Diodes Incorporated APX803L40-46SA-7

Overview

APX803L40-46SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.6V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 450ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C ambient range in battery-powered instrumentation and portable electronics.

For engineers reviewing the APX803L40-46SA-7 datasheet, APX803L40-46SA-7 pinout, APX803L40-46SA-7 application, or APX803L40-46SA-7 equivalent, key selection criteria include fixed 4.6V detection level, 450ms recovery delay, SOT23-3 package compatibility, and low-quiescent-current supervision for power-sensitive embedded systems.

Technical Context

The APX803L40-46SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during threshold crossing. Its 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 that level.

Reset assertion persists until V_CC rises above the release voltage (V_{TH_H} = V_{TH_L} + V_HYS), followed by a fixed 450ms timeout before RESET deasserts. The device requires no external components and draws only 1µA at nominal conditions, enabling direct integration into always-on monitoring paths.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L40-46SA-7 uniquely combines exact 4.6V detection, industry-leading 1µA current, and configurable 450ms timeout in a cost-optimized SOT23-3 package-making it optimal for long-life 5V-system supervision where precision and ultra-low power are jointly critical.

Availability

APX803L40-46SA-7 is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, automotive telematics gateways, and smart consumer electronics requiring stable component supply across extended product lifecycles.

Supply support for APX803L40-46SA-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 ICs, with design and manufacturing facilities certified to IATF 16949 and ISO 9001 standards.

The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for ultra-low-power microprocessor supervision in space-constrained, battery-dependent applications.

FAQ

What is the exact detection threshold voltage for APX803L40-46SA-7?

The APX803L40-46SA-7 has a factory-trimmed detection threshold of 4.6V with ±1.5% accuracy over –40°C to +85°C. This value is fixed internally and cannot be adjusted externally. The release voltage is approximately 4.646V (4.6V + 46mV hysteresis), ensuring stable reset deassertion after recovery.

Does APX803L40-46SA-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 to the monitored or host logic supply (1.8V–5.5V) is mandatory. A 10kΩ resistor is typical; lower values improve noise immunity but increase static current. No pull-down or capacitor is needed unless system-specific timing adjustments are required.

Can APX803L40-46SA-7 operate from a 3.3V supply rail?

No - the APX803L40-46SA-7 requires V_CC ≥ 4.6V to assert valid supervision. Its minimum operating voltage is 0.9V, but detection only occurs relative to its 4.6V threshold. To supervise a 3.3V rail, use APX803L33-XXSA-7 (3.3V variant) instead; this part is strictly intended for 5V or higher nominal supplies.

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

The APX803L40-46SA-7 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., APX803L40-46SA-7Q) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening. For non-automotive industrial or consumer use, this standard version meets all specified electrical and environmental ratings.