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Diodes Incorporated APX803L40-29SA-7
- Part No.:
- APX803L40-29SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-29SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,346
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Product details
Overview
APX803L40-29SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.9V threshold detection with ±1.5% accuracy, 450ms 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 APX803L40-29SA-7 datasheet, APX803L40-29SA-7 pinout, APX803L40-29SA-7 application, or APX803L40-29SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and compatibility with low-voltage microcontrollers operating down to 0.9V supply.
Technical Context
The APX803L40-29SA-7 implements a precision bandgap-based voltage reference with built-in hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its internal comparator triggers an active-low reset signal when VCC drops below 2.9V and holds it until VCC exceeds 2.9V + hysteresis.
This variant configures fixed 450ms reset timeout (typ. 450ms at +25°C, 292–608ms over -40°C to +125°C), operates from 0.9V to 5.5V supply, and features fast 20µs response time from VCC drop to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.9V ±1.5% - ensures reliable brown-out detection for 3.0V/3.3V systems with margin against noise-induced false resets |
| Reset Timeout Delay | 450ms (typ.) - provides sufficient hold time for full µP initialization and peripheral stabilization after power-up |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables multi-year operation in coin-cell-powered wearables without measurable battery drain |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architectures and flexible pull-up voltage selection (up to 5.5V) |
| Response Time | 20µs - guarantees rapid fault capture before µP executes corrupted instructions during voltage sag |
| Operating Temperature | -40°C to +85°C - validated for industrial-grade embedded control in automotive cabin modules and smart meters |
| Threshold Tempco | 50ppm/°C - maintains <±20mV drift across full temperature range, critical for stable reset behavior in unregulated environments |
Pinout & Package
SOT23-3 package (3-pin, 1.3mm × 2.9mm, 0.95mm height) with gull-wing leads; RoHS-compliant, halogen-free, lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path; must be connected directly to system power plane to minimize noise coupling into threshold detection |
| 2 | RESET | Open-drain output; requires external pull-up resistor (typically 10kΩ) to host VCC or higher logic rail; sinks up to 3.5mA |
| 3 | VCC | Power input; supplies internal reference and comparator; accepts 0.9V–5.5V; decoupling capacitor (100nF) required at pin |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Internal voltage reference, comparator, and timing circuit eliminate need for resistors, capacitors, or trimming |
| High threshold accuracy | ±1.5% over temperature ensures consistent reset point across environmental stress without calibration |
| Low supply current | 1µA typical draw allows integration into always-on subsystems without compromising battery life |
| Fast reset assertion | 20µs propagation delay enables detection of transient dips shorter than µP clock cycles |
| Four factory-set delay options | 0ms/55ms/220ms/450ms variants support diverse boot sequencing requirements without firmware overhead |
Applications
| Smart Wearable Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous ECG monitoring patch powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output; asserts reset if voltage sags below 2.9V during RF burst, preventing memory corruption. Use Value: 1µA quiescent current extends battery life beyond 18 months; 450ms timeout ensures complete ADC and radio initialization before firmware resumes. |
Use Scenario: DIN-rail mounted digital input module operating in factory ambient (-25°C to +70°C). IC Role / Device Role / Timing Role: Supervises 3.3V FPGA configuration supply; holds reset until rail stabilizes post-power-on and remains asserted during line transients. Use Value: ±1.5% threshold accuracy and 50ppm/°C tempco guarantee no spurious resets across temperature extremes; open-drain output interfaces directly to FPGA's asynchronous reset pin. |
| Portable Medical Infusion Pumps | Automotive Body Control Modules |
Use Scenario: Battery-backed infusion pump with dual Li-ion cells (6.0–8.4V) and 3.3V system rail. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse due to motor startup surge; generates clean reset pulse to MCU and motor driver ASIC. Use Value: 20µs response captures sub-millisecond dips; 450ms timeout prevents premature release during sustained voltage dip caused by high-current actuation. |
Use Scenario: Door module controlling window lift, mirror fold, and interior lighting using 12V battery and 5.0V regulator. IC Role / Device Role / Timing Role: Supervises 5.0V microcontroller supply; asserts reset during cold-crank (6.5V) and load-dump (28V) events per ISO 7637-2. Use Value: Absolute max rating of 6.0V on VCC and 6.0V on RESET pin enables direct connection to regulated rail without clamping diodes; robust ESD (±4kV HBM) withstands automotive EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803E29DBZR | 2.9V threshold, 200ms delay, 0.5µA supply current, same SOT23-3 package | Lacks 450ms option; optimized for ultra-low-power apps where shorter delay suffices | Select when system boot sequence completes in <200ms and lowest possible current is mandatory |
| MAX809SEUR+T | 2.93V threshold, 140ms delay, 12µA supply current, SOT23-3 | Higher current draw and tighter 140ms delay limit suitability to simpler µC systems | Choose only if legacy design reuse or MAXIM ecosystem integration is required |
Compared with TLV803E29DBZR and MAX809SEUR+T, the APX803L40-29SA-7 uniquely balances 450ms delay headroom, 1µA current, and ±1.5% accuracy-making it optimal for safety-critical portable electronics where extended reset hold time and minimal battery impact are jointly essential.
Availability
APX803L40-29SA-7 is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and automotive body electronics requiring stable component supply with guaranteed long-term manufacturability.
Supply support for APX803L40-29SA-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 manufacturing certified to IATF 16949 and quality systems compliant with AEC-Q100/101 standards.
The APX803L series targets ultra-low-power supervisory functions in space-constrained, battery-operated systems-designed specifically to replace discrete reset circuits while delivering superior accuracy, temperature stability, and supply current efficiency.
FAQ
What is the absolute maximum VCC rating for APX803L40-29SA-7?
The absolute maximum VCC rating is 6.0V. Exceeding this voltage-even momentarily-may cause permanent damage. The device operates reliably within 0.9V to 5.5V per recommended conditions, and its internal protection circuitry does not extend beyond the 6.0V absolute limit specified in the datasheet.
Can APX803L40-29SA-7 drive a 10kΩ pull-up to 5V?
Yes. With VOL ≤ 0.4V at ISINK = 3.5mA, the output can easily drive a 10kΩ pull-up to 5V, resulting in ~0.5mA sink current and <0.5V logic-low voltage-well within specification. This configuration is verified in the Typical Applications Circuit on page 3 of DS38171 Rev. 3-2.
Is the 450ms reset timeout affected by temperature?
Yes. The timeout varies from 292ms at -40°C to 608ms at +125°C (typical). The datasheet provides a graph on page 5 showing monotonic increase with temperature; design margin must account for this variation when timing µP boot sequences across full operating range.
Does APX803L40-29SA-7 require an input capacitor?
Yes. A 100nF ceramic capacitor is required between VCC and GND, placed as close as possible to the device pins. This decouples high-frequency noise and ensures stable internal reference operation-omission risks erratic reset behavior or failure to assert during fast transients, as confirmed in the Typical Applications Circuit (page 3).
APX803L40-29SA-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:
- 2.9V
- 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
APX803L40-29SA-7 FAQ
1.How can I place an order for APX803L40-29SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-29SA-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 APX803L40-29SA-7 reliable?
The price and inventory of APX803L40-29SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-29SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-29SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-29SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-29SA-7?
APX803L40-29SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-29SA-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 APX803L40-29SA-7?
For technical support, including APX803L40-29SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-29SA-7 requirements.
6.How does Aetrix verify that APX803L40-29SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-29SA-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 APX803L40-29SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-29SA-7?
All APX803L40-29SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-29SA-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 APX803L40-29SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-29SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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