Analog Devices Inc./Maxim Integrated MAX6306UK30D2

Overview

The MAX6306UK30D2 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC supply voltage and provides a manual-reset input to assert system reset when VCC falls below 3.0V (±2.5% over temperature) or when MR is pulled low. It features a factory-programmed 20ms minimum reset timeout, guaranteed RESET assertion down to VCC = 1V, and immunity to fast VCC transients. It is used in portable computers and multivoltage embedded systems for reliable power-on and brownout reset control.

For engineers reviewing the MAX6306UK30D2 datasheet, MAX6306UK30D2 pinout, MAX6306UK30D2 application, or MAX6306UK30D2 equivalent, this page delivers verified specifications, real-world timing behavior, thermal stability data, manual-reset interface details, and direct alternative part comparisons - all grounded in the official MAX6305–MAX6313 family datasheet (Rev 6, 7/12).

Technical Context

The MAX6306UK30D2 implements a factory-trimmed internal voltage divider to monitor VCC against a precise 3.0V threshold, with ±2.5% tolerance across –40°C to +85°C. Its reset generator includes a temperature-stable RC timer delivering a guaranteed minimum 20ms timeout after VCC recovery or MR release.

It integrates a manual-reset input (MR) with internal 63.5kΩ pull-up, TTL/CMOS-compatible logic thresholds, and 1.5µs minimum pulse width guarantee. The active-low open-drain RESET output remains valid down to VCC = 1V and rejects negative-going transients up to 100V/µs slew rate.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (U5+1), 2.9mm × 1.6mm footprint, RoHS-compliant lead-free option available (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK30D3 and TPS3808G30DBVR, the MAX6306UK30D2 uniquely balances low quiescent current (8µA), integrated manual reset, adjustable secondary input (RST IN), and industry-standard 20ms timeout - making it optimal for cost-sensitive, multi-rail portable designs requiring robust transient immunity.

Availability

MAX6306UK30D2 is available at Aetrix Electronics and suitable for portable computers, industrial controllers, and intelligent instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6306UK30D2 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 management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision - delivering factory-programmable thresholds, manual reset, and transient-immune reset generation in ultra-small SOT23 packages.

FAQ

What is the exact reset threshold voltage for MAX6306UK30D2 and how stable is it over temperature?

The MAX6306UK30D2 has a factory-programmed nominal reset threshold of 3.0V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +85°C. Its temperature coefficient is 40ppm/°C, meaning drift is less than 12mV across a 75°C span - sufficient for reliable 3.3V rail supervision without external trimming. This specification is confirmed in the Electrical Characteristics table of the MAX6305–MAX6313 datasheet (Rev 6).

Does MAX6306UK30D2 support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6306UK30D2 includes a dedicated MR (manual reset) input with an internal 63.5kΩ pull-up resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <0.9V for 3.3V systems) for ≥1.5µs. The pin accepts TTL- or CMOS-level signals and tolerates noise via built-in glitch rejection. No external components are needed - a simple momentary switch to GND suffices. This functionality is explicitly documented in the Pin Description and Electrical Characteristics sections.

What is the reset timeout period of MAX6306UK30D2, and is it guaranteed over temperature?

The MAX6306UK30D2 features a factory-programmed reset timeout period of 20ms minimum (D2 suffix), with typical value 28ms and maximum 40ms at +25°C. The datasheet confirms this timeout remains stable across temperature: normalized variation is ±1% from –40°C to +85°C, as shown in Figure 6 (RESET TIMEOUT vs. TEMPERATURE). This ensures consistent µP initialization timing regardless of ambient conditions.

Can MAX6306UK30D2 monitor a second voltage rail, and how is that implemented?

Yes, MAX6306UK30D2 includes a dedicated RST IN pin that functions as an adjustable undervoltage comparator input referenced to an internal 1.23V threshold. By connecting an external resistor divider from the secondary rail to RST IN and GND, designers can program a custom reset point - for example, detecting 5.0V rail dropout at 4.75V. Input leakage is ±25nA, enabling megohm-level resistors with minimal error, as detailed in the Adjustable Reset Inputs section.

What package type and footprint does MAX6306UK30D2 use, and are lead-free variants available?

MAX6306UK30D2 is supplied in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm with 0.95mm height. Lead-free versions are available by specifying the "+T" suffix (e.g., MAX6306UK30D2+T) instead of "-T", per Maxim's ordering guidelines. The package supports standard reflow profiles: +260°C peak for lead-free, +240°C for leaded assemblies.