Analog Devices Inc./Maxim Integrated MAX6306UK47D3

Overview

MAX6306UK47D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC supply voltage and asserts an active-low open-drain reset signal when VCC falls below its factory-set 4.7V threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C). It features a 140ms minimum reset timeout, manual reset input (MR), and immunity to fast transients - ideal for reliable power-on reset in 5V microprocessor systems such as industrial controllers and embedded instrumentation.

For engineers reviewing the MAX6306UK47D3 datasheet, MAX6306UK47D3 pinout, MAX6306UK47D3 application, or MAX6306UK47D3 equivalent, key selection criteria include factory-trimmed 4.7V VCC threshold accuracy, guaranteed RESET validity down to VCC = 1V, 8µA supply current, MR input compatibility with TTL/CMOS logic, and SOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6306UK47D3 uses an internal factory-trimmed resistor divider to monitor VCC against a precision bandgap reference, enabling fixed-threshold detection without external components. Its reset generator includes a temperature-stable RC timer delivering a nominal 140ms (min) timeout after VCC recovery.

This variant integrates a manual-reset input (MR) with internal 63.5kΩ pull-up and 1.5µs minimum pulse width requirement, and supports undervoltage monitoring only on VCC - unlike MAX6307/MAX6313, it lacks adjustable RST IN_/OVRST IN inputs. Reset output is open-drain, requiring an external pull-up for active-low assertion.

Key Specifications

Pinout & Package

Package: SOT23-5 (U5-1), 5-pin surface-mount package with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm height - optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK47D3, the MAX6306UK46D3 offers a lower threshold for earlier brownout response but identical form-factor and feature set, while TLV809K33DBZR trades threshold flexibility and MR capability for extreme low-power operation in simpler 3.3V designs.

Availability

MAX6306UK47D3 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and automotive body control modules requiring stable component supply with guaranteed long-term availability and RoHS-compliant sourcing.

Supply support for MAX6306UK47D3 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 to replace discrete RC reset circuits in multivoltage microprocessor systems, delivering precision threshold monitoring, transient immunity, and compact packaging for space- and reliability-critical applications.

FAQ

What is the exact factory-set reset threshold voltage for MAX6306UK47D3?

The MAX6306UK47D3 has a nominal VCC reset threshold of 4.70V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This value is factory-trimmed via laser adjustment of an internal resistor divider and is confirmed in Table 1 of the official datasheet (Rev 5, April 2008).

Does MAX6306UK47D3 support manual reset functionality?

Yes, MAX6306UK47D3 includes a dedicated MR (manual reset) input on Pin 3. A logic-low pulse ≥1.5µs forces reset assertion; the internal 63.5kΩ pull-up resistor allows the pin to be left unconnected for default inactive operation. The MR function is fully supported per the Electrical Characteristics table and Detailed Description section.

What is the reset timeout period for MAX6306UK47D3, and is it adjustable?

MAX6306UK47D3 provides a factory-programmed minimum reset timeout of 140ms (D3 suffix), with typical variation of ±20% over temperature. This timeout is non-adjustable - it is implemented via an internal RC oscillator and cannot be modified with external components. The value is guaranteed across the full operating temperature range.

Can MAX6306UK47D3 monitor voltages other than VCC?

No, MAX6306UK47D3 monitors only the VCC supply pin. Unlike MAX6307 or MAX6313 variants, it does not include RST IN_ or OVRST IN inputs for external voltage monitoring. Its supervision is limited to the 4.7V threshold on the VCC rail, as confirmed in the Selector Table and Pin Description sections of the datasheet.

What package type and RoHS status does MAX6306UK47D3 use?

MAX6306UK47D3 is supplied in a 5-pin SOT23 package (package code U5-1), with lead-free option available as MAX6306UK47D3+T. The standard tape-and-reel version MAX6306UK47D3-T uses leaded terminations. Both comply with JEDEC moisture sensitivity level MSL3 and are rated for reflow soldering per J-STD-020.