Analog Devices Inc./Maxim Integrated MAX6306UK46D3-T

Overview

MAX6306UK46D3-T from Maxim Integrated is a precision 5-pin SOT23 programmable reset IC designed to monitor VCC supply voltage and assert an active-low push/pull RESET signal when VCC falls below 4.63V (±2.5% over temperature), with factory-programmed 140ms minimum reset timeout, manual-reset input (MR), and guaranteed RESET validity down to VCC = 1V. It serves as a system-level power supervisor in multivoltage embedded controllers.

For engineers reviewing the MAX6306UK46D3-T datasheet, MAX6306UK46D3-T pinout, MAX6306UK46D3-T application, or MAX6306UK46D3-T equivalent, key selection criteria include its 4.63V factory-trimmed threshold, 140ms timeout, MR input compatibility with TTL/CMOS logic, immunity to fast VCC transients, and operation across 0°C to +70°C in leaded SOT23-5 packaging.

Technical Context

The MAX6306UK46D3-T implements a factory-trimmed internal voltage divider to monitor VCC against a precise 1.23V reference, enabling accurate 4.63V reset threshold detection with ±2.5% tolerance over full temperature range. Its reset generator includes a monolithic timer that guarantees ≥140ms assertion after power-up or MR release.

This device integrates a manual-reset input with 63.5kΩ internal pull-up, supports undervoltage monitoring only on VCC (no external RST IN_ or OVRST IN inputs), and features push/pull RESET output capable of sourcing 800µA or sinking 3.2mA - eliminating need for external pull-up resistors in most µP interface configurations.

Key Specifications

Pinout & Package

MAX6306UK46D3-T is housed in a 5-pin SOT23-5 surface-mount package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant leaded finish (-T suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar reset supervision applications.

Compared with MAX6306UK46D2-T and TPS3808G33DBVR, the MAX6306UK46D3-T uniquely combines 4.63V precision threshold, 140ms timeout, and integrated manual reset in a 5-pin SOT23 - making it optimal for commercial-grade 5V embedded controllers needing robust brownout response and operator-initiated recovery.

Availability

MAX6306UK46D3-T is available at Aetrix Electronics and suitable for portable computers, industrial controllers, intelligent instruments, and multivoltage embedded systems requiring stable component supply with guaranteed commercial-temperature performance and tape-and-reel delivery.

Supply support for MAX6306UK46D3-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, computing, and communications applications.

The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, low-power systems - delivering precision reset thresholds, factory-programmed timeouts, and integrated manual reset in minimal SOT23-5 packaging.

FAQ

What is the exact reset threshold voltage of the MAX6306UK46D3-T?

The MAX6306UK46D3-T has a factory-trimmed nominal VCC reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of 0°C to +70°C. This value is derived from Table 1 in the datasheet, where "46" corresponds to 4.63V (4.514V min / 4.746V max at room temperature, ±2.5% over temp). The threshold is set via internal laser-trimmed resistors and requires no external components.

Does the MAX6306UK46D3-T support external voltage monitoring inputs like RST IN or OVRST IN?

No, the MAX6306UK46D3-T monitors only the VCC supply through its internal factory-trimmed voltage divider and does not utilize the RST IN or OVRST IN pins. Pin 3 (RST IN) is not connected internally and should be left floating or tied to VCC per the datasheet recommendation. This distinguishes it from variants like MAX6307/MAX6313 which implement those additional inputs.

What is the function and electrical behavior of the MR pin on the MAX6306UK46D3-T?

The MR (Manual Reset) pin on the MAX6306UK46D3-T is an active-low input with an internal 63.5kΩ pull-up resistor. Pulling MR low forces RESET assertion immediately, and RESET remains active for the full 140ms timeout period after MR returns high. It accepts TTL logic levels in 5V systems and CMOS levels in 3V systems, and requires no external debounce circuitry due to built-in 0.1µs glitch rejection.

Can the MAX6306UK46D3-T operate with VCC below 4.63V?

Yes - the MAX6306UK46D3-T remains functional and guarantees valid RESET output down to VCC = 1V. However, it only monitors VCC relative to its 4.63V threshold: RESET asserts when VCC falls below that level, and deasserts only after VCC rises above 4.63V + hysteresis (≈4.64V) and the 140ms timer expires. Operation below 4.746V (4.63V + 2.5%) is intentional and necessary for brownout detection.

What package type and compliance status does the MAX6306UK46D3-T use?

The MAX6306UK46D3-T is supplied in a 5-pin SOT23-5 package (package code U5+1, outline 21-0057) with leaded finish. The "-T" suffix indicates standard leaded packaging; lead-free versions use "+T". It meets RoHS requirements per Maxim's packaging nomenclature, and is shipped in tape-and-reel format only, with minimum order quantity of 2,500 pieces for standard versions.