Diodes Incorporated APX803L20-43SA-7

Overview

APX803L20-43SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.3V threshold detection with ±1.5% accuracy, 220ms reset timeout, and 1µA typical supply current in SOT23-3 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L20-43SA-7 datasheet, APX803L20-43SA-7 pinout, APX803L20-43SA-7 application, or APX803L20-43SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation, and compatibility with 1.2–5.5V supply rails in space-constrained embedded systems.

Technical Context

The APX803L20-43SA-7 implements a precision bandgap-based voltage reference with built-in hysteresis (0.01×V_TH) to prevent reset chatter during supply ramp-up/down. Its internal fixed 4.3V detection threshold is laser-trimmed at wafer level for ±1.5% initial accuracy across -40°C to +85°C ambient.

It features a temperature-compensated comparator driving an open-drain NMOS output stage capable of sinking ≥3.5mA at V_OL ≤ 0.4V, with propagation delay <20µs from V_CC drop to RESET assertion and guaranteed recovery after V_CC exceeds 1.02×V_TH.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G22DBVR and MAX809SEUR+T, the APX803L20-43SA-7 provides tighter threshold accuracy (±1.5% vs. ±2.5%), exact 4.3V detection without external components, and superior low-temperature performance down to -40°C - making it optimal for next-generation battery-constrained medical and industrial edge devices.

Availability

APX803L20-43SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial remote I/O modules, and medical infusion pumps requiring stable component supply with guaranteed long-term continuity.

Supply support for APX803L20-43SA-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 ICs for power management, signal integrity, and connectivity applications.

The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-efficient systems, emphasizing precision threshold control, minimal quiescent current, and robust operation across extended temperature ranges.

FAQ

What is the exact reset threshold voltage for APX803L20-43SA-7?

The APX803L20-43SA-7 has a factory-trimmed nominal reset threshold of 4.3V with ±1.5% accuracy at +25°C, verified per DS38171 Rev. 3-2 electrical characteristics table. This value remains stable across -40°C to +85°C with a temperature coefficient of 50ppm/°C, ensuring consistent detection behavior in varying environmental conditions.

Does APX803L20-43SA-7 require external components for basic operation?

No external components are required. The device integrates a precision voltage reference, comparator, hysteresis circuit, and open-drain output driver in a single SOT23-3 package. Only a decoupling capacitor (100nF recommended) on V_CC is advised for noise immunity - no resistors, capacitors, or additional ICs are needed for functional reset generation.

How does the 220ms reset timeout behave under varying supply voltages?

The 220ms timeout (typ.) is factory-programmed and specified at V_CC ≥ 1.02×V_TH. Per DS38171 Figure 5, timeout variation is ±10% over -40°C to +85°C and remains stable across 0.9V–5.5V supply range, with no dependence on input voltage magnitude - ensuring predictable reset hold time regardless of rail level during recovery.

Can APX803L20-43SA-7 drive a 10kΩ pull-up to 5V?

Yes. With VOL ≤ 0.4V at ISINK = 3.5mA (per datasheet), the output easily sinks current for standard 10kΩ pull-ups to 5V (0.5mA), delivering a solid logic-low reset signal. The open-drain architecture allows direct connection to µP reset inputs rated for 5V-tolerant operation without level-shifting circuitry.