Diodes Incorporated APX803L05-21SA-7

Overview

APX803L05-21SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 5.0 V threshold detection with ±1.5% accuracy, 1 µA typical supply current, and 55 ms reset timeout. It delivers active-low open-drain reset signaling in battery-powered IoT sensors, portable medical devices, and low-power microcontroller systems requiring reliable power-up sequencing.

For engineers reviewing the APX803L05-21SA-7 datasheet, APX803L05-21SA-7 pinout, APX803L05-21SA-7 application, or APX803L05-21SA-7 equivalent, this page details its fixed-threshold supervision function, SOT23-3 package layout, timing behavior across temperature, and direct substitution options for 5 V system reset management.

Technical Context

The APX803L05-21SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent chatter during brown-out recovery. Its internal comparator continuously monitors V_CC against a factory-trimmed 5.0 V threshold and asserts RESET when V_CC drops below that level.

Reset assertion remains active for a guaranteed 55 ms after V_CC rises above the release threshold (V_{TH_H} = V_{TH_L} + hysteresis), ensuring stable processor initialization. The open-drain output supports wired-OR configurations and external pull-up flexibility up to 5.5 V.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3 mm × 2.9 mm × 1.0 mm body, gull-wing leads, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA50DBZR and MAX809SEUR+T, the APX803L05-21SA-7 uniquely balances 55 ms timing margin with 1 µA consumption-ideal for cost-sensitive, long-life 5 V embedded systems where neither extreme low current nor extended timeout is required.

Availability

APX803L05-21SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLC modules, and medical infusion pumps requiring stable component supply with full traceability and lifecycle continuity.

Supply support for APX803L05-21SA-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 low-power, high-accuracy power monitoring in space-constrained portable and industrial electronics.

FAQ

What is the exact reset threshold voltage for APX803L05-21SA-7?

The APX803L05-21SA-7 has a nominal reset threshold of 5.0 V with ±1.5% accuracy over temperature (−40°C to +85°C). At +25°C, the actual threshold falls between 4.925 V and 5.075 V, and the hysteresis is 0.01×V_TH, ensuring stable release above the falling threshold.

Can APX803L05-21SA-7 operate with a 3.3 V supply rail?

Yes - the device operates from 0.9 V to 5.5 V, but its 5.0 V threshold is fixed and independent of supply voltage. When monitoring a 3.3 V rail, it will assert reset whenever that rail drops below 5.0 V, which is impossible; thus, it is only suitable for monitoring rails ≥5.0 V or used with external resistor dividers (not recommended per datasheet).

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

Yes - the RESET pin is open-drain and requires an external pull-up resistor to a valid logic rail (e.g., 3.3 V or 5 V). Typical values range from 4.7 kΩ to 10 kΩ; lower values improve noise immunity but increase static current, while higher values risk slow rise times in noisy environments.

Does APX803L05-21SA-7 support AEC-Q200 qualification?

No - the APX803L05-21SA-7 is not AEC-Q200 qualified. Diodes offers automotive-grade alternatives (e.g., APX803L05-21W5-7 in SOT25) with PPAP capability and IATF 16949 manufacturing, but this SOT23-3 variant is intended for industrial and commercial applications only.