Diodes Incorporated APX803L-37W5-7

Overview

APX803L-37W5-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in embedded digital systems. It features a fixed 3.7V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms built-in reset timeout - enabling reliable power-on reset and brownout protection in battery-powered instrumentation and portable electronics.

For engineers reviewing the APX803L-37W5-7 datasheet, APX803L-37W5-7 pinout, APX803L-37W5-7 application, or APX803L-37W5-7 equivalent, this device delivers precise, low-burden voltage supervision with factory-set timing and no external components required - critical for space-constrained, energy-sensitive designs requiring deterministic reset behavior under varying supply conditions.

Technical Context

The APX803L-37W5-7 implements a precision bandgap-based voltage reference and comparator architecture to detect when V_CC falls below 3.7V, triggering an active-low open-drain RESET signal within 20µs. Its internal hysteresis (0.01×V_TH) prevents chatter near threshold, and temperature coefficient is limited to 50 ppm/°C across –40°C to +85°C.

It operates from 0.9V to 5.5V supply, supports sink currents up to 20mA on the RESET pin, and integrates a fixed 220ms recovery delay (APX803L20 variant) - eliminating need for external RC timing networks while ensuring stable processor initialization after power recovery.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with NC pins; compact surface-mount footprint optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with APX803L20-37SA-7, the W5 package offers better thermal performance in high-density layouts; versus TLV803EA37DBZR, the APX803L-37W5-7 provides guaranteed 220ms timing without tolerance stack-up from external components - simplifying qualification for medical and industrial safety standards.

Availability

APX803L-37W5-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, smart meter interface modules, and POS terminal power sequencers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for APX803L-37W5-7 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 company 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-critical and space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L-37W5-7?

The APX803L-37W5-7 has a factory-set detection threshold of 3.7V with a guaranteed accuracy of ±1.5% over temperature (–40°C to +85°C), corresponding to a range of 3.645V to 3.755V at +25°C. This value is laser-trimmed during production and does not require external calibration.

Can the RESET pin drive a 3.3V microcontroller directly?

Yes - the open-drain RESET output can interface directly with 3.3V logic when pulled up to 3.3V via an external resistor. The device sinks up to 20mA, and VOL is ≤0.4V at 3.5mA sink current, ensuring valid logic-low levels across process and temperature variations.

Is there any minimum bypass capacitance required on V_CC?

Yes - the datasheet specifies a 100nF ceramic capacitor placed as close as possible to the V_CC and GND pins. This stabilizes the internal reference and prevents false resets caused by supply transients or high-frequency noise coupling into the detection circuitry.

Does APX803L-37W5-7 support operation below 1.0V supply?

No - the absolute minimum recommended V_CC is 0.9V, but functional operation (including accurate threshold detection and guaranteed reset assertion) begins only at V_CC ≥ 1.02×V_TH (≥3.774V). Below that, the device enters undervoltage lockout and RESET remains asserted.