Diodes Incorporated APX803L-37SA-7

Overview

APX803L-37SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in embedded digital systems. It features a fixed 3.7V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms built-in recovery delay. Used in battery-powered instrumentation and portable electronics requiring low-burden power monitoring.

For engineers reviewing the APX803L-37SA-7 datasheet, APX803L-37SA-7 pinout, APX803L-37SA-7 application, or APX803L-37SA-7 equivalent, key selection considerations include threshold voltage tolerance, reset timeout stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L-37SA-7 implements a precision bandgap-based voltage reference and comparator circuit to detect when VCC falls below 3.7V, triggering an active-low open-drain RESET signal within 20µs. Its internal hysteresis (0.01×VTH) prevents chatter during slow-rising or noisy supply transitions.

It integrates a programmable recovery delay timer (220ms nominal) that holds RESET low until VCC exceeds 3.7V + hysteresis and remains stable for the full timeout period. No external components are required - operation is fully self-contained in the SOT23-3 package.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm × 1.0mm 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 APX803L-37SA-7, APX803L20-37SA-7 offers identical electrical behavior with explicit delay coding, while TLV803E37DBZR trades 0.5% tighter threshold accuracy and lower current for reduced delay granularity - making it suitable only where 20ms timing margin exists.

Availability

APX803L-37SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and wearable fitness trackers requiring stable component supply with guaranteed long-term sourcing.

Supply support for APX803L-37SA-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, manufacturing, and distribution infrastructure serving industrial, computing, consumer, and automotive markets.

The APX803L series belongs to Diodes' precision power-supervision 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 threshold voltage for APX803L-37SA-7?

The APX803L-37SA-7 has a factory-trimmed detection threshold of 3.7V with ±1.5% accuracy at +25°C. Over the full operating temperature range (–40°C to +85°C), total error remains within ±2.2% due to its 50 ppm/°C temperature coefficient, as confirmed in Electrical Characteristics Table 1 of DS38171 Rev. 3–2.

Does APX803L-37SA-7 include a built-in reset delay?

Yes - APX803L-37SA-7 incorporates a 220ms nominal recovery delay (tDELAY), meaning the RESET pin remains low for 220ms after VCC rises above the 3.7V threshold. This value is fixed internally and matches the "20" delay code variant (APX803L20-XX), verified in the Ordering Information and Timing Diagram sections of the datasheet.

Can APX803L-37SA-7 drive a 10kΩ pull-up directly?

Yes - the open-drain RESET output can sink up to 3.5mA while maintaining VOL ≤ 0.4V (at VCC = VTH – 0.2V). With a 10kΩ pull-up to 3.3V, the resulting sink current is 0.33mA, well within specification and ensuring robust logic-low assertion across temperature and process variation.

Is APX803L-37SA-7 qualified for automotive use?

No - APX803L-37SA-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and consumer applications, as noted in the "For automotive applications…" footnote on page 1 of DS38171.