Diodes Incorporated APX803S05-26SA-7

Overview

APX803S05-26SA-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor reset supervisor IC with 2.63 V precision reset threshold, open-drain active-low RESET output, 50 ms typical reset timeout, 10 µA typical supply current, and guaranteed operation down to VCC = 1 V. It monitors 2.5–5.0 V power rails in embedded microcontroller systems requiring reliable brownout detection and power-on reset assertion.

For engineers reviewing the APX803S05-26SA-7 datasheet, APX803S05-26SA-7 pinout, APX803S05-26SA-7 application, or APX803S05-26SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.04 V), temperature coefficient (30 ppm/°C), minimum reset timeout (20 ms), open-drain drive capability (3.5 mA sink at 0.4 V), and SOT23-SA package compatibility with high-density PCB layouts.

Technical Context

The APX803S05-26SA-7 integrates a precision voltage comparator with internal hysteresis and a fixed-delay monostable timer. Its reset threshold is trimmed to 2.63 V (typ.) at +25°C with ±0.04 V tolerance over –40°C to +85°C and 30 ppm/°C tempco.

Upon VCC rising above 2.63 V, the device asserts an active-low RESET signal for ≥20 ms (min) and ≤70 ms (max); during brownout, RESET reasserts immediately when VCC falls below threshold, resetting the internal timer. The open-drain output supports bidirectional reset interfaces and level-shifting across supply domains.

Key Specifications

Pinout & Package

APX803S05-26SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 2.9 mm × 1.3 mm footprint and 0.95 mm height. Pin 1 is GND, Pin 2 is VCC, and Pin 3 is open-drain RESET - confirmed per Diodes DS39161 Rev. 2-2 top-view diagram and ordering table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G01DBVR, APX803S05-26SA-7 uniquely balances 50 ms reset timing for fast-boot MCUs, open-drain flexibility for shared reset architectures, and industrial-grade tempco performance - making it optimal for space-constrained embedded controllers needing precise, field-proven brownout response.

Availability

APX803S05-26SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for APX803S05-26SA-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' precision voltage supervisor product line, designed specifically for cost-sensitive, space-constrained microcontroller systems requiring accurate, low-power reset functionality across wide temperature ranges.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803S05-26SA-7?

The APX803S05-26SA-7 has a nominal reset threshold of 2.63 V at +25°C, with a guaranteed range of 2.59 V to 2.67 V across temperature and process variation. This ±0.04 V tolerance is specified in Diodes DS39161 Rev. 2-2 Table 1 and ensures consistent brownout detection in 2.5 V systems without external calibration.

Can APX803S05-26SA-7 drive a reset line shared with other open-drain devices?

Yes - its open-drain RESET output is explicitly designed for wired-OR configurations. When multiple APX803S05-26SA-7 or compatible supervisors share a reset bus, any device asserting low will hold the entire line low, satisfying simultaneous reset requirements in multi-rail systems without contention.

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

Each time VCC falls below 2.63 V, the internal timer resets and restarts. RESET remains asserted for ≥20 ms after VCC rises above threshold - meaning rapid voltage fluctuations produce clean, non-overlapping reset pulses with no minimum off-time requirement between assertions.

Is APX803S05-26SA-7 compatible with 1.8 V microcontrollers?

No - while the device operates down to VCC = 1.0 V, its 2.63 V reset threshold is intended for 2.5 V or higher rails. For 1.8 V systems, Diodes offers the APX803SXX-18 variants (e.g., APX803S-18SA-7) with 1.78 V threshold; using APX803S05-26SA-7 on 1.8 V would cause permanent reset assertion.