Analog Devices Inc./Maxim Integrated MAX6461UR29+T

Overview

MAX6461UR29+T from Maxim Integrated is a precision ultra-low-power voltage detector IC designed for battery and power-supply monitoring in space-constrained portable systems. It features a fixed 2.90V 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 operates in SOT23-3 package and asserts active-low output when VCC falls below VTH−.

For engineers reviewing the MAX6461UR29+T datasheet, MAX6461UR29+T pinout, MAX6461UR29+T application, or MAX6461UR29+T equivalent, key selection criteria include threshold accuracy under temperature variation, sub-2µA quiescent current for multi-year battery life, immunity to short transients, hysteresis-enabled noise rejection, and compatibility with 1.6V–5.5V monitored rails in industrial and medical wearables.

Technical Context

The MAX6461UR29+T implements a precision bandgap reference and comparator-based detection architecture with internally trimmed resistor networks to set its factory-trimmed 2.90V (±2.5%) VTH− threshold. Its internal 5% hysteresis ensures VTH+ = VTH− × 1.05 = 3.031V, preventing output chatter during slow-rising or noisy supply conditions.

As a member of the MAX6461–MAX6466 family, it uses BiCMOS process technology (581 transistors) and delivers guaranteed operation across −40°C to +125°C without external components. Unlike supervisory variants (e.g., MAX6464 series), it provides pure voltage detection with no reset timeout - output deasserts immediately upon VCC exceeding VTH+.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm × 1.0mm body, 0.95mm pitch), lead-free, tape-and-reel format.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6461UR29+T, TLV803EB29DBZR offers lower ICC but sacrifices speed and exact trip matching, while TPS3801K29DBVR improves accuracy and delay at the cost of higher power - making MAX6461UR29+T optimal for cost-sensitive, long-life 2.90V brownout detection.

Availability

MAX6461UR29+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, wearable fitness trackers, and automotive telematics units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6461UR29+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, medical, and communications markets.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage supervision in portable and harsh-environment electronics, prioritizing nanoscale current consumption, factory-trimmed precision, and robust transient immunity without external components.

FAQ

What is the exact voltage threshold and hysteresis of MAX6461UR29+T?

The MAX6461UR29+T has a factory-trimmed lower trip threshold (VTH−) of 2.90V with ±2.5% accuracy over −40°C to +125°C. Its internal hysteresis is fixed at 5%, resulting in an upper trip threshold (VTH+) of 3.031V (2.90V × 1.05). This hysteresis prevents output oscillation during supply noise or slow recovery, and is fully specified in Table 1a and 1b of the MAX6461–MAX6466 datasheet.

Does MAX6461UR29+T require external components to operate?

No, MAX6461UR29+T requires no external components. It integrates a precision bandgap reference, comparator, trimmed resistor network, and 5% hysteresis circuit. The single VCC pin serves as both power supply and monitored input, eliminating the need for external voltage dividers, capacitors, or pull-up resistors - a key advantage for miniaturized PCBs in MAX6461UR29+T-based designs.

What is the supply current of MAX6461UR29+T across temperature and voltage?

MAX6461UR29+T draws 1.0µA typical supply current at 3.6V and +25°C, rising to 3.5µA maximum at +125°C and 5.0V. Over the full −40°C to +125°C range and 1.2V–6.0V VCC, ICC remains ≤3.5µA. This ultra-low current enables multi-year operation from coin cells and is confirmed in the Electrical Characteristics table (ICC row) of the MAX6461–MAX6466 datasheet.

How does the output stage of MAX6461UR29+T behave during power-up and brownout?

During power-up, MAX6461UR29+T's active-low push-pull output remains low until VCC exceeds 3.031V (VTH+), then transitions high. During brownout, output asserts low when VCC falls below 2.90V (VTH−) and stays low until VCC rises above 3.031V. Output low voltage is ≤0.4V at 9mA sink (VCC ≥ 4.5V), and output high is ≥0.8×VCC at 8mA source - enabling direct interface with standard logic families without level shifters.

Is MAX6461UR29+T compatible with lead-free assembly processes?

Yes, MAX6461UR29+T is supplied in lead-free packaging, indicated by the "+T" suffix per Maxim's ordering convention. It complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and supports standard Pb-free reflow profiles up to 260°C peak. The device is rated for soldering at 300°C for 10 seconds, and its SOT23-3 package meets RoHS Directive 2011/65/EU requirements - verified in the Package Information section of the MAX6461–MAX6466 datasheet.