Analog Devices Inc./Maxim Integrated MAX6403BS46

Overview

MAX6403BS46 from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit designed to monitor 4.63V system supply rails and assert an active-low push-pull reset signal during brownout or power-up conditions. It features ±2.5% threshold accuracy over –40°C to +85°C, 100ms minimum reset timeout, 500nA typical supply current at 3V, and guaranteed reset validity down to VCC = 1.0V. It is used in battery-powered portable electronics requiring reliable, low-quiescent-power voltage monitoring.

For engineers reviewing the MAX6403BS46 datasheet, MAX6403BS46 pinout, MAX6403BS46 application, or MAX6403BS46 equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold, UCSP-4 chip-scale package footprint, push-pull active-low output configuration, manual reset input with internal 50kΩ pullup, and immunity to sub-200ns VCC transients.

Technical Context

The MAX6403BS46 integrates a precision bandgap reference comparator trimmed to a nominal VTH of 4.63V (±2.5% over temperature), with hysteresis of 9.5mV and tempco of 40ppm/°C. Its reset assertion logic is synchronized to VCC crossing VTH, followed by a fixed 100–280ms timeout period before deassertion.

It includes a manual reset (MR) input with 1µs minimum pulse width, 100ns glitch rejection, and internal 50kΩ pullup; MR asserts reset low while active and holds reset for tRP after release. The push-pull RESET output drives low with VOL ≤ 0.4V at ISINK = 100µA (VCC ≥ 1.2V) and high with VOH ≥ 0.8×VCC at ISOURCE = 800µA.

Key Specifications

Pinout & Package

MAX6403BS46 is housed in a 4-bump, 2×2 mm chip-scale package (UCSP-4), with solder bumps arranged in a square layout. The package is lead-free, RoHS-compliant, and qualified per JEDEC J-STD-020 moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6403BS45-T, MAX6403BS46 offers 130mV higher trip point for tighter 5V rail supervision; compared with TPS3808G33DBVR, it delivers 3.2× lower supply current and fixed timing-critical for energy-constrained designs-but lacks adjustable timeout.

Availability

MAX6403BS46 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, wireless IoT edge nodes, automotive infotainment accessories, and battery-backed real-time clock modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6403BS46 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6400–MAX6405 family was designed specifically for ultra-low-power voltage supervision in space-constrained, battery-operated systems-emphasizing minimal quiescent current, chip-scale packaging, and factory-trimmed thresholds to eliminate external components.

FAQ

What is the exact reset threshold voltage of MAX6403BS46?

The MAX6403BS46 has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full –40°C to +85°C operating temperature range. At +25°C, the typical threshold is 4.63V, with min/max values of 4.514V and 4.746V respectively. This value is confirmed in Table 1 of the official datasheet and corresponds to the "46" suffix in the part number.

Does MAX6403BS46 require external components to operate?

No, MAX6403BS46 operates autonomously with no external components required. It integrates a precision bandgap reference, comparator, reset timer, and 50kΩ internal pullup on the MR pin. Only VCC, GND, RESET, and MR connections are needed-no resistors, capacitors, or trimming elements are necessary for basic supervision functionality.

What package type and dimensions does MAX6403BS46 use?

MAX6403BS46 uses a 4-bump, 2mm × 2mm chip-scale package (UCSP-4) with solder bumps arranged in a square layout (A1/GND, B1/RESET, B2/MR, A2/VCC). The package height is 0.5mm max, and it complies with JEDEC MO-220 and IPC/JEDEC J-STD-020 MSL Level 1 standards.

Can MAX6403BS46 be used with a 3.3V microcontroller I/O rail?

Yes, MAX6403BS46 is compatible with 3.3V systems. Its RESET output is push-pull and guarantees VOH ≥ 0.8×VCC and VOL ≤ 0.4V (at ISINK = 100µA, VCC ≥ 1.2V), ensuring clean logic levels into 3.3V CMOS inputs. The MR input accepts TTL/CMOS-compatible thresholds (VIH ≥ 0.7×VCC), and VCC can be as low as 1.2V while maintaining reset validity.

How does the manual reset (MR) function work on MAX6403BS46?

On MAX6403BS46, the MR pin is active-low with an internal 50kΩ pullup to VCC. Pulling MR below 0.2×VCC asserts RESET low immediately and holds it for the full reset timeout period (100–280ms) after MR returns high. A momentary switch from MR to GND suffices-no external debouncing is needed due to 100ns glitch rejection and 1µs minimum pulse width requirement.