Analog Devices Inc./Maxim Integrated MAX6474TA33BD3+T

Overview

MAX6474TA33BD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.3V output, -12.5% reset threshold accuracy, and 150ms minimum reset timeout. It features 82µA quiescent current, 114mV dropout at full load, and active-low push-pull RESET output. Designed for battery-powered portable systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6474TA33BD3+T datasheet, MAX6474TA33BD3+T pinout, MAX6474TA33BD3+T application, or MAX6474TA33BD3+T equivalent, this device delivers verified 3.3V regulation with integrated supervisor functionality, shutdown control, and thermal/short-circuit protection - critical for handheld instruments, USB peripherals, and wireless modules where supply stability and reset integrity are non-negotiable.

Technical Context

The MAX6474TA33BD3+T implements a precision bandgap-referenced LDO core with internal feedback resistors set for 3.3V output and a dedicated reset comparator sharing the same reference. Its reset circuit asserts active-low RESET when VOUT falls below 87.5% of nominal (i.e., 2.8875V) and holds it for ≥150ms after recovery.

This variant belongs to the MAX6471–MAX6474 subfamily: it includes both SHDN (active-low shutdown) and MR (active-low manual reset) inputs, enabling controlled power-down and operator-initiated reset while VOUT remains in specification. The device uses an 8-pin TDFN-EP package with exposed paddle for thermal management.

Key Specifications

Pinout & Package

MAX6474TA33BD3+T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.75mm height) package with exposed thermal pad. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is MR; Pin 6 is SET; Pin 7 is OUT; Pin 8 is NC (no connect). The exposed paddle (EP) is internally connected to GND and must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76333QDBVRQ1 and ADP196ACBZ-3.3-R7, MAX6474TA33BD3+T uniquely combines MR input, thermal hysteresis, and 0.01µA reverse leakage - making it optimal for portable devices requiring field-serviceable reset and battery backup integrity.

Availability

MAX6474TA33BD3+T is available at Aetrix Electronics and suitable for handheld instruments, USB peripheral designs, and Bluetooth module development requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6474TA33BD3+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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, communications, and consumer markets.

The MAX6469–MAX6484 product line was designed specifically for space-constrained, battery-powered portable equipment needing integrated power regulation and microprocessor supervision in a single compact package.

FAQ

What is the reset timeout period for MAX6474TA33BD3+T?

The MAX6474TA33BD3+T has a 150ms minimum reset timeout period (suffix D3), meaning RESET remains asserted for at least 150ms after VOUT recovers above the -12.5% threshold or after MR returns high. This duration is factory-trimmed and guaranteed across temperature and process variation.

Does MAX6474TA33BD3+T support adjustable output voltage?

No, MAX6474TA33BD3+T is configured for fixed 3.3V output. Its SET pin is internally connected to GND for preset operation; connecting external resistors to SET will not alter the output voltage. For adjustable variants, consider MAX6471 or MAX6472 with appropriate suffixes.

How does the manual reset (MR) function work on MAX6474TA33BD3+T?

On MAX6474TA33BD3+T, pulling MR low asserts RESET immediately-even if VOUT is within specification-and holds RESET low for the full 150ms timeout after MR returns high. An internal 40kΩ pullup to VOUT eliminates external components; MR accepts TTL/CMOS logic levels.

What package type is used for MAX6474TA33BD3+T?

MAX6474TA33BD3+T uses an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad. The "TA" in the part number explicitly denotes the TDFN variant, distinguishing it from SOT23-6 ("UT") or UCSP ("BL") versions in the same family.

Is MAX6474TA33BD3+T RoHS-compliant and lead-free?

Yes, MAX6474TA33BD3+T is RoHS-compliant and lead-free. The "+T" suffix indicates lead(Pb)-free/RoHS-compliant packaging per Maxim's ordering convention; the device meets JEDEC J-STD-020 reflow profile requirements for Pb-free assembly.

What protection features are integrated into MAX6474TA33BD3+T?

MAX6474TA33BD3+T integrates thermal shutdown (180°C trip, 20°C hysteresis), short-circuit current limiting (450mA min), reverse OUT-to-IN current blocking (0.01µA typ), and input undervoltage lockout (2.25V). These operate autonomously without external components.