Diodes Incorporated APX803L-48SA-7

Overview

APX803L-48SA-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 4.8V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 0ms reset timeout - enabling immediate system recovery upon power restoration.

For engineers reviewing the APX803L-48SA-7 datasheet, APX803L-48SA-7 pinout, APX803L-48SA-7 application, or APX803L-48SA-7 equivalent, key selection criteria include threshold voltage precision, ultra-low quiescent current, reset timing behavior, and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L-48SA-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 4.8V and holds it low until VCC exceeds 4.8V + hysteresis.

No external components are required: the device integrates all sensing, timing, and output drive circuitry. The 0ms delay variant provides instantaneous reset assertion, making it suitable for applications demanding minimal latency between undervoltage detection and system reset initiation.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, gull-wing leads. RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E48DBVR and MAX809SEUR+T, the APX803L-48SA-7 delivers the lowest typical supply current (1µA vs. ≥3.5µA), zero-delay reset for fastest fault response, and open-drain flexibility - making it optimal for space- and power-constrained µP supervision where immediate reset assertion is mandatory.

Availability

APX803L-48SA-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, industrial PLC I/O modules, wearable health sensor hubs, and automotive body control modules requiring stable component supply across production lifecycles.

Supply support for APX803L-48SA-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 devices, with design centers and manufacturing facilities across Asia, Europe, and the Americas.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in portable, industrial, and communications equipment where minimal quiescent current and guaranteed reset timing are essential.

FAQ

What is the exact detection threshold voltage of APX803L-48SA-7?

The APX803L-48SA-7 has a factory-trimmed detection threshold of 4.8V with ±1.5% accuracy over −40°C to +85°C. This value is fixed internally and cannot be adjusted externally. The hysteresis is 0.01×VTH (48mV), ensuring clean release above 4.848V after a drop below 4.8V.

Can APX803L-48SA-7 drive a microcontroller's nRST pin directly?

Yes - its open-drain active-low RESET output can interface directly with standard CMOS nRST inputs. A pull-up resistor (typically 10kΩ to VCC or AVDD) is required. The output sinks up to 20mA and maintains VOL ≤0.4V at 3.5mA sink current, meeting common µC reset input voltage thresholds.

Is APX803L-48SA-7 qualified for automotive applications?

No - APX803L-48SA-7 is not AEC-Q100 qualified. While it operates from −40°C to +85°C and meets industrial reliability standards, Diodes Incorporated explicitly states that automotive-grade variants require separate qualification (PPAP, IATF 16949 manufacturing, AEC-Q100 testing), and this part number is not listed in their automotive product definitions.

Does APX803L-48SA-7 require any external passive components?

No - the APX803L-48SA-7 requires no external resistors, capacitors, or diodes. Its internal voltage reference, comparator, and output driver are fully integrated. Only a 100nF bypass capacitor on VCC (as shown in the Typical Applications Circuit) is recommended for noise immunity, but not functionally required for basic operation.