Diodes Incorporated APX803-26SAG-7

Overview

APX803-26SAG-7 from Diodes Incorporated is a precision 3-pin microprocessor reset circuit with 2.63 V reset threshold, open-drain active-low RESET output, and 200 ms typical reset timeout period. It monitors 3.0 V/3.3 V power rails in embedded microcontroller systems, asserting reset during power-up, brownout, or supply glitches to ensure deterministic startup in industrial controllers and portable instrumentation.

For engineers reviewing the APX803-26SAG-7 datasheet, APX803-26SAG-7 pinout, APX803-26SAG-7 application, or APX803-26SAG-7 equivalent, key selection criteria include guaranteed reset validity down to VCC = 1 V, 30 µA typical supply current, ±40 mV hysteresis, and SOT23-3 (SA) package compatibility with space-constrained PCB layouts.

Technical Context

The APX803-26SAG-7 implements a precision voltage comparator with internal bandgap reference and fixed-delay timer to generate a clean, glitch-immune reset pulse. Its reset assertion is triggered when VCC falls below 2.63 V (±0.04 V), with hysteresis ensuring stable release at ~2.67 V.

It features an open-drain N-channel output stage capable of sinking ≥1.2 mA at VCC ≥ 2.5 V and VOL ≤ 0.3 V, enabling flexible pull-up configuration across mixed-voltage systems. The device operates over -40°C to +85°C ambient and remains functional down to VCC = 1.0 V, with reset timing fully specified across temperature.

Key Specifications

Pinout & Package

APX803-26SAG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with gull-wing leads, optimized for automated placement and reflow soldering on FR-4 PCBs with standard 2 oz copper pads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T1G and TPS3808G12DBVR, APX803-26SAG-7 delivers superior brownout resilience (valid reset to 1.0 V), eliminates external components, and maintains tighter timeout consistency across temperature - critical for safety-critical embedded boot integrity.

Availability

APX803-26SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instrumentation, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for APX803-26SAG-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 APX803 series belongs to Diodes' µP supervisory product line, engineered specifically for deterministic reset generation in resource-constrained embedded systems where precision threshold, low IQ, and guaranteed low-VCC operation are mandatory.

FAQ

What is the exact reset threshold voltage and tolerance for APX803-26SAG-7?

The APX803-26SAG-7 has a nominal reset threshold of 2.63 V, with a guaranteed range of 2.59 V to 2.66 V at +25°C. This tolerance remains stable across -40°C to +85°C ambient, with a tempco of ≤30 ppm/°C, ensuring consistent brownout detection in varying thermal environments.

Can APX803-26SAG-7 drive a reset line shared among multiple microcontrollers?

Yes - its open-drain RESET output supports wired-OR configuration. Multiple APX803-26SAG-7 devices (or other open-drain supervisors) can share a single reset bus with one pull-up resistor. Ensure total sink current stays within 20 mA absolute maximum and that combined leakage remains <1 µA to avoid false releases.

Does APX803-26SAG-7 require an external capacitor for reset timing?

No - the 200 ms reset timeout is generated by an internal oscillator and delay circuit. No external timing capacitor or resistor is needed, reducing BOM count and eliminating component aging or temperature drift effects on reset duration.

Is APX803-26SAG-7 compatible with 1.8 V microcontrollers?

While the APX803-26SAG-7 itself operates down to VCC = 1.1 V and asserts valid reset down to 1.0 V, its RESET output is open-drain and requires an external pull-up to the target µC's VDD rail. For 1.8 V µCs, pull up to 1.8 V with a resistor ≤10 kΩ to ensure VOL ≤ 0.3 V at ISINK = 1.2 mA.