Diodes Incorporated APX803S00-23SA-7

Overview

APX803S00-23SA-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with open-drain active-low RESET output, 2.25 V ±0.04 V precision reset threshold, 1.7 ms typical reset timeout, 10 µA supply current, and guaranteed operation down to VCC = 1 V. It monitors 2.5 V–5.0 V power rails in embedded microcontroller systems requiring reliable brownout detection and power-on reset assertion.

For engineers reviewing the APX803S00-23SA-7 datasheet, APX803S00-23SA-7 pinout, APX803S00-23SA-7 application, or APX803S00-23SA-7 equivalent, this page delivers verified electrical parameters, SOT23-SA package terminal mapping, timing-critical design values, and validated alternatives for µP reset circuitry in portable and industrial control systems.

Technical Context

The APX803S00-23SA-7 implements a precision voltage comparator with internal hysteresis and a fixed-duration monostable timer. Its reset assertion logic triggers when VCC falls below 2.25 V and holds RESET low for ≥1 ms after VCC rises above threshold - independent of supply ramp rate up to 100 V/µs.

Designed for direct interface with bidirectional µP reset pins, the open-drain output supports pull-up to any compatible voltage rail (≤5.5 V), enabling level-shifting across mixed-supply systems. The device guarantees valid reset state down to VCC = 1 V, with leakage <1 µA on RESET when deasserted.

Key Specifications

Pinout & Package

SOT23-3 (SA package) surface-mount plastic package with 2.4 mm × 1.3 mm footprint, 0.915 mm height, and gull-wing leads. RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S00-23SA-7, the APX809S23-23SA-7 simplifies BOM count but sacrifices voltage translation flexibility, while the MAX809TRD3T trades lower quiescent current and shorter timeout for broader industry familiarity and longer reset assertion - making it preferable in cost-sensitive, non-battery applications.

Availability

APX803S00-23SA-7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensors, automotive body control units, and smart home hub gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for APX803S00-23SA-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' supervisory IC product line, engineered specifically for deterministic power-on reset and brownout recovery in resource-constrained embedded systems - prioritizing low ICC, wide VCC range, and precise threshold accuracy.

FAQ

What is the minimum VCC required for APX803S00-23SA-7 to assert a valid RESET signal?

The device guarantees RESET remains a valid logic-low output for VCC ≥ 1.0 V. Below 1.0 V, the output enters high-impedance state and cannot sink current - but this aligns with most µPs being non-operational below 1.0 V, so no external pull-down is needed.

Can APX803S00-23SA-7 monitor a 5.0 V supply while driving a 3.3 V microcontroller's reset pin?

Yes. Its open-drain RESET output allows an external pull-up resistor to 3.3 V, enabling level-shifted reset signaling. The output withstands up to 6.0 V, and sink current is specified up to 3.5 mA at 0.4 V - sufficient for standard CMOS reset inputs.

How does the 1.7 ms reset timeout compare to other APX803S variants?

The "00" suffix denotes the shortest timeout option: 1.7 ms typical (1–3.3 ms min/max). Other variants include "05" (50 ms) and blank (240 ms). This short duration targets fast-boot processors like ARM Cortex-M0+ where extended reset delays impede real-time responsiveness.

Is a decoupling capacitor required on the VCC pin of APX803S00-23SA-7?

Yes. A 100 nF ceramic capacitor placed within 2 mm of the VCC and GND pins is mandatory to suppress high-frequency noise and ensure stable comparator operation during supply transients. Layout guidelines specify 0.5 mm trace width and direct connection to ground plane.