Analog Devices Inc./Maxim Integrated MAX6461XR25+T

Overview

MAX6461XR25+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 2.5V 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 MAX6461XR25+T datasheet, MAX6461XR25+T pinout, MAX6461XR25+T application, or MAX6461XR25+T equivalent, key selection criteria include its SC70-3 package, active-low push-pull output, 5% internal hysteresis, and guaranteed operation down to 1.2V VCC - critical for Li⁺ battery-powered designs with tight voltage margins.

Technical Context

The MAX6461XR25+T implements a precision bandgap reference and comparator architecture with internally trimmed resistor networks to set its 2.500V nominal VTH− threshold (min 2.438V, max 2.563V over temperature). Its hysteresis is fixed at 5% (VTH+ = VTH− × 1.05), eliminating external components while preventing output chatter near threshold.

It operates as a pure voltage detector (not a supervisory circuit with timeout), asserting its active-low push-pull output when VCC falls below VTH− and releasing only after VCC rises above VTH+. No external capacitor or timing network is required, and it remains functional with VCC as low as 1.2V.

Key Specifications

Pinout & Package

MAX6461XR25+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for ultra-compact PCB layouts in portable electronics. Pin 1 is OUT, Pin 2 is GND, and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB25DBVR and TPS3801K25DBVR, MAX6461XR25+T delivers optimal balance of ultra-low ICC, integrated 5% hysteresis, and push-pull drive - eliminating design compromises in battery-critical, size-constrained applications where timing predictability and component count matter most.

Availability

MAX6461XR25+T is available at Aetrix Electronics and suitable for portable medical devices, cellular phones, and load-switching circuits requiring stable component supply with lead-free compliance and extended temperature support.

Supply support for MAX6461XR25+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 consumer applications.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power voltage monitoring in battery-operated equipment, delivering precision thresholds, minimal ICC, and robust transient immunity in miniature packages.

FAQ

What is the exact voltage threshold of MAX6461XR25+T?

The MAX6461XR25+T has a nominal lower trip threshold (VTH−) of 2.500V at +25°C, with guaranteed limits of 2.438V (min) and 2.563V (max) across −40°C to +125°C. Its upper threshold (VTH+) is 2.625V (typ), calculated as VTH− × 1.05, enabling stable hysteresis without external components. This threshold is factory-trimmed and does not require user calibration.

Does MAX6461XR25+T provide a reset timeout period?

No, MAX6461XR25+T is a voltage detector, not a supervisory circuit with timeout. It asserts its active-low output immediately when VCC falls below VTH− and releases it only when VCC rises above VTH+. Unlike the MAX6464–MAX6466 variants, MAX6461XR25+T has no built-in reset timeout - its behavior is purely threshold-based with 5% hysteresis.

What package and pinout does MAX6461XR25+T use?

MAX6461XR25+T uses the SC70-3 package (2.0mm × 2.1mm × 0.95mm) with pin 1 = OUT (active-low push-pull), pin 2 = GND, and pin 3 = VCC. This 3-pin configuration integrates supply, sense, and output in minimal footprint - confirmed by Maxim's ordering information and pin configuration diagrams for XR-series variants.

Can MAX6461XR25+T operate with VCC below 1.6V?

Yes, MAX6461XR25+T is fully specified down to 1.2V VCC per its Absolute Maximum Ratings and Electrical Characteristics table. While its 2.5V threshold implies typical use above that level, the device remains functional and draws only ~1.3µA at 1.2V - enabling detection of deep brownout conditions in Li⁺ battery systems nearing end-of-life.

How does MAX6461XR25+T handle voltage transients?

MAX6461XR25+T is immune to short VCC transients: it ignores falling glitches ≤15µs wide when overdriven by 100mV below VTH−, as shown in the Typical Operating Characteristics graph (toc04). This inherent noise rejection eliminates need for external filtering and improves reliability in electrically noisy environments such as motor-driven portable tools.