Diodes Incorporated APX803L-49W5-7

Overview

APX803L-49W5-7 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 4.9V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms built-in recovery delay. Used in battery-powered instrumentation and portable electronics requiring reliable power-on reset.

For engineers reviewing the APX803L-49W5-7 datasheet, APX803L-49W5-7 pinout, APX803L-49W5-7 application, or APX803L-49W5-7 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in Diodes Incorporated's DS38171 Rev. 3–2 specification.

Technical Context

The APX803L-49W5-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its comparator continuously monitors VCC against the factory-trimmed 4.9V threshold and asserts RESET low when VCC drops below that level.

RESET remains asserted until VCC rises above the release voltage (VTH + VHYS), then holds active for the full 450ms timeout period - independent of VCC recovery speed - ensuring stable microprocessor initialization in low-noise, low-power environments.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with NC pins optimized for layout flexibility and noise immunity; pin 4 and 5 are no-connect terminals and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L-49W5-7, the SA variant saves board space but offers no NC isolation benefit, while TLV803E49DBVR extends temperature capability and reduces current draw - making it suitable for thermally aggressive or energy-critical deployments where pin compatibility is not required.

Availability

APX803L-49W5-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart energy meters, and automotive BCM subsystems requiring stable component supply across long production lifecycles.

Supply support for APX803L-49W5-7 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 design centers across Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.

The APX803L series belongs to Diodes' precision power-supervision product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-constrained and noise-sensitive embedded systems.

FAQ

What is the exact detection threshold voltage for APX803L-49W5-7?

The APX803L-49W5-7 has a factory-trimmed detection threshold of 4.9V with guaranteed accuracy of ±1.5% over −40°C to +85°C ambient, per Diodes Incorporated DS38171 Rev. 3–2 Section 5.3. This value is fixed internally and not adjustable via external components.

Can APX803L-49W5-7 drive a 10kΩ pull-up resistor to 5V?

Yes - the open-drain RESET output can sink up to 20mA (absolute max), and typical VOL is ≤0.4V at 3.5mA sink current. With a 10kΩ pull-up to 5V, the resulting sink current is 0.5mA, well within specification and ensuring clean logic-low assertion.

Is the 450ms reset timeout affected by temperature or supply voltage?

No - the 450ms delay is internally generated and specified to remain within ±20% over −40°C to +85°C and 0.9V to 5.5V VCC, as confirmed in DS38171 Figure 5 and Table 3. It does not scale with temperature or input voltage.

Are pins 4 and 5 on the SOT25 package required to be grounded or left floating?

Pins 4 and 5 are designated NC (no connection) and contain no internal bond wires or circuitry. Diodes Incorporated documentation explicitly states they must remain unconnected - grounding them may introduce noise coupling or violate package thermal design rules.