Diodes Incorporated APX803L05-29C3-7

Overview

APX803L05-29C3-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in battery-powered and embedded digital systems. It features a fixed 2.9V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 55ms reset timeout - enabling reliable power-on reset and brownout protection in portable instrumentation and IoT edge nodes.

For engineers reviewing the APX803L05-29C3-7 datasheet, APX803L05-29C3-7 pinout, APX803L05-29C3-7 application, or APX803L05-29C3-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation under partial V_CC ramp-up, and SOT323 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L05-29C3-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during slow V_CC transitions. Its comparator drives an open-drain NMOS output stage, requiring an external pull-up for logic-level compatibility with 1.8V–5.5V µP reset inputs.

Reset assertion occurs within 20µs after V_CC drops below 2.9V, and release is delayed by a factory-trimmed 55ms timeout (guaranteed 35–75ms across -40°C to +85°C) to ensure stable system boot after power recovery.

Key Specifications

Pinout & Package

SOT323 (SC-70) 3-pin surface-mount package: ultra-compact footprint (2.1mm × 1.25mm × 0.95mm height), lead-free, RoHS-compliant, suitable for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV803E29DBVR and MAX809SEUR+T, the APX803L05-29C3-7 delivers optimal balance of low I_Q, precise 2.9V threshold, and moderate 55ms timeout - making it ideal for cost-sensitive, space-constrained portable electronics where rapid, deterministic reset behavior is required without excessive hold time.

Availability

APX803L05-29C3-7 is available at Aetrix Electronics and suitable for smart wearable power monitoring, industrial sensor node supervision, medical diagnostic handhelds, and automotive body control module subsystems requiring stable component supply and long-term production continuity.

Supply support for APX803L05-29C3-7 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in battery-operated and energy-conscious embedded systems.

FAQ

What is the exact detection threshold voltage of APX803L05-29C3-7?

The APX803L05-29C3-7 has a factory-trimmed detection threshold of 2.90V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and does not require external resistor configuration. Measured threshold variation remains within ±43.5mV across the full operating range, ensuring consistent brownout response in 3.3V systems.

Does APX803L05-29C3-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to the host supply rail (e.g., 10kΩ to 3.3V) is mandatory for proper logic-level generation. Without it, the output cannot drive high, resulting in undefined or permanently asserted reset states. The datasheet specifies maximum sink current of 20mA, supporting standard pull-up values from 4.7kΩ to 100kΩ.

Can APX803L05-29C3-7 operate from a 1.8V supply?

No - while the device monitors V_CC down to 0.9V, its minimum functional supply voltage is 0.9V, but reliable operation requires V_CC ≥ 1.02×V_TH = 2.96V for reset release. At 1.8V input, the internal reference and comparator lack sufficient headroom to function correctly; the part will remain in permanent reset state and draw no meaningful current. It is not rated for sub-2.5V operation.

Is APX803L05-29C3-7 qualified for automotive applications?

No - the APX803L05-29C3-7 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., APX803L05-29W5-7 in SOT25) with PPAP capability and IATF 16949 manufacturing, but this SOT323 variant is intended for commercial/industrial use only. Its guaranteed operating ambient range is –40°C to +85°C, falling short of automotive Grade 2 (–40°C to +105°C) requirements.