Analog Devices Inc./Maxim Integrated MAX6330LUR+T

Overview

The 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 a regulated 5.0V shunt voltage (±1.5% tolerance), asserts RESET for ≥140ms after V_SHUNT exceeds 4.63V, and operates across -40°C to +85°C with 100µA–50mA shunt current range. It enables reliable µP supervision in high-voltage microcontroller systems such as industrial controllers and intelligent instruments.

For engineers reviewing the MAX6330LUR+T datasheet, MAX6330LUR+T pinout, MAX6330LUR+T application, or MAX6330LUR+T equivalent, key selection criteria include its 4.63V reset threshold, 5.0V shunt regulation, active-low push/pull RESET output, 140ms timeout without external components, and SOT23-3 footprint compatibility with space-constrained embedded designs.

Technical Context

The MAX6330LUR+T integrates a precision bandgap-based shunt regulator and a dedicated reset generator with internal 140ms timeout timer. Its reset logic monitors V_SHUNT continuously: RESET remains low when V_SHUNT falls below 4.63V (±1.5%), and stays low for 140ms after recovery-ensuring µP initialization stability during brownout recovery.

V_SHUNT regulation is maintained via a pass transistor sinking 100µA–50mA, with ±40ppm/°C tempco and <±3% total error at max load/temperature. The device uses no external timing components and requires only a single series resistor (R_S) and optional bypass capacitor (C_L ≥ 0.03µF) for full operation.

Key Specifications

Pinout & Package

MAX6330LUR+T is housed in a RoHS-compliant 3-pin SOT23-3 package (package code U3+1, outline 21-0151), with 1.9mm pitch and thermal resistance Θ_JA = 0.25°C/mW on standard PCB mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326LUR+T and TLV803EB33DBZR, the MAX6330LUR+T uniquely combines 5.0V regulation, 4.63V reset threshold, and active-low push/pull output in one SOT23-3 device-enabling drop-in replacement in legacy 5V µP designs without layout or firmware changes.

Availability

MAX6330LUR+T is available at Aetrix Electronics and suitable for industrial controllers, household appliances, and intelligent instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

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 MAX6330/MAX6331 family was engineered to replace multi-component power-supervision solutions in space-constrained µP systems-delivering precision regulation and deterministic reset in the smallest possible footprint.

FAQ

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

The MAX6330LUR+T provides a nominal shunt voltage of 5.0V with ±1.5% tolerance over temperature and load, and a reset threshold of 4.63V (also ±1.5%). These values are factory-trimmed and specified across -40°C to +85°C, ensuring consistent behavior in industrial environments without external calibration. The MAX6330LUR+T achieves this using a precision bandgap reference and matched comparator architecture.

Does the MAX6330LUR+T require external components to generate its 140ms reset timeout?

No, the MAX6330LUR+T features an internally trimmed 140ms reset timeout period with no external components required. This is achieved via on-chip RC timing elements laser-trimmed during manufacturing. Unlike discrete RC reset circuits, the MAX6330LUR+T maintains tight tolerance across temperature and voltage, eliminating drift-related reliability risks in long-lifecycle products.

Can the MAX6330LUR+T drive a microprocessor reset pin directly without a pull-up resistor?

Yes, the MAX6330LUR+T's RESET pin is a push/pull output capable of sinking 3.2mA at 0.4V and sourcing current when high, allowing direct connection to standard µP reset inputs without external pull-up resistors. This differs from open-drain alternatives and simplifies design-especially critical in noise-sensitive applications where pull-up resistors can degrade transient immunity. The MAX6330LUR+T's output stage is fully specified for this interface.

What is the minimum shunt current required for regulation in the MAX6330LUR+T?

The MAX6330LUR+T requires a minimum shunt current of 100µA to maintain regulation at the 5.0V shunt voltage. This low minimum enables reliable operation even when the connected µP enters deep sleep mode with sub-100µA quiescent current. Below this threshold, regulation degrades and V_SHUNT may fall out of specification-so R_S must be sized to guarantee ≥100µA under worst-case VIN(min) and I_LOAD(max) conditions.

Is the MAX6330LUR+T compatible with high-input-voltage applications up to 50V?

Yes, the MAX6330LUR+T supports input voltages up to 50V through the series resistor R_S, with absolute maximum ratings confirming safe operation at this level. Its shunt current capability (100µA–50mA) and thermal design (Θ_JA = 0.25°C/mW) allow robust performance in high-voltage industrial supplies. The MAX6330LUR+T datasheet provides explicit R_S sizing equations to ensure power dissipation remains within the 320mW SOT23-3 limit across temperature.