Diodes Incorporated APX823-26W5G-7

Overview

APX823-26W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with 2.63 V reset threshold, 200 ms reset delay, watchdog timer, and manual reset input in SOT25 package. It monitors VCC for power-on and brownout conditions in microcontroller-based systems, asserts active-low RESET until VCC exceeds VTH− and the internal timer expires, and supports system recovery via MR pin. Used in industrial programmable controllers requiring reliable cold-start and fault recovery.

For engineers reviewing the APX823-26W5G-7 datasheet, APX823-26W5G-7 pinout, APX823-26W5G-7 application, or APX823-26W5G-7 equivalent, key selection criteria include confirmed 2.63 V threshold accuracy over −40°C to +85°C, 1.6 s watchdog timeout, 30 μA supply current, and SOT25 pin compatibility with MR/WDI/RESET/GND/VCC routing constraints.

Technical Context

The APX823-26W5G-7 implements a precision bandgap-based voltage reference to generate a stable 2.63 V (±30 mV) negative-going threshold with 50 mV hysteresis, ensuring immunity to supply noise during VCC transitions. Its internal RC timer provides a guaranteed 140–280 ms reset assertion period after VCC rises above VTH−.

Watchdog supervision operates on edge-triggered WDI input with 1.12–2.4 s timeout window; unconnected WDI disables watchdog functionality. Manual reset via MR pin forces immediate active-low RESET assertion independent of VCC level, with internal 60 kΩ pull-up enabling open-drain compatibility.

Key Specifications

Pinout & Package

SOT25 package: 5-pin, small-outline transistor outline with gull-wing leads, 1.6 mm × 2.8 mm body, 0.95 mm pitch, and 161°C/W junction-to-ambient thermal resistance under standard FR-4 mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX824-26W5G-7, the APX823-26W5G-7 provides essential manual reset capability at the cost of active-low output polarity; versus TPS3808G125DBVR, it trades adjustability and lower ICC for fixed-threshold simplicity and SOT25 footprint compatibility in cost-sensitive industrial designs.

Availability

APX823-26W5G-7 is available at Aetrix Electronics and suitable for industrial programmable controllers, portable data loggers, wireless communication modules, and notebook embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX823-26W5G-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The APX823 family belongs to Diodes' processor supervisory product line, engineered specifically for deterministic power-on initialization and fault recovery in resource-constrained embedded systems operating across industrial temperature grades.

FAQ

What is the exact reset threshold voltage and tolerance for APX823-26W5G-7?

The APX823-26W5G-7 has a nominal negative-going reset threshold of 2.63 V, with a guaranteed range of 2.59 V to 2.69 V at TA = 0°C and 2.51 V to 2.74 V at TA = −40°C to +85°C per DS31323 Rev. 5-2. This fixed threshold is set by an internal precision voltage divider and does not require external components.

Does APX823-26W5G-7 require external capacitors for stable operation?

Yes - a 0.1 μF ceramic capacitor must be placed between VCC and GND as close as possible to the device pins to stabilize the internal reference and suppress supply noise. No external timing capacitors are needed for reset delay or watchdog functions, as both are implemented with internal RC networks.

Can the watchdog timer be disabled without modifying the PCB layout?

Yes - leaving the WDI pin unconnected (floating) automatically disables the watchdog function while retaining full power-on and brownout reset capability. The device will operate solely as a voltage supervisor with manual reset support, requiring no solder jumpers or configuration resistors.

What is the maximum sink current capability of the RESET output?

The RESET output can sink up to 3 mA while maintaining VOL ≤ 0.4 V at VCC = VTH− − 0.2 V, per electrical characteristics table in DS31323. This supports direct interface with most microcontrollers' reset inputs using standard 10 kΩ pull-up resistors without additional buffering.