Diodes Incorporated APX803L-34SA-7

Overview

APX803L-34SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in embedded digital systems. It features a fixed 3.4V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms built-in recovery delay - enabling reliable power-up sequencing in battery-powered IoT sensors.

For engineers reviewing the APX803L-34SA-7 datasheet, APX803L-34SA-7 pinout, APX803L-34SA-7 application, or APX803L-34SA-7 equivalent, this device delivers precision reset assertion with minimal system power overhead, fast 20µs response to VCC drop, and compatibility with SOT23-3 footprint constraints in space-constrained designs.

Technical Context

The APX803L-34SA-7 implements a comparator-based threshold detection architecture with internal hysteresis (0.01×VTH) to prevent oscillation during slow-rising or noisy supply transitions. Its reset assertion is triggered when VCC falls below 3.4V and remains asserted until VCC exceeds 3.4V + hysteresis, ensuring clean release after brownout recovery.

It operates across –40°C to +85°C ambient, supports 0.9V–5.5V supply range, and uses no external components - relying on factory-trimmed internal reference and delay timing. The open-drain output allows wired-OR configuration with other reset sources and flexible pull-up voltage selection (up to 5.5V).

Key Specifications

Pinout & Package

SOT23-3 package (3-pin, 1.3mm × 2.9mm, 0.95mm height), 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 TPS3808G33DBVR and MAX809SEUR+T, the APX803L-34SA-7 offers superior ultra-low power (1µA), precise 3.4V threshold matching 3.3V rail + margin, and capacitor-free 450ms delay - making it optimal for long-life, space-constrained, and multi-source reset bus designs.

Availability

APX803L-34SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC modules, medical point-of-care devices, and automotive body control units requiring stable component supply with guaranteed long-term sourcing.

Supply support for APX803L-34SA-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 emphasis on power management, signal integrity, and protection devices.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy reset generation in battery-operated and industrial embedded systems where reliability and minimal current draw are critical.

FAQ

What is the exact detection threshold voltage for APX803L-34SA-7?

The APX803L-34SA-7 has a factory-set detection threshold of 3.4V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is trimmed during production and does not require external adjustment. Electrical Characteristics table in DS38171 Rev. 3–2 confirms VTH = 3.4V nominal, ∆VTH = ±1.5%.

Can APX803L-34SA-7 drive a 10kΩ pull-up resistor to 5V?

Yes - its open-drain RESET output supports sink currents up to 20mA and is rated for V_OL ≤ 0.4V at I_SINK = 3.5mA. With a 10kΩ pull-up to 5V, the output low voltage remains <0.1V (calculated: 3.5mA × 10kΩ = 35V drop - not applicable; actual load is ~0.5mA, well within spec), ensuring robust logic-low assertion.

Is APX803L-34SA-7 qualified for automotive use?

No - APX803L-34SA-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and consumer applications. See footnote on page 1 of DS38171.

Does the 450ms reset timeout vary with temperature or supply voltage?

The 450ms delay (APX803L40-XX variant) exhibits ±10% variation over –40°C to +125°C, per Figure 5 in DS38171 Rev. 3–2. It is independent of VCC within 0.9V–5.5V range. No voltage-dependent drift is specified; timing is generated by an internal RC oscillator trimmed at wafer test.