Diodes Incorporated APX803S05-23SR-7

Overview

APX803S05-23SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 2.25V supply monitoring in embedded digital systems. It asserts an active-low RESET signal during power-up, brownout, or VCC drop below 2.25V (±0.04V), maintains reset for 20–70ms after VCC recovers, and guarantees valid output down to VCC = 1V. Its 10µA typical supply current and −40°C to +85°C operation make it suitable for battery-powered controllers and portable instrumentation.

For engineers reviewing the APX803S05-23SR-7 datasheet, APX803S05-23SR-7 pinout, APX803S05-23SR-7 application, or APX803S05-23SR-7 equivalent, key selection criteria include reset threshold accuracy (2.21–2.30V), timeout period (50ms typ.), open-drain drive capability (1.2mA sink at 0.3V), guaranteed operation down to 1V VCC, and SOT23-SR package compatibility with space-constrained PCB layouts.

Technical Context

The APX803S05-23SR-7 implements a precision voltage comparator with 30ppm/°C tempco and internal timing circuitry to generate a fixed-duration active-low reset pulse. Its open-drain output requires an external pull-up resistor and interfaces directly with bidirectional µP reset pins without level-shifting circuitry.

It operates across full industrial temperature range (−40°C to +85°C) with supply voltage from 1.0V to 5.5V, draws only 10µA typical ICC, and ignores fast VCC transients via built-in noise immunity-ensuring reliable reset assertion during power supply glitches.

Key Specifications

Pinout & Package

APX803S05-23SR-7 is housed in a RoHS-compliant SOT23-3 (SR variant) package with gull-wing leads, 2.9mm × 1.3mm footprint, and 0.95mm height-optimized for high-density PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S05-23SR-7, APX809S23-23SRG-7 eliminates external component count but increases quiescent current slightly; MAX809SEUR+T shifts threshold upward and extends timeout, making it unsuitable for precise 2.25V brownout detection without system-level voltage scaling.

Availability

APX803S05-23SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX803S05-23SR-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 integrated circuits, specializing in high-reliability power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The APX803S series belongs to Diodes' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications requiring precision voltage monitoring and guaranteed low-VCC operation.

FAQ

What is the exact reset threshold voltage for APX803S05-23SR-7?

The APX803S05-23SR-7 has a guaranteed reset threshold of 2.21V minimum to 2.30V maximum at +25°C, with 2.25V nominal. This specification is fully characterized over −40°C to +85°C, exhibiting a tempco of 30ppm/°C, ensuring consistent trip point across operating temperatures without external trimming.

Can APX803S05-23SR-7 drive a reset line shared among multiple ICs?

Yes-the open-drain RESET output supports wired-OR configuration. Multiple APX803S05-23SR-7 units (or other open-drain reset supervisors) can share one reset bus with a single pull-up resistor. Total sink current must remain ≤20mA, and cumulative capacitance should stay below 100pF to maintain specified rise/fall times.

Does APX803S05-23SR-7 require an external capacitor for timing?

No-timing is fully internal. The 50ms typical reset timeout is generated by an on-chip oscillator and timer circuit; no external RC network is needed. This eliminates component variation, temperature drift, and PCB area associated with discrete timing elements.

How does APX803S05-23SR-7 behave when VCC falls below 1V?

Below 1V, the RESET output ceases sinking current and transitions to high-impedance state. This is intentional: since most µPs are nonfunctional below 1V, the open-circuit condition avoids false resets or contention. System design must ensure pull-up resistor maintains valid logic-high state during this phase.