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Diodes Incorporated APX803L40-35SA-7
- Part No.:
- APX803L40-35SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-35SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
APX803L40-35SA-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, 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23 package-used in battery-powered IoT sensors and portable medical devices.
For engineers reviewing the APX803L40-35SA-7 datasheet, APX803L40-35SA-7 pinout, APX803L40-35SA-7 application, or APX803L40-35SA-7 equivalent, key selection criteria include reset threshold tolerance, delay time stability over temperature, low-quiescent-current operation in sleep-mode systems, and compatibility with 1.8–5.5V supply rails in space-constrained embedded designs.
Technical Context
The APX803L40-35SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during power-up/down transitions. Its internal comparator continuously monitors VCC against a fixed 3.5V threshold and asserts RESET when VCC drops below that level.
Reset assertion remains active until VCC exceeds 3.5V + hysteresis (≈3.535V), followed by a guaranteed 450ms timeout before deassertion. The open-drain output supports wired-OR configuration and external pull-up to any logic rail up to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.5V ±1.5% - ensures reliable µP reset initiation at defined supply margin |
| Supply Current | 1.0µA (typ.) - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 450ms (typ.) - satisfies ARM Cortex-M and RISC-V MCU minimum reset pulse width requirements |
| Response Time | 20µs - guarantees fast fault detection before system state corruption |
| Output Type | Open-drain, active-low - allows flexible logic-level translation and multi-device reset bus sharing |
| Operating Voltage | 0.9V to 5.5V - supports direct connection to 1.8V, 3.3V, and 5V domains without level-shifting |
| Temp Range | -40°C to +85°C - validated for industrial-grade portable equipment operation |
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 bias and output sink current; must connect to system ground plane |
| 2 (RESET) | Open-Drain Reset Output | Active-low signal asserted when VCC < 3.5V; requires external pull-up resistor (typically 10kΩ to VCC or higher rail) |
| 3 (VCC) | Supply Input | Powers internal circuitry and senses monitored voltage; decoupling capacitor (100nF) recommended adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated reference, comparator, and delay timer eliminate BOM cost and layout area for discrete supervisor solutions |
| High threshold accuracy | ±1.5% over temperature ensures deterministic reset behavior across full operating range without calibration |
| Ultra-low quiescent current | 1.0µA typ. minimizes standby power loss in always-on edge nodes and wearables |
| Four factory-set delay options | 450ms timeout matches boot-time requirements of modern MCUs and avoids premature release during brown-out recovery |
| Robust ESD protection | ±4000V HBM rating enables handling in standard assembly environments without special ESD controls |
Applications
| Smart Wearable Power Monitoring | Industrial Sensor Node Supervision |
|---|---|
Use Scenario: Continuous heart-rate monitor powered by CR2032 battery with BLE SoC. IC Role / Device Role / Timing Role: Voltage detector asserting RESET to hold SoC in reset until stable 3.3V LDO output reaches 3.5V threshold. Use Value: Prevents firmware crash during cold-start by enforcing 450ms minimum reset hold time after battery insertion. |
Use Scenario: Wireless vibration sensor deployed in factory machinery with 10-year battery life target. IC Role / Device Role / Timing Role: Monitors 3.3V supply from energy-harvesting PMIC; triggers hardware reset if input dips below 3.5V due to transient load. Use Value: 1µA supply current extends operational lifetime; ±1.5% threshold ensures consistent trip point despite aging and temperature drift. |
| Medical Diagnostic Handheld | Automotive Telematics Module |
Use Scenario: Portable blood glucose meter using dual alkaline cells (1.5V × 2) and buck converter. IC Role / Device Role / Timing Role: Detects end-of-life battery sag (<3.5V) and forces controlled shutdown before data corruption occurs. Use Value: 20µs response time captures rapid voltage collapse; open-drain output interfaces directly to microcontroller's NMI pin. |
Use Scenario: CAN-connected OBD-II adapter with GPS and cellular modem operating in vehicle 12V system. IC Role / Device Role / Timing Role: Supervises 3.3V domain powering baseband processor; asserts RESET during ignition-cycle voltage dip (e.g., cranking). Use Value: 450ms timeout accommodates typical automotive cranking transients while avoiding false resets during brief dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EA35DBZR | 3.5V threshold, 200ms timeout, 0.5µA IQ, SOT23-3 | Lacks 450ms option; tighter ±0.5% accuracy but higher cost | Select when ultra-low IQ dominates design priority and shorter reset hold is acceptable |
| MAX809SEUR+T | 3.08V threshold, 140ms timeout, 12µA IQ, SOT23-3 | Higher supply current; fixed 3.08V threshold incompatible with 3.5V system margin | Only suitable if redesigning supply rail or accepting reduced noise margin |
Compared with TLV803EA35DBZR and MAX809SEUR+T, the APX803L40-35SA-7 uniquely delivers 450ms timing at 1µA IQ with 3.5V threshold-enabling drop-in replacement in legacy designs requiring extended reset hold without compromising battery life.
Availability
APX803L40-35SA-7 is available at Aetrix Electronics and suitable for smart wearable power monitoring, industrial sensor node supervision, medical diagnostic handhelds, and automotive telematics modules requiring stable component supply across long-lifecycle programs.
Supply support for APX803L40-35SA-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, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200 for automotive applications.
The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for ultra-low-power supervisory functions in battery-critical and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for APX803L40-35SA-7?
The APX803L40-35SA-7 has a factory-trimmed reset threshold of 3.5V with ±1.5% accuracy over -40°C to +85°C ambient temperature. This means the actual trip point falls between 3.4475V and 3.5525V at 25°C, and maintains specified tolerance across the full operating range per DS38171 Rev. 3-2 Electrical Characteristics table.
Can APX803L40-35SA-7 be used with a 1.8V supply rail?
Yes-the device operates down to 0.9V supply and monitors VCC directly, so it can supervise 1.8V systems. However, its 3.5V threshold means it will only assert RESET when the 1.8V rail collapses far below specification; it is intended for monitoring rails ≥3.5V or used with external resistive dividers to scale higher voltages down to 3.5V.
Does the 450ms reset timeout vary with temperature or supply voltage?
Per DS38171 Figure 5, the 450ms timeout (for APX803L40 variant) varies by ≤±10% from -40°C to +125°C, remaining within 405–495ms. It shows negligible dependence on VCC between 1.02×VTH and 5.5V, making it highly stable for deterministic system boot sequencing.
Is a pull-up resistor required on the RESET pin?
Yes-an external pull-up resistor is mandatory because the RESET pin is open-drain. Typical values range from 4.7kΩ to 100kΩ, connected to the same rail as the monitored VCC or a higher logic rail (≤5.5V). Without it, the output cannot transition high and the supervised device will remain held in reset indefinitely.
APX803L40-35SA-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:
- 3.5V
- 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
APX803L40-35SA-7 FAQ
1.How can I place an order for APX803L40-35SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-35SA-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 APX803L40-35SA-7 reliable?
The price and inventory of APX803L40-35SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-35SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-35SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-35SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-35SA-7?
APX803L40-35SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-35SA-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 APX803L40-35SA-7?
For technical support, including APX803L40-35SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-35SA-7 requirements.
6.How does Aetrix verify that APX803L40-35SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-35SA-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 APX803L40-35SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-35SA-7?
All APX803L40-35SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-35SA-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 APX803L40-35SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-35SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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