Analog Devices Inc./Maxim Integrated MAX6412UK46

Overview

MAX6412UK46 from Maxim Integrated is a low-power, single-voltage microprocessor reset supervisor IC with factory-trimmed 4.625V VCC reset threshold, active-low push-pull RESET output, manual reset input (MR), and capacitor-adjustable reset timeout delay. It monitors VCC from 1.6V to 5V, asserts reset below threshold or on MR assertion, and holds reset for programmable duration after recovery - used in automotive ECUs and battery-powered controllers requiring precise brownout protection.

For engineers reviewing the MAX6412UK46 datasheet, MAX6412UK46 pinout, MAX6412UK46 application, or MAX6412UK46 equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, 1.7µA typical quiescent current, SOT23-5 package compatibility, and capacitor-based timeout tuning for µP boot sequencing across -40°C to +125°C industrial/automotive environments.

Technical Context

The MAX6412UK46 implements a precision bandgap-based voltage comparator for VCC monitoring with ±1.25% threshold accuracy at +25°C and ±2.5% over temperature, paired with an internal 240nA current source charging an external capacitor on SRT to generate a programmable reset timeout (tRP = 2.71×10⁶ × CSRT + 275µs). Its MR input features a 20kΩ internal pullup and 1µs minimum pulse width support.

Reset assertion occurs when VCC falls below 4.625V (typ) or MR is pulled low; deassertion requires both VCC > 4.625V and MR high for the full timeout period. The active-low push-pull RESET output delivers VOL ≤ 0.4V at ISINK = 3.2mA (VCC ≥ 4.5V) and VOH ≥ 0.8×VCC at ISOURCE = 800µA, ensuring robust interface with CMOS µP reset inputs.

Key Specifications

Pinout & Package

SOT23-5 package: ultra-compact 2.9mm × 1.6mm footprint with 0.95mm pitch, optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6412UK46, MAX6316LUK46D3+ offers lower cost but omits manual reset, while TPS3808G33DBVR provides lower quiescent current at the expense of threshold mismatch and non-pin-compatible packaging - making MAX6412UK46 optimal for 5V-system brownout protection with MR and push-pull drive in minimal footprint.

Availability

MAX6412UK46 is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6412UK46 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 analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX6412–MAX6420 family was designed specifically for low-power, high-accuracy microprocessor reset supervision in harsh environments - emphasizing precision voltage thresholds, capacitor-programmable timing, and extended temperature operation.

FAQ

What is the exact factory-trimmed reset threshold voltage for MAX6412UK46?

The MAX6412UK46 has a nominal VCC reset threshold of 4.625V, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value corresponds to suffix "46" in Table 1 of the datasheet and is laser-trimmed during manufacturing to eliminate external resistor networks.

How do I calculate the external capacitor value for a desired reset timeout on MAX6412UK46?

Use the formula CSRT = (tRP − 275µs) / 2.71×10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 50ms timeout requires CSRT ≈ 18.4nF. Ceramic capacitors with <10nA leakage are recommended, and SRT trace routing must minimize stray capacitance per layout guidelines.

Does MAX6412UK46 support manual reset functionality, and how is it implemented?

Yes, MAX6412UK46 includes a dedicated MR (manual reset) input (Pin 3) with an internal 20kΩ pullup resistor. Asserting MR low initiates reset; the RESET output remains active for the full capacitor-programmed timeout after MR returns high. No external components are needed - simply connect a momentary switch between MR and GND.

What is the minimum VCC level at which MAX6412UK46 guarantees valid RESET output logic?

MAX6412UK46 guarantees valid RESET output down to VCC = 1V. Below this level, output drive capability degrades significantly. For applications requiring defined logic down to 0V, a 100kΩ pulldown resistor from RESET to GND is recommended - as documented in Figure 6 of the datasheet for MAX6412-series devices.

Is MAX6412UK46 compatible with lead-free soldering processes?

Yes, MAX6412UK46 is available in lead-free packaging. When ordering, replace the standard "-T" suffix with "+T" (e.g., MAX6412UK46+T) to specify RoHS-compliant, lead-free construction. The device supports reflow soldering up to +260°C for lead-free processes, per the Absolute Maximum Ratings table.