Diodes Incorporated APX803L05-44SA-7

Overview

APX803L05-44SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.4 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 systems such as portable medical monitors and IoT edge nodes requiring ultra-low power consumption and reliable power-up sequencing.

For engineers reviewing the APX803L05-44SA-7 datasheet, APX803L05-44SA-7 pinout, APX803L05-44SA-7 application, or APX803L05-44SA-7 equivalent, this device supports critical power monitoring in space-constrained embedded designs where supply current <2.5 µA, threshold stability over -40°C to +85°C, and fast 20 µs reset assertion are mandatory selection criteria.

Technical Context

The APX803L05-44SA-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 core operates across 0.9 V to 5.5 V V_CC, enabling compatibility with 1.8 V, 3.3 V, and 5 V logic domains.

Reset assertion occurs within 20 µs when V_CC falls below 4.4 V, and release requires V_CC to exceed 4.4 V by at least the hysteresis margin. The 55 ms timeout is factory-programmed and temperature-stable, varying less than ±10% across -40°C to +85°C per datasheet Figure 5.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236), 1.3 mm × 2.9 mm × 1.0 mm body, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA44DBZR and MAX809SEUR+T, the APX803L05-44SA-7 offers optimal balance of timing compliance (55 ms), ultra-low current (1 µA), and thermal performance (200°C/W) in the smallest standard SOT23-3 footprint, making it preferred for new energy-sensitive designs.

Availability

APX803L05-44SA-7 is available at Aetrix Electronics and suitable for portable medical devices, smart home sensors, industrial PLC modules, and wearable health trackers requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L05-44SA-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 for automotive-grade reliability.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power microprocessor supervision in battery-critical and space-constrained applications.

FAQ

What is the exact reset threshold voltage for APX803L05-44SA-7?

The APX803L05-44SA-7 has a factory-trimmed detection threshold of 4.4 V with ±1.5% accuracy over temperature (-40°C to +85°C). This value is fixed internally and not adjustable; datasheet Table 3 confirms V_TH = 4.4 V (typical) and ∆V_TH = ±1.5% across operating conditions.

Can APX803L05-44SA-7 drive a 10 kΩ pull-up resistor directly?

Yes - the open-drain RESET output sinks up to 20 mA (absolute maximum) and maintains VOL ≤ 0.4 V at 3.5 mA sink current. With a 10 kΩ pull-up to 3.3 V, the output low voltage remains <0.1 V, well within TTL/CMOS logic thresholds for reliable reset signaling.

Is there a version with different reset timeout options in the same SOT23-3 package?

Yes - Diodes offers APX803L20-44SA-7 (220 ms timeout) and APX803L40-44SA-7 (450 ms timeout) in identical SOT23-3 packaging. All share the same 4.4 V threshold and pinout; only the timeout duration differs, selected at wafer sort via laser trimming.

Does APX803L05-44SA-7 require an input capacitor on VCC?

Yes - a 100 nF ceramic capacitor is recommended between V_CC and GND, placed as close as possible to the device pins. This stabilizes the internal reference and prevents false resets caused by high-frequency noise or transient supply droop, as shown in the Typical Applications Circuit on page 3 of DS38171 Rev. 3-2.