Analog Devices Inc./Maxim Integrated MAX6335US18D3

Overview

MAX6335US18D3 from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit designed for 1.8V power supply monitoring in space-constrained embedded systems. It asserts a high-level RESET signal when VCC drops below 1.80V (±2.3% over temperature) or upon manual reset, with guaranteed operation down to 0.7V VCC and a fixed 100ms minimum timeout period. Its ultra-low 3.3µA supply current and 4-pin SOT143 package support battery-powered instrumentation and automotive control modules.

For engineers reviewing the MAX6335US18D3 datasheet, MAX6335US18D3 pinout, MAX6335US18D3 application, or MAX6335US18D3 equivalent, this page delivers verified electrical parameters, thermal behavior across –40°C to +125°C, reset timing accuracy under voltage transients, and validated alternatives for 1.8V µP reset supervision in portable and industrial designs.

Technical Context

The MAX6335US18D3 implements a factory-trimmed bandgap-based reset comparator with ±1.8% initial threshold accuracy at +25°C and ±3% over full temperature range, rejecting fast VCC transients as short as 24µs at 10V/ms slew rate. Its internal debounced manual-reset input (MR) features a 20kΩ pull-up resistor and requires only a 160µs minimum pulse width at 2.6V VCC.

Reset assertion remains active for ≥100ms after VCC rises above 1.80V or MR deasserts, with timeout stability maintained across temperature (±15% normalized variation). The push/pull output drives high to ≥0.8VCC at 200µA load and low to ≤0.3VCC at 500µA, ensuring valid logic levels for CMOS µP reset inputs even during brownout recovery.

Key Specifications

Pinout & Package

MAX6335US18D3 is housed in a 4-pin SOT143 surface-mount package (3.0mm × 1.6mm × 0.9mm), optimized for PCB area-constrained applications including portable instrumentation and automotive ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6335US18D3, MAX6315US18D3-T trades 3× higher supply current and reduced thermal range for legacy design continuity, while TPS3808G18DBVR offers superior ICC efficiency at the cost of active-low interface complexity and longer reset hold time.

Availability

MAX6335US18D3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and portable medical sensors requiring stable component supply with guaranteed long-term availability and lead-free compliance.

Supply support for MAX6335US18D3 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 communications markets.

The MAX6335 series belongs to Maxim's µP supervisory product line, engineered specifically for ultra-low-voltage, low-power reset supervision in battery-operated and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6335US18D3 and how does it vary with temperature?

The MAX6335US18D3 has a factory-trimmed nominal reset threshold of 1.80V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This means the actual threshold falls between 1.75V and 1.85V at room temperature, and between 1.74V and 1.86V across the entire temperature span. The MAX6335US18D3 datasheet confirms this specification in Table 1 and Electrical Characteristics section.

Does MAX6335US18D3 support manual reset functionality, and what are the electrical requirements?

Yes, MAX6335US18D3 includes a debounced manual-reset input (MR) that asserts reset when pulled low. The MR pin features an internal 20kΩ pull-up resistor, so it may be left unconnected if unused. A logic-low pulse of ≥160µs at 2.6V VCC is required to trigger reset, and the MAX6335US18D3 maintains reset assertion for ≥100ms after MR returns high, per its D3 timeout configuration.

What is the supply current consumption of MAX6335US18D3 at 1.8V and how does it scale with temperature?

The MAX6335US18D3 draws 3.3µA typical supply current at 1.8V and +25°C, rising to 6.0µA maximum across –40°C to +125°C. Its ultra-low ICC enables multi-year operation on coin-cell batteries; the MAX6335US18D3 maintains sub-7µA draw even at maximum temperature, as verified in the Electrical Characteristics table and Typical Operating Characteristics graph (ICC vs. Temperature).

Can MAX6335US18D3 operate reliably during severe VCC transients, and what is its immunity specification?

Yes, the MAX6335US18D3 is designed to reject fast negative-going VCC transients: it ignores pulses shorter than 24µs when VCC falls at 10V/ms, as specified in the Electrical Characteristics table. This immunity is achieved through internal comparator hysteresis and filtering, making the MAX6335US18D3 suitable for noisy environments like automotive power systems and industrial motor controls.

What package type and pin compatibility does MAX6335US18D3 offer, and which legacy devices does it replace?

MAX6335US18D3 uses a 4-pin SOT143 package (3.0mm × 1.6mm) and is pin-compatible with MAX811/MAX812 and MAX6314/MAX6315 supervisory circuits. This allows drop-in replacement in existing layouts without PCB modification. The MAX6335US18D3 shares identical pinout (GND, RESET, MR, VCC) and footprint, enabling seamless migration to lower ICC and extended temperature performance.