Analog Devices Inc./Maxim Integrated MAX6461UR22+T

Overview

The MAX6461UR22+T from Maxim Integrated is a precision ultra-low-power voltage detector IC designed for battery and power-supply monitoring in space-constrained, low-current systems. It features a factory-set 2.20V lower trip threshold (VTH−), ±2.5% threshold accuracy over −40°C to +125°C, 1.0µA supply current at 3.6V, and 17µs propagation delay. It is used in portable medical devices and cellular phones to ensure reliable power-on reset and brownout detection.

For engineers reviewing the MAX6461UR22+T datasheet, MAX6461UR22+T pinout, MAX6461UR22+T application, or MAX6461UR22+T equivalent, key selection considerations include its SOT23-3 package, active-low push-pull output, 2.2V detection threshold with 5% hysteresis, and guaranteed operation across automotive-grade temperature range without external components.

Technical Context

This device implements a precision bandgap reference and comparator-based detection architecture with internally trimmed resistor networks to set fixed VTH− = 2.20V and VTH+ = 2.31V (2.20V × 1.05). Its internal 5% hysteresis prevents output chatter during slow-rising or noisy supply transitions.

As a member of the MAX6461–MAX6466 family, the MAX6461UR22+T belongs specifically to the voltage detector subgroup (not µP supervisory), meaning it provides immediate output assertion on undervoltage without built-in timeout delay-unlike the MAX6464–MAX6466 series which guarantee ≥150ms reset pulse width.

Key Specifications

Pinout & Package

MAX6461UR22+T is housed in a 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 TLV803EB22DBZR and TPS3801K22DBVR, the MAX6461UR22+T uniquely balances ultra-low 1.0µA current, tight ±2.5% threshold accuracy, and robust push-pull output drive - making it optimal for battery-critical, space-constrained designs requiring deterministic reset behavior without layout compromises.

Availability

MAX6461UR22+T is available at Aetrix Electronics and suitable for portable medical devices, cellular phones, and battery-powered instrumentation requiring stable component supply with lead-free compliance and extended temperature support.

Supply support for MAX6461UR22+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, automotive, and communications markets.

The MAX6461UR22+T belongs to Maxim's ultra-low-power supervisory circuit product line, engineered specifically for energy-sensitive applications where long battery life, small size, and guaranteed reset reliability across extreme temperatures are mandatory design requirements.

FAQ

What is the exact voltage threshold and hysteresis of the MAX6461UR22+T?

The MAX6461UR22+T has a factory-set lower trip threshold (VTH−) of 2.20V with ±2.5% accuracy over −40°C to +125°C. Its upper trip threshold (VTH+) is 2.31V (2.20V × 1.05), yielding a fixed 5% hysteresis. These values are confirmed in Table 1a and 1b of the official datasheet and apply specifically to the "22" suffix variant.

Does the MAX6461UR22+T provide a reset timeout delay?

No, the MAX6461UR22+T does not include a built-in reset timeout period. As a MAX6461-series voltage detector, its output asserts immediately when VCC falls below 2.20V and de-asserts only after VCC rises above 2.31V. For guaranteed minimum reset pulse width, consider the MAX6464UR22+T (150ms timeout) instead.

What is the output configuration of the MAX6461UR22+T?

The MAX6461UR22+T features a push-pull, active-low output stage. When asserted, OUT sinks current to GND; when de-asserted, OUT drives high to VCC. This eliminates the need for an external pull-up resistor and allows direct interfacing with standard CMOS inputs, unlike open-drain variants such as the MAX6463UR22+T.

Can the MAX6461UR22+T operate down to 1.2V supply?

Yes, the MAX6461UR22+T is fully specified to operate from VCC = 1.2V to 6.0V. Its 1.0µA supply current and functional performance-including threshold accuracy and propagation delay-are guaranteed across this full range per the Electrical Characteristics table, enabling use with partially discharged batteries or low-voltage rails.

Is the MAX6461UR22+T compatible with lead-free reflow processes?

Yes, the "+T" suffix in MAX6461UR22+T explicitly denotes lead-free packaging compliant with RoHS and JEDEC J-STD-020 reflow profiles. The device supports peak reflow temperatures up to +260°C and is qualified for standard Pb-free soldering processes without derating or special handling.