Diodes Incorporated APX809S00-31SA-7

Overview

APX809S00-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 3.08V nominal supply monitoring applications. It provides active-low push-pull reset assertion when VCC drops below 3.04–3.12V, maintains reset for ≥240ms after recovery, operates down to 1V supply, draws only 7µA typical supply current, and is housed in a RoHS-compliant SOT23-3 (SA) package for portable and battery-powered systems.

For engineers reviewing the APX809S00-31SA-7 datasheet, APX809S00-31SA-7 pinout, APX809S00-31SA-7 application, or APX809S00-31SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), guaranteed reset validity at VCC = 1V, 240ms minimum timeout, push-pull output drive capability, and SOT23-3 footprint compatibility with space-constrained embedded designs.

Technical Context

The APX809S00-31SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V threshold with ±0.04V tolerance over temperature. Its internal timing circuit ensures a minimum 240ms reset pulse width after VCC exceeds the threshold, independent of external components.

Designed for low-power operation, it features a 7µA typical supply current and guarantees correct logic state for RESET output down to VCC = 1V. The push-pull output eliminates need for external pull-up resistors and supports direct interface with µP reset inputs requiring active-low assertion.

Key Specifications

Pinout & Package

APX809S00-31SA-7 is supplied in a lead-free, halogen-free SOT23-3 (SA) surface-mount package with 2.4mm × 1.3mm footprint and 0.95mm height, optimized for automated assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX809S00-31SA-7, the -30 variant offers earlier reset triggering for conservative 3.0V systems, while TPS3808G30DBVR trades higher accuracy and lower current for increased board area and external component dependency.

Availability

APX809S00-31SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX809S00-31SA-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 APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, space-constrained applications requiring precise, low-power voltage monitoring without external components.

FAQ

What is the exact reset threshold voltage for APX809S00-31SA-7?

The APX809S00-31SA-7 has a guaranteed reset threshold range of 3.04V to 3.12V at +25°C, with a typical value of 3.08V. This specification is validated per DS39140 Rev. 2–2, Table 1, and remains stable across temperature with a maximum drift of ±30ppm/°C from –40°C to +125°C.

Does APX809S00-31SA-7 require an external pull-up resistor on the RESET pin?

No. APX809S00-31SA-7 features a push-pull output stage that actively drives LOW during reset and HIGH when released, eliminating the need for an external pull-up resistor. This reduces BOM count, saves PCB area, and improves noise immunity compared to open-drain alternatives.

Can APX809S00-31SA-7 operate reliably below 2.5V supply?

Yes. The device guarantees correct RESET logic state down to VCC = 1.0V, enabling reliable brown-out detection during deep discharge of lithium coin cells or supercapacitor hold-up circuits. Its internal comparator and output driver remain functional across the full 1.0–5.5V operating range.

Is the SOT23-3 (SA) package of APX809S00-31SA-7 compatible with standard SOT23 footprints?

Yes. The SA variant uses the industry-standard SOT23-3 outline (JEDEC TO-236AB) with 0.95mm max height, 2.4mm × 1.3mm body, and 0.95mm pitch. Pad layout matches common SMT reflow profiles and is verified in Diodes' package outline document PN-000013.