Diodes Incorporated APX803S05-46SR-7

Overview

APX803S05-46SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 5.0V supply monitoring. It asserts an active-low RESET signal during power-up and brownout events, with a typical timeout of 50ms, guaranteed valid down to VCC = 1V, and precision 4.63V reset threshold (±0.07V). Used in portable and embedded systems requiring reliable power-on initialization.

For engineers reviewing the APX803S05-46SR-7 datasheet, APX803S05-46SR-7 pinout, APX803S05-46SR-7 application, or APX803S05-46SR-7 equivalent, key selection criteria include reset threshold accuracy (4.63V), timeout duration (50ms typ.), open-drain output compatibility, low 10µA supply current, and operation across –40°C to +85°C.

Technical Context

The APX803S05-46SR-7 implements a precision voltage comparator with hysteresis-free threshold detection at 4.63V, coupled to a monostable timer that guarantees ≥20ms and ≤70ms reset assertion after VCC rises above threshold. Its open-drain output enables wired-OR configuration and level-shifting across supply domains.

Designed for brownout immunity, it ignores fast VCC transients (dVCC/dt up to 100 V/µs) and maintains valid logic state (RESET low) for VCC ≥ 1V. The internal timer resets on every VCC dip below threshold, ensuring robust reset hold during supply instability.

Key Specifications

Pinout & Package

APX803S05-46SR-7 is housed in a RoHS-compliant SOT23-3 (SR package) with gull-wing leads, 2.9mm × 1.3mm footprint, and 0.95mm height. Thermal resistance θJA = 232°C/W supports operation in compact PCB layouts without heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with APX809S46-46SA-7 and MAX809SEUR+T, the APX803S05-46SR-7 uniquely combines open-drain flexibility, 50ms timing optimized for modern µP boot sequences, and ultra-low 10µA supply current-making it ideal for space-constrained, multi-rail, or battery-sensitive designs where reset consolidation or level translation is required.

Availability

APX803S05-46SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network edge routers, and automotive infotainment head units requiring stable component supply and long-term lifecycle support.

Supply support for APX803S05-46SR-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 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 APX803S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, space-constrained embedded systems requiring precise, low-power reset generation across common supply voltages (2.5V–5.0V).

FAQ

What is the exact reset threshold voltage and tolerance for APX803S05-46SR-7?

The APX803S05-46SR-7 has a nominal reset threshold of 4.63V, with a guaranteed range of 4.56V to 4.70V at +25°C. Over the full operating temperature range (–40°C to +85°C), the threshold exhibits a maximum drift of ±0.035V due to its 30 ppm/°C tempco, ensuring consistent trip points across environmental conditions.

Can APX803S05-46SR-7 drive multiple microcontroller reset inputs simultaneously?

Yes - its open-drain RESET output supports wired-OR connection to multiple µP reset pins using a single shared pull-up resistor. This allows consolidated reset supervision across heterogeneous voltage domains (e.g., 5V supervisor output pulled up to a 3.3V µP rail), provided sink current remains within 20mA absolute maximum rating.

How does the 50ms reset timeout behave during repeated brownout events?

Each time VCC falls below the 4.63V threshold, the internal timer resets to zero and forces RESET low immediately. The 50ms timeout begins anew only after VCC rises above threshold and stabilizes - preventing premature release during oscillating supply conditions and ensuring robust hold time per valid power recovery event.

Is APX803S05-46SR-7 compatible with bidirectional reset pins like those on the Motorola 68HC11?

Yes - the open-drain architecture allows direct connection to bidirectional µP reset pins. When the µP asserts reset (driving low), the APX803S's RESET pin floats; when the APX803S asserts reset, it pulls the shared node low. A single pull-up resistor suffices, enabling mutual reset control without additional logic or isolation components.