of 3.900V and 4.100V respectively per Table 1 in the datasheet. This precision eliminates need for external calibration or trimming resistors in the MAX6409BS40+T design.

Does the MAX6409BS40+T require external components to operate?

No, the MAX6409BS40+T requires no external components for basic operation: only VCC, GND, and optionally MR (if manual reset is used). Its internal 50kΩ MR pullup resistor and push-pull output eliminate need for external pullups or level-shifting circuitry. This integration reduces BOM count, PCB area, and assembly cost-key advantages confirmed in the MAX6409BS40+T datasheet's Features and Applications sections.

What is the supply current of the MAX6409BS40+T at different voltages and temperatures?

The MAX6409BS40+T draws 500nA typical supply current at VCC = 3V and +25°C. Over temperature, supply current remains below 1.0µA from -40°C to +85°C per Electrical Characteristics table. At VCC = 5.5V, ICC is 1.0–1.75µA. These ultra-low values are measured and specified for the MAX6409BS40+T variant and enable multi-year battery life in always-on monitoring applications.

Can the MAX6409BS40+T operate reliably when VCC drops below 2.0V?

Yes-the MAX6409BS40+T guarantees correct output logic state down to VCC = 1.0V, as explicitly stated in the General Description and Electrical Characteristics sections. This ensures deterministic reset assertion even during deep brownout events where competing detectors may become undefined. The MAX6409BS40+T maintains valid active-low output behavior throughout its entire 1.2V–5.5V operating range.

What package type and dimensions does the MAX6409BS40+T use?

The MAX6409BS40+T uses a 4-bump, 2mm × 2mm chip-scale package (UCSP-4) with bottom-mounted solder bumps. Per Package Information and Pin Configuration diagrams, it measures 45 mil × 45 mil (1.14mm × 1.14mm) with 0.5mm bump pitch. This package is 70% smaller than SC70 and is optimized for high-density portable PCB layouts in the MAX6409BS40+T application space.