Analog Devices Inc./Maxim Integrated MAX6306UK29D4+T

Overview

MAX6306UK29D4+T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC for undervoltage conditions and asserts an active-low push/pull RESET signal when the supply falls below 2.93V (±2.5% over temperature), with a factory-programmed 1120ms minimum reset timeout. It features manual-reset input (MR), guaranteed RESET validity down to VCC = 1V, and immunity to fast transients-ideal for reliable power-up sequencing in dual-voltage embedded systems.

For engineers reviewing the MAX6306UK29D4+T datasheet, MAX6306UK29D4+T pinout, MAX6306UK29D4+T application, or MAX6306UK29D4+T equivalent, this device delivers precision reset supervision with low 8µA supply current, factory-trimmed threshold accuracy, transient-immune operation, and direct integration into space-constrained portable and industrial control designs.

Technical Context

The MAX6306UK29D4+T uses an internal factory-trimmed voltage divider to monitor VCC against a nominal 2.93V reset threshold, with ±2.5% tolerance over –40°C to +85°C. Its push/pull RESET output sources/sinks current and remains valid down to VCC = 1V, eliminating external pull-up requirements in most applications.

It integrates a manual-reset input (MR) with internal 63.5kΩ pull-up, TTL/CMOS-compatible logic thresholds, and 1.5µs minimum pulse width support. The device ignores short VCC transients-up to ~100µs at 100mV overdrive-and provides guaranteed reset assertion during brownout, power-up, and power-down sequences.

Key Specifications

Pinout & Package

MAX6306UK29D4+T is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (outline U5+1), optimized for high-density PCB layouts and reflow soldering. Footprint matches JEDEC MO-178AA standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK29D4+T, the D3 variant offers faster reset release for responsive systems, while the TPS3808G33DBVR trades manual reset and dual-input flexibility for significantly lower quiescent current and tighter threshold tolerance-making it suitable only where those features are expendable.

Availability

MAX6306UK29D4+T is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, automotive body electronics, and PoE-powered networking equipment requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6306UK29D4+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 design leader specializing in high-performance analog, mixed-signal, and power-management solutions for demanding industrial, automotive, and communications applications.

The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision-delivering precision reset thresholds, transient immunity, and compact packaging for space- and reliability-critical embedded systems.

FAQ

What is the exact factory-programmed reset threshold voltage for MAX6306UK29D4+T?

The MAX6306UK29D4+T has a nominal VCC reset threshold of 2.93V, with ±2.5% tolerance over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed using an internal voltage divider and corresponds to the "29" suffix per Table 1 in the datasheet. The actual measured threshold for a given unit falls between 2.86V and 3.00V at +25°C, and between 2.83V and 3.03V across temperature.

Does MAX6306UK29D4+T support manual reset functionality, and how is it implemented?

Yes, MAX6306UK29D4+T includes a dedicated MR (manual-reset) input on Pin 4. Pulling MR low forces an immediate reset assertion, which persists for the full 1120ms timeout period after MR returns high. The pin features an internal 63.5kΩ pull-up resistor, enabling direct connection to a normally-open momentary switch tied to ground-no external components are required. Logic thresholds are VIL ≤ 0.3×VCC and VIH ≥ 0.7×VCC.

What is the minimum VCC voltage at which MAX6306UK29D4+T guarantees valid RESET output operation?

MAX6306UK29D4+T guarantees valid RESET output down to VCC = 1.0V. Below this, the push/pull driver's sink/source capability degrades significantly. The device remains functional and will assert RESET if VCC drops below 2.93V, but the output voltage levels may no longer meet logic-level specifications. For applications requiring RESET validity below 1V, an external pull-down or pull-up resistor is recommended per the datasheet Figure 4/5 guidance.

Can MAX6306UK29D4+T monitor a second voltage rail besides VCC?

Yes, MAX6306UK29D4+T includes an adjustable RST IN input (Pin 3) designed to monitor a secondary supply. By connecting an external resistor divider between the target rail and ground, the voltage at RST IN is compared to an internal 1.23V reference. When the divided voltage falls below this threshold, the device asserts RESET-enabling independent supervision of a 5V PHY rail, analog supply, or other auxiliary voltage alongside the primary 3.3V VCC rail.

What package type and RoHS status does MAX6306UK29D4+T use?

MAX6306UK29D4+T is supplied in a lead-free, RoHS-compliant 5-pin SOT23 package (package code U5+1, outline 21-0057). The "+T" suffix explicitly denotes lead-free termination per JEDEC J-STD-020. It is compatible with standard reflow profiles and requires no special handling beyond typical moisture-sensitive device (MSL3) precautions.