Analog Devices Inc./Maxim Integrated MAX6461XR29+T

Overview

MAX6461XR29+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 2.90V 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 is used in portable medical devices and cellular phones to ensure reliable power-on reset and brownout detection.

For engineers reviewing the MAX6461XR29+T datasheet, MAX6461XR29+T pinout, MAX6461XR29+T application, or MAX6461XR29+T equivalent, key selection considerations include its SC70-3 package, active-low push-pull output, 2.9V detection threshold with 5% hysteresis, and guaranteed operation across automotive-grade temperature range without external components.

Technical Context

The MAX6461XR29+T implements a precision bandgap reference and comparator architecture with internally trimmed resistor networks to set its 2.90V VTH− threshold. Its internal 5% hysteresis (VTH+ = VTH− × 1.05 ≈ 3.045V) prevents output oscillation during slow-rising or noisy supply transitions.

This device belongs to the MAX6461–MAX6466 family of voltage detectors and µP supervisory circuits; the MAX6461 variant provides only voltage detection with no reset timeout function, distinguishing it from the MAX6464–MAX6466 series which integrate a 150ms minimum reset timeout period.

Key Specifications

Pinout & Package

MAX6461XR29+T is housed in a 3-pin SC70-3 package with exposed pad (not electrically connected). The package is RoHS-compliant and lead-free, with moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB29DBZR and TPS3808G33DBVR, the MAX6461XR29+T delivers tighter threshold accuracy (±2.5% vs. ±3%), guaranteed 5% hysteresis, and smaller SC70-3 footprint-making it optimal for compact, battery-critical designs requiring deterministic undervoltage response without layout or component compromises.

Availability

MAX6461XR29+T is available at Aetrix Electronics and suitable for portable medical devices, cellular phones, and battery-powered instrumentation requiring stable component supply, long-lifecycle support, and lead-free compliance.

Supply support for MAX6461XR29+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, automotive, and communications markets.

The MAX6461XR29+T belongs to Maxim's ultra-low-power supervisory circuit product line, engineered specifically for battery voltage monitoring and reset generation in energy-sensitive portable and medical electronics.

FAQ

What is the exact voltage threshold of the MAX6461XR29+T?

The MAX6461XR29+T has a factory-set lower trip threshold (VTH−) of 2.90V at +25°C, with guaranteed tolerance of ±2.5% across −40°C to +125°C. Its upper threshold (VTH+) is 3.045V (2.90V × 1.05), providing 5% hysteresis to prevent output oscillation near the trip point. This is confirmed in Table 1a of the official datasheet.

Does the MAX6461XR29+T provide a reset timeout function?

No, the MAX6461XR29+T does not include a reset timeout function. As a member of the MAX6461 series, it is a pure voltage detector with immediate output assertion on threshold breach and release only after VCC exceeds VTH+. In contrast, the MAX6464–MAX6466 variants integrate a minimum 150ms reset timeout period. The MAX6461XR29+T is intended for applications requiring instantaneous detection without delay.

What output configuration does the MAX6461XR29+T use?

The MAX6461XR29+T uses an active-low push-pull output stage. When VCC falls below 2.90V, the OUT pin is driven low (≤0.3V at 1mA sink); when VCC rises above 3.045V, OUT is actively driven high (≥0.8×VCC). This eliminates the need for an external pull-up resistor and allows direct interfacing with standard CMOS logic inputs.

Can the MAX6461XR29+T operate down to 1.2V supply?

Yes, the MAX6461XR29+T is fully specified to operate from VCC = 1.2V to 6.0V across −40°C to +125°C. At 1.2V, it maintains functional detection capability, though output drive strength degrades below 1.8V. Its ultra-low 1.0µA supply current at 3.6V makes it especially suited for low-voltage battery monitoring where extended runtime is essential.

Is the MAX6461XR29+T pin-compatible with other members of the MAX6461–MAX6466 family?

The MAX6461XR29+T in SC70-3 package shares identical pinout (OUT-GND-VCC) with all SC70-3 variants in the MAX6461–MAX6466 family, including MAX6462XR29+T and MAX6463XR29+T. However, output behavior differs: MAX6461 is active-low push-pull, MAX6462 is active-high push-pull, and MAX6463 is active-low open-drain. Swapping requires verifying logic polarity and drive requirements.