Analog Devices Inc./Maxim Integrated MAX6330SUR

Overview

The MAX6330SUR from Maxim Integrated is a precision shunt regulator with integrated active-low power-on reset function in a 3-pin SOT23-3 package. It provides ±1.5% output voltage regulation (3.0V nominal), 140ms reset timeout, and operates across 100µA–50mA shunt current range. It protects microprocessors during power-up, brownout, and power-down in high-voltage supply systems.

For engineers reviewing the MAX6330SUR datasheet, MAX6330SUR pinout, MAX6330SUR application, or MAX6330SUR equivalent, key selection criteria include shunt voltage tolerance, reset threshold accuracy (±1.5%), temperature coefficient (40ppm/°C), guaranteed RESET assertion below 1.0V VSHUNT, and SOT23-3 board-space efficiency for size-constrained µP monitoring.

Technical Context

The MAX6330SUR integrates a two-terminal shunt reference and a dedicated reset generator with internal 140ms timeout timer. Its reset logic asserts active-low RESET while VSHUNT remains below the threshold (2.97V min at +25°C for UR variant) and holds it low for 140ms after VSHUNT rises above threshold - independent of external components.

Shunt regulation relies on internal pass transistor control with ±1.5% initial tolerance and 40ppm/°C tempco over –40°C to +85°C. The device maintains regulation across 100µA–50mA ISHUNT, enabling stable operation under varying load conditions without external compensation.

Key Specifications

Pinout & Package

MAX6330SUR is housed in a 3-pin SOT23-3 package with JEDEC MO-178AC outline, 1.3mm × 2.9mm footprint, and 0.95mm height. Thermal resistance θJA = 250°C/W when soldered on standard PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt-regulator-with-reset applications.

Compared with TLV70330DBVR and MAX6326UR31D3T, the MAX6330SUR uniquely combines shunt regulation and reset in one die-eliminating external resistors, reducing component count, and enabling direct high-voltage sourcing without LDO dropout constraints.

Availability

MAX6330SUR is available at Aetrix Electronics and suitable for industrial microcontroller monitoring, automotive body control modules, and portable medical instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MAX6330SUR 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, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6330 series belongs to Maxim's µP supervisory product line, engineered specifically to replace discrete shunt + reset circuits in space- and cost-sensitive embedded systems.

FAQ

What is the exact shunt voltage and tolerance for MAX6330SUR?

The MAX6330SUR provides a nominal shunt voltage of 3.0V with ±1.5% initial tolerance at +25°C, verified per Maxim's datasheet revision 1 (12/05). This tolerance holds across the full –40°C to +85°C operating range, with a tempco of 40ppm/°C. The UR suffix explicitly denotes the 3.0V variant, confirmed in the Ordering Information table.

Does MAX6330SUR require external components to generate its 140ms reset timeout?

No, the MAX6330SUR features an internal factory-trimmed timer that delivers a precise 140ms reset timeout period without any external capacitors or resistors. This is confirmed in the Features section and Typical Operating Characteristics (TOC03), which shows stable timeout across –40°C to +85°C with no component dependencies.

Can MAX6330SUR operate reliably with VSHUNT below 1.0V?

The MAX6330SUR RESET output is guaranteed valid only down to VSHUNT = 1.0V, as specified in the Electrical Characteristics table. Below this voltage, RESET behavior is undefined - the device may not assert or maintain a valid logic level. System design must ensure VSHUNT stays ≥1.0V during asserted reset for interoperability with µP reset inputs.

What is the minimum and maximum shunt current for stable regulation in MAX6330SUR?

The MAX6330SUR maintains regulation across a shunt current range of 100µA (minimum) to 50mA (maximum), as stated in both the General Description and Electrical Characteristics tables. Operation outside this range risks loss of regulation or invalid reset assertion, particularly below 100µA where the internal reference may not stabilize.

How does the SOT23-3 package of MAX6330SUR impact thermal performance?

The MAX6330SUR in SOT23-3 has a junction-to-ambient thermal resistance (θJA) of 250°C/W when mounted on a standard PCB. To avoid exceeding the +150°C maximum junction temperature, power dissipation must be limited - e.g., at 50mA shunt current and 3.0V, P = 150mW requires ≤60°C ambient rise, necessitating derating above +70°C per the Absolute Maximum Ratings table.