Diodes Incorporated APX803S00-26SR-7

Overview

APX803S00-26SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for precise 2.63 V supply monitoring in embedded systems. It asserts an active-low RESET signal during power-up, brownout, or voltage sag below threshold and holds it for ≥1 ms after VCC recovers. With 10 µA typical supply current and guaranteed operation down to VCC = 1 V, it supports battery-powered controllers and portable instrumentation.

For engineers reviewing the APX803S00-26SR-7 datasheet, APX803S00-26SR-7 pinout, APX803S00-26SR-7 application, or APX803S00-26SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.04 V), minimum timeout period (1 ms), open-drain output compatibility with bidirectional µP reset pins, and SOT23-SR package footprint alignment with space-constrained PCB layouts.

Technical Context

The APX803S00-26SR-7 implements a precision bandgap-based voltage comparator with 30 ppm/°C tempco to monitor VCC against a fixed 2.63 V threshold. Its internal timer initiates only after VCC rises above VTH and enforces a minimum 1 ms reset assertion window - distinct from longer-delay variants (e.g., 140–240 ms).

It features an open-drain RESET output capable of sinking up to 3.5 mA at 0.4 V while maintaining logic-low validity down to VCC = 1 V. The design ignores fast transients on VCC via inherent hysteresis and dVCC/dt immunity up to 100 V/µs, ensuring robustness in noisy power environments.

Key Specifications

Pinout & Package

The APX803S00-26SR-7 is housed in a RoHS-compliant SOT23-3 (SR package) with gull-wing leads and 0.915 mm nominal lead pitch. Thermal resistance is θJA = 232 °C/W, supporting operation in ambient temperatures from –40 °C to +85 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803S00-26SR-7, the APX809S-26SA-7 eliminates external pull-up needs but forfeits bus-sharing capability, while the MAX809TRD2T1G trades timing precision and low ICC for pin-for-pin legacy compatibility at the cost of reduced design flexibility.

Availability

APX803S00-26SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX803S00-26SR-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 APX803S series belongs to Diodes' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications demanding precision voltage thresholds, low quiescent current, and robust transient immunity.

FAQ

What is the exact reset threshold voltage for APX803S00-26SR-7?

The APX803S00-26SR-7 has a nominal reset threshold of 2.63 V, with a guaranteed range of 2.59 V to 2.67 V at +25 °C. This value is factory-trimmed and exhibits a maximum tempco of 30 ppm/°C across –40 °C to +85 °C, ensuring stable operation in varying thermal environments without external calibration.

Can APX803S00-26SR-7 drive multiple microcontrollers on a shared reset bus?

Yes - its open-drain RESET output enables wired-OR configuration with other open-drain reset sources. A single pull-up resistor to the target logic supply (e.g., 3.3 V) allows multiple APX803S00-26SR-7 devices or compatible supervisors to share one reset line without contention, provided total sink current remains within 20 mA absolute maximum rating.

Does APX803S00-26SR-7 require external components for basic operation?

No external components are required for fundamental reset supervision. Only a pull-up resistor on the RESET pin is needed for proper logic-level translation. Unlike RC-based solutions, it does not require timing capacitors or voltage dividers, reducing BOM count and improving long-term reliability in temperature-varying applications.

How does the device behave when VCC falls below 1.0 V?

When VCC drops below 1.0 V, the APX803S00-26SR-7 ceases to actively drive the RESET pin low and transitions to a high-impedance state. The output becomes an open circuit, allowing external pull-up to define the logic level. This behavior prevents undefined reset states during deep power loss while aligning with µP inactivity below 1.0 V.