Analog Devices Inc./Maxim Integrated MAX6409BS33-T

Overview

The MAX6409BS33-T from Maxim Integrated is an ultra-low-power, factory-trimmed voltage detector IC designed for monitoring 3.3V system supply rails in battery-powered devices. It features a 3.30V nominal reset threshold (±2.5% over –40°C to +85°C), active-low push-pull output, manual reset input (MR), and guaranteed valid output down to VCC = 1.0V. Its primary role is supervisory circuitry in portable electronics requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6409BS33-T datasheet, MAX6409BS33-T pinout, MAX6409BS33-T application, or MAX6409BS33-T equivalent, this device is selected for low-quiescent-current (500nA) supply monitoring where precise 3.3V threshold accuracy, immunity to short VCC transients, and minimal board space (UCSP-4 package) are critical design requirements.

Technical Context

The MAX6409BS33-T uses a precision bandgap reference comparator with factory-trimmed threshold voltage of 3.30V (±2.5% over temperature), hysteresis of 9.5mV, and tempco of 40ppm/°C. It operates across VCC = 1.2V to 5.5V and asserts its active-low output when VCC falls below VTH.

It includes a manual reset input (MR) with internal 50kΩ pullup, 1µs minimum pulse width requirement, and 100ns glitch rejection. The device ignores fast negative-going VCC transients up to duration limits defined by threshold overdrive - e.g., ~140µs at 10mV overdrive - ensuring robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6409BS33-T is housed in a 4-bump UCSP (Ultra Compact Silicon Package), measuring 2mm × 2mm with bottom-side solder bumps. This chip-scale package delivers 70% smaller footprint than SC70 while maintaining compatibility with standard SMT assembly processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with MAX6409BS33+T, the MAX6409BS33-T offers identical performance in a non-RoHS package, while TPS3808G33DBVR trades manual reset capability and chip-scale size for marginally lower IQ and higher threshold precision - making it suitable only when those specific trade-offs align with system constraints.

Availability

MAX6409BS33-T is available at Aetrix Electronics and suitable for portable electronics, battery-powered instrumentation, and industrial handheld devices requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for MAX6409BS33-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 ICs for industrial, automotive, communications, and consumer applications.

The MAX6406–MAX6411 family was designed specifically for ultra-low-power voltage monitoring in space- and energy-constrained portable systems, emphasizing precision threshold accuracy, minimal quiescent current, and compact chip-scale packaging.

FAQ

What is the exact reset threshold voltage of the MAX6409BS33-T?

The MAX6409BS33-T has a nominal reset threshold voltage of 3.30V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). At +25°C, the threshold is trimmed to 3.30V ±1.5%, per Table 1 in the datasheet. This value is factory-set and requires no external adjustment.

Does the MAX6409BS33-T support manual reset functionality?

Yes, the MAX6409BS33-T includes a dedicated active-low manual reset input (MR) on pin B2. It features an internal 50kΩ pullup resistor, accepts TTL/CMOS logic levels, and requires a minimum 1µs low pulse to assert the output. Leaving MR unconnected defaults it to high via the internal pullup.

What package type and dimensions does the MAX6409BS33-T use?

The MAX6409BS33-T uses a 4-bump UCSP (Ultra Compact Silicon Package) with 2mm × 2mm body size and bottom-side solder bumps. It is not a leaded package - the bumps serve as both electrical and mechanical interconnects, enabling ultra-small footprint and high-density layout.

Can the MAX6409BS33-T operate reliably below 2.0V supply voltage?

Yes, the MAX6409BS33-T guarantees correct output logic state down to VCC = 1.0V, and its specified operating range begins at VCC = 1.2V (minimum) up to 5.5V. This allows it to remain functional during deep brownout events common in battery-powered systems nearing end-of-life.

How does the MAX6409BS33-T handle power supply noise or transients?

The MAX6409BS33-T incorporates built-in immunity to short-duration negative-going VCC transients, rejecting glitches as short as 100ns. Its propagation delay and internal hysteresis (9.5mV) prevent false triggering during switching regulator ripple or load-induced dips, ensuring stable reset signaling in electrically noisy environments.