Diodes Incorporated APX811-26UG-7

Overview

APX811-26UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset, precision 2.63 V reset threshold, push-pull active-low RESET output, 200 ms power-on reset delay, and SOT143 package. It monitors V_CC in 2.5V/3.0V/3.3V/5.0V systems and asserts reset during brownout or manual trigger to ensure reliable µP initialization in industrial embedded controllers.

For engineers reviewing the APX811-26UG-7 datasheet, APX811-26UG-7 pinout, APX811-26UG-7 application, or APX811-26UG-7 equivalent, key selection factors include confirmed reset threshold accuracy (±0.03 V), guaranteed 240 ms minimum reset timeout over –40°C to +85°C, MR input compatibility with standard logic levels, and SOT143 footprint compatibility with space-constrained PCB layouts.

Technical Context

The APX811-26UG-7 implements a precision bandgap-based voltage reference and comparator to detect V_CC falling below 2.63 V, triggering an internal timer that holds RESET low for ≥240 ms after V_CC recovers above threshold. Its push-pull output drives CMOS inputs directly without external pull-up.

Manual reset is implemented via an active-low MR pin with 100 ns minimum pulse width support and full temperature specification. The device operates across 1.1–5.5 V supply range and draws only 30–40 µA typical supply current at 25°C, enabling use in battery-backed and low-power systems.

Key Specifications

Pinout & Package

SOT143 (4-pin, 2.9 mm × 1.3 mm, 0.95 mm height) - green molding compound, lead-free/RoHS-compliant, thermal resistance θ_JA = 240°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3T and TPS3808G12QDBVRQ1, the APX811-26UG-7 uniquely combines SOT143 compactness, guaranteed 240 ms minimum timeout, and integrated MR functionality without sacrificing low ICC or industrial temperature coverage.

Availability

APX811-26UG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and smart energy meters requiring stable component supply with full RoHS compliance and green packaging.

Supply support for APX811-26UG-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.

The APX811/812 series belongs to Diodes' microprocessor supervisor product line, engineered for deterministic power-monitoring in cost-sensitive industrial and portable systems where precision threshold, small footprint, and manual reset capability are essential.

FAQ

What is the exact reset threshold voltage for APX811-26UG-7, and how tightly is it specified?

The APX811-26UG-7 has a nominal reset threshold of 2.63 V, with a guaranteed tolerance of ±0.03 V (2.60 V to 2.66 V) at 25°C and full specification over –40°C to +85°C. This tight tolerance eliminates the "uncertainty zone" found in ±5% threshold devices, ensuring deterministic reset behavior during marginal supply conditions.

Does APX811-26UG-7 require an external pull-up resistor on the RESET pin?

No. The APX811-26UG-7 features a push-pull output stage that actively drives RESET low and high, eliminating the need for an external pull-up resistor. This reduces BOM count and improves noise immunity compared to open-drain supervisors, though a 100 kΩ pull-down is recommended if valid logic low is required down to V_CC = 0 V.

How does the manual reset (MR) pin behave during power-up or brownout?

The MR pin is active-low and asynchronous: pulling MR low forces RESET low immediately, regardless of V_CC level or reset timeout state. During brownout, MR remains functional down to V_CC = 1.1 V, and its 100 ns minimum pulse width supports both mechanical switch debouncing and fast GPIO assertion.

Can APX811-26UG-7 operate reliably at V_CC below 2.63 V?

Yes - the device operates from 1.1 V to 5.5 V and maintains functional MR input and RESET output down to V_CC = 1.1 V. Below 1.0 V, RESET becomes high-impedance; however, most µPs are non-operational below this voltage, making the open-circuit state acceptable unless a pull-down resistor is added for absolute validity.