Analog Devices Inc./Maxim Integrated MAX6841DUKD3+T

Overview

MAX6841DUKD3+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit designed to monitor +0.75V to +1.8V power supplies in portable and battery-powered digital systems. It provides factory-trimmed 0.788V reset threshold, 210ms reset timeout (typ), ±2.5% threshold accuracy over temperature, active-low push-pull RESET output, and debounced manual reset input - enabling reliable power-on reset and brownout protection for critical µP applications.

For engineers reviewing the MAX6841DUKD3+T datasheet, MAX6841DUKD3+T pinout, MAX6841DUKD3+T application, or MAX6841DUKD3+T equivalent, key selection considerations include its SOT23-5 package, guaranteed reset validity down to VCC = 0.55V, immunity to sub-150ns VCC transients, and compatibility with 0.9V–1.5V core supply monitoring in space-constrained embedded designs.

Technical Context

The MAX6841DUKD3+T implements a precision voltage comparator with hysteresis (0.75% of VTH) and a fixed-delay timer to assert reset during VCC undervoltage or MR activation. Its internal reference is trimmed at wafer level for 0.788V threshold, eliminating external resistor networks required by adjustable variants like MAX6843/MAX6844.

It features a debounced MR input with 20kΩ internal pullup, 1µs minimum pulse width requirement, and 150ns glitch rejection. The active-low push-pull RESET output sinks up to 80µA at VCC ≥ 0.83V while maintaining VOL ≤ 0.2×VCC, ensuring clean logic-level signaling to µP reset inputs without external components.

Key Specifications

Pinout & Package

MAX6841DUKD3+T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts in portable equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6841DUKD3+T, MAX6316HUT47+T supports deeper undervoltage detection but lacks manual reset; TPS3106K33DBVR offers industry-standard 3.3V threshold but consumes >2× more current and cannot supervise sub-1V cores.

Availability

MAX6841DUKD3+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, and industrial edge controllers requiring stable component supply with lead-free compliance and tape-and-reel packaging.

Supply support for MAX6841DUKD3+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, communications, and consumer applications.

The MAX6841–MAX6845 family was engineered specifically for ultra-low-voltage microprocessor supervision in portable and energy-constrained systems, addressing the need for sub-1V reset accuracy without external components.

FAQ

What is the exact reset threshold voltage of the MAX6841DUKD3+T?

The MAX6841DUKD3+T has a factory-trimmed reset threshold of 0.788V (±2.5% over -40°C to +85°C), corresponding to the 'D' suffix in its part number. This value is laser-trimmed at wafer test and does not require external calibration. The threshold remains stable across temperature and load, making it suitable for monitoring 0.8V–0.9V core supplies in modern low-power µPs and SoCs. The MAX6841DUKD3+T guarantees this specification under all operating conditions defined in its datasheet.

Does the MAX6841DUKD3+T support manual reset functionality?

Yes, the MAX6841DUKD3+T includes a dedicated MR (manual reset) pin (Pin 4) with an internal 20kΩ pullup resistor to VCC. Pulling MR low forces an immediate reset assertion, which remains active for the full 210ms timeout period after MR returns high. This feature enables hardware-based recovery for firmware hangs or field service operations. No external components are needed, and the input rejects glitches shorter than 150ns, ensuring robust operation in noisy environments. The MAX6841DUKD3+T integrates this function without compromising quiescent current or package size.

What is the purpose of the dual RESET outputs on the MAX6841DUKD3+T?

The MAX6841DUKD3+T provides two complementary reset outputs: Pin 1 (active-low RESET) and Pin 3 (active-high RESET). This allows simultaneous control of both active-low and active-high reset domains - for example, driving a µP's active-low reset pin while also enabling an active-high watchdog enable signal or LED indicator. The outputs are internally synchronized and share the same 210ms timeout, eliminating timing skew between related system functions. This dual-output architecture is unique to the MAX6841 variant and is not available on MAX6842–MAX6845. The MAX6841DUKD3+T delivers this capability in the same compact SOT23-5 footprint.

Can the MAX6841DUKD3+T operate reliably at VCC = 0.75V?

Yes, the MAX6841DUKD3+T is fully specified to operate with VCC as low as 0.75V, and its reset comparator remains functional down to 0.55V. At 0.75V, the device draws only 5.7µA (typ), maintains ±2.5% threshold accuracy, and asserts reset correctly when VCC falls below 0.788V. The push-pull RESET output remains valid with VOL ≤ 0.2×VCC, ensuring clean logic transitions even near the lower limit. This makes the MAX6841DUKD3+T suitable for systems powered by aging batteries or low-dropout regulators with tight headroom. Operation below 0.75V is not guaranteed per datasheet limits.

Is the MAX6841DUKD3+T RoHS-compliant and available in lead-free packaging?

Yes, the MAX6841DUKD3+T is RoHS-compliant and supplied in lead-free packaging, as indicated by the '+T' suffix in its orderable part number. Maxim Integrated certifies this variant for use in environmentally regulated markets including EU, China, and Japan. The device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for reflow soldering per IPC/JEDEC J-STD-020. Tape-and-reel packaging is standard, and Aetrix Electronics provides full traceability documentation for compliance verification. The MAX6841DUKD3+T shares identical electrical performance with its leaded '-T' counterpart.