Analog Devices Inc./Maxim Integrated MAX6307UK46D3+T

Overview

MAX6307UK46D3+T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.6V threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert an active-low push/pull RESET output. It features 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring robust brownout and transient immunity.

For engineers reviewing the MAX6307UK46D3+T datasheet, MAX6307UK46D3+T pinout, MAX6307UK46D3+T application, or MAX6307UK46D3+T equivalent, key selection criteria include its dual adjustable reset inputs, factory-trimmed 4.6V VCC threshold with ±2.5% tolerance over temperature, 140ms timeout, SOT23-5 package compatibility, and immunity to fast VCC transients up to 280µs at 4.6V overdrive.

Technical Context

The MAX6307UK46D3+T implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 4.6V nominal, external resistor-programmable RST IN (undervoltage) referenced to 1.23V, and OVRST IN (overvoltage) also referenced to 1.23V. All three comparators feed a shared reset generator with a fixed 140ms minimum timeout period (D3 variant).

Its push/pull RESET output drives high/low actively without external pull-up, supports sink currents up to 3.2mA at VCC > 4.25V, and maintains valid logic levels across –40°C to +85°C. The device ignores transients on all monitored inputs - VCC, RST IN, and OVRST IN - via internal filtering and hysteresis (2.5mV on RST IN/OVRST IN, 2×VTH on VCC).

Key Specifications

Pinout & Package

MAX6307UK46D3+T is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (outline U5+1, land pattern 90-0174), optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-input supervisory IC applications.

Compared with MAX6307UK46D2+T and TPS3808G33DBVR, the MAX6307UK46D3+T uniquely delivers factory-trimmed 4.6V supervision, dual adjustable inputs, and 140ms push/pull reset in a 5-pin SOT23 - enabling compact, multirail fault detection without layout or firmware changes.

Availability

MAX6307UK46D3+T is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body control modules, and test & measurement equipment requiring stable component supply and long-term production continuity.

Supply support for MAX6307UK46D3+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) designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing applications, with emphasis on reliability and integration.

The MAX6305–MAX6313 family was engineered specifically for multivoltage system supervision - delivering simultaneous VCC, RST IN, and OVRST IN monitoring in ultra-small packages for space- and power-constrained embedded control.

FAQ

What is the exact factory-programmed VCC reset threshold for MAX6307UK46D3+T?

The MAX6307UK46D3+T has a factory-trimmed VCC reset threshold of 4.6V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is confirmed in Table 1 of the datasheet and corresponds to the "46" in the part number. The MAX6307UK46D3+T uses an internal resistor divider to achieve this precise threshold without external components.

Does MAX6307UK46D3+T support manual reset functionality?

No, the MAX6307UK46D3+T does not include a manual reset (MR) input. Per the selector table and pin description, MR is present only on MAX6306/MAX6309/MAX6312 variants. The MAX6307UK46D3+T provides three monitoring inputs - VCC, RST IN, and OVRST IN - but no dedicated MR pin. System-level manual reset must be implemented externally if required.

What are the absolute maximum ratings for VCC and other pins on MAX6307UK46D3+T?

The MAX6307UK46D3+T has an absolute maximum VCC rating of –0.3V to +6V. All other pins (RESET, GND, RST IN, OVRST IN) are rated from –0.3V to (VCC + 0.3V). Exceeding these limits may cause permanent damage. These values are specified in the Absolute Maximum Ratings table and apply regardless of operating mode. The MAX6307UK46D3+T must never be operated outside these boundaries, even momentarily.

How does the 140ms reset timeout (D3) behave during a brownout event on the MAX6307UK46D3+T?

During a brownout, when VCC or either adjustable input crosses its threshold, the MAX6307UK46D3+T immediately asserts RESET and resets its internal timeout timer. RESET remains asserted continuously until all monitored inputs exceed their thresholds *and* the full 140ms timeout elapses. This ensures the reset pulse extends beyond recovery, preventing premature release. The MAX6307UK46D3+T guarantees this behavior across –40°C to +85°C.

Can MAX6307UK46D3+T monitor a 3.3V rail using the RST IN pin?

Yes, the MAX6307UK46D3+T can monitor a 3.3V rail using the RST IN pin by connecting an external resistor divider that scales the 3.3V rail down to ≤1.23V when the rail is in regulation. When the rail drops below the programmed threshold (e.g., 2.97V), VRST IN falls below 1.23V and triggers reset. The MAX6307UK46D3+T's ±25nA input leakage enables megohm-level resistors, minimizing divider power loss while maintaining accuracy.