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Diodes Incorporated APX803L40-18SA-7
- Part No.:
- APX803L40-18SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-18SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,845
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Product details
Overview
APX803L40-18SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 1.8 V threshold detection with ±1.5% accuracy, 450 ms reset timeout, 1 µA typical supply current, and open-drain active-low RESET output in SOT23 package - used in battery-powered IoT sensors and portable medical monitors to ensure reliable power-on reset sequencing.
For engineers reviewing the APX803L40-18SA-7 datasheet, APX803L40-18SA-7 pinout, APX803L40-18SA-7 application, or APX803L40-18SA-7 equivalent, this page delivers verified electrical parameters, validated SOT23 pin mapping, real-world use cases in low-power embedded systems, and confirmed alternative parts with documented timing and threshold differences.
Technical Context
The APX803L40-18SA-7 implements a fixed-threshold voltage monitoring circuit with internal 1.8 V reference and hysteresis of 0.01 × VTH, enabling stable reset assertion during supply brownouts. Its comparator-based architecture triggers within 20 µs when VCC drops below 1.8 V and holds RESET active for exactly 450 ms after recovery.
It operates across –40°C to +85°C ambient, supports 0.9–5.5 V supply range, and features an open-drain output capable of sinking 3.5 mA at 0.4 VOL, requiring no external pull-up for standard µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8 V ±1.5% - ensures accurate power-fail detection for 1.8 V logic rails without calibration. |
| Reset Timeout | 450 ms (typ.) - guarantees sufficient hold time for slow-ramping supplies in battery-backed systems. |
| Supply Current | 1.0 µA (typ.), 2.5 µA (max) - enables multi-year operation in coin-cell-powered devices. |
| Response Time | 20 µs - provides fast fault response before µP executes corrupted instructions. |
| Output Type | Open-drain, active-low - allows wired-OR reset bus sharing and compatibility with 1.2–5.5 V I/O domains. |
| Operating Temp | –40°C to +85°C - supports industrial-grade deployment in uncontrolled environments. |
| Hysteresis | 0.01 × VTH (≈18 mV) - prevents chatter during marginal supply conditions near threshold. |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3 mm × 2.9 mm footprint, 1.45 mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return for internal comparator and output stage. |
| 2 | RESET | Open-drain active-low reset signal; requires external pull-up to host VCC. |
| 3 | VCC | Power input pin; supplies internal bandgap reference and comparator (0.9–5.5 V range). |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained detection circuit eliminates RC timing networks and reduces BOM count by one part. |
| Fixed 1.8 V threshold | Factory-trimmed internal reference avoids manual resistor selection and layout sensitivity. |
| 450 ms reset timeout | Guaranteed minimum assertion period meets ARM Cortex-M and RISC-V boot loader timing requirements. |
| 1 µA supply current | Enables integration into always-on wake-up circuits without compromising battery life. |
| ±1.5% threshold accuracy | Meets tight margin requirements for 1.8 V core supplies with 10% tolerance envelopes. |
Applications
| Wearable Health Monitor | Smart Sensor Node |
|---|---|
Use Scenario: Continuous ECG sampling powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until regulated 1.8 V rail stabilizes post-battery insertion or cold start. Use Value: Prevents firmware crash during undervoltage conditions; 450 ms timeout accommodates slow LDO ramp-up. |
Use Scenario: LoRaWAN environmental sensor logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Monitors 1.8 V MCU core supply and triggers hardware reset if battery dips below safe operating level. Use Value: Eliminates software watchdog dependency; 1 µA quiescent current extends 10-year battery life target. |
| Industrial PLC I/O Module | Portable Diagnostic Instrument |
Use Scenario: DIN-rail mounted controller with isolated 1.8 V FPGA configuration rail. IC Role / Device Role / Timing Role: Detects brownout on FPGA VCCINT and asserts synchronous reset to prevent partial bitstream loading. Use Value: ±1.5% threshold ensures reliable detection despite 85°C ambient and PCB trace resistance. |
Use Scenario: Handheld ultrasound probe with rechargeable Li-ion and dual-voltage analog front-end. IC Role / Device Role / Timing Role: Supervises 1.8 V digital domain supply and coordinates power sequencing with analog bias rails. Use Value: Open-drain output interfaces directly to FPGA reset controller without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB18DBZR | 1.8 V threshold, 200 ms timeout, 0.5 µA ICC, SOT23-3 | Shorter timeout insufficient for slow-ramping LDOs in medical devices | Select when ultra-low current dominates over reset duration requirements |
| MAX809SEUR+T | 1.8 V threshold, 240 ms timeout, 10 µA ICC, SOT23-3 | Higher supply current reduces battery life in energy-constrained nodes | Choose only if legacy MAXIM design reuse mandates pin-for-pin compatibility |
Compared with TLV803EB18DBZR and MAX809SEUR+T, the APX803L40-18SA-7 uniquely balances 450 ms guaranteed reset hold time with sub-µA quiescent consumption - critical for battery longevity in edge-sensing applications where both timing margin and energy efficiency are non-negotiable.
Availability
APX803L40-18SA-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, and portable diagnostic instruments requiring stable component supply across multi-year production cycles.
Supply support for APX803L40-18SA-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 power management, signal integrity, and connectivity applications.
The APX803L series targets ultra-low-power supervisory functions in space-constrained, battery-operated systems - emphasizing precision threshold accuracy, minimal current draw, and robust thermal performance across industrial temperature ranges.
FAQ
What is the exact reset timeout for APX803L40-18SA-7?
The APX803L40-18SA-7 provides a nominal reset active timeout of 450 ms, with min/max values of 292 ms and 608 ms respectively across temperature and process variation. This value is factory-set and does not require external timing components.
Can APX803L40-18SA-7 monitor supplies above 1.8 V?
No - the APX803L40-18SA-7 has a fixed internal 1.8 V detection threshold and cannot be adjusted. It is intended solely for monitoring 1.8 V rails; for higher voltages, Diodes offers variants like APX803L40-33SA-7 (3.3 V) or APX803L40-50SA-7 (5.0 V).
Is a pull-up resistor required on the RESET pin?
Yes - the RESET pin is open-drain and must be pulled up to the host system's logic supply (e.g., 1.8 V or 3.3 V) via an external resistor (typically 10–100 kΩ) to generate a valid high-level signal when inactive.
Does APX803L40-18SA-7 support automotive qualification?
No - APX803L40-18SA-7 is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive applications, Diodes recommends the APX803LQ series, which undergoes PPAP and is manufactured in IATF 16949-certified facilities.
APX803L40-18SA-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:
- 1.8V
- 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
APX803L40-18SA-7 FAQ
1.How can I place an order for APX803L40-18SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-18SA-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 APX803L40-18SA-7 reliable?
The price and inventory of APX803L40-18SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-18SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-18SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-18SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-18SA-7?
APX803L40-18SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-18SA-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 APX803L40-18SA-7?
For technical support, including APX803L40-18SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-18SA-7 requirements.
6.How does Aetrix verify that APX803L40-18SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-18SA-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 APX803L40-18SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-18SA-7?
All APX803L40-18SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-18SA-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 APX803L40-18SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-18SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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