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

Diodes Incorporated APX803L-38SA-7

Name: APX803L-38SA-7
Brand: Diodes Incorporated
SKU: APX803L-38SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L-38SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX803L-38SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX803L-38SA-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 low-power digital systems. It features a fixed 3.8V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms built-in recovery delay - enabling reliable power-on reset and brownout protection in portable instrumentation and IoT edge nodes.

For engineers reviewing the APX803L-38SA-7 datasheet, APX803L-38SA-7 pinout, APX803L-38SA-7 application, or APX803L-38SA-7 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in Diodes' DS38171 Rev. 3–2 specification and production marking data.

Technical Context

The APX803L-38SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain RESET signal when V_CC drops below 3.8V and holds it asserted until V_CC exceeds 3.8V + hysteresis, ensuring clean system initialization.

It operates across –40°C to +85°C ambient, supports 0.9V to 5.5V supply range, and delivers sub-20µs response time from V_CC drop to RESET assertion. The 450ms timeout variant (indicated by "40" in part number) is factory-programmed and requires no external timing components.

Key Specifications

Parameter	Value and Actual Design Meaning
Detection Threshold	3.8V ±1.5% - precise brownout detection point for 3.3V/3.6V logic rails
Supply Current	1.0µA (typ.), 2.5µA (max.) - negligible load on coin-cell or energy-harvesting supplies
Reset Delay	450ms (typ.) - ensures stable power-up before releasing µP from reset
Output Type	Open-drain, active-low - enables wired-OR reset bus and flexible pull-up voltage selection
Response Time	<20µs - fast detection of rapid V_CC collapse during transient faults
Operating Temp	–40°C to +85°C - qualified for industrial and extended-temperature embedded applications
Threshold Hysteresis	0.01×V_TH (≈38mV) - prevents chatter near trip point under noisy supply conditions

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 (GND)	Ground reference	Return path for internal circuitry; must be connected to system ground plane for accurate threshold operation
2 (VCC)	Supply input	Monitored power rail input; supports 0.9V–5.5V range; powers internal reference and comparator
3 (RESET)	Open-drain reset output	Active-low signal asserted when VCC < 3.8V; requires external pull-up to logic rail (e.g., 3.3V or 5V)

Key Features

Feature	Design Value
Ultra-low quiescent current	1µA typ. - extends battery life in always-on sensor nodes beyond 10 years on CR2032
Factory-trimmed threshold	3.8V ±1.5% - eliminates need for external resistor dividers or calibration in production
Integrated delay timer	450ms fixed - replaces RC network, reducing BOM count and layout sensitivity
Robust ESD rating	±4000V HBM - withstands handling and board-level electrostatic discharge without protection diodes
Wide supply range	0.9V to 5.5V - compatible with Li-ion, alkaline, USB, and regulated 3.3V/5V rails

Applications

Portable Medical Sensors

Industrial PLC I/O Modules

Use Scenario: Wearable ECG patch operating from single CR2032 cell with intermittent BLE transmission.

IC Role / Device Role / Timing Role: Monitors 3.0V regulated rail; asserts RESET if voltage sags below 3.8V due to pulse load or battery depletion.

Use Value: Prevents firmware corruption during brownout by holding µC in reset until stable power resumes - critical for FDA Class II device reliability.

Use Scenario: DIN-rail mounted analog input module powered from 24VDC supply with local 3.3V LDO.

IC Role / Device Role / Timing Role: Supervises 3.3V domain; generates 450ms reset pulse after power-up to synchronize ADC initialization and FPGA configuration.

Use Value: Eliminates manual reset button and external timing capacitor, reducing assembly cost and field failure risk from component drift.

Smart Meter Battery Backup

Automotive Telematics Tracker

Use Scenario: Electricity meter with supercapacitor backup maintaining RTC and memory during mains outage.

IC Role / Device Role / Timing Role: Detects 3.3V rail collapse from supercap discharge; holds µC in reset until capacitor recharges above 3.8V.

Use Value: Ensures deterministic state recovery and prevents EEPROM write corruption during marginal backup power conditions.

Use Scenario: OBD-II tracker using Li-SOCl₂ primary cell with cold-cranking voltage dip immunity.

IC Role / Device Role / Timing Role: Supervises 3.3V system rail; ignores <100ms dips but asserts 450ms RESET on sustained undervoltage during engine start.

Use Value: Avoids false resets during automotive cranking transients while guaranteeing safe boot after battery recovery.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV803EA38DBVR	3.8V threshold, 1.6µA I_CC, 200ms delay, SOT-23-3	Lacks hysteresis spec; higher temp drift (100ppm/°C vs. 50ppm/°C)	Acceptable where tighter threshold stability is not required and shorter delay suffices
MAX809SEUR+T	3.8V threshold, 12µA I_CC, 240ms delay, SOT-23-3	5× higher supply current; no 450ms option; ±2.5% accuracy	Only suitable when 450ms delay is not mandatory and µA-level current is not critical

Compared with TLV803EA38DBVR and MAX809SEUR+T, the APX803L-38SA-7 delivers superior threshold accuracy (±1.5% vs. ±2.5%), lower quiescent current (1µA vs. ≥1.6µA), and exact 450ms delay - making it optimal for long-life battery systems requiring deterministic reset timing and minimal supply burden.

Availability

APX803L-38SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup, and automotive telematics trackers requiring stable component supply across multi-year production cycles.

Supply support for APX803L-38SA-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 solutions, with design centers in Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.

The APX803L series targets ultra-low-power supervisory functions in space-constrained, battery-operated systems - emphasizing microamp-level current, factory-trimmed thresholds, and integrated delay to replace discrete reset circuits.

FAQ

What is the exact detection threshold voltage for APX803L-38SA-7?

The APX803L-38SA-7 has a factory-set detection threshold of 3.8V with ±1.5% accuracy over temperature (–40°C to +85°C), confirmed in Electrical Characteristics Table of DS38171 Rev. 3–2. This value is trimmed during production and does not require external adjustment.

Can APX803L-38SA-7 drive a 10kΩ pull-up resistor to 5V?

Yes - its open-drain RESET output sinks up to 20mA (absolute max) and guarantees VOL ≤ 0.4V at ISINK = 3.5mA. With a 10kΩ pull-up to 5V, sink current is 0.5mA, well within specification and ensuring solid logic-low assertion.

Is APX803L-38SA-7 qualified for automotive applications?

No - APX803L-38SA-7 is not AEC-Q100 qualified. Diodes states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and consumer applications per its datasheet scope and marking status (EOL per DS38171 p.9).

Does the 450ms reset timeout vary with temperature or supply voltage?

Yes - the datasheet shows RESET Active Timeout Period vs. Temperature curves (p.5): at –40°C, APX803L40-XX variants deliver ~292ms; at +85°C, ~608ms. Supply voltage variation has negligible effect per characterization data - timeout is primarily temperature-dependent.

APX803L-38SA-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:: 3.8V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX803L-38SA-7 FAQ

1.How can I place an order for APX803L-38SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L-38SA-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 APX803L-38SA-7 reliable?

The price and inventory of APX803L-38SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L-38SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L-38SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-38SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L-38SA-7?

APX803L-38SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L-38SA-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 APX803L-38SA-7?

For technical support, including APX803L-38SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-38SA-7 requirements.

6.How does Aetrix verify that APX803L-38SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L-38SA-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 APX803L-38SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L-38SA-7?

All APX803L-38SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-38SA-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 APX803L-38SA-7 part is unused and in its original packaging.

Return procedure for APX803L-38SA-7:

1.Submit a request within 90 days.

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

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