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Diodes Incorporated APX803L40-32SA-7
- Part No.:
- APX803L40-32SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-32SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,835
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Product details
Overview
APX803L40-32SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.0V threshold detection with ±1.5% accuracy, 450ms reset timeout, and 1µA typical supply current in SOT23-3 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.
For engineers reviewing the APX803L40-32SA-7 datasheet, APX803L40-32SA-7 pinout, APX803L40-32SA-7 application, or APX803L40-32SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, low-quiescent-current operation, and compatibility with 1.8–5.5V supply rails in space-constrained embedded systems.
Technical Context
The APX803L40-32SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.0V detection threshold, with hysteresis of 0.01×VTH to prevent chatter during brownout recovery. Its internal timing circuit generates a guaranteed 450ms (min) reset pulse after VCC drops below threshold.
Operating from 0.9V to 5.5V supply, it features an open-drain RESET output capable of sinking 3.5mA at 0.4V max VOL, enabling direct interface with µP reset inputs without external pull-up resistors. The device achieves 20µs response time from VCC drop to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 4.0V ±1.5% - ensures reliable reset activation at nominal 4.0V supply rail with minimal false triggering |
| Reset Timeout | 450ms (typ.) - guarantees sustained reset signal long enough for full µP initialization sequence |
| Supply Current | 1.0µA (typ.), 2.5µA (max) - enables multi-year battery life in coin-cell-powered wearables |
| Response Time | 20µs - provides rapid fault detection critical for real-time safety-critical subsystems |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architectures and flexible voltage-level translation |
| Operating Temp | -40°C to +85°C - validated for industrial-grade ambient operation without derating |
| Hysteresis | 0.01×VTH (40mV) - prevents oscillation during slow VCC recovery near threshold |
Pinout & Package
SOT23-3 package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, lead-free, halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and bandgap circuitry |
| 2 | RESET | Open-drain output; pulled low when VCC < 4.0V, high-impedance otherwise |
| 3 | VCC | Power input pin; supplies internal circuitry and senses monitored supply rail |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.0V threshold | Eliminates external resistor divider, reducing BOM count and layout area by 2 components |
| 450ms factory-set delay | Matches typical µP boot time requirements without requiring external RC timing network |
| ±1.5% threshold accuracy | Reduces need for margining in system-level power sequencing design |
| 1µA typical ICC | Enables use in always-on wake-on-event circuits without compromising battery longevity |
| No external components | Supports single-component reset solution for cost-sensitive consumer electronics |
Applications
| Smart Wearable Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Coin-cell-powered temperature/humidity sensor transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset if main 3.3V LDO output dips below 4.0V due to battery sag or load transient. Use Value: Prevents firmware corruption during brownout by holding µP in reset until stable 3.3V is restored for ≥450ms. |
Use Scenario: DIN-rail mounted analog input module operating in factory automation environment with 24VDC field power. IC Role / Device Role / Timing Role: Monitors local 5V logic rail derived from isolated DC/DC converter; triggers system-wide fault latch on undervoltage. Use Value: Ensures deterministic startup and avoids metastability in ADC sampling clocks during unstable power conditions. |
| Portable Medical Pulse Oximeter | Home Energy Monitor Hub |
Use Scenario: Battery-backed handheld oximeter with OLED display and optical sensing ASIC. IC Role / Device Role / Timing Role: Supervises 3.3V supply feeding MCU and analog front-end; asserts reset on battery voltage decay below 4.0V. Use Value: Guarantees clean shutdown before memory write errors occur, preserving calibration data integrity. |
Use Scenario: Wi-Fi-connected electricity meter gateway powered from USB-C PD adapter. IC Role / Device Role / Timing Role: Detects 5V rail collapse during AC mains interruption; initiates graceful firmware save before backup capacitor depletes. Use Value: Enables non-volatile storage of last valid energy reading within 450ms window before power loss. |
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 fixed threshold, 200ms default delay, 1.1µA ICC | Requires redesign of reset timing and may not meet 4.0V detection requirement | Select only if system uses 3.3V rail and shorter reset hold time is acceptable |
| MAX809SEUR+T | 3.08V threshold, 140ms min delay, 10µA ICC | Higher quiescent current reduces battery life; lower threshold risks premature reset on 4.0V rail | Not recommended for 4.0V monitoring; suitable only where 3.08V threshold aligns with system spec |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L40-32SA-7 uniquely satisfies 4.0V detection with sub-µA current and factory-trimmed 450ms delay-enabling direct replacement in designs where those exact parameters are required without circuit modification.
Availability
APX803L40-32SA-7 is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, smart home hubs, and battery-powered instrumentation requiring stable component supply across multi-year production cycles.
Supply support for APX803L40-32SA-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 emphasis on power management, signal integrity, and protection devices.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy voltage monitoring in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for APX803L40-32SA-7?
The APX803L40-32SA-7 has a factory-trimmed detection threshold of 4.0V with ±1.5% accuracy over temperature (−40°C to +85°C). This value is fixed internally and cannot be adjusted externally, ensuring consistent behavior across production lots without calibration.
Does APX803L40-32SA-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain and requires an external pull-up resistor to the host system's logic rail (e.g., 3.3V or 5V). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements; no internal pull-up is present.
Can APX803L40-32SA-7 operate from a 1.8V supply?
No - the minimum operating supply voltage is 0.9V, but the 4.0V detection threshold requires VCC ≥ 4.0V to function as intended. At 1.8V, the internal comparator cannot assert reset; the device remains inactive and draws ~1µA without generating valid supervision.
Is APX803L40-32SA-7 qualified for automotive applications?
No - APX803L40-32SA-7 is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803Lxx-xxQ) with PPAP support and IATF 16949 manufacturing, but this specific part number is for commercial/industrial use only.
APX803L40-32SA-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:
- 3.2V
- 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
APX803L40-32SA-7 FAQ
1.How can I place an order for APX803L40-32SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-32SA-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 APX803L40-32SA-7 reliable?
The price and inventory of APX803L40-32SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-32SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-32SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-32SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-32SA-7?
APX803L40-32SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-32SA-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 APX803L40-32SA-7?
For technical support, including APX803L40-32SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-32SA-7 requirements.
6.How does Aetrix verify that APX803L40-32SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-32SA-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 APX803L40-32SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-32SA-7?
All APX803L40-32SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-32SA-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 APX803L40-32SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-32SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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