Diodes Incorporated APX803D-29SRG-7

Overview

APX803D-29SRG-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 guaranteed reset assertion down to V_CC = 1V. It provides power-on and brownout reset protection for 3.3V digital systems, delivering a minimum 1ms reset timeout and 30µA typical supply current - ideal for battery-powered controllers and portable instrumentation.

For engineers reviewing the APX803D-29SRG-7 datasheet, APX803D-29SRG-7 pinout, APX803D-29SRG-7 application, or APX803D-29SRG-7 equivalent, key selection factors include its fixed 1ms timeout (vs. 140ms+ in standard APX803 variants), low-voltage validity (1V), open-drain interface compatibility with bidirectional µP reset pins, and SOT23-SR package footprint.

Technical Context

The APX803D-29SRG-7 integrates a precision voltage comparator with 2.93V ±0.04V threshold, internal hysteresis (40mV), and temperature-stable tempco (30ppm/°C), enabling reliable detection of 3.3V supply droop across –40°C to +85°C. Its reset logic asserts an open-drain low signal on V_CC fall below threshold and holds it for ≥1ms after V_CC recovers above threshold.

No external timing components are required: the 1ms timeout is internally generated and fully specified over temperature. The device ignores fast V_CC transients (dV_CC/dt ≤ 100V/µs) and guarantees valid RESET state down to V_CC = 1V - critical for deterministic behavior during deep brownouts.

Key Specifications

Pinout & Package

APX803D-29SRG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with gull-wing leads, optimized for high-density PCB layouts and reflow soldering. Pin 1 = GND, Pin 2 = V_CC, Pin 3 = RESET (open-drain).

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803-29SRG-7 and TPS3808G18DBVR, the APX803D-29SRG-7 uniquely delivers minimal 1ms reset hold time with zero external components - making it optimal for space-constrained, ultra-low-power 3.3V microcontroller applications where rapid recovery is essential.

Availability

APX803D-29SRG-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for APX803D-29SRG-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' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications requiring precision voltage monitoring and guaranteed low-voltage operation.

FAQ

What is the exact reset timeout duration for APX803D-29SRG-7?

The APX803D-29SRG-7 guarantees a minimum reset timeout of 1ms after V_CC rises above the 2.93V threshold. Typical duration is 2ms at +25°C, with no upper limit specified - ensuring reliable µP initialization without unnecessary delay. This differs from standard APX803 variants, which specify ≥140ms.

Can APX803D-29SRG-7 drive a reset pin directly without a pull-up resistor?

No - the RESET pin is open-drain and requires an external pull-up resistor to the target logic supply (e.g., µP V_DD). Typical values range from 10kΩ to 100kΩ. Without pull-up, the output floats and cannot assert a valid high state, risking undefined µP behavior during normal operation.

Does APX803D-29SRG-7 remain functional when V_CC drops below 1V?

No - the device guarantees correct RESET logic state only down to V_CC = 1V. Below this, the internal circuitry ceases operation and RESET becomes high-impedance. This is intentional: most µPs are nonfunctional below 1V, so continued reset assertion is unnecessary and would increase leakage.

Is APX803D-29SRG-7 compatible with bidirectional µP reset pins like those on the MC9328MXL?

Yes - its open-drain RESET output interfaces natively with bidirectional reset pins. When paired with a shared pull-up, either the APX803D-29SRG-7 or the µP can pull the line low to initiate reset, enabling coordinated system-level recovery without additional logic or isolation components.