Diodes Incorporated APX803S00-40SA-7

Overview

APX803S00-40SA-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for reliable power-on and brownout detection in 5.0V digital systems. It asserts an active-low RESET signal when VCC falls below 4.00V (±0.06V), holds reset for ≥1ms after VCC recovers, guarantees valid output down to VCC = 1V, draws only 10µA typical supply current, and operates across –40°C to +85°C ambient.

For engineers reviewing the APX803S00-40SA-7 datasheet, APX803S00-40SA-7 pinout, APX803S00-40SA-7 application, or APX803S00-40SA-7 equivalent, this device serves as a precision, low-power, single-function reset monitor for embedded µP/µC systems requiring fast timeout response and robust glitch immunity on 5V rails.

Technical Context

The APX803S00-40SA-7 implements a precision bandgap-based voltage comparator with 30ppm/°C tempco and internal 1ms reset timeout timer. Its open-drain RESET output requires an external pull-up and sinks up to 3.5mA at VCC ≥ VTH – 0.2V while maintaining VOL ≤ 0.4V.

It ignores fast VCC transients via inherent comparator hysteresis and dVCC/dt immunity (100 V/µs), ensuring reset assertion only during sustained undervoltage events. The device remains functional and asserts valid logic states over its full operating range (VCC = 1.0V to 5.5V).

Key Specifications

Pinout & Package

APX803S00-40SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA package) surface-mount package measuring 2.90mm × 1.30mm × 1.00mm (L × W × H), with gull-wing leads and standard JEDEC MO-178 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX809S40SA-7 and MAX809SEUR+T, the APX803S00-40SA-7 uniquely combines ultra-low ICC (10µA), open-drain flexibility, and guaranteed 1ms timeout-making it optimal for battery-sensitive, multi-device reset architectures in industrial environments.

Availability

APX803S00-40SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, and IoT edge node microcontrollers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for APX803S00-40SA-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' precision voltage supervisor product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications demanding accuracy, low power, and robust transient immunity.

FAQ

What is the exact reset threshold voltage for APX803S00-40SA-7?

The APX803S00-40SA-7 has a factory-trimmed reset threshold of 4.00V with a tolerance of ±0.06V (3.94V to 4.06V) at +25°C, and exhibits a maximum tempco of 30ppm/°C across –40°C to +85°C. This value is specified in the Electrical Characteristics table of DS39161 Rev. 2–2, page 3.

Does APX803S00-40SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain active-low and must be pulled up externally to a logic rail (e.g., 3.3V or 5V). The datasheet specifies a maximum sink current of 3.5mA at VCC ≥ VTH – 0.2V and guarantees VOL ≤ 0.4V under that condition, defining the required pull-up strength.

Can APX803S00-40SA-7 supervise a 3.3V supply?

No - APX803S00-40SA-7 is configured for 4.00V threshold and is intended for 5.0V systems. For 3.3V supervision, Diodes offers APX803S00-31SA-7 (3.08V threshold) or APX803S00-29SA-7 (2.93V threshold); using the -40 variant on 3.3V would result in premature or spurious reset assertion.

What is the minimum VCC required for APX803S00-40SA-7 to assert a valid RESET signal?

The device guarantees correct RESET logic state (low when asserted, high-impedance when released) for VCC down to 1.0V. Below 1.0V, the internal circuitry ceases to function and RESET becomes high-impedance - this is explicitly stated in the Functional Description section (page 5) and Absolute Maximum Ratings table (page 2).