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Diodes Incorporated APX803L40-33SA-7
- Part No.:
- APX803L40-33SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-33SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
APX803L40-33SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in embedded digital systems. It features a fixed 3.3V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, and open-drain active-low RESET output in SOT23-3 package - deployed in battery-powered instrumentation and portable microcontroller systems.
For engineers reviewing the APX803L40-33SA-7 datasheet, APX803L40-33SA-7 pinout, APX803L40-33SA-7 application, or APX803L40-33SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation in sleep-mode systems, and compatibility with 3.3V logic-level microprocessor reset inputs.
Technical Context
The APX803L40-33SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its comparator drives an open-drain NMOS output stage, requiring an external pull-up for logic-level compatibility.
Reset assertion occurs when VCC drops below 3.3V (–1.5% to +1.5%), and release requires VCC to exceed the hysteresis-adjusted rising threshold. The 450ms timeout is factory-programmed and stable across –40°C to +85°C ambient range, with <50 ppm/°C threshold drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.3V ±1.5% - ensures reliable reset initiation at nominal 3.3V rail without false triggering due to noise or tolerance stack-up |
| Supply Current | 1.0µA typical - enables multi-year operation in coin-cell–powered devices without measurable battery drain |
| Reset Timeout | 450ms (min–max: 292–608ms) - guarantees sufficient hold time for full µP initialization and peripheral stabilization |
| 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 max - provides fast fault detection critical for real-time safety-critical subsystems |
| Operating Voltage | 0.9V to 5.5V - allows use with sub-1V logic rails and legacy 5V systems without level-shifting |
| Temperature Range | –40°C to +85°C - validated for industrial-grade embedded applications including automotive cabin electronics |
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 circuitry; must be connected directly to system ground plane for accurate threshold sensing |
| 2 (RESET) | Open-drain reset output | Active-low signal asserted when VCC < 3.3V; requires external pull-up resistor (typically 10kΩ to 3.3V or 5V) |
| 3 (VCC) | Power supply input | Monitored voltage rail; powers internal circuitry and defines detection reference - no separate reference pin required |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V threshold | Factory-trimmed bandgap reference eliminates need for external resistive divider or calibration |
| 450ms reset timeout | Internally generated delay ensures µP reset pulse meets ARM Cortex-M and RISC-V boot requirements |
| 1µA supply current | Enables integration into always-on wake-up monitors without compromising system standby power budget |
| ±1.5% threshold accuracy | Reduces design margin overhead versus ±3% alternatives, enabling tighter VCC regulation specs |
| No external components | Self-contained solution reduces BOM count, PCB area, and qualification effort for high-reliability designs |
Applications
| Industrial Sensor Node | Medical Wearable |
|---|---|
Use Scenario: Battery-powered environmental sensor transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output to assert reset if brownout occurs during RF transmission burst. Use Value: Prevents corrupted firmware execution by guaranteeing clean µC restart before next sampling cycle. | Use Scenario: ECG patch with ultra-low-power MCU entering deep-sleep between heartbeat detections. IC Role / Device Role / Timing Role: Supervises coin-cell–fed 3.3V supply; holds reset until battery recovers post-pulse load sag. Use Value: Eliminates spurious wakeups caused by transient voltage dip, extending usable battery life by >12%. |
| POS Terminal Controller | Smart Home Hub |
Use Scenario: Embedded Linux gateway powering USB peripherals and Wi-Fi module during boot sequence. IC Role / Device Role / Timing Role: Generates 450ms reset pulse synchronized to 3.3V rail stabilization after power-on. Use Value: Ensures DDR memory, Ethernet PHY, and PMIC all initialize fully before kernel start. | Use Scenario: Voice-controlled hub managing Zigbee, Matter, and Thread radios with shared 3.3V domain. IC Role / Device Role / Timing Role: Detects undervoltage on main 3.3V rail during simultaneous radio transmit events. Use Value: Triggers coordinated shutdown of all radios before voltage collapse corrupts flash memory writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Higher supply current (8µA typ), 200ms fixed delay, same 3.3V threshold and SOT23-6 package | Requires PCB redesign for 6-pin layout; less suitable for space-constrained wearables | Choose when longer production lifecycle visibility is prioritized over quiescent current |
| MAX6326UT33+T | 3.3V threshold, 1.6µA supply current, 1.1s timeout, SOT23-3 package, ±2.5% accuracy | Longer timeout may delay recovery in fast-cycle IoT edge nodes | Prefer where higher temperature range (–40°C to +125°C) is mandatory |
Compared with TPS3808G33DBVR and MAX6326UT33+T, the APX803L40-33SA-7 delivers the lowest quiescent current in identical SOT23-3 form factor while maintaining tight threshold accuracy - making it optimal for energy-harvesting and long-life battery applications where every nanoamp counts.
Availability
APX803L40-33SA-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, POS terminal controllers, and smart home hubs requiring stable component supply with guaranteed long-term availability.
Supply support for APX803L40-33SA-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 for industrial, computing, consumer, and communications markets.
The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-sensitive and space-constrained embedded systems.
FAQ
What is the exact reset timeout value for APX803L40-33SA-7?
The APX803L40-33SA-7 has a nominal reset timeout of 450ms, with a guaranteed minimum of 292ms and maximum of 608ms across temperature and process variation. This delay begins when VCC falls below the 3.3V threshold and ends when VCC rises above the hysteresis-adjusted release voltage.
Can APX803L40-33SA-7 monitor voltages other than 3.3V?
No - the "33" in the part number denotes a factory-fixed 3.3V detection threshold. The APX803L family offers discrete voltage options from 1.2V to 5.0V in 0.1V increments, but each variant is internally trimmed and not adjustable. For 2.5V monitoring, APX803L40-25SA-7 would be required.
Is an external pull-up resistor required on the RESET pin?
Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 4.7kΩ to 10kΩ) to the target logic voltage (e.g., 3.3V or 5V) is mandatory to generate a valid high-level signal during normal operation. No internal pull-up is provided.
Does APX803L40-33SA-7 support operation below 0.9V supply?
No - the absolute minimum operating supply voltage is 0.9V per the Recommended Operating Conditions table. Below this, the internal bandgap reference and comparator cannot function reliably, and reset behavior is undefined. It is not rated for sub-1V energy-harvesting rails.
APX803L40-33SA-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:
- 3.3V
- 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
APX803L40-33SA-7 FAQ
1.How can I place an order for APX803L40-33SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-33SA-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 APX803L40-33SA-7 reliable?
The price and inventory of APX803L40-33SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-33SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-33SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-33SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-33SA-7?
APX803L40-33SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-33SA-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 APX803L40-33SA-7?
For technical support, including APX803L40-33SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-33SA-7 requirements.
6.How does Aetrix verify that APX803L40-33SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-33SA-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 APX803L40-33SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-33SA-7?
All APX803L40-33SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-33SA-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 APX803L40-33SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-33SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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