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Diodes Incorporated APX803L20-35C3-7
- Part No.:
- APX803L20-35C3-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
APX803L20-35C3-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,835
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Product details
Overview
APX803L20-35C3-7 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, 220ms reset timeout, open-drain active-low RESET output, and 1µA typical supply current. It monitors VCC in battery-powered systems such as portable medical devices, IoT edge sensors, and low-power microcontroller-based instrumentation.
For engineers reviewing the APX803L20-35C3-7 datasheet, APX803L20-35C3-7 pinout, APX803L20-35C3-7 application, or APX803L20-35C3-7 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use scenarios, and validated alternative options for power-supply monitoring in space-constrained, energy-sensitive designs.
Technical Context
The APX803L20-35C3-7 implements a fixed-threshold voltage detection architecture with internal hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its reset assertion occurs within 20µs when VCC drops below 3.5V, and release requires VCC to exceed 3.5V + hysteresis before deassertion.
It operates across –40°C to +85°C ambient temperature, supports 0.9V–5.5V supply range, and maintains threshold stability with 50ppm/°C temperature coefficient. The device requires no external components and delivers robust ESD immunity (±4kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.5V ±1.5% - precisely triggers reset when main supply falls below nominal 3.5V rail |
| Reset Timeout | 220ms (typ.) - holds active-low RESET signal for system-safe boot initialization |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables multi-year operation on coin-cell batteries |
| Response Time | 20µs - ensures rapid fault detection before microprocessor corruption |
| Output Type | Open-drain, active-low - allows wired-OR configuration and flexible pull-up voltage selection |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Hysteresis | 0.01×VTH (35mV) - prevents chatter near threshold during noisy or slow-ramping supplies |
Pinout & Package
SOT323 (SC-70) 3-pin surface-mount package with 1.3mm × 2.1mm footprint and 0.65mm lead pitch; optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and reset logic; must be low-impedance connection |
| 2 | RESET | Open-drain active-low output; sinks up to 20mA; requires external pull-up for logic-level compatibility |
| 3 | VCC | Power supply input; monitors itself for undervoltage condition; valid from 0.9V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Reduces BOM count and layout area; eliminates calibration resistors or timing capacitors |
| Fixed 3.5V detection threshold | Eliminates design uncertainty vs. adjustable detectors; ensures consistent reset behavior across production lots |
| 220ms factory-programmed delay | Guarantees sufficient hold time for full microcontroller power stabilization before release |
| 1µA typical supply current | Enables always-on supervision without measurable impact on battery runtime in sleep-mode-critical systems |
| ±1.5% threshold accuracy | Supports tight supply-margin designs where 3.5V rails tolerate <±50mV variation |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 battery with ultra-low quiescent current requirement. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until 3.5V rail stabilizes post-battery insertion or brownout recovery. Use Value: Prevents firmware execution at invalid supply levels, eliminating sensor data corruption and false alarms. | Use Scenario: DIN-rail mounted remote I/O node operating from 24VDC converted to 3.3V via LDO. IC Role / Device Role / Timing Role: Monitors 3.3V domain to ensure clean µC reset during field wiring transients or power cycling. Use Value: 220ms timeout matches typical LDO startup delay, avoiding premature release and boot failure. |
| Smart Home Edge Controllers | Asset Tracking Beacons |
Use Scenario: Battery-powered Zigbee coordinator with deep-sleep duty cycle and cold-start requirements. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply; asserts RESET during wake-from-sleep voltage sag caused by RF transmit burst. Use Value: 20µs response captures sub-millisecond dips, ensuring deterministic recovery without software watchdog intervention. | Use Scenario: GPS-enabled logistics tag using Li-SOCl₂ primary cell with 10-year shelf life target. IC Role / Device Role / Timing Role: Detects end-of-life voltage drop below 3.5V to trigger graceful shutdown and last-report transmission. Use Value: ±1.5% accuracy enables precise EOL prediction without over-engineering safety margin into battery size. |
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, 200ms timeout, 1.1µA supply current, SOT23-6 package | Requires external pull-up; lacks hysteresis specification in datasheet | Select if 3.3V threshold aligns with system rail and 6-pin layout is acceptable |
| MAX809SEUR+T | 3.08V threshold, 140ms timeout, 10µA supply current, SOT23-3 package | Higher quiescent current reduces battery life; tighter temp range (–40°C to +105°C) | Choose only when MAX809's automotive qualification (AEC-Q100) is mandatory |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L20-35C3-7 offers superior threshold accuracy (±1.5% vs. ±2.5%), lower supply current (1µA vs. ≥10µA), and guaranteed hysteresis-making it optimal for precision, long-life, and space-constrained 3.5V supervision.
Availability
APX803L20-35C3-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home edge controllers, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for APX803L20-35C3-7 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 belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power-rail monitoring in battery-operated and energy-harvesting systems.
FAQ
What is the exact reset threshold voltage of APX803L20-35C3-7?
The APX803L20-35C3-7 has a factory-trimmed reset threshold of 3.5V with ±1.5% accuracy over temperature (–40°C to +85°C), confirmed in Electrical Characteristics Table of DS38171 Rev. 3–2. This value is fixed internally and not adjustable via external components.
Does APX803L20-35C3-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor (typically 10kΩ to VCC or host logic rail) is mandatory to establish a defined high state when the output is not asserted. No internal pull-up is integrated.
Can APX803L20-35C3-7 operate from a 1.8V supply?
No - the minimum recommended VCC is 0.9V, but the 3.5V threshold requires the monitored supply to reach at least 3.5V for proper release. It cannot supervise 1.8V rails; for such voltages, Diodes offers APX803L18 variants with 1.8V thresholds.
Is APX803L20-35C3-7 RoHS-compliant and halogen-free?
Yes - APX803L20-35C3-7 is fully RoHS 3 compliant (2015/863/EU), lead-free, and halogen- and antimony-free ("Green" per Diodes' definition: Br+Cl <1500ppm, Br <900ppm, Cl <900ppm, Sb <1000ppm), as stated in Notes 1–3 of DS38171.
APX803L20-35C3-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 143ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
APX803L20-35C3-7 FAQ
1.How can I place an order for APX803L20-35C3-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-35C3-7 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 APX803L20-35C3-7 reliable?
The price and inventory of APX803L20-35C3-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-35C3-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-35C3-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-35C3-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-35C3-7?
APX803L20-35C3-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-35C3-7 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 APX803L20-35C3-7?
For technical support, including APX803L20-35C3-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-35C3-7 requirements.
6.How does Aetrix verify that APX803L20-35C3-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-35C3-7 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 APX803L20-35C3-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-35C3-7?
All APX803L20-35C3-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-35C3-7, 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 APX803L20-35C3-7 part is unused and in its original packaging.
Return procedure for APX803L20-35C3-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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