Analog Devices Inc./Maxim Integrated MAX6306UK29D3

Overview

The MAX6306UK29D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC for undervoltage conditions and provides a push/pull active-low reset output. It features a factory-trimmed reset threshold of 2.93V (±2.5% over temperature), 140ms minimum reset timeout, manual-reset input (MR), and guaranteed RESET assertion down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset signaling.

For engineers reviewing the MAX6306UK29D3 datasheet, MAX6306UK29D3 pinout, MAX6306UK29D3 application, or MAX6306UK29D3 equivalent, this page delivers verified electrical specs, thermal stability data, MR timing behavior, reset threshold hysteresis, and real-world transient immunity characteristics - all confirmed from Maxim's official 19-1145 Rev 6 datasheet.

Technical Context

The MAX6306UK29D3 implements a factory-trimmed internal voltage divider to monitor VCC against a precision 1.23V reference, enabling accurate 2.93V reset threshold detection with ±2.5% tolerance across –40°C to +85°C. Its reset generator includes a temperature-stable RC timer delivering 140ms (min) timeout after all monitored supplies return to regulation.

This device integrates a manual-reset input with 63.5kΩ internal pull-up, TTL/CMOS-compatible logic thresholds, and glitch rejection (<0.1µs). It asserts reset on VCC drop below threshold or MR low assertion, and maintains reset for the full timeout period after MR release - supporting deterministic system initialization in noisy environments.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (U5+1 outline, 21-0057), surface-mount, RoHS-compliant, tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6306UK29D2 and TPS3808G33DBVR, the MAX6306UK29D3 uniquely balances factory-trimmed 2.93V accuracy, 140ms industrial-grade timeout, integrated MR functionality, and SOT23 footprint - making it optimal for cost-sensitive, thermally demanding embedded controllers requiring deterministic reset sequencing.

Availability

MAX6306UK29D3 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body control modules, point-of-sale terminals, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6306UK29D3 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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and automotive markets.

The MAX6305–MAX6313 family was engineered specifically for multivoltage system supervision - delivering factory-programmable reset thresholds, manual-reset capability, and transient-immune monitoring in minimal 5-pin SOT23 packages.

FAQ

What is the exact factory-trimmed reset threshold voltage for MAX6306UK29D3?

The MAX6306UK29D3 has a nominal VCC reset threshold of 2.93V, corresponding to the "29" suffix per Table 1 in Maxim's datasheet (19-1145 Rev 6). This value is factory-trimmed with ±2.5% tolerance over –40°C to +85°C and ±1.5% at +25°C. The threshold is set by an internal resistor divider referenced to a 1.23V bandgap, ensuring stability without external components. MAX6306UK29D3 achieves this specification without user calibration.

Does MAX6306UK29D3 support manual reset, and what are its timing requirements?

Yes, MAX6306UK29D3 includes a dedicated MR pin with internal 63.5kΩ pull-up. A logic-low pulse ≥1.5µs (over temperature) on MR forces reset assertion for the full 140ms timeout period after MR returns high. The MR input accepts TTL-level lows (≤0.8V) and CMOS-level highs (≥0.7×VCC), enabling direct interface with 3.3V or 5V logic. MAX6306UK29D3 requires no external debounce circuitry due to built-in 0.1µs glitch rejection.

What is the minimum VCC voltage at which MAX6306UK29D3 guarantees valid RESET output?

MAX6306UK29D3 guarantees valid active-low RESET output down to VCC = 1V, as specified in the Electrical Characteristics table. Below 1V, push/pull drive strength degrades significantly; however, for applications requiring reset validity to 0V, a 100kΩ pull-down resistor from RESET to GND is recommended. This design constraint is inherent to the MAX6306UK29D3's output stage architecture and is documented in the "Ensuring a Valid RESET Output Down to VCC = 0V" section.

Can MAX6306UK29D3 monitor voltages other than VCC?

Yes, MAX6306UK29D3 includes a dedicated RST IN pin that accepts an externally divided voltage for monitoring secondary rails (e.g., 12V, 5V, or analog supplies). When the RST IN voltage falls below the internal 1.23V reference, it triggers reset independently of VCC. This allows dual-supply supervision - for example, using MAX6306UK29D3 to monitor both a 3.3V logic rail (via VCC) and a 12V motor supply (via RST IN) in the same system.

What package type and RoHS status does MAX6306UK29D3 use?

MAX6306UK29D3 is supplied in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), compliant with JEDEC MO-178. It is available in both leaded (suffix -T) and lead-free (suffix +T) versions. The standard ordering part number MAX6306UK29D3-T indicates leaded packaging; replacing "-T" with "+T" specifies RoHS-compliant lead-free finish. All units ship in tape-and-reel format per standard ordering requirements.