Analog Devices Inc./Maxim Integrated MAX6463UK43+T

Overview

MAX6463UK43+T from Maxim Integrated is a precision ultra-low-power voltage detector with active-low open-drain output, 4.3V lower trip threshold (VTH− = 4.236V typ), ±2.5% threshold accuracy over −40°C to +125°C, and 17µs propagation delay. It monitors system supply voltage in battery-powered portable medical devices and cellular phones where reliable power-fail detection without external components is critical.

For engineers reviewing the MAX6463UK43+T datasheet, MAX6463UK43+T pinout, MAX6463UK43+T application, or MAX6463UK43+T equivalent, key selection criteria include its 1.0µA supply current at 3.6V, internal 5% hysteresis (VTH+ = VTH− × 1.05), SC70/SOT23 package compatibility, and immunity to short voltage transients up to 20µs at 100mV overdrive.

Technical Context

The MAX6463UK43+T implements a precision bandgap reference and comparator-based detection architecture with internally trimmed resistor networks that fix the 4.3V trip point. Its hysteresis circuit ensures stable output assertion by defining distinct rising (VTH+ = 4.426V typ) and falling (VTH− = 4.236V typ) thresholds.

This device belongs to the MAX6461–MAX6466 family of voltage detectors (not supervisory circuits with timeout), so it lacks reset timeout functionality. Its open-drain output requires an external pullup and supports logic-level interfacing independent of VCC-enabling use with 0V to 6V pullup supplies.

Key Specifications

Pinout & Package

MAX6463UK43+T is packaged in a 5-pin SOT23-5 (lead-free, RoHS-compliant) with pins 1–5 assigned as OUT, GND, VCC, N.C., and GND respectively. Both ground pins must be connected to system ground for proper operation and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC43DBZR and TPS3808G33DBVR, the MAX6463UK43+T delivers integrated 5% hysteresis and exact 4.3V detection in a compact 5-pin SOT23 without external components-making it optimal for space-constrained, high-reliability 4.3V supply monitoring where reset timing is immediate and deterministic.

Availability

MAX6463UK43+T is available at Aetrix Electronics and suitable for portable medical devices, cellular phone power management, industrial handheld scanners, and wearable health trackers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6463UK43+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, sensing, and interface applications, with emphasis on low-power, high-reliability solutions for demanding environments.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems-delivering factory-trimmed thresholds, integrated hysteresis, and sub-µA operation without external components.

FAQ

What is the exact voltage threshold of MAX6463UK43+T and how does it vary with temperature?

The MAX6463UK43+T has a nominal lower trip threshold (VTH−) of 4.236V at +25°C, with guaranteed range of 4.193V to 4.408V over −40°C to +125°C. This ±2.5% accuracy is maintained across the full operating temperature range, as confirmed in Table 1a of the official datasheet. The upper threshold (VTH+) is fixed at VTH− × 1.05, yielding 4.426V typ at +25°C.

Does MAX6463UK43+T provide a reset timeout period like some supervisory circuits?

No, MAX6463UK43+T does not include a reset timeout period. It is a voltage detector (not a µP supervisory circuit), so its output asserts immediately when VCC falls below VTH− and de-asserts immediately when VCC rises above VTH+. The MAX6464–MAX6466 variants provide 150ms minimum timeout; MAX6463UK43+T is strictly threshold-detection-only.

What is the purpose of the N.C. pin (Pin 4) on the MAX6463UK43+T SOT23-5 package?

Pin 4 of the MAX6463UK43+T is designated N.C. (No Connection) and must remain unconnected. It has no internal bond or electrical function. Leaving it floating or connecting it to any net may compromise device reliability or violate layout guidelines specified in the Maxim package documentation.

Can MAX6463UK43+T drive a 1.8V logic input directly using its open-drain output?

Yes, MAX6463UK43+T's open-drain output can interface directly with 1.8V logic inputs. Connect an external pullup resistor from OUT (Pin 1) to the 1.8V supply. When asserted, OUT sinks current with VOL ≤ 0.4V at ISINK = 9mA (VCC ≥ 4.5V), ensuring valid logic-low; when de-asserted, leakage is ≤100nA, allowing clean logic-high via pullup.

Is MAX6463UK43+T compatible with lead-free reflow processes?

Yes, MAX6463UK43+T is lead-free and RoHS-compliant, qualified for standard Pb-free reflow profiles including JEDEC J-STD-020D. The "+T" suffix explicitly denotes lead-free tape-and-reel packaging, and the device withstands peak reflow temperatures up to +260°C for 30 seconds as specified in Maxim's package information.