Analog Devices Inc./Maxim Integrated MAX6463XR33+T

Overview

MAX6463XR33+T from Maxim Integrated is a precision ultra-low-power voltage detector with active-low open-drain output, 3.3V nominal trip threshold (VTH− = 3.300V), ±2.5% threshold accuracy over −40°C to +125°C, 17µs propagation delay, and 1.0µA supply current at 3.6V - used for battery voltage monitoring and power-fail detection in portable medical devices and low-power microcontroller systems.

For engineers reviewing the MAX6463XR33+T datasheet, MAX6463XR33+T pinout, MAX6463XR33+T application, or MAX6463XR33+T equivalent, key selection criteria include open-drain compatibility with mixed-voltage logic, immunity to sub-20µs VCC transients, guaranteed hysteresis (5%), and SC70-3 package suitability for space-constrained PCB layouts.

Technical Context

The MAX6463XR33+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 3.300V (±2.5%) and VTH+ = 3.465V (5% hysteresis). It asserts its open-drain output low when VCC falls below VTH− and releases only after VCC rises above VTH+.

No external components are required: internal hysteresis eliminates oscillation near threshold, and transient immunity ensures reliable operation during short VCC glitches (e.g., ≤15µs at 300mV overdrive). The device operates from 1.2V to 6.0V supply and remains functional down to 0V VCC with external pullup.

Key Specifications

Pinout & Package

MAX6463XR33+T is housed in a 3-pin SC70-3 package (1.25mm × 0.85mm, 0.65mm pitch) with exposed pad option not specified. Pin 1 = OUT (open-drain, active-low), Pin 2 = GND, Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and TPS3808G33DBVR, MAX6463XR33+T delivers optimal trade-off for space- and power-constrained designs: lowest ICC (1.0µA), smallest package (SC70-3), and integrated hysteresis - eliminating design overhead while maintaining ±2.5% accuracy across automotive temperature range.

Availability

MAX6463XR33+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6463XR33+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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications - emphasizing reliability, low power, and high integration.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems, targeting applications where <1µA quiescent current, factory-trimmed thresholds, and transient-immune reset generation are essential.

FAQ

What is the exact threshold voltage and tolerance of MAX6463XR33+T?

The MAX6463XR33+T has a nominal lower trip threshold (VTH−) of 3.300V with ±2.5% tolerance over −40°C to +125°C, as confirmed in Table 1a of the datasheet. Its upper threshold (VTH+) is 3.465V (5% hysteresis), ensuring stable output transition without chatter near the trip point. This specification applies directly to the MAX6463XR33+T variant.

Does MAX6463XR33+T require external components to operate?

No, MAX6463XR33+T requires no external components for basic voltage detection. Its internal bandgap reference, comparator, trimmed resistors, and 5% hysteresis circuit eliminate the need for external resistors or capacitors. Only an external pullup resistor is needed on the open-drain OUT pin to establish a logic-high state - a standard requirement for all open-drain outputs.

What is the maximum VCC transient duration that MAX6463XR33+T can ignore?

According to the Typical Operating Characteristics (Figure MAX6461 toc04), MAX6463XR33+T rejects VCC transients up to ~15µs in duration when the overdrive (VTH− − VCC) is 300mV. At smaller overdrives (e.g., 100mV), it tolerates longer transients (~20µs). This immunity is inherent to the internal architecture and does not require external filtering.

Can MAX6463XR33+T drive a 1.8V logic input directly?

Yes - the open-drain OUT pin of MAX6463XR33+T can interface with 1.8V logic by connecting the external pullup resistor to a 1.8V supply. When asserted, OUT sinks current and pulls down to ≤0.4V (at ISINK = 1mA), satisfying 1.8V logic low requirements. When released, the pullup establishes a valid 1.8V high level - enabling true level-shifting capability.

Is MAX6463XR33+T compatible with reflow soldering processes?

Yes, MAX6463XR33+T is qualified for standard lead-free reflow soldering per JEDEC J-STD-020. Its SC70-3 package supports peak reflow temperatures up to +260°C (10-second duration), and the "+T" suffix explicitly denotes lead-free, RoHS-compliant construction with matte tin finish - verified in Maxim's Package Information documentation.