Diodes Incorporated APX803L40-28SA-7

Overview

APX803L40-28SA-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 2.8V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23 package.

For engineers reviewing the APX803L40-28SA-7 datasheet, APX803L40-28SA-7 pinout, APX803L40-28SA-7 application, or APX803L40-28SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation in sleep-mode systems, and compatibility with 1.8V–5.5V logic interfaces.

Technical Context

The APX803L40-28SA-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 drops below 2.8V and holds it active for exactly 450ms after recovery-guaranteed across -40°C to +85°C ambient.

No external components are required: the device integrates all timing and sensing circuitry. The SOT23-3 package supports PCB space-constrained designs while maintaining thermal resistance of 200°C/W (Junction-to-Ambient), enabling reliable operation in portable equipment with limited airflow.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm × 1.1mm body, 0.95mm pitch), RoHS-compliant, lead-free, halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E28DBVR and MAX809SEUR+T, the APX803L40-28SA-7 delivers longer, factory-trimmed 450ms reset hold time and superior accuracy (±1.5% vs ±2.5%) while maintaining ultra-low 1µA supply current-making it optimal for next-generation portable and medical devices requiring deterministic power sequencing.

Availability

APX803L40-28SA-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, IoT sensor node supervision, industrial PLC I/O modules, and medical wearable boot integrity requiring stable component supply and long-term manufacturability.

Supply support for APX803L40-28SA-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, automotive, and consumer markets.

The APX803L series belongs to Diodes' micro-power supervisor product line, engineered specifically for battery-sensitive and space-constrained applications where precision threshold detection, minimal current draw, and guaranteed reset timing are critical.

FAQ

What is the exact reset timeout duration for APX803L40-28SA-7?

The APX803L40-28SA-7 provides a factory-programmed reset active timeout period of 450ms (typical), with guaranteed minimum 292ms and maximum 608ms across -40°C to +85°C ambient temperature. This delay begins when VCC rises above 1.02×2.8V and holds RESET low until expiration, independent of external components.

Can APX803L40-28SA-7 drive a 10kΩ pull-up to 3.3V?

Yes. The open-drain RESET output can sink ≥3.5mA at VOL ≤0.4V (tested at VCC = VTH – 0.2V), easily supporting standard 10kΩ pull-ups to 3.3V (I = 330µA). Output voltage drop remains under 0.4V even at elevated temperatures, ensuring clean logic-low signaling to µP reset inputs.

Is the 2.8V threshold calibrated at production?

Yes. The 2.8V detection threshold is laser-trimmed during wafer sort to achieve ±1.5% accuracy at +25°C, with temperature coefficient of 50ppm/°C. Full characterization data across -40°C to +85°C is provided in the DS38171 datasheet Figure 5 (RESET Threshold Voltage vs. Temperature).

Does APX803L40-28SA-7 require an input capacitor?

A 100nF ceramic decoupling capacitor is recommended between VCC and GND, placed as close as possible to the device pins. This stabilizes the internal reference during fast load transients and suppresses high-frequency noise that could affect threshold accuracy-per Diodes' Typical Applications Circuit on page 3 of DS38171 Rev. 3-2.