Diodes Incorporated APX823-44W5G-7

Overview

APX823-44W5G-7 from Diodes Incorporated is a fixed-threshold processor supervisory circuit with active-low reset output, 4.38 V negative-going voltage detection (V_TH-), 200 ms typical reset delay (t_d), watchdog timer timeout of 1.6 s (typ.), and manual reset input (MR). It operates across -40°C to +85°C and is housed in a RoHS-compliant SOT25 package for power-on initialization and fault recovery in microcontroller-based embedded systems.

For engineers reviewing the APX823-44W5G-7 datasheet, APX823-44W5G-7 pinout, APX823-44W5G-7 application, or APX823-44W5G-7 equivalent, this page delivers verified electrical parameters, validated SOT25 pin mapping, confirmed watchdog timing behavior, and real-world use cases in industrial control and portable electronics - all derived from Diodes' official DS31323 Rev. 5-2 datasheet.

Technical Context

The APX823-44W5G-7 integrates a precision voltage comparator with 50 mV hysteresis, a 200 ms internal reset delay timer, and a watchdog circuit triggered by WDI transitions. Its MR input enables external system-initiated reset with 60 kΩ internal pull-up and 100 ns minimum pulse width requirement.

It monitors V_CC from 1.1 V to 5.5 V, asserts RESET low when V_CC falls below 4.38 V (V_TH-, typ. at 25°C), and maintains reset until V_CC rises above V_TH- + hysteresis. Supply current remains stable at 30 μA (typ.) across temperature and supply voltage.

Key Specifications

Pinout & Package

SOT25 package: 5-pin, lead-free, RoHS-compliant, moisture sensitivity level 3 per J-STD-020. Dimensions: 2.80 mm × 2.90 mm × 1.10 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX824-44W5G-7, the APX823-44W5G-7 offers direct compatibility with active-low reset architectures without external inverters; versus MAX809SEUR+T, it adds critical system-level reliability features - MR and watchdog - at minimal PCB area cost.

Availability

APX823-44W5G-7 is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and smart metering applications requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned manufacturing rigor.

Supply support for APX823-44W5G-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 solutions, with design centers in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.

The APX823/APX824/APX825A family targets high-reliability embedded systems needing integrated power-on reset, voltage monitoring, and watchdog functionality - designed specifically for DSP, MCU, and MPU platforms in industrial and computing applications.

FAQ

What is the exact V_TH- value for APX823-44W5G-7 and how is it specified across temperature?

The APX823-44W5G-7 has a nominal V_TH- of 4.38 V at 25°C, with min/max values of 4.31 V and 4.47 V over -40°C to +85°C ambient. This is confirmed in Table 1 of DS31323 Rev. 5-2, under "-44" variant row, with hysteresis of 50 mV. The threshold exhibits ±50 ppm/°C drift, resulting in ≤±25 mV total variation across full temperature range.

Can the watchdog timer be disabled, and what happens to WDI if left unconnected?

Yes - leaving the WDI pin unconnected disables the watchdog function entirely, as stated in the datasheet: "Leaving WDI unconnected disables the watchdog." No pull-up or pull-down is required; the pin floats internally and does not affect RESET behavior. WDI draws only 120 μA (max) when actively driven, and leakage is negligible when idle.

Is the RESET output open-drain or push-pull, and what drive strength is guaranteed?

The RESET output is open-drain. Per Electrical Characteristics table, it guarantees VOL ≤ 0.4 V at I_OL = 1 mA (V_CC = V_TH- − 0.2 V), confirming robust sinking capability. An external pull-up resistor (typically 10 kΩ to V_CC) is required to generate valid logic-high levels for MCU reset inputs.

Does APX823-44W5G-7 support automotive qualification, and what is its moisture sensitivity level?

No - APX823-44W5G-7 is rated for industrial temperature (-40°C to +85°C) and is not AEC-Q100 qualified. Its moisture sensitivity level is MSL3 per J-STD-020, requiring bake or dry-pack handling if exposed beyond floor life. Automotive-grade variants (e.g., APX823-44W5G-7Q) would carry separate part numbering and qualification documentation.