Diodes Incorporated APX803L20-35SA-7

Overview

APX803L20-35SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.5V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 220ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L20-35SA-7 datasheet, APX803L20-35SA-7 pinout, APX803L20-35SA-7 application, or APX803L20-35SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current impact on system battery life, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L20-35SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during power-up/down transitions. Its comparator continuously monitors V_CC against a fixed 3.5V threshold and asserts the open-drain RESET pin low when V_CC drops below that level.

Reset assertion persists until V_CC rises above the release threshold (V_{TH_H} = V_{TH_L} + V_HYS), after which the 220ms recovery delay timer begins counting before releasing RESET. The device requires no external components and draws only 1µA at 25°C, enabling direct integration into ultra-low-power systems.

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 APX803L20-35SA-7, the TPS3808G33DBVR offers tighter delay tolerance but higher quiescent current and larger package; the MAX6326UR33+T matches the SOT23-3 footprint but sacrifices 1.0% threshold accuracy and lacks hysteresis documentation-critical for noisy automotive environments.

Availability

APX803L20-35SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial PLCs, and portable medical diagnostics requiring stable component supply across multi-year production cycles.

Supply support for APX803L20-35SA-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 belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-constrained and thermally demanding environments.

FAQ

What is the exact reset threshold voltage of APX803L20-35SA-7?

The APX803L20-35SA-7 has a factory-trimmed nominal reset threshold of 3.5V with guaranteed accuracy of ±1.5% over –40°C to +85°C ambient temperature. This corresponds to a minimum threshold of 3.4475V and maximum of 3.5525V at 25°C, per DS38171 Rev. 3–2 Section 5 Electrical Characteristics.

Can APX803L20-35SA-7 be used with a 5V supply rail?

Yes - the APX803L20-35SA-7 supports V_CC from 0.9V to 5.5V per Recommended Operating Conditions. When monitoring a 5V rail, it asserts RESET only when that rail drops below 3.5V, making it suitable for supervising post-regulated 3.5V or 3.3V logic supplies derived from 5V sources.

Does APX803L20-35SA-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 (typically 10kΩ to 100kΩ) to the monitored or host supply rail is mandatory to establish a valid high-level logic state when not asserted. No internal pull-up is integrated.

Is APX803L20-35SA-7 qualified for automotive applications?

No - APX803L20-35SA-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states in the datasheet that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing - none of which apply to this part. Use only in commercial/industrial applications.