Analog Devices Inc./Maxim Integrated MAX6330SUR-T

Overview

MAX6330SUR-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 3.3V shunt voltage (±1.5% tolerance), asserts RESET for 140ms after V_SHUNT exceeds 3.06V, operates over 100µA–50mA shunt current, and supports µP-based systems powered from high-voltage sources such as 50V industrial rails or battery stacks.

For engineers reviewing the MAX6330SUR-T datasheet, MAX6330SUR-T pinout, MAX6330SUR-T application, or MAX6330SUR-T equivalent, this device serves as a compact, single-component solution for critical µP power monitoring, brownout protection, and reset timing-especially where board space, reliability, and supply stability are constrained.

Technical Context

The MAX6330SUR-T integrates a precision bandgap-based shunt regulator and a comparator-driven reset generator with internal 140ms timeout timer. Its RESET output remains low while V_SHUNT is below 3.06V (±1.5% over −40°C to +85°C) and stays asserted for exactly 140ms after crossing threshold-no external capacitor required.

It functions as a two-terminal shunt element (SHUNT and GND) with a third terminal (RESET) providing push-pull logic-level output. The device regulates V_SHUNT across a wide 100µA–50mA current range and exhibits 40ppm/°C tempco on both V_SHUNT and reset threshold, ensuring stable operation under thermal variation.

Key Specifications

Pinout & Package

MAX6330SUR-T uses a 3-pin SOT23-3 package (JEDEC MO-178AA, Analog Devices land pattern 90-0179). The package is RoHS-compliant, surface-mountable, and rated for continuous operation up to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC26DBZR and MAX6326UR26-T, the MAX6330SUR-T uniquely combines shunt regulation and reset in one SOT23-3 device, enabling direct HV-to-3.3V conversion with no external active components-ideal for cost-sensitive, space-constrained industrial and appliance designs.

Availability

MAX6330SUR-T is available at Aetrix Electronics and suitable for industrial controller power monitoring, smart appliance microcontroller supervision, and portable medical instrument power sequencing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6330SUR-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, headquartered in Wilmington, MA, with deep expertise in precision voltage references and power supervision ICs.

The MAX6330/MAX6331 family was designed specifically for µP-based systems requiring compact, reliable, and cost-effective power-on reset and rail regulation-targeting industrial, appliance, and instrumentation markets where board space and supply robustness are critical.

FAQ

What is the exact shunt voltage and reset threshold of MAX6330SUR-T?

The MAX6330SUR-T provides a nominal shunt voltage of 3.3V with ±1.5% tolerance over −40°C to +85°C, and a reset threshold of 3.06V (also ±1.5%). These values are factory-trimmed and confirmed in the Electrical Characteristics table of the official Analog Devices datasheet Rev 3 (7/24). The "UR" suffix explicitly denotes the 3.3V/3.06V variant, and the "-T" indicates lead-free packaging.

Can MAX6330SUR-T replace a discrete TL431 + reset IC solution?

Yes-the MAX6330SUR-T replaces both a TL431 shunt regulator and a standalone reset IC in a single SOT23-3 package. It delivers identical 3.3V regulation and 3.06V reset functionality while eliminating external timing capacitors and reducing PCB footprint by >60%. Unlike discrete solutions, MAX6330SUR-T guarantees 140ms reset pulse width and co-located thermal tracking between regulation and reset thresholds.

What is the minimum and maximum shunt current for stable operation of MAX6330SUR-T?

The MAX6330SUR-T requires a minimum shunt current of 100µA to maintain regulation and a maximum of 50mA to avoid exceeding its 320mW power dissipation limit in SOT23-3. Operation outside this range risks loss of regulation (below 100µA) or thermal shutdown (above 50mA). The datasheet specifies these limits under Absolute Maximum Ratings and Electrical Characteristics sections.

Does MAX6330SUR-T require an external bypass capacitor on the SHUNT pin?

Yes-a bypass capacitor (C_L) is required on the SHUNT pin for stability. The datasheet recommends ≥0.03µF (30nF) to ensure stable operation across the full 100µA–50mA shunt current range. Typical designs use 0.1µF ceramic capacitors placed close to the SHUNT pin to suppress load transients and prevent oscillation, as validated in the Stability Boundary Conditions graph.

How does the RESET output behave during a brownout event?

During a brownout, when V_SHUNT drops below 3.06V, the MAX6330SUR-T immediately pulls RESET low. If V_SHUNT recovers above threshold, the internal 140ms timer restarts and RESET remains low for the full timeout period. This behavior prevents µP execution during marginal voltage conditions and is verified in the Detailed Description and Typical Operating Characteristics sections of the MAX6330/MAX6331 datasheet.