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Diodes Incorporated APX803L40-40SA-7
- Part No.:
- APX803L40-40SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-40SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,026
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Product details
Overview
APX803L40-40SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.0V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 450ms reset timeout. It features open-drain active-low RESET output and operates across –40°C to +85°C in battery-powered instrumentation and portable embedded systems.
For engineers reviewing the APX803L40-40SA-7 datasheet, APX803L40-40SA-7 pinout, APX803L40-40SA-7 application, or APX803L40-40SA-7 equivalent, this device supports critical power-monitoring decisions in low-quiescent-current designs where reset timing precision, thermal stability, and SOT23 footprint compatibility are essential.
Technical Context
The APX803L40-40SA-7 integrates a precision bandgap reference and comparator with built-in hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its internal fixed 4.0V threshold eliminates external resistor networks and enables deterministic reset assertion at VCC < 4.0V and release at VCC > 4.06V (1.5% accuracy).
Reset timing is governed by an on-chip RC network delivering a nominal 450ms active timeout (292–608ms over temperature), with propagation delay under 20µs from VCC drop to RESET assertion. The open-drain output supports flexible pull-up configurations up to 5.5V and sinks ≥3.5mA at VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.0V ±1.5% - ensures reliable µP reset initiation when main supply falls below system-safe operating level |
| Supply Current | 1.0µA typical - imposes negligible load on coin-cell or energy-harvested power rails |
| Reset Timeout | 450ms nominal (292–608ms) - provides sufficient hold time for complete µP initialization and peripheral stabilization |
| Propagation Delay | <20µs - guarantees rapid fault response without compromising system timing margins |
| Output Type | Open-drain, active-low - enables wired-OR reset bus sharing and logic-level translation via external pull-up |
| Operating Temp | –40°C to +85°C - validated for industrial and extended-temperature portable equipment environments |
| Hysteresis | 0.01×VTH (40mV) - prevents chatter during slow-rising VCC transitions near threshold |
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 | Reference ground return path; must be low-impedance connection to system common |
| 2 | RESET | Open-drain active-low reset output; requires external pull-up to host logic rail (e.g., 3.3V) |
| 3 | VCC | Power input pin; monitors supply voltage directly; operates from 0.9V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Fixed 4.0V threshold and 450ms timeout eliminate resistors, capacitors, and layout area |
| High threshold accuracy | ±1.5% over temperature ensures consistent reset point across –40°C to +85°C without calibration |
| Ultra-low quiescent current | 1.0µA typ. enables multi-year operation on single CR2032 cell in always-on monitoring applications |
| Fast reset assertion | <20µs delay guarantees immediate fault capture before µP executes unstable instructions |
| Robust ESD protection | ±4000V HBM rating protects against handling damage in automated assembly and field service |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous environmental sensing with BLE wake-up and periodic transmission. IC Role / Device Role / Timing Role: Monitors Li-SOCl₂ primary cell voltage; asserts RESET if VBAT drops below 4.0V to prevent corrupted sensor reads or radio transmission. Use Value: Prevents firmware crash and data loss during end-of-life battery sag while consuming only 1µA between measurements. |
Use Scenario: DIN-rail mounted digital input module powered from 24VDC supply with local 3.3V LDO. IC Role / Device Role / Timing Role: Supervises 3.3V rail feeding FPGA configuration memory and communication interface; holds system in reset until stable post-power-up. Use Value: Ensures deterministic FPGA configuration and UART initialization via guaranteed 450ms reset pulse, eliminating boot failures. |
| Medical Wearable ECG Patch | Smart Energy Meter MCU Subsystem |
Use Scenario: Disposable patch with ultra-low-power analog front-end and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Detects brownout on regulated 1.8V core supply; generates clean reset signal to halt ADC sampling and preserve SRAM contents. Use Value: Maintains clinical data integrity during transient dips caused by RF burst transmission or battery impedance rise. |
Use Scenario: Two-way AMI meter with metrology SoC, secure bootloader, and isolated RS-485 PHY. IC Role / Device Role / Timing Role: Validates 5.0V auxiliary rail powering real-time clock and tamper-detection circuitry; resets security subsystem if voltage sags. Use Value: Enforces cryptographic key retention and tamper log validity by ensuring secure boot sequence only proceeds after full rail stabilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms default timeout, 1.6µA supply current | Designed for lower-voltage µP cores; lacks 4.0V option and longer timeout variants | Select when supervising 3.3V domains with tighter timing budgets and higher current tolerance |
| MAX809SEUR+T | 4.0V threshold, 140ms timeout, 10µA supply current, SOT23-3 | Higher quiescent current limits battery life; no 450ms option for slow-start systems | Choose only for legacy designs requiring pin-for-pin replacement with relaxed power constraints |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L40-40SA-7 uniquely delivers 4.0V detection with industry-leading 1µA current and configurable long-duration reset-making it optimal for next-generation portable and energy-constrained industrial controllers.
Availability
APX803L40-40SA-7 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, industrial PLC I/O modules, and medical wearable devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for APX803L40-40SA-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 across Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.
The APX803L series belongs to Diodes' precision power-supervision product line, engineered specifically for ultra-low-power microprocessor reset applications in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for APX803L40-40SA-7?
The APX803L40-40SA-7 has a factory-trimmed fixed threshold of 4.0V with ±1.5% accuracy over –40°C to +85°C. This means the actual trip point falls between 3.94V and 4.06V at +25°C, and remains within ±1.5% across its full operating temperature range per datasheet DS38171 Rev. 3-2.
Can APX803L40-40SA-7 drive a 10kΩ pull-up resistor to 5V?
Yes. The open-drain RESET output sinks ≥3.5mA at VOL ≤ 0.4V (tested at VCC = VTH – 0.2V), allowing reliable low-state operation with a 10kΩ pull-up to 5V (IPULLUP = 0.5mA). Total sink current remains well within the 20mA absolute maximum rating.
Does APX803L40-40SA-7 require an input capacitor on VCC?
No external capacitor is required for basic operation. However, a 100nF ceramic decoupling capacitor placed close to the VCC and GND pins is recommended per the typical application circuit in DS38171 to suppress high-frequency noise that could affect threshold stability during fast transients.
Is APX803L40-40SA-7 qualified for automotive applications?
No. APX803L40-40SA-7 is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade alternatives such as the APX803L40-40SA-7Q (with Q suffix) for applications requiring PPAP and IATF 16949 compliance.
APX803L40-40SA-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:
- 4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 292ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L40-40SA-7 FAQ
1.How can I place an order for APX803L40-40SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-40SA-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 APX803L40-40SA-7 reliable?
The price and inventory of APX803L40-40SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-40SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-40SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-40SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-40SA-7?
APX803L40-40SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-40SA-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 APX803L40-40SA-7?
For technical support, including APX803L40-40SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-40SA-7 requirements.
6.How does Aetrix verify that APX803L40-40SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-40SA-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 APX803L40-40SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-40SA-7?
All APX803L40-40SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-40SA-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 APX803L40-40SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-40SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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