Analog Devices Inc./Maxim Integrated MAX6306UK30D3

Overview

The MAX6306UK30D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC for undervoltage conditions and provides a push/pull active-low reset output. It features a factory-trimmed 3.0V ±2.5% reset threshold, 140ms (min) reset timeout period, manual-reset input (MR), and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset assertion.

For engineers reviewing the MAX6306UK30D3 datasheet, MAX6306UK30D3 pinout, MAX6306UK30D3 application, or MAX6306UK30D3 equivalent, key selection considerations include its 3.0V VCC reset threshold tolerance, MR input compatibility with TTL/CMOS logic, immunity to fast VCC transients, and operation across 0°C to +70°C industrial temperature range.

Technical Context

The MAX6306UK30D3 uses an internal factory-trimmed resistor divider to monitor VCC against a precision 3.0V threshold, with ±2.5% accuracy over –40°C to +85°C and ±1.5% at +25°C. Its reset generator asserts the push/pull RESET output low for ≥140ms after all monitored supplies exceed threshold, and it includes a dedicated manual-reset input with 63.5kΩ internal pull-up.

This device supports dual-supply monitoring via its RST IN input (1.23V reference threshold) and is immune to negative-going VCC transients up to 100µs at 100mV overdrive - critical for noise-prone portable and industrial environments. It draws only 8µA typical supply current and operates from VCC = (3.0V + 2.5%) to +5.5V.

Key Specifications

Pinout & Package

MAX6306UK30D3 is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts and reflow-compatible assembly. The package is RoHS-compliant and available in both leaded and lead-free variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK30D2-T and TLV809K33DBZR, the MAX6306UK30D3 uniquely combines 3.0V precision supervision, 140ms timeout, manual reset, and auxiliary RST IN in one SOT23-5 package - making it optimal for multivoltage industrial systems requiring field-serviceability and robust transient immunity.

Availability

MAX6306UK30D3 is available at Aetrix Electronics and suitable for industrial control systems, portable medical electronics, automotive body electronics, and network infrastructure equipment requiring stable component supply across extended product lifecycles.

Supply support for MAX6306UK30D3 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 computing markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, noise-sensitive applications - delivering precision reset generation with minimal external components and guaranteed transient immunity.

FAQ

What is the exact factory-programmed reset threshold voltage for MAX6306UK30D3?

The MAX6306UK30D3 has a nominal VCC reset threshold of 3.0V, with ±2.5% tolerance over the full operating temperature range (0°C to +70°C). This value is factory-trimmed using an internal resistor divider and verified per Maxim's production test flow - not user-adjustable. At +25°C, the tolerance tightens to ±1.5%, yielding a typical range of 2.955V to 3.045V.

Does MAX6306UK30D3 support monitoring of voltages other than VCC?

Yes, the MAX6306UK30D3 includes an RST IN pin that compares an external voltage to a precise 1.23V internal reference. By connecting a resistor divider from the target rail (e.g., 12V, 24V) to RST IN and GND, users can configure undervoltage detection for secondary supplies. The MAX6306UK30D3 datasheet provides the formula VTH = ((R1 + R2)/R2) × 1.23V for threshold calculation.

What is the function and electrical behavior of the MR pin on MAX6306UK30D3?

The MR (Manual Reset) pin on MAX6306UK30D3 is an active-low input with an internal 63.5kΩ pull-up resistor. Pulling MR low forces RESET to assert immediately and remain active for the full 140ms timeout after MR returns high. It accepts TTL logic levels in 5V systems and CMOS levels in 3V systems. Driving MR from a separate supply risks ESD structure conduction if VCC drops - so MR should share the same supply as VCC.

How does MAX6306UK30D3 handle short-duration voltage transients on VCC?

The MAX6306UK30D3 is specifically designed to ignore fast VCC transients: it rejects negative-going glitches ≤100µs wide at 100mV overdrive (i.e., VCC dipping 100mV below 3.0V), per its Typical Operating Characteristics graph. This immunity stems from internal filtering and comparator hysteresis (2.5mV on RST IN), preventing spurious resets in electrically noisy environments like motor drives or switching power supplies.

What are the absolute maximum ratings for VCC and other pins on MAX6306UK30D3?

The MAX6306UK30D3 has an absolute maximum VCC rating of –0.3V to +6V. All other pins (RESET, GND, RST IN, MR) tolerate –0.3V to (VCC + 0.3V). Continuous input/output current per pin is limited to 20mA. Exceeding these ratings - especially applying voltage to MR while VCC is absent - may cause permanent damage due to forward-biasing of internal ESD protection diodes.