Diodes Incorporated APX803L20-46C3-7

Overview

APX803L20-46C3-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in battery-powered and embedded systems. It features a fixed 4.6V 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 - deployed in portable instrumentation and low-power microcontroller power sequencing.

For engineers reviewing the APX803L20-46C3-7 datasheet, APX803L20-46C3-7 pinout, APX803L20-46C3-7 application, or APX803L20-46C3-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), ultra-low quiescent current, and SOT323 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-46C3-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its internal comparator triggers an active-low open-drain RESET signal when V_CC drops below 4.6V and holds it asserted until V_CC exceeds the release threshold (V_{TH_H} = V_{TH_L} + V_HYS).

It integrates a factory-programmed 220ms reset timeout (typ. 220ms, min 143ms, max 297ms at +25°C) with ±50ppm/°C threshold drift and supports no external components - enabling direct connection between V_CC, GND, and RESET net without pull-up resistors or timing capacitors.

Key Specifications

Pinout & Package

SOT323 (SC-70) 3-pin plastic package: compact 2.1mm × 2.0mm footprint with 0.65mm lead pitch, optimized for high-density PCBs and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E46DBVR and MAX809SEUR+T, the APX803L20-46C3-7 delivers superior threshold accuracy (±1.5% vs ±2.5%), lower ICC (1µA vs 12µA), and guaranteed hysteresis - making it optimal for precision battery monitoring where false resets must be minimized.

Availability

APX803L20-46C3-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply, long-lifecycle support, and RoHS3-compliant sourcing.

Supply support for APX803L20-46C3-7 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 targets ultra-low-power voltage supervision in space- and energy-constrained systems - engineered for battery longevity, industrial reliability, and seamless integration into µP-based embedded platforms.

FAQ

What is the exact detection threshold voltage of APX803L20-46C3-7?

The APX803L20-46C3-7 has a factory-set detection threshold of 4.6V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is trimmed during production and specified in the Electrical Characteristics table of DS38171 Rev. 3-2, page 4.

Does APX803L20-46C3-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to a logic-compatible voltage (e.g., 1.8V, 3.3V, or 5V) is mandatory for proper signal level translation and bus interfacing. Typical values range from 10kΩ to 100kΩ depending on rise-time and fan-out requirements.

Can APX803L20-46C3-7 operate from a 1.8V supply rail?

No - the minimum recommended V_CC is 0.9V, but the 4.6V detection threshold requires the monitored rail to reach at least 4.6V. It cannot supervise 1.8V rails; for such use cases, select APX803L18-XX variants with 1.8V thresholds.

Is APX803L20-46C3-7 qualified for automotive applications?

No - this variant is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade versions (e.g., APX803L20-46C3-7Q) with PPAP support and IATF 16949 manufacturing, but the standard C3-7 part is rated for industrial temperature range only.