Analog Devices Inc./Maxim Integrated MAX6307UK35D3+T

Overview

The MAX6307UK35D3+T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 3.5V reset threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert a push/pull active-low 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 power-up sequencing and brownout protection.

For engineers reviewing the MAX6307UK35D3+T datasheet, MAX6307UK35D3+T pinout, MAX6307UK35D3+T application, or MAX6307UK35D3+T equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative options - all grounded in Maxim's official documentation for the precise part number.

Technical Context

The MAX6307UK35D3+T implements a triple-monitor architecture: factory-trimmed VCC monitoring at 3.5V ±2.5%, an external resistor-programmable RST IN input referenced to 1.23V, and a separate OVRST IN input for overvoltage detection. All three inputs feed independent comparators with built-in hysteresis (2.5mV on RST IN_/OVRST IN, ~7mV on VTH).

Its internal reset generator guarantees assertion of the push/pull RESET output for ≥140ms after all monitored supplies stabilize above their thresholds, and it remains asserted during any subsequent dip below threshold - with immunity to transients ≤200µs at 100mV overdrive (per Typical Operating Characteristics TOC7/TOC8/TOC9). The device operates across 0°C to +70°C and draws only 8µA typical supply current.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin, single-row, gull-wing leaded or lead-free (RoHS-compliant) surface-mount package with standard land pattern 90-0174.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6307UK35D3+T, the MAX6307UK33D3+T offers identical functionality with a 0.2V lower factory threshold - ideal for strict 3.3V systems - while the TPS3808G33DBVR sacrifices monitoring flexibility for significantly lower current, making it viable only in single-rail, battery-critical designs.

Availability

The MAX6307UK35D3+T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics devices, automotive infotainment units, and smart energy meters requiring stable component supply across commercial temperature range and long-term production continuity.

Supply support for MAX6307UK35D3+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 U.S.-based 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 embedded systems needing simultaneous supervision of main supply, auxiliary rails, and overvoltage conditions - delivering precision, low power, and transient immunity in minimal SOT23-5 footprint.

FAQ

What is the factory-programmed VCC reset threshold for the MAX6307UK35D3+T?

The MAX6307UK35D3+T has a factory-programmed VCC reset threshold of 3.5V, specified as 3.5V ±2.5% over the full operating temperature range (-40°C to +85°C). This value is set via an internal trimmed voltage divider and corresponds to the "35" in the part number per Maxim's ordering convention (UK35 = 3.5V nominal threshold). The MAX6307UK35D3+T does not require external resistor networks to configure this primary monitoring function.

Does the MAX6307UK35D3+T support both undervoltage and overvoltage monitoring on external rails?

Yes, the MAX6307UK35D3+T supports both functions via dedicated inputs: RST IN serves as an adjustable undervoltage monitor (asserts RESET when input falls below programmed threshold), and OVRST IN serves as an adjustable overvoltage monitor (asserts RESET when input exceeds programmed threshold). Both reference the same 1.23V internal comparator threshold and accept external resistor dividers for precise trip-point configuration - a capability confirmed in the Pin Description and Detailed Description sections of the datasheet.

What is the reset timeout period for the MAX6307UK35D3+T, and how is it set?

The MAX6307UK35D3+T has a factory-programmed reset timeout period of 140ms (minimum), indicated by the "D3" suffix in the part number (D1 = 1ms, D2 = 20ms, D3 = 140ms, D4 = 1120ms). This timeout is internally generated and begins only after all monitored supplies (VCC, RST IN, OVRST IN) exceed their respective thresholds. No external capacitor or resistor is needed to set or adjust this delay - it is fully integrated and calibrated during manufacturing.

Is the RESET output of the MAX6307UK35D3+T open-drain or push/pull?

The MAX6307UK35D3+T features an active-low push/pull RESET output - not open-drain. As confirmed in the Pin Description and Electrical Characteristics tables, it can both sink up to 3.2mA (at VCC > 4.25V) and source current, eliminating the need for an external pull-up resistor. This differs from the MAX6305/MAX6306 variants and aligns with the MAX6307/MAX6310/MAX6313 group's complementary output structure.

What package type and RoHS status does the MAX6307UK35D3+T use?

The MAX6307UK35D3+T is supplied in a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) and is RoHS-compliant. The "+T" suffix explicitly denotes lead-free packaging per Maxim's ordering convention - replacing the legacy "-T" designation. Its compact 2.9mm × 1.6mm footprint supports high-density PCB layouts in portable and space-constrained applications.