Diodes Incorporated APX803L-15W5-7

Overview

APX803L-15W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in embedded digital systems. It features a fixed 1.5V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms reset timeout - enabling reliable power-up sequencing in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L-15W5-7 datasheet, APX803L-15W5-7 pinout, APX803L-15W5-7 application, or APX803L-15W5-7 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in Diodes' DS38171 Rev. 3–2 specification.

Technical Context

The APX803L-15W5-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its internal comparator triggers an open-drain RESET signal when VCC drops below 1.5V and holds it low until VCC exceeds 1.5075V (1.5V + 1.5% hysteresis margin).

This variant uses the SOT25 package with 5 pins (VCC, RESET, GND, NC, NC), where the two no-connect pins enable mechanical stability without functional impact. The 220ms delay (suffix "20") is factory-programmed and temperature-stable across –40°C to +85°C operating range.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with 1.6mm × 2.9mm footprint, 1.1mm height, and gull-wing leads. Pin 4 and Pin 5 are no-connect (NC) terminals - not internally bonded and must remain unconnected in PCB layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L-15SA-7, the W5 variant offers enhanced mechanical stability via NC pins and identical electrical performance; versus TLV803E15DBVR, it delivers 2.5× lower supply current and factory-trimmed 220ms timing - eliminating design-in uncertainty and calibration overhead.

Availability

APX803L-15W5-7 is available at Aetrix Electronics and suitable for smart wearable sensors, industrial PLC I/O modules, wireless edge node gateways, and portable diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for APX803L-15W5-7 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-harvesting systems, emphasizing precision threshold accuracy, minimal ICC, and robust reset timing across automotive-grade temperature ranges.

FAQ

What is the function of Pins 4 and 5 on the APX803L-15W5-7 SOT25 package?

Pins 4 and 5 are no-connect (NC) terminals with no internal bonding. They serve mechanical reinforcement only and must remain unconnected in PCB layout. Neither pin may be tied to VCC, GND, or any signal - doing so violates the absolute maximum ratings and risks latch-up or parametric shift.

Can the APX803L-15W5-7 be used with a 1.2V supply rail?

No - the minimum recommended operating voltage is 0.9V, but the 1.5V detection threshold requires VCC ≥ 1.5V to assert valid reset behavior. At 1.2V, the internal reference cannot stabilize, and RESET remains indeterminate. Use APX803L-12 variants for 1.2V rails.

How does the 220ms reset timeout behave during temperature variation?

The 220ms delay is factory-trimmed and exhibits <±5% variation over –40°C to +85°C, as confirmed by Figure 5 in DS38171 Rev. 3–2. No external components affect this timing; it remains stable regardless of VCC ripple or load transients within spec.

Is a decoupling capacitor required for APX803L-15W5-7, and what value is recommended?

Yes - a 100nF ceramic capacitor must be placed between VCC (Pin 3) and GND (Pin 1), with lead length <1mm. This suppresses high-frequency noise coupling into the reference circuit and prevents false reset triggering during digital switching events on adjacent traces.