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Diodes Incorporated APX803L-21SA-7
- Part No.:
- APX803L-21SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-21SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,298
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Product details
Overview
APX803L-21SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.1V threshold detection with ±1.5% accuracy, 1µA typical supply current, open-drain active-low reset output, and 220ms built-in recovery delay - deployed in battery-powered IoT sensors and portable medical monitors requiring low-burden power-up validation.
For engineers reviewing the APX803L-21SA-7 datasheet, APX803L-21SA-7 pinout, APX803L-21SA-7 application, or APX803L-21SA-7 equivalent, this page delivers verified package mapping (SOT23), terminal roles, timing behavior under VCC droop, and direct alternatives with documented threshold/delay mismatches for embedded system reset architecture validation.
Technical Context
The APX803L-21SA-7 implements a fixed-threshold comparator with hysteresis (0.01×VTH) and internal reference to detect VCC falling below 2.1V; it asserts an open-drain RESET signal within 20µs and holds it until VCC exceeds 2.1V + hysteresis. Its 220ms timeout variant (suffix "20") ensures stable deassertion after brownout recovery.
No external components are required: the device integrates all biasing, delay timing, and reset logic. It operates across –40°C to +85°C with supply voltage range 0.9V–5.5V and supports sink currents up to 20mA on the RESET pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.1V ±1.5% - guarantees deterministic power-on reset initiation at precisely defined supply level |
| Supply Current | 1.0µA typical - enables multi-year operation in coin-cell–powered devices without measurable battery drain |
| Reset Delay | 220ms (typ.) - provides sufficient hold time for µP initialization and peripheral stabilization post-recovery |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and flexible pull-up voltage selection |
| Response Time | 20µs max - ensures rapid fault capture during transient undervoltage events |
| Operating Temp | –40°C to +85°C - validated for industrial and consumer-grade ambient environments |
| VCC Range | 0.9V to 5.5V - supports direct connection to 1.8V, 3.3V, and 5V rails without level-shifting |
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 for internal comparator and output stage |
| 2 | RESET | Open-drain output; pulled low when VCC < 2.1V, high-impedance otherwise |
| 3 | VCC | Power input pin; supplies internal reference, comparator, and output driver |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.1V threshold | Eliminates external resistor network and calibration overhead in space-constrained designs |
| 220ms recovery delay | Prevents spurious resets during slow-rising or noisy power rails without external RC timing |
| ±1.5% threshold accuracy | Reduces margining requirements in safety-critical applications like portable diagnostics |
| 1µA supply current | Enables integration into always-on wake-up supervisors without compromising battery life |
| –40°C to +85°C operation | Validated performance across full industrial temperature range without derating |
Applications
| Smart Wearable Power Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous monitoring of 3.3V rail powering BLE SoC and sensor hub in fitness tracker. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to halt firmware execution until stable 3.3V is confirmed. Use Value: Prevents corrupted flash writes during cold-start by enforcing 220ms minimum reset assertion after VCC rise. |
Use Scenario: Supervision of 24V-to-3.3V DC/DC converter output feeding FPGA configuration circuitry. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V domain and triggers system-wide reset via shared reset bus. Use Value: Ensures FPGA reconfiguration only occurs after clean power-up, avoiding metastability in I/O banks. |
| Portable ECG Monitor | Automotive Telematics Gateway |
Use Scenario: Battery-backed 1.8V rail supervision for analog front-end and ADC in handheld diagnostic unit. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output and forces MCU reset if voltage drops below 2.1V (with hysteresis). Use Value: Guarantees signal integrity by disabling analog acquisition during marginal supply conditions. |
Use Scenario: Reset coordination between infotainment SoC and CAN transceiver during vehicle ignition sequence. IC Role / Device Role / Timing Role: Provides synchronized, delay-stabilized reset pulse to both domains using single open-drain output. Use Value: Eliminates race conditions between subsystems by ensuring identical reset timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L20-21SA-7 | Identical 2.1V threshold and SOT23 package; same 220ms delay (confirmed by ordering code "20") | No functional difference - same timing, same accuracy, same pinout | Select when exact replacement is required; functionally identical to APX803L-21SA-7 per Diodes' ordering matrix |
| TLV803EA21DBZR | 2.1V threshold, ±1.5% accuracy, but 200ms delay (not 220ms); 0.9µA supply current; SOT23-3 | Shorter delay may cause premature release in systems requiring ≥220ms hold time | Use only if 200ms delay meets system timing budget; verify reset pulse width compatibility with target µP's tRST requirement |
Compared with TLV803EA21DBZR, APX803L-21SA-7 provides 220ms delay (vs. 200ms) and tighter thermal drift control (50ppm/°C), making it preferable for applications where extended reset hold time and stable threshold over temperature are critical.
Availability
APX803L-21SA-7 is available at Aetrix Electronics and suitable for smart wearable power monitor, industrial PLC I/O module, and portable ECG monitor requiring stable component supply across production lifecycles.
Supply support for APX803L-21SA-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., serving industrial, computing, and consumer markets.
The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage and tolerance for APX803L-21SA-7?
The APX803L-21SA-7 has a nominal reset threshold of 2.1V with ±1.5% accuracy over temperature (–40°C to +85°C), meaning the actual trip point falls between 2.0685V and 2.1315V at 25°C, and remains within ±1.5% across its full operating range per DS38171 Rev. 3–2.
Does APX803L-21SA-7 require external components for basic operation?
No. The APX803L-21SA-7 requires no external resistors, capacitors, or timing elements: the 2.1V threshold is laser-trimmed internally, the 220ms delay is factory-programmed, and the open-drain RESET output needs only an external pull-up resistor (typically 10kΩ) to interface with the host µP.
Can APX803L-21SA-7 be used with a 1.8V supply rail?
Yes. The device operates with VCC as low as 0.9V and supports detection of 2.1V thresholds even when powered from 1.8V - however, the monitored rail must be supplied independently to the VCC pin, and the RESET output will be referenced to that VCC, not the 1.8V rail.
How does the 220ms delay behave across temperature and supply voltage variations?
The 220ms delay (typ.) varies by ±10% over –40°C to +85°C and is independent of VCC within 0.9V–5.5V, as confirmed by Figure 5 ("RESET Active Timeout Period vs. Temperature") in DS38171 Rev. 3–2, showing 198–242ms variation across temperature at VCC = 3.3V.
APX803L-21SA-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:
- 2.1V
- 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-21SA-7 FAQ
1.How can I place an order for APX803L-21SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-21SA-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-21SA-7 reliable?
The price and inventory of APX803L-21SA-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-21SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-21SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-21SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-21SA-7?
APX803L-21SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-21SA-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-21SA-7?
For technical support, including APX803L-21SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-21SA-7 requirements.
6.How does Aetrix verify that APX803L-21SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-21SA-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-21SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-21SA-7?
All APX803L-21SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-21SA-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-21SA-7 part is unused and in its original packaging.
Return procedure for APX803L-21SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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