Diodes Incorporated APX803L40-26SA-7

Overview

APX803L40-26SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and embedded digital systems. It features a fixed 2.6V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range - deployed in portable medical monitors requiring reliable power-up sequencing.

For engineers reviewing the APX803L40-26SA-7 datasheet, APX803L40-26SA-7 pinout, APX803L40-26SA-7 application, or APX803L40-26SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low quiescent current impact on battery life, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L40-26SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its internal comparator triggers an open-drain RESET signal when VCC falls below 2.6V and holds it active for exactly 450ms after recovery - verified across –40°C to +85°C per DS38171 Rev. 3–2.

No external components are required: the device integrates all timing and sensing circuitry. The 450ms delay is factory-programmed (not adjustable), and output sink capability supports ≥3.5mA at VOL ≤ 0.4V, enabling direct interface with µP reset inputs without pull-up resistor redesign.

Key Specifications

Pinout & Package

SOT23-3 package: ultra-compact surface-mount outline with gull-wing leads, JEDEC MO-178 compliant, 1.3mm max height, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E26DBVR and MAX809SEUR+T, the APX803L40-26SA-7 delivers superior thermal stability (50 ppm/°C), higher output drive strength, and longer factory-set reset duration - critical for robust boot sequencing in resource-constrained edge devices.

Availability

APX803L40-26SA-7 is available at Aetrix Electronics and suitable for portable medical monitors, smart home hubs, industrial data loggers, and wearable fitness trackers requiring stable component supply across multi-year production cycles.

Supply support for APX803L40-26SA-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in IATF 16949–certified facilities.

The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for low-power, high-accuracy voltage supervision in battery-operated and space-constrained embedded systems.

FAQ

What is the exact reset timeout duration for APX803L40-26SA-7?

The APX803L40-26SA-7 provides a factory-trimmed reset active timeout of 450ms (typical), with min/max values of 292ms and 608ms respectively, measured from VCC recovery to VTH + 0.02×VTH. This value is fixed and non-adjustable, confirmed in Electrical Characteristics Table (DS38171 Rev. 3–2, p.4).

Does APX803L40-26SA-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 host logic rail (e.g., 3.3V or 5V) is mandatory. Typical values range from 10kΩ to 100kΩ; Diodes recommends 47kΩ for optimal noise immunity and rise time in most µP interfaces.

Can APX803L40-26SA-7 operate with a 1.8V supply rail?

No - the APX803L40-26SA-7 requires VCC ≥ 0.9V to function, but its 2.6V detection threshold means it cannot supervise rails below 2.6V. For 1.8V systems, Diodes offers APX803L18-XXSA-7 (1.8V threshold variant), which shares identical package, current draw, and timing specs.

Is APX803L40-26SA-7 qualified for automotive applications?

No - APX803L40-26SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers the pin-compatible APX803L40-26SA-7Q variant (with "Q" suffix) for automotive use, manufactured in IATF 16949 facilities and tested to AEC-Q100 Grade 2 (–40°C to +105°C).