Diodes Incorporated APX803L-33W5-7

Overview

APX803L-33W5-7 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 3.3V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms reset timeout - enabling reliable power-on reset in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L-33W5-7 datasheet, APX803L-33W5-7 pinout, APX803L-33W5-7 application, or APX803L-33W5-7 equivalent, key selection criteria include threshold accuracy over temperature, ultra-low quiescent current, reset delay timing stability, and SOT25 package compatibility with high-density PCB layouts.

Technical Context

The APX803L-33W5-7 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 3.3V and holds it low until VCC exceeds the release threshold (3.3V + hysteresis).

It integrates a factory-programmed 220ms reset timeout (APX803L20 variant), operates from 0.9V to 5.5V supply, and delivers sub-20µs response time from VCC drop to RESET assertion - meeting strict timing requirements for ARM Cortex-M and RISC-V microcontroller boot sequencing.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with NC pins; compact 2.9mm × 1.6mm footprint optimized for space-constrained designs. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = GND, Pins 4–5 = NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E33DBVR and MAX809SEUR+T, the APX803L-33W5-7 uniquely balances ultra-low ICC (1µA), precise 3.3V detection (±1.5%), and SOT25 packaging - making it optimal for new designs prioritizing energy efficiency and layout flexibility without sacrificing timing reliability.

Availability

APX803L-33W5-7 is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, smart utility metering, and edge AI sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for APX803L-33W5-7 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 for power management, signal integrity, and connectivity applications.

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

FAQ

What is the exact reset threshold voltage and tolerance for APX803L-33W5-7?

The APX803L-33W5-7 has a nominal reset threshold of 3.3V with ±1.5% accuracy over temperature (−40°C to +85°C), verified per Electrical Characteristics table in DS38171 Rev. 3-2. This corresponds to a guaranteed detection range of 3.2505V to 3.3495V at +25°C, tightening to ±2.0% over full operating temperature.

Does APX803L-33W5-7 require external components for basic operation?

No external components are required for core supervision functionality. A 100nF ceramic decoupling capacitor on VCC is recommended per datasheet Figure 1, and an external pull-up resistor on the RESET pin is necessary due to its open-drain architecture - but no timing resistors, dividers, or compensation networks are needed.

Can APX803L-33W5-7 drive a 1.8V microcontroller reset input directly?

Yes - the open-drain RESET output allows connection to any logic rail via appropriate pull-up. For a 1.8V µP, use a pull-up to 1.8V; the output low voltage remains ≤0.4V at 3.5mA sink, ensuring valid logic-low assertion across voltage domains without level-shifting circuitry.

Is the 220ms reset timeout affected by temperature or supply voltage variation?

The 220ms timeout (APX803L20 variant) exhibits ±15% variation over −40°C to +85°C per Figure 5 in DS38171 Rev. 3-2, and is independent of VCC within 0.9V–5.5V. No significant drift occurs with supply voltage changes, making it robust for wide-input industrial power supplies.