Diodes Incorporated APX803L20-40SA-7

Overview

APX803L20-40SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in battery-powered and low-power digital systems. It features a fixed 2.0V detection threshold (±1.5% accuracy), 1µA typical supply current, 220ms reset timeout, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range.

For engineers reviewing the APX803L20-40SA-7 datasheet, APX803L20-40SA-7 pinout, APX803L20-40SA-7 application, or APX803L20-40SA-7 equivalent, this device serves as a precision, ultra-low-quiescent-current reset supervisor for portable instrumentation, embedded controllers, and power-constrained microprocessor systems requiring reliable brown-out detection and controlled system restart timing.

Technical Context

The APX803L20-40SA-7 implements a comparator-based threshold detection architecture with built-in hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its internal reference and comparator circuitry are optimized for stability over temperature (50 ppm/°C threshold drift) and supply voltage variation (0.9–5.5V operating range).

Reset assertion occurs within 20µs of V_CC falling below 2.0V, and the active-low open-drain output remains asserted until V_CC exceeds 2.0V by ≥1.5% (i.e., ≥2.03V), then holds for the full 220ms timeout before releasing - ensuring robust power sequencing in µP-based systems.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB20DBZR and MAX809SEUR+T, the APX803L20-40SA-7 delivers optimal balance of ultra-low ICC (1µA), precise 220ms timing alignment with common µP boot windows, and industrial-grade temperature stability - making it ideal for next-generation portable and embedded systems where power efficiency and deterministic reset behavior are co-prioritized.

Availability

APX803L20-40SA-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 with consistent parametric performance across temperature and lot-to-lot production.

Supply support for APX803L20-40SA-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, computing, and consumer markets.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact reset timeout for APX803L20-40SA-7?

The APX803L20-40SA-7 provides a nominal 220ms reset active timeout period after V_CC recovers above the 2.0V threshold. Per datasheet DS38171 Rev. 3-2, the specified range is 143ms (min) to 297ms (max) across temperature and process variation, with typical behavior centered at 220ms at +25°C.

Can APX803L20-40SA-7 monitor a 3.3V supply?

Yes - the device monitors any supply between 0.9V and 5.5V, but its internal threshold is fixed at 2.0V. To supervise a 3.3V rail, connect V_CC directly to that rail; RESET will assert when the 3.3V supply drops below 2.0V, providing undervoltage protection appropriate for systems where 2.0V represents a critical failure point.

Is an external pull-up resistor required on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 4.7kΩ–10kΩ) to a valid logic-high voltage (e.g., same V_CC, or separate V_BAT) is mandatory to establish a defined HIGH state when not asserted. No internal pull-up exists.

Does APX803L20-40SA-7 support AEC-Q200 qualification?

No - APX803L20-40SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. For automotive-grade alternatives, Diodes offers the APX803L20-40SA-7's functionally identical AEC-Q200 variant under part number APX803L20Q-40SA-7 (with "Q" suffix), manufactured in IATF 16949-certified facilities.