Diodes Incorporated APX803L40-24SA-7

Overview

APX803L40-24SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and embedded digital systems. It features a fixed 2.4V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range.

For engineers reviewing the APX803L40-24SA-7 datasheet, APX803L40-24SA-7 pinout, APX803L40-24SA-7 application, or APX803L40-24SA-7 equivalent, this device supports critical power-on reset sequencing, brown-out detection in portable instrumentation, and low-current supervision in IoT edge nodes where supply efficiency and timing predictability are essential.

Technical Context

The APX803L40-24SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its reset logic asserts an active-low open-drain signal when VCC drops below 2.4V and holds it until VCC rises above the release threshold (2.4V + hysteresis), with guaranteed 20µs response time.

It integrates a factory-programmed 450ms recovery delay (APX803L40 variant), eliminating external RC timing components. The device requires no external biasing or pull-up resistors beyond standard system-level pull-up on the RESET line, and draws only 1µA at nominal VCC, enabling use in always-on subsystems.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, 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 APX803L40-24SA-7, APX803L40-25SA-7 offers identical performance with different traceability coding, while TLV803EA24DBZR trades 450ms reliability margin for lower current-making the APX803L40-24SA-7 optimal for robust industrial boot sequencing.

Availability

APX803L40-24SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, smart home hub power management, industrial PLC I/O modules, and wearable fitness trackers requiring stable component supply across multi-year production cycles.

Supply support for APX803L40-24SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in battery-sensitive and space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage and tolerance for APX803L40-24SA-7?

The APX803L40-24SA-7 has a factory-trimmed detection threshold of 2.4V with ±1.5% accuracy over temperature (–40°C to +85°C), verified per Diodes DS38171 Rev. 3–2 Section 4.3. This corresponds to a guaranteed range of 2.364V to 2.436V at +25°C, and includes hysteresis of 0.01×VTH to prevent chatter during threshold transitions.

Does APX803L40-24SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 4.7kΩ to 10kΩ) to the monitored VCC or host logic rail is mandatory. Without it, the output cannot assert a valid high state during normal operation, and reset signaling will fail. The datasheet Figure 1 shows this configuration with a 10kΩ pull-up.

Can APX803L40-24SA-7 operate from a 1.2V supply rail?

No - the minimum operating VCC is 0.9V, but the 2.4V detection threshold requires the monitored rail to be ≥2.4V. It cannot supervise 1.2V rails. For sub-2V supervision, Diodes offers APX803L variants like APX803L12-XXSA-7 (1.2V threshold) or APX803L15-XXSA-7 (1.5V threshold), both in the same SOT23-3 package.

Is APX803L40-24SA-7 qualified for automotive applications?

No - APX803L40-24SA-7 is not AEC-Q100 qualified. Diodes explicitly states in the datasheet (page 1) that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing - none of which apply to this part. For automotive use, consult Diodes' APX809 or APX810 series, which offer AEC-Q100 Grade 2/3 options.