Diodes Incorporated APX803L05-31SA-7

Overview

APX803L05-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.1 V threshold detection with ±1.5% accuracy, 1 µA typical supply current, and 55 ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered embedded systems.

For engineers reviewing the APX803L05-31SA-7 datasheet, APX803L05-31SA-7 pinout, APX803L05-31SA-7 application, or APX803L05-31SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay timing stability over temperature, low-quiescent-current impact on system power budget, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L05-31SA-7 integrates a precision bandgap reference and comparator with built-in hysteresis (0.01×V_TH) to prevent oscillation during V_CC recovery. Its internal fixed 3.1 V threshold is laser-trimmed during wafer test, eliminating external resistor networks.

Reset assertion occurs within 20 µs of V_CC falling below 3.1 V, and the open-drain output remains asserted until V_CC exceeds 3.1 V + hysteresis. The 55 ms timeout is factory-programmed and stable across –40°C to +85°C ambient.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236), 1.3 mm × 2.9 mm footprint, 1.45 mm height, gull-wing leads. RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA31DBZR, APX803L05-31SA-7 offers superior thermal stability (50 vs. 100 ppm/°C) but slower response; versus MAX809SEUR+T, it delivers 12× lower supply current and tighter threshold accuracy, making it preferable for battery longevity and precision reset timing.

Availability

APX803L05-31SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and automotive body control modules requiring stable component supply and long-term production continuity.

Supply support for APX803L05-31SA-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 devices, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q standards.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for low-power, high-accuracy power monitoring in space-constrained and battery-sensitive applications.

FAQ

What is the exact reset threshold voltage for APX803L05-31SA-7?

The APX803L05-31SA-7 has a factory-trimmed nominal reset threshold of 3.10 V, with guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C). This corresponds to a minimum threshold of 3.054 V and maximum of 3.146 V at +25°C, confirmed in Electrical Characteristics Table 1 of DS38171 Rev. 3-2.

Does APX803L05-31SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to the monitored V_CC or another logic rail is mandatory. Typical values range from 10 kΩ to 100 kΩ; Diodes' recommended value is 47 kΩ for 3.3 V systems, ensuring full logic-high level while limiting sink current to ≤3.5 mA during assertion.

Can APX803L05-31SA-7 operate with supply voltages below 3.1 V?

Yes - the device functions down to 0.9 V supply (per Recommended Operating Conditions), enabling detection of brownout events even as V_CC collapses. However, RESET remains asserted until V_CC rises above 3.1 V + hysteresis (~3.131 V), ensuring clean release after recovery.

Is APX803L05-31SA-7 qualified for automotive applications?

No - APX803L05-31SA-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803L05-31SA-7Q) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening; this part is rated for industrial use only (–40°C to +85°C ambient).