Diodes Incorporated APX803-31SRG-7

Overview

APX803-31SRG-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor reset supervisor IC with 3.08V ±0.05V precision reset threshold, open-drain active-low RESET output, and 200ms typical reset timeout period. It monitors VCC supply integrity in embedded microcontroller systems, asserts reset during power-up/brownout, and guarantees valid logic state down to VCC = 1V. Used in portable instrumentation and industrial controllers requiring reliable power-on initialization.

For engineers reviewing the APX803-31SRG-7 datasheet, APX803-31SRG-7 pinout, APX803-31SRG-7 application, or APX803-31SRG-7 equivalent, key selection criteria include reset threshold accuracy (±0.05V), guaranteed operation at VCC ≥1V, open-drain drive capability (1.2mA sink @ 0.3V), 30µA typical supply current, and SOT23-SR package compatibility with space-constrained PCB layouts.

Technical Context

The APX803-31SRG-7 implements a precision bandgap-based voltage comparator with 30ppm/°C tempco and 40mV hysteresis to reject supply transients. Its internal oscillator controls a fixed 200ms reset timeout after VCC rises above the 3.08V threshold.

Designed for direct interface with µP reset inputs, it features an open-drain N-channel output stage capable of sinking 1.2mA at VOL ≤0.3V while maintaining guaranteed logic low down to VCC = 1V - enabling robust reset assertion even during deep brownout conditions.

Key Specifications

Pinout & Package

APX803-31SRG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR package) with gull-wing leads and standard JEDEC MO-178 footprint. Thermal resistance θJA = 201°C/W on FR-4 with 2oz copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803-31SAG-7, the SR package offers better thermal dissipation and matches modern SOT23 assembly standards; versus MAX809TRD3-T, the open-drain output enables shared reset buses and bidirectional µP compatibility at the cost of slightly higher quiescent current.

Availability

APX803-31SRG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX803-31SRG-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 devices for industrial, computing, and consumer markets.

The APX803 series belongs to Diodes' precision power-supervision product line, engineered specifically for deterministic reset timing and wide-temperature stability in microcontroller-based embedded systems.

FAQ

What is the minimum VCC required for APX803-31SRG-7 to assert a valid RESET signal?

The device guarantees RESET remains a valid logic low down to VCC = 1V. Below this voltage, the output enters high-impedance state and no longer sinks current. This ensures deterministic reset behavior during brownout recovery while allowing system-level power sequencing to manage sub-1V states.

Can APX803-31SRG-7 be used with a 5V microcontroller reset input?

Yes - its open-drain RESET output supports level-shifting. Connect the external pull-up resistor to the µP's 5V supply rail. The device sinks current only when asserting reset, and its VOL ≤0.3V at 1.2mA ensures solid logic-low compatibility with 5V CMOS inputs.

How does the 40mV hysteresis improve system reliability?

The 40mV hysteresis between rising and falling reset thresholds prevents oscillatory reset assertion during slow or noisy VCC recovery. Without hysteresis, marginal supply conditions could cause repeated reset toggling, risking flash memory corruption or peripheral lockup.

Is APX803-31SRG-7 suitable for new designs despite Diodes' "Not Recommended" note on APX803S?

Yes - the "Not Recommended" notice applies exclusively to the obsolete APX803S variant. APX803-31SRG-7 is a current-production part with full datasheet support, green packaging, and active lifecycle status per Diodes' official ordering information and package outlines.