Analog Devices Inc./Maxim Integrated MAX6330LUR-T

Overview

MAX6330LUR-T from Analog Devices is a precision shunt regulator with integrated active-low power-on reset function in a 3-pin SOT23-3 package. It delivers ±1.5% output voltage tolerance at 5.0V, provides 140ms reset timeout, operates over -40°C to +85°C, and supports 100µA–50mA shunt current range. It protects microprocessors during power-up, brownout, and power-down in high-voltage µP systems.

For engineers reviewing the MAX6330LUR-T datasheet, MAX6330LUR-T pinout, MAX6330LUR-T application, or MAX6330LUR-T equivalent, key selection criteria include shunt voltage accuracy, reset threshold stability (±1.5%), guaranteed reset assertion below 1.2V VSHUNT, and compatibility with high-input-voltage µP supervision where board space is constrained.

Technical Context

The MAX6330LUR-T integrates a precision bandgap-based shunt regulator and a comparator-driven reset generator with internal 140ms timeout timer. Its reset logic asserts active-low RESET when VSHUNT falls below 4.63V (±1.5%), and holds it low for ≥140ms after VSHUNT rises above threshold - no external capacitor required.

It functions as a two-terminal shunt regulator (SHUNT–GND) while providing a third-terminal push-pull reset output referenced to GND. The device maintains regulation across 100µA–50mA ISHUNT and exhibits 40ppm/°C tempco on both VSHUNT and VTH, enabling stable operation in industrial temperature environments.

Key Specifications

Pinout & Package

MAX6330LUR-T uses a 3-pin SOT23-3 package with exposed pad (U3+1 outline), rated for 320mW continuous dissipation (derated above +70°C). Pin 1 = GND, Pin 2 = RESET (active-low), Pin 3 = SHUNT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70733PDBVR and MAX6326LUR-T, the MAX6330LUR-T uniquely combines 5V ±1.5% shunt regulation, 4.63V ±1.5% reset threshold, and factory-trimmed 140ms timeout in one SOT23-3 device - enabling single-component µP supervision in high-input-voltage, space-constrained designs.

Availability

MAX6330LUR-T is available at Aetrix Electronics and suitable for industrial microcontroller supervision, smart appliance power monitoring, and portable instrumentation requiring stable component supply with lead-free compliance and full temperature-range validation.

Supply support for MAX6330LUR-T 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX6330LUR-T belongs to the MAX63xx family of precision supervisory circuits, designed specifically for cost-sensitive, space-constrained µP systems needing integrated shunt regulation and deterministic reset behavior under brownout conditions.

FAQ

What is the exact shunt voltage and reset threshold of MAX6330LUR-T?

The MAX6330LUR-T provides a nominal shunt voltage of 5.0V with ±1.5% tolerance (4.93V–5.07V at +25°C) and a reset threshold of 4.63V ±1.5% (4.56V–4.69V at +25°C). Both parameters exhibit 40ppm/°C temperature coefficient, ensuring stable performance across -40°C to +85°C. These values are factory-trimmed and specified in the official Analog Devices datasheet for MAX6330LUR-T.

Does MAX6330LUR-T require external components to generate its reset pulse?

No, MAX6330LUR-T does not require external components to generate its reset pulse. It features an internal factory-trimmed 140ms timeout timer that holds the active-low RESET output low for ≥140ms after VSHUNT rises above the 4.63V threshold. This eliminates the need for external RC networks, simplifying design and improving reliability compared to discrete reset solutions.

Can MAX6330LUR-T operate with input voltages above 24V?

Yes, MAX6330LUR-T is designed for high-input-voltage systems: its shunt regulator topology allows operation with VIN significantly above VSHUNT, limited only by power dissipation in the external series resistor RS and the device's absolute maximum shunt current (60mA). Typical applications use VIN up to 50V with appropriate RS sizing, as confirmed in the MAX6330LUR-T typical operating circuit and absolute maximum ratings.

What is the minimum shunt current required for MAX6330LUR-T to regulate properly?

The minimum shunt current required for MAX6330LUR-T to maintain regulation is 100µA, as specified in the Electrical Characteristics table. Below this current, VSHUNT deviates from its nominal 5.0V value. This parameter directly affects RS selection: the series resistor must ensure at least 100µA flows through the SHUNT pin even under worst-case conditions (e.g., minimum VIN, maximum VSHUNT, maximum ILOAD).

How does the active-low RESET output of MAX6330LUR-T interface with microcontrollers having bidirectional reset pins?

When interfacing MAX6330LUR-T with µPs having bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor between RESET and the µP pin prevents contention. This isolates the MAX6330LUR-T's push-pull driver from the µP's internal pull-up/down, avoiding indeterminate logic states. The resistor value is chosen to limit current while preserving noise margin - a design detail explicitly documented in the MAX6330LUR-T Applications Information section.