Diodes Incorporated APX803L40-46SR-7

Overview

APX803L40-46SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing 4.6V fixed threshold detection with ±1.5% accuracy, 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23R package - used to ensure reliable power-on reset in battery-powered IoT sensors and portable medical monitors.

For engineers reviewing the APX803L40-46SR-7 datasheet, APX803L40-46SR-7 pinout, APX803L40-46SR-7 application, or APX803L40-46SR-7 equivalent, this page delivers verified electrical specs, validated SOT23R pin mapping, real-world timing behavior (t_S = 20µs, t_DELAY = 450ms), thermal performance (θ_JA = 200°C/W), and direct alternative part comparisons for embedded power monitoring designs.

Technical Context

The APX803L40-46SR-7 implements a precision bandgap-based voltage reference with hysteresis (V_HYS = 0.01 × V_TH) to prevent oscillation during V_CC recovery. Its internal comparator continuously monitors V_CC against the factory-trimmed 4.6V threshold and asserts the open-drain RESET pin low when V_CC drops below V_TH – holding until V_CC exceeds V_{TH_H} = V_TH + V_HYS.

It integrates a temperature-compensated delay timer (±50 ppm/°C threshold drift) that guarantees 450ms minimum RESET assertion after V_CC fall, independent of external components. The device operates across -40°C to +85°C ambient with no external capacitor required for timing control.

Key Specifications

Pinout & Package

SOT23R (3-pin, 0.95mm pitch, 1.3mm × 2.9mm footprint) with gull-wing leads and exposed pad not connected internally. RoHS-compliant, halogen-free, lead-free construction per JEDEC MO-178AB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803E46DBVR and MAX809SEUR+T, the APX803L40-46SR-7 delivers the longest guaranteed reset timeout (450ms) at lowest quiescent current (1µA), making it optimal for energy-constrained systems requiring robust power sequencing without sacrificing battery life.

Availability

APX803L40-46SR-7 is available at Aetrix Electronics and suitable for smart wearable sensor nodes, industrial PLC I/O modules, portable medical pulse oximeters, and automotive cabin infotainment MCUs requiring stable component supply across long-lifecycle production programs.

Supply support for APX803L40-46SR-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 for power management, signal integrity, and connectivity applications.

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

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L40-46SR-7?

The APX803L40-46SR-7 has a factory-trimmed reset threshold of 4.6V with a guaranteed accuracy of ±1.5% over -40°C to +85°C ambient temperature. This corresponds to a min/max range of 4.531V to 4.669V at +25°C, and includes temperature-induced drift of ±50 ppm/°C across the full operating range.

Does APX803L40-46SR-7 require an external capacitor for timing?

No. The 450ms reset timeout is generated by an internal precision oscillator and timer circuit - no external capacitor or resistor is needed. This eliminates component variation, board space, and soldering reliability concerns associated with discrete RC timing networks.

Can APX803L40-46SR-7 drive a standard CMOS reset input directly?

Yes, but only with an external pull-up resistor. Its open-drain active-low RESET output requires a pull-up (typically 10kΩ to V_CC or another logic rail) to generate a valid high-level signal. It can sink up to 20mA, supporting direct interface to most µP reset pins rated for 3.3V or 5V logic levels.

Is APX803L40-46SR-7 qualified for automotive applications?

No - APX803L40-46SR-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803L40-46SRA) with PPAP capability, IATF 16949 manufacturing, and extended temperature screening. For automotive use, contact Diodes' automotive sales team for qualified alternatives.