Analog Devices Inc./Maxim Integrated MAX6307UK31D3-T

Overview

MAX6307UK31D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC, an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN), asserting an active-low push/pull RESET output when any threshold is violated. It features a factory-set 3.1V ±2.5% VCC reset threshold, 140ms (min) 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 MAX6307UK31D3-T datasheet, MAX6307UK31D3-T pinout, MAX6307UK31D3-T application, or MAX6307UK31D3-T equivalent, this page delivers verified electrical parameters, confirmed pin functions, real-world use scenarios for 3.3V/5V systems, and two validated alternative parts with documented functional and timing differences.

Technical Context

The MAX6307UK31D3-T implements a triple-monitor architecture: internal factory-trimmed resistor divider for VCC supervision at 3.1V, external resistor-divider–based comparator for RST IN (undervoltage), and OVRST IN (overvoltage), all referenced to a 1.23V internal bandgap. Its reset generator uses a precision RC timer to enforce a minimum 140ms timeout after all monitored voltages return to regulation.

It employs push/pull RESET output logic (sinking and sourcing capability), eliminating need for external pull-up resistors. Immunity to fast transients is achieved via internal filtering and hysteresis (2.5mV on RST IN/OVRST IN, 2×VTH on VTH), with guaranteed operation across 0°C to +70°C and VCC range of (3.1V × 1.025) to +5.5V.

Key Specifications

Pinout & Package

MAX6307UK31D3-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, tape-and-reel packaged.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6307UK31D2-T and TPS3808G33DBVR, the MAX6307UK31D3-T uniquely combines factory-set 3.1V VCC monitoring, user-configurable over/undervoltage inputs, push/pull output, and 140ms timeout - making it optimal for multivoltage systems demanding coordinated, glitch-immune reset sequencing without external components.

Availability

MAX6307UK31D3-T is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, automotive body control modules, network edge gateways, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6307UK31D3-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 high-performance analog and mixed-signal ICs for power, sensing, interface, and reliability-critical applications.

The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, low-power embedded systems - emphasizing precision threshold accuracy, transient immunity, and minimal external component count.

FAQ

What is the exact factory-set VCC reset threshold for MAX6307UK31D3-T?

The MAX6307UK31D3-T has a factory-trimmed VCC reset threshold of 3.1V, specified with ±2.5% tolerance over the 0°C to +70°C operating temperature range. This value is permanently programmed via internal resistor trimming during manufacturing and cannot be adjusted externally. The "31" in the part number explicitly denotes the 3.1V nominal threshold per Maxim's ordering convention.

Does MAX6307UK31D3-T support overvoltage detection on external supplies?

Yes, the MAX6307UK31D3-T supports overvoltage detection via its OVRST IN pin (Pin 4). When an external voltage divider applies a voltage exceeding the internal 1.23V reference to OVRST IN, the device asserts RESET. This allows monitoring of secondary rails like 5V analog supplies or PoE-derived voltages - a capability not present in single-threshold supervisors such as the TPS3808 series.

What is the guaranteed minimum reset timeout period for MAX6307UK31D3-T?

The MAX6307UK31D3-T guarantees a minimum reset timeout period of 140ms, as indicated by the "D3" suffix. This is the duration RESET remains asserted after all monitored supplies (VCC, RST IN, OVRST IN) return above their respective thresholds. The actual timeout may extend up to 280ms under worst-case conditions, but 140ms is the design-minimum enforced by the internal RC timer.

Can MAX6307UK31D3-T operate with a 3.3V supply?

Yes, MAX6307UK31D3-T is fully compatible with 3.3V systems. Its VCC operating range starts at 3.178V (3.1V × 1.025), well within standard 3.3V ±5% tolerance. It draws only 8µA typical supply current, making it ideal for battery-powered 3.3V applications. The device also guarantees valid RESET output down to VCC = 1V, supporting graceful brownout response.

Is MAX6307UK31D3-T pin-compatible with other devices in the MAX6305–MAX6313 family?

Yes, all MAX6305–MAX6313 devices share identical 5-pin SOT23 pinout and footprint. The MAX6307UK31D3-T uses Pins 1 (RESET), 2 (GND), 3 (RST IN), 4 (OVRST IN), and 5 (VCC) - matching the MAX6307/MAX6310/MAX6313 variant group. This allows drop-in replacement within the same functional subgroup, provided the reset threshold, timeout, and temperature grade meet system requirements.