Analog Devices Inc./Maxim Integrated MAX6307UK45D3-T

Overview

MAX6307UK45D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.5V 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. Used in multivoltage embedded systems for reliable power-on and brownout reset generation.

For engineers reviewing the MAX6307UK45D3-T datasheet, MAX6307UK45D3-T pinout, MAX6307UK45D3-T application, or MAX6307UK45D3-T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-supply monitoring capability (VCC + RST IN + OVRST IN), exact reset timeout (D3 = 140ms min), and real-world alternative options with documented functional differences.

Technical Context

The MAX6307UK45D3-T implements a triple-input supervision architecture: factory-trimmed VCC monitor (4.5V ±2.5% over temperature), precision 1.23V reference-based RST IN comparator for external undervoltage detection, and identical OVRST IN comparator for overvoltage detection. All three inputs drive a single internal reset generator with fixed 140ms timeout.

Its push/pull RESET output guarantees VOL ≤ 0.3V at ISINK = 1.2mA and VOH ≥ 0.8×VCC at ISOURCE = 150µA, enabling direct interface with 3.3V/5V µP reset pins without external pull-ups. Immunity to transients <100ns is ensured via internal filtering and hysteresis (2.5mV on RST IN/OVRST IN).

Key Specifications

Pinout & Package

MAX6307UK45D3-T is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant with lead-free termination (-T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6307UK45D3-T, MAX6307UK46D3-T offers a 100mV higher VCC threshold for tighter regulation margin, while TPS3808G33DBVR reduces functionality to single-rail monitoring with open-drain output-making it unsuitable for applications requiring simultaneous VCC, RST IN, and OVRST IN supervision.

Availability

MAX6307UK45D3-T is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive infotainment units, and network infrastructure equipment requiring stable component supply across extended commercial temperature range.

Supply support for MAX6307UK45D3-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 markets.

The MAX6305–MAX6313 family was designed specifically for multivoltage system supervision-enabling simultaneous monitoring of primary, secondary, and auxiliary rails in space-constrained embedded platforms using a single 5-pin IC.

FAQ

What is the exact VCC reset threshold for MAX6307UK45D3-T?

The MAX6307UK45D3-T has a factory-programmed VCC reset threshold of 4.5V nominal, with tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during manufacturing and specified in the Electrical Characteristics table under "Reset Threshold (VTH)" for MAX6307 variants. The "45" in the part number directly encodes the 4.5V threshold per Maxim's ordering convention.

Does MAX6307UK45D3-T support monitoring of both undervoltage and overvoltage conditions on external rails?

Yes, MAX6307UK45D3-T supports both functions via dedicated inputs: RST IN serves as an adjustable undervoltage comparator referenced to 1.23V, while OVRST IN serves as an adjustable overvoltage comparator using the same internal reference. Each accepts an external resistor divider to set custom thresholds-for example, RST IN can monitor a 3.3V rail for drops below 3.0V, and OVRST IN can detect surges above 5.5V on a 5V rail.

What is the function of the D3 suffix in MAX6307UK45D3-T?

The "D3" suffix in MAX6307UK45D3-T specifies a factory-programmed minimum reset timeout period of 140ms. Per Maxim's ordering guide, D1 = 1ms, D2 = 20ms, D3 = 140ms, and D4 = 1120ms. This timeout is generated by an internal oscillator and is guaranteed over temperature-eliminating the need for external RC timing networks and ensuring consistent reset pulse width across all units.

Can MAX6307UK45D3-T operate with a 3.3V supply while monitoring a 5V rail?

No-MAX6307UK45D3-T uses its VCC pin as both power source and the monitored 5V rail. Its VCC operating range is 2.925V to 5.5V, but the factory-set 4.5V threshold applies *only* to the voltage present on the VCC pin. To monitor a separate 5V rail while powered from 3.3V, you would use RST IN or OVRST IN with appropriate resistor dividers; however, VCC itself must be ≥2.925V to power the IC, and the 4.5V threshold cannot be reassigned to another pin.

Is MAX6307UK45D3-T pin-compatible with other devices in the MAX6305–MAX6313 family?

Yes, all MAX6305–MAX6313 devices share identical 5-pin SOT23 pinout (RESET, GND, RST IN, OVRST IN, VCC for MAX6307/MAX6310/MAX6313 variants). However, functionality differs: MAX6305 lacks RST IN/OVRST IN; MAX6306 adds MR but no OVRST IN; only MAX6307, MAX6310, and MAX6313 include both RST IN and OVRST IN. Thus, physical compatibility exists, but electrical substitution requires verifying input/output configuration match.