Diodes Incorporated APX803L40-31SA-7

Overview

APX803L40-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing 4.0 V fixed threshold detection with ±1.5% accuracy, 450 ms reset timeout, 1 µA typical supply current, and open-drain active-low RESET output in SOT23 package-used in battery-powered IoT sensors and portable medical devices to ensure reliable power-on reset sequencing.

For engineers reviewing the APX803L40-31SA-7 datasheet, APX803L40-31SA-7 pinout, APX803L40-31SA-7 application, or APX803L40-31SA-7 equivalent, this page delivers verified electrical parameters, validated SOT23 pin mapping, confirmed reset timing behavior across temperature, and real-world µP monitoring use cases-not generic timing references.

Technical Context

The APX803L40-31SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its internal comparator continuously monitors V_CC against the factory-trimmed 4.0 V threshold and asserts RESET low within 20 µs when V_CC drops below V_TH – L.

Reset deassertion requires V_CC to exceed V_TH + hysteresis (≈4.04 V), followed by a fixed 450 ms timeout before release-ensuring stable post-reset operation in microcontroller boot sequences. No external capacitor or resistor is needed for timing or biasing.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3 mm × 2.9 mm × 1.0 mm body, gull-wing leads, RoHS-compliant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E40DBZR and MAX809SEUR+T, the APX803L40-31SA-7 delivers superior energy efficiency (1 µA vs. ≥2.7 µA), longer reset hold (450 ms vs. ≤240 ms), and tighter threshold accuracy (±1.5% vs. ±2.5%), making it optimal for battery-sensitive, high-reliability embedded systems.

Availability

APX803L40-31SA-7 is available at Aetrix Electronics and suitable for smart wearable sensors, industrial PLC I/O modules, and medical infusion pumps requiring stable component supply with consistent parametric performance across production lots.

Supply support for APX803L40-31SA-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 solutions, with design centers in Asia, Europe, and the U.S., serving industrial, computing, consumer, and automotive markets.

The APX803L series targets ultra-low-power microprocessor supervision in space- and energy-constrained applications-designed specifically for battery-operated edge devices needing precise, self-contained reset control without external timing components.

FAQ

What is the exact reset timeout value for APX803L40-31SA-7?

The APX803L40-31SA-7 has a nominal reset active timeout period of 450 ms at +25°C, with guaranteed minimum 292 ms and maximum 608 ms across -40°C to +125°C per DS38171 Rev. 3-2 Table 3. This fixed delay is factory-programmed and requires no external capacitor.

Can APX803L40-31SA-7 monitor a 5 V supply directly?

Yes-the device operates with V_CC up to 5.5 V and features a 4.0 V detection threshold, making it suitable for direct monitoring of 5 V rails. Its absolute maximum V_CC rating is 6.0 V, and it maintains ±1.5% threshold accuracy across the full operating range.

Is a pull-up resistor required on the RESET pin?

Yes-an external pull-up resistor (typically 4.7 kΩ to 10 kΩ) to V_CC or another logic rail is mandatory because the RESET pin is open-drain. Without it, the output cannot achieve a valid high logic level, preventing proper reset signaling to the microcontroller.

Does APX803L40-31SA-7 include hysteresis, and what is its value?

Yes-it integrates built-in hysteresis of 0.01×V_TH (40 mV at 4.0 V), specified as ∆V_TH in the Electrical Characteristics table. This prevents chatter during slow-rising/falling supply transitions and is inherent to the internal comparator design-no external components needed.