Diodes Incorporated APX803L20-33SA-7

Overview

APX803L20-33SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.3V threshold detection with ±1.5% accuracy, 220ms reset timeout, and 1µA typical supply current in SOT23-3 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L20-33SA-7 datasheet, APX803L20-33SA-7 pinout, APX803L20-33SA-7 application, or APX803L20-33SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation under brownout conditions, and compatibility with 3.3V logic-level microcontrollers requiring reliable power-on reset sequencing.

Technical Context

The APX803L20-33SA-7 implements a fixed-threshold voltage detection architecture with internal hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its comparator-based sensing circuit operates across -40°C to +85°C ambient range with 50 ppm/°C threshold drift.

Reset assertion occurs within 20µs of V_CC falling below 3.3V, and release requires V_CC to exceed 3.3V by at least the hysteresis margin. The open-drain output supports external pull-up to any logic rail up to 5.5V and sinks ≥3.5mA at 0.4V_OL.

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm footprint), 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 TLV803E33DBZR and MAX809SEUR+T, the APX803L20-33SA-7 offers optimal balance of ultra-low 1µA supply current, guaranteed 220ms reset timeout, and explicit ±1.5% threshold accuracy across full industrial temperature range-making it preferred for long-life battery applications where precision timing and minimal power overhead are critical.

Availability

APX803L20-33SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC modules, and wireless sensor nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L20-33SA-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' micro-power supervisory IC product line, engineered specifically for battery-critical and space-constrained applications demanding precision voltage monitoring with minimal current draw.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L20-33SA-7?

The APX803L20-33SA-7 has a factory-trimmed reset threshold of 3.3V with a guaranteed tolerance of ±1.5% over the -40°C to +85°C operating temperature range, as specified in the Electrical Characteristics table of DS38171 Rev. 3–2. This corresponds to a min/max threshold of 3.2505V to 3.3495V at +25°C, with 50 ppm/°C temperature coefficient affecting drift across temperature.

Does APX803L20-33SA-7 require an external capacitor for reset timing?

No. The 220ms reset timeout is internally generated and does not rely on external RC components. The device uses an on-chip oscillator and counter to achieve precise delay timing, eliminating layout area, BOM cost, and tolerance sensitivity associated with external capacitors.

Can the RESET pin drive a 5V logic input directly?

Yes-the open-drain RESET pin supports output voltage up to 6.0V (absolute max) and is rated for 20mA sink current. When used with a 5V pull-up resistor, it reliably drives standard 5V TTL/CMOS inputs; VOL remains ≤0.4V at 3.5mA sink, ensuring solid logic-low recognition.

Is APX803L20-33SA-7 qualified for automotive applications?

No-APX803L20-33SA-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade variants require separate change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and commercial applications only, with operating temperature limited to -40°C to +85°C.