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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated APX803L20-18SA-7

Name: APX803L20-18SA-7
Brand: Diodes Incorporated
SKU: APX803L20-18SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L20-18SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: APX803L20-18SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX803L20-18SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC in battery-powered and embedded digital systems. It features a fixed 1.8 V detection threshold (±1.5% accuracy), 220 ms reset timeout, open-drain active-low RESET output, and consumes only 1 µA typical supply current. It is used in portable instrumentation and low-power microcontroller power-up sequencing.

For engineers reviewing the APX803L20-18SA-7 datasheet, APX803L20-18SA-7 pinout, APX803L20-18SA-7 application, or APX803L20-18SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability, and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-18SA-7 implements a precision bandgap-based voltage reference and comparator to detect when V_CC falls below 1.8 V, triggering an active-low open-drain RESET signal. Its internal hysteresis (0.01 × V_TH) prevents chatter near threshold during slow-rising or noisy supply conditions.

It integrates a factory-programmed 220 ms reset timeout (typ. 143–297 ms across temperature), enabling reliable power-on reset assertion for microcontrollers requiring guaranteed initialization hold time. No external components are needed - the device operates standalone with only V_CC, GND, and RESET load connection.

Key Specifications

Parameter	Value and Actual Design Meaning
Detection Threshold	1.8 V ±1.5% - ensures accurate brown-out detection for 1.8 V logic domains and low-voltage µC cores.
Supply Current	1.0 µA (typ.), 2.5 µA (max.) - enables multi-year operation in coin-cell–powered devices without measurable battery drain.
Reset Timeout	220 ms (typ.), 143–297 ms (–40°C to +85°C) - guarantees sufficient hold time for full µP boot sequence completion.
Output Type	Open-drain, active-low - supports wired-OR reset bus architectures and flexible pull-up voltage selection (up to 5.5 V).
Response Time	≤20 µs - provides fast fault reaction to sudden V_CC collapse, preventing corrupted register states.
Operating Voltage	0.9 V to 5.5 V - allows use across wide input rails including partially discharged batteries and post-LDO supplies.
Threshold Tempco	50 ppm/°C - maintains stable trip point across industrial temperature range without calibration.

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3 mm × 2.9 mm × 1.0 mm body, gull-wing leads, RoHS-compliant matte tin lead finish.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Reference ground return path; must be low-impedance connection to system ground plane.
2	RESET	Open-drain output; requires external pull-up resistor to define asserted logic high level and sink current capability.
3	V_CC	Power supply input; powers internal reference and comparator; decoupling capacitor (100 nF) recommended at pin.

Key Features

Feature	Design Value
Ultra-low quiescent current	1 µA typical - eliminates need for enable control in always-on supervision applications.
Factory-trimmed threshold	1.8 V with ±1.5% initial accuracy - removes requirement for external resistor divider or calibration.
Programmable reset delay	220 ms option - matches typical µP reset timing requirements without external RC network.
No external components	Self-contained operation - reduces BOM count, layout area, and failure modes in safety-critical power monitoring.
Wide supply range	0.9 V to 5.5 V - supports direct connection to Li-ion, NiMH, or regulated 1.8/3.3/5.0 V rails.

Applications

Portable Medical Sensors

Industrial PLC I/O Modules

Use Scenario: Battery-powered glucose meter with ARM Cortex-M0+ MCU and BLE radio.

IC Role / Device Role / Timing Role: Monitors 1.8 V core rail; asserts RESET until V_CC stabilizes post-battery insertion or cold start.

Use Value: Prevents firmware execution before regulator output settles, eliminating flash corruption and sensor initialization errors.

Use Scenario: DIN-rail mounted remote I/O node with isolated 3.3 V logic supply.

IC Role / Device Role / Timing Role: Supervises isolated DC-DC converter output; holds µC in reset during input brownout or transient dropout.

Use Value: Ensures deterministic recovery after line disturbance, avoiding spurious analog input reads or relay chatter.

Smart Home Hub Controllers

Automotive Body Control Modules (Non-AEC)

Use Scenario: Wi-Fi–enabled home automation hub powered by USB-C PD (5 V → 1.8 V LDO).

IC Role / Device Role / Timing Role: Detects 1.8 V LDO failure; generates 220 ms RESET pulse synchronized to power-good status.

Use Value: Guarantees clean boot after hot-plug events or LDO thermal shutdown, improving OTA update reliability.

Use Scenario: Aftermarket lighting controller using 12 V automotive supply with 1.8 V FPGA configuration rail.

IC Role / Device Role / Timing Role: Provides fail-safe reset during cranking-induced voltage sag (down to 6 V battery).

Use Value: Maintains functional safety by forcing controlled reinitialization instead of undefined logic state.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV803EA18DPWR	1.8 V threshold, 200 ms delay, 0.5 µA I_Q, SOT23-3 - lower supply current but tighter tempco (30 ppm/°C) and no hysteresis spec.	Preferred for ultra-low-power wearables where sub-µA drain is critical; less suitable for noisy industrial rails due to missing hysteresis guarantee.	Select TLV803EA18DPWR only if <0.6 µA I_Q is mandatory and board-level filtering compensates for missing hysteresis.
MAX809SEUR+T	1.8 V threshold, 140 ms delay, 12 µA I_Q, SOT23-3 - higher current, wider delay tolerance (±35%), no tempco spec.	Used in cost-sensitive consumer electronics where 12 µA drain is acceptable and timing margin >100 ms suffices.	Choose MAX809SEUR+T only for non-battery applications with ample power budget and relaxed reset timing constraints.

Compared with TLV803EA18DPWR and MAX809SEUR+T, the APX803L20-18SA-7 delivers optimal balance of ultra-low I_Q, guaranteed hysteresis, and industrial-grade delay stability - making it preferred for space- and energy-constrained embedded systems requiring robust, maintenance-free supervision.

Availability

APX803L20-18SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply with consistent parametric performance across production lots.

Supply support for APX803L20-18SA-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, with design centers in Asia, Europe, and the US, and manufacturing in ISO/TS 16949-certified facilities.

The APX803L series belongs to Diodes' precision power-supervision product line, engineered specifically for low-power, high-accuracy reset generation in battery-operated and energy-sensitive embedded systems.

FAQ

What is the minimum operating voltage for APX803L20-18SA-7?

The device operates down to 0.9 V per datasheet Recommended Operating Conditions. Below this, internal reference and comparator circuitry cannot guarantee correct threshold detection or RESET assertion. At 0.9 V, supply current remains within specification, but timing parameters may drift outside guaranteed limits.

Can APX803L20-18SA-7 drive a 10 kΩ pull-up to 5 V?

Yes. The open-drain RESET output can sink up to 20 mA (Absolute Maximum Rating) and specifies VOL ≤ 0.4 V at ISINK = 3.5 mA. With a 10 kΩ pull-up to 5 V, sink current is 0.5 mA - well within safe operating range and ensuring solid logic-low assertion.

Is there a version with AEC-Q100 qualification?

No - APX803L20-18SA-7 is not AEC-Q100 qualified. Diodes offers the APX809 series (e.g., APX809S20-18SA-7) for automotive applications, which undergoes stress testing per AEC-Q100 Rev H and is manufactured in IATF 16949-certified facilities.

How does the 220 ms reset timeout behave during temperature variation?

The timeout varies from 143 ms at –40°C to 297 ms at +85°C (per DS38171 Rev 3–2, p.5). This monotonic shift is fully characterized and documented - no additional derating or external compensation is required for industrial ambient operation.

APX803L20-18SA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 1.8V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 143ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX803L20-18SA-7 FAQ

1.How can I place an order for APX803L20-18SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L20-18SA-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for APX803L20-18SA-7 reliable?

The price and inventory of APX803L20-18SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-18SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L20-18SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-18SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L20-18SA-7?

APX803L20-18SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L20-18SA-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for APX803L20-18SA-7?

For technical support, including APX803L20-18SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-18SA-7 requirements.

6.How does Aetrix verify that APX803L20-18SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L20-18SA-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that APX803L20-18SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L20-18SA-7?

All APX803L20-18SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-18SA-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The APX803L20-18SA-7 part is unused and in its original packaging.

Return procedure for APX803L20-18SA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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