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Diodes Incorporated APX803L-31SA-7
- Part No.:
- APX803L-31SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-31SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:710
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Product details
Overview
APX803L-31SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.1V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 220ms reset timeout. It features open-drain active-low RESET output and operates across -40°C to +85°C ambient range in battery-powered IoT sensors and portable medical devices.
For engineers reviewing the APX803L-31SA-7 datasheet, APX803L-31SA-7 pinout, APX803L-31SA-7 application, or APX803L-31SA-7 equivalent, this page delivers verified electrical parameters, SOT23 package terminal mapping, real-world supervisory use cases, and validated alternative parts for power-on reset design in space-constrained embedded systems.
Technical Context
The APX803L-31SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its comparator continuously monitors VCC against a fixed 3.1V threshold and asserts RESET low within 20µs when VCC drops below that level.
Reset assertion remains active until VCC exceeds 3.1V by at least the hysteresis margin, then holds for a factory-programmed 220ms timeout before releasing-ensuring stable processor initialization after brownout recovery in microcontroller-based edge nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.1V ±1.5% - ensures reliable reset activation at defined supply rail margin for 3.3V systems |
| Supply Current | 1.0µA typical - enables multi-year operation on coin-cell batteries without compromising supervision integrity |
| Reset Timeout | 220ms - provides sufficient hold time for full microcontroller boot sequence and peripheral stabilization |
| Response Time | 20µs - guarantees rapid fault detection to prevent corrupted firmware execution during transient dips |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architecture and flexible pull-up voltage selection |
| Operating Range | VCC = 0.9V to 5.5V - accommodates wide-input LDO outputs and direct connection to Li-ion or 3.3V/5V rails |
| Temperature Range | -40°C to +85°C - qualified for industrial and consumer-grade portable equipment deployment |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm × 1.1mm body, gull-wing leads, RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and voltage reference; must be low-impedance |
| 2 | RESET | Open-drain output; sinks up to 20mA; requires external pull-up for logic-high state during normal operation |
| 3 | VCC | Power input pin; supplies internal circuitry and powers the voltage reference; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated reference, comparator, and delay timer eliminate BOM cost and PCB area for basic reset functions |
| High threshold accuracy | ±1.5% over temperature ensures deterministic reset behavior without calibration or trimming |
| Ultra-low quiescent current | 1.0µA typ. enables integration into always-on subsystems without measurable battery drain impact |
| Factory-set delay options | 220ms timeout matches common MCU boot timing requirements-no external RC network needed |
| Robust ESD protection | ±4000V HBM rating allows safe handling and assembly in standard manufacturing environments |
Applications
| Wearable Health Monitor | Smart Home Sensor Node |
|---|---|
Use Scenario: Continuous ECG sampling powered by CR2032 battery with BLE transmission every 30 seconds. IC Role / Device Role / Timing Role: Monitors 3.0V LDO output feeding MCU and analog front-end; asserts RESET if voltage sags below 3.1V during RF burst. Use Value: Prevents data corruption and flash write errors during brownout, extending field reliability beyond 2 years per battery. |
Use Scenario: Battery-operated temperature/humidity sensor reporting via Zigbee to hub every 5 minutes. IC Role / Device Role / Timing Role: Supervises 3.3V system rail; holds MCU in reset until regulated supply stabilizes post cold-start or wake-from-sleep. Use Value: Eliminates spurious wakeups and failed sensor reads caused by insufficient power ramp-up time. |
| Industrial PLC I/O Module | Portable Diagnostic Tool |
Use Scenario: DIN-rail mounted module with isolated 24V-to-3.3V conversion powering ARM Cortex-M4 controller. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V domain due to input transients or aging DC-DC converter drift. Use Value: Guarantees clean restart after line disturbance, avoiding watchdog timeouts and unsafe I/O state transitions. |
Use Scenario: Handheld device with dual-battery backup (Li-ion + coin cell) for emergency diagnostics in automotive service bays. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination between main and backup power domains during switchover. Use Value: Maintains deterministic boot sequence regardless of source transition timing or voltage droop magnitude. |
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 threshold, 350ms default delay, 2.5µA supply current, same SOT23-6 footprint but different pinout | Requires external resistor for delay adjustment; lacks factory-trimmed 220ms option | Select when longer timeout or adjustable delay is preferred over fixed 220ms and ultra-low 1µA current |
| MAX809SEUR+T | 3.08V threshold (±2.5%), 140ms delay, 10µA supply current, SOT23-3 compatible pinout | Higher quiescent current reduces battery life in always-on designs; lower accuracy increases risk of marginal reset | Choose only if legacy MAX809 footprint compatibility is mandatory and 1µA current is not critical |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L-31SA-7 delivers superior energy efficiency and tighter threshold tolerance in identical SOT23-3 packaging-making it optimal for long-life, high-reliability reset supervision where 3.1V trip point and 220ms hold time are design requirements.
Availability
APX803L-31SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, industrial PLC I/O modules, and portable diagnostic tools requiring stable component supply with guaranteed long-term continuity.
Supply support for APX803L-31SA-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 US, serving industrial, computing, and consumer markets.
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 applications.
FAQ
What is the exact reset threshold voltage for APX803L-31SA-7?
The APX803L-31SA-7 has a factory-trimmed nominal reset threshold of 3.10V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and cannot be adjusted externally; it is verified per DS38171 Rev. 3–2 Section 5 Electrical Characteristics.
Can APX803L-31SA-7 drive a 10kΩ pull-up resistor directly?
Yes-the open-drain RESET output can sink ≥3.5mA at VOL ≤0.4V (per datasheet test condition), supporting standard 10kΩ pull-ups to 3.3V or 5V. At 3.3V, this yields ~0.33mA sink current, well within its 20mA absolute maximum rating and ensuring robust logic-low assertion.
Does APX803L-31SA-7 require an input capacitor on VCC?
Yes-a 100nF ceramic decoupling capacitor is recommended between VCC and GND, placed as close as possible to the device pins. This stabilizes the internal reference and prevents false resets during fast transients, as shown in the Typical Applications Circuit on page 3 of DS38171.
Is APX803L-31SA-7 qualified for automotive applications?
No-APX803L-31SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the APX803L-A series (e.g., APX803L-31SA-7T), which undergoes additional qualification testing and is manufactured in IATF 16949-certified facilities.
APX803L-31SA-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:
- 3.1V
- 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-31SA-7 FAQ
1.How can I place an order for APX803L-31SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-31SA-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-31SA-7 reliable?
The price and inventory of APX803L-31SA-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-31SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-31SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-31SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-31SA-7?
APX803L-31SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-31SA-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-31SA-7?
For technical support, including APX803L-31SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-31SA-7 requirements.
6.How does Aetrix verify that APX803L-31SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-31SA-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-31SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-31SA-7?
All APX803L-31SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-31SA-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-31SA-7 part is unused and in its original packaging.
Return procedure for APX803L-31SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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