Analog Devices Inc./Maxim Integrated MAX6425UK16+TG103

Overview

MAX6425UK16+TG103 from Maxim Integrated is a low-power microprocessor supervisor IC with open-drain active-low reset output, 1.575V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and ensures reliable µP reset during brownout conditions.

For engineers reviewing the MAX6425UK16+TG103 datasheet, MAX6425UK16+TG103 pinout, MAX6425UK16+TG103 application, or MAX6425UK16+TG103 equivalent, key selection criteria include its SOT23-5 open-drain output architecture, 1.6µA typical quiescent current, ±2.5% reset threshold accuracy over –40°C to +125°C, and compatibility with external pullup voltages up to 5.5V.

Technical Context

This device implements a precision voltage-detection comparator with laser-trimmed internal reference and a 240nA current source driving an external capacitor on the SRT pin to generate a programmable reset timeout delay. The reset assertion logic is triggered when VCC falls below the factory-trimmed 1.575V threshold, and deassertion occurs only after the SRT capacitor ramps to 0.65V.

Its open-drain RESET output supports wired-OR configurations and logic-level translation across supplies from 0V to 5.5V, while immunity to short VCC transients (<50µs at 100mV overdrive) ensures robust operation in noisy power environments. All electrical specifications are guaranteed from –40°C to +125°C.

Key Specifications

Pinout & Package

MAX6425UK16+TG103 is housed in a 5-pin SOT23-5 package with exposed pad (G103 variant), optimized for thermal performance and board space efficiency in compact portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Compared with NCP302LSN16T1G and TLV809K33DBZR, MAX6425UK16+TG103 uniquely combines sub-2V brownout detection, capacitor-programmable timeout, and open-drain output in a 5-pin SOT23 - making it the only option supporting both low-voltage battery monitoring and flexible reset bus architecture.

Availability

MAX6425UK16+TG103 is available at Aetrix Electronics and suitable for battery-powered medical monitors, automotive body control modules, and industrial IoT sensor nodes requiring stable component supply with long-term lifecycle support.

Supply support for MAX6425UK16+TG103 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 demanding industrial, automotive, and medical applications.

The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for battery-constrained and thermally harsh environments - targeting applications where deterministic brownout response and minimal standby current are critical.

FAQ

What is the exact reset threshold voltage of MAX6425UK16+TG103?

The MAX6425UK16+TG103 features a factory-laser-trimmed nominal reset threshold of 1.575V, with guaranteed accuracy of ±2.5% over the full –40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix "16", and applies specifically to the MAX6425UK16+TG103 variant.

Does MAX6425UK16+TG103 support wired-OR reset functionality?

Yes, MAX6425UK16+TG103 supports wired-OR reset through its open-drain RESET output. An external pullup resistor connects to the target logic supply (0–5.5V), allowing multiple open-drain reset sources-including other MAX6425UK16+TG103 devices or auxiliary logic-to share a common reset bus without contention.

What capacitor value is required to achieve a 4.0ms reset timeout with MAX6425UK16+TG103?

To achieve a 4.0ms reset timeout, use CSRT = (4.0ms − 275µs) / 2.73×10⁶ = ~1370pF. A standard 1500pF ceramic capacitor yields 4.375ms (typical), which is within the specified tolerance. The formula tRP = 2.73×10⁶ × CSRT + 275µs applies directly to MAX6425UK16+TG103 per the datasheet's Pin Description section.

Can MAX6425UK16+TG103 operate reliably at VCC = 1.2V?

Yes, MAX6425UK16+TG103 guarantees valid RESET assertion and deassertion down to VCC = 1.0V. At 1.2V, its 1.575V reset threshold remains fully functional, and the 240nA SRT ramp current source maintains accuracy - enabling brownout detection during final stages of Li-ion battery discharge.

Is MAX6425UK16+TG103 pin-compatible with other devices in the MAX642x family?

MAX6425UK16+TG103 shares the same 5-pin SOT23-5 pinout with MAX6340, MAX6424, and MAX6426, and is explicitly documented as pin-compatible with NCP300–NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD series supervisors - enabling drop-in replacement in existing designs meeting those voltage and timing requirements.