Diodes Incorporated APX803L05-28SA-7

Overview

APX803L05-28SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.8V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 55ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C ambient range in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L05-28SA-7 datasheet, APX803L05-28SA-7 pinout, APX803L05-28SA-7 application, or APX803L05-28SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current impact on battery life, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L05-28SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during power-up/power-down transitions. Its comparator continuously monitors V_CC against the fixed 2.8V threshold and asserts RESET when V_CC drops below V_TH–100mV within 20µs.

Reset assertion remains active until V_CC rises above V_TH + hysteresis, followed by a factory-programmed 55ms timeout before deassertion. The open-drain output supports pull-up to any voltage ≤5.5V and sinks up to 20mA, enabling direct interface with µP reset inputs without external logic.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant. Thermal resistance θ_JA = 200°C/W enables operation at full rated current without heatsinking in standard FR-4 PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01QDBVRQ1 and MAX809SEUR+T, the APX803L05-28SA-7 delivers superior power efficiency (1µA vs. 12–20µA) and tighter threshold accuracy (±1.5% vs. ±2.5%), making it optimal for battery longevity and precise brown-out response in portable and industrial edge nodes.

Availability

APX803L05-28SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, industrial PLC I/O modules, smart home hubs, and automotive telematics units requiring stable component supply across extended production lifecycles.

Supply support for APX803L05-28SA-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 manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200 standards.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-sensitive systems, emphasizing minimal IQ, tight threshold accuracy, and robust temperature performance for mission-critical reset control.

FAQ

What is the exact reset threshold voltage for APX803L05-28SA-7?

The APX803L05-28SA-7 has a factory-set threshold of 2.8V with ±1.5% accuracy at +25°C, translating to a guaranteed range of 2.758V to 2.842V. This value is trimmed during production and remains stable across temperature due to its bandgap reference architecture and 50ppm/°C drift coefficient.

Can APX803L05-28SA-7 be used with a 5V supply rail?

Yes - the device supports V_CC from 0.9V to 5.5V and monitors that same rail. When used on a 5V system, it will assert RESET if the 5V rail drops below 2.8V, making it suitable for dual-voltage systems where 5V powers analog sections and 3.3V or lower powers digital logic.

Does the 55ms reset timeout vary with temperature or supply voltage?

No - the 55ms timeout is internally generated and specified as 35ms (min) to 75ms (max) across –40°C to +85°C and 0.9V–5.5V V_CC. Data sheet Figure 5 confirms monotonic stability with no significant deviation outside this window, ensuring predictable system boot behavior.

Is an external pull-up resistor required on the RESET pin?

Yes - the open-drain RESET output requires an external pull-up resistor to a valid logic-high voltage (≤5.5V). A 10kΩ resistor to 3.3V is typical; value selection balances rise time (lower R) against current draw (higher R), with 4.7kΩ–100kΩ being acceptable per application requirements.