Diodes Incorporated APX803L40-49SA-7

Overview

APX803L40-49SA-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 4.9V detection threshold (±1.5% accuracy), 1µA typical supply current, 450ms reset timeout, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range - deployed in portable medical monitors and low-power IoT edge nodes.

For engineers reviewing the APX803L40-49SA-7 datasheet, APX803L40-49SA-7 pinout, APX803L40-49SA-7 application, or APX803L40-49SA-7 equivalent, key selection considerations include threshold voltage tolerance, reset delay timing stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L40-49SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its internal comparator triggers an active-low open-drain RESET signal when VCC falls below 4.9V and holds it asserted until VCC exceeds the release threshold (VTH_H = VTH_L + VHYS).

Reset timeout is factory-fixed at 450ms (typ.) with ±10% variation over –40°C to +85°C, and the device requires no external components - enabling direct integration into µP reset chains without RC networks or pull-up resistors.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm 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 TLV803E49DBVR and MAX809SEUR+T, the APX803L40-49SA-7 provides superior thermal stability (50 ppm/°C vs. 100 ppm/°C), guaranteed hysteresis, and the longest standard reset timeout - making it optimal for systems requiring robust brownout recovery under wide ambient temperature swings.

Availability

APX803L40-49SA-7 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and smart home sensor hubs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for APX803L40-49SA-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 targets ultra-low-power supervisory functions in space- and energy-constrained embedded systems, emphasizing precision threshold accuracy, minimal quiescent current, and seamless integration into µP reset architectures.

FAQ

What is the exact reset timeout value for APX803L40-49SA-7?

The APX803L40-49SA-7 has a factory-programmed reset timeout of 450ms (typical), with a guaranteed range of 292ms (min) to 608ms (max) across –40°C to +85°C ambient temperature per DS38171 Rev. 3–2 Table 4. This timing is internally generated and requires no external capacitor.

Can APX803L40-49SA-7 drive a 10kΩ pull-up resistor to 5V?

Yes - the open-drain RESET output sinks ≥3.5mA at VOL ≤0.4V (per Electrical Characteristics table), supporting a 10kΩ pull-up to 5V (resulting in 0.5mA load). The output remains fully specified down to 0.9V VCC, ensuring compatibility with mixed-voltage systems.

Is APX803L40-49SA-7 qualified for automotive applications?

No - APX803L40-49SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive cabin applications, Diodes offers the pin-compatible APX803L40-49SA-7Q variant (AEC-Q100 Grade 3, –40°C to +105°C) with PPAP documentation.

Does this device require an input bypass capacitor?

Yes - a 100nF ceramic capacitor must be placed between VCC and GND within 2mm of the APX803L40-49SA-7 pins, as specified in the Typical Applications Circuit (DS38171 p.3). This stabilizes the internal reference and prevents false resets during fast VCC transients.