Diodes Incorporated APX803D-29SAG-7

Overview

APX803D-29SAG-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor reset supervisor IC with 2.93V precision reset threshold, open-drain active-low RESET output, and 1ms minimum reset timeout. It monitors 3.3V/3.0V digital power rails in embedded controllers and portable equipment, asserting reset during power-up, brownout, or supply glitches to ensure deterministic µP startup.

For engineers reviewing the APX803D-29SAG-7 datasheet, APX803D-29SAG-7 pinout, APX803D-29SAG-7 application, or APX803D-29SAG-7 equivalent, key selection criteria include reset threshold accuracy (±0.04V), guaranteed operation down to VCC = 1V, 30µA typical supply current, open-drain interface compatibility with bidirectional µP reset pins, and SOT23 package footprint constraints.

Technical Context

The APX803D-29SAG-7 implements a precision bandgap-based voltage comparator with 40mV hysteresis and 30ppm/°C tempco to detect VCC drops below 2.93V. Its internal oscillator drives a fixed 1ms timeout timer that restarts on every threshold crossing, ensuring glitch immunity for dVCC/dt up to 100V/µs.

Designed for low-power systems, it guarantees valid RESET assertion (≤0.3V at 1.2mA sink) while consuming only 30µA at 25°C and maintaining functionality across -40°C to +85°C ambient, with thermal resistance θJA = 201°C/W in SOT23.

Key Specifications

Pinout & Package

APX803D-29SAG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 2.4mm × 1.3mm footprint and 0.95mm height, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803-29SAG-7 and TPS3808G18DBVR, the APX803D-29SAG-7 uniquely balances ultra-low power (30µA), precise 2.93V threshold, and minimal 1ms timeout-making it optimal for modern 3.3V µP systems demanding fast boot and robust brownout immunity without design compromises.

Availability

APX803D-29SAG-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 and long-term lifecycle support.

Supply support for APX803D-29SAG-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' precision power-supervision product line, engineered specifically for deterministic microprocessor reset generation in cost-sensitive, space-constrained embedded systems with stringent reliability requirements.

FAQ

What is the minimum VCC required for APX803D-29SAG-7 to assert a valid RESET signal?

The device guarantees RESET remains a valid logic low (≤0.3V at 1.2mA sink) for VCC ≥ 1.0V. Below 1.0V, the output transitions to high-impedance, so system-level pull-up resistors must be sized to maintain defined logic levels during deep brownout conditions.

Can APX803D-29SAG-7 interface directly with a µP that has a bidirectional reset pin?

Yes-the open-drain RESET output allows direct connection to bidirectional reset pins (e.g., Motorola 68HC11) using a single external pull-up resistor. Either the supervisor or µP can drive the line low, enabling coordinated reset arbitration without additional logic.

How does the 40mV hysteresis affect system behavior during VCC recovery?

The 40mV hysteresis ensures RESET remains asserted until VCC rises to 2.97V (2.93V + 40mV), preventing oscillation during slow or noisy power-up sequences. This eliminates multiple reset pulses that could corrupt µP initialization routines.

Is APX803D-29SAG-7 suitable for new designs despite the "NOT RECOMMENDED FOR NEW DESIGN USE" note in the datasheet?

No-the datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGN USE" for APX803/D variants. Engineers should evaluate Diodes' newer APX809/810 series or industry alternatives for new projects to ensure long-term supply and enhanced features like push-pull outputs and tighter tolerances.