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Diodes Incorporated APX803L40-34SA-7
- Part No.:
- APX803L40-34SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-34SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,092
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Product details
Overview
APX803L40-34SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply rails in battery-powered and embedded digital systems. It features a fixed 3.4V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, open-drain active-low RESET output, and operates from 0.9V to 5.5V supply. It is used in portable equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the APX803L40-34SA-7 datasheet, APX803L40-34SA-7 pinout, APX803L40-34SA-7 application, or APX803L40-34SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay timing stability over temperature, low quiescent current impact on battery life, and compatibility with 3-pin SOT23 footprint layouts in space-constrained designs.
Technical Context
The APX803L40-34SA-7 implements a precision bandgap-based voltage reference comparator with built-in hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal fixed 3.4V threshold is laser-trimmed during production, eliminating external resistor networks.
Reset assertion occurs within 20µs when VCC drops below 3.4V, and release requires VCC to exceed 3.4V + hysteresis before RESET deasserts; the 450ms timeout ensures sufficient system stabilization after power recovery in microcontroller boot sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.4V ±1.5% - precise detection level for 3.3V rail supervision with guaranteed margin against false resets |
| Supply Current | 1.0µA typical - enables multi-year operation in coin-cell–powered IoT sensors without measurable battery drain |
| Reset Timeout | 450ms (typ.) - provides adequate hold time for full microcontroller initialization and peripheral configuration |
| Output Type | Open-drain, active-low - supports wired-OR reset bus architectures and flexible pull-up voltage selection (up to 5.5V) |
| Operating Voltage | 0.9V to 5.5V - allows direct connection to VCC of 1.8V, 3.3V, or 5V logic domains without level-shifting |
| Response Time | 20µs max - ensures rapid fault detection before processor state corruption occurs during undervoltage events |
| Temperature Range | -40°C to +85°C - qualified for industrial and consumer ambient environments without derating |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm × 1.0mm body, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Low-impedance return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 (RESET) | Open-Drain Reset Output | Active-low signal asserted when VCC < 3.4V; requires external pull-up (typically 10kΩ to VCC or higher voltage rail) |
| 3 (VCC) | Supply Input | Power source for internal circuitry; also the monitored rail-no separate sense input required |
Key Features
| Feature | Design Value |
|---|---|
| No external components | Eliminates BOM cost and PCB area for resistive divider, capacitor timing network, or pull-up resistor (except system-level pull-up) |
| Fixed threshold trim | Laser-trimmed 3.4V reference ensures consistent performance across lots without calibration or trimming steps in production |
| 450ms delay option | Longest available timeout in APX803L series-suited for complex boot sequences requiring extended reset hold in ARM Cortex-M or RISC-V SoCs |
| 1µA supply current | Enables integration into always-on subsystems (e.g., RTC backup domain) without compromising energy budget |
| ±1.5% threshold accuracy | Reduces design margin requirements versus looser-tolerance supervisors, allowing tighter VCC regulation specs |
Applications
| Smart Wearable Power Management | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervising 3.3V supply to BLE SoC and sensor hub in fitness tracker with CR2032 battery. IC Role / Device Role / Timing Role: Voltage detector providing power-on reset and brownout protection; asserts RESET until VCC stabilizes above 3.4V + hysteresis and holds for 450ms. Use Value: Prevents firmware crash during battery insertion or cold-start by guaranteeing full SoC initialization before code execution begins. | Use Scenario: Monitoring 3.3V auxiliary rail powering FPGA configuration memory and communication interface in modular PLC base unit. IC Role / Device Role / Timing Role: Supervisory IC generating system-wide reset pulse upon undervoltage, synchronized to FPGA startup timing requirements. Use Value: Ensures deterministic FPGA configuration load and UART/RS-485 transceiver enable sequence, avoiding bus contention or metastability. |
| Medical Infusion Pump Controller | Automotive Body Control Module (BCM) Subsystem |
Use Scenario: Validating 3.3V MCU supply in battery-backed infusion pump controller operating under variable load and temperature conditions. IC Role / Device Role / Timing Role: Critical safety monitor asserting hardware reset if VCC dips below 3.4V during motor actuation transients. Use Value: Meets IEC 62304 Class C software safety requirements by enabling fail-safe shutdown before dose delivery errors occur. | Use Scenario: Supervising 3.3V domain powering CAN transceiver and LIN interface in non-safety-critical BCM subassembly. IC Role / Device Role / Timing Role: Power supervisor ensuring clean reset assertion during vehicle ignition cycle and battery voltage sag (<10V). Use Value: Eliminates CAN bus arbitration errors and LIN node synchronization faults caused by marginal supply during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L40-29SA-7 | Same 3.4V threshold and SOT23 package, but 220ms reset timeout (vs. 450ms) | Suitable for simpler MCUs with faster boot times; insufficient hold time for multi-stage FPGA configuration | Select when shorter reset duration reduces system startup latency without compromising reliability |
| TLV803EA34DBZR | 3.4V threshold, 200ms timeout, 0.6µA supply current, same SOT23-3 package | Lower ICC benefits ultra-low-power designs; reduced timeout limits use in complex boot flows | Prefer for energy-harvesting or sub-µA standby applications where 200ms reset hold is sufficient |
Compared with APX803L40-29SA-7 and TLV803EA34DBZR, the APX803L40-34SA-7 delivers the longest reset hold time in its family-critical for robust initialization of modern SoCs-while maintaining identical accuracy and package compatibility, making it optimal for systems demanding extended reset assertion without increasing board area or component count.
Availability
APX803L40-34SA-7 is available at Aetrix Electronics and suitable for smart wearable power management, industrial PLC I/O modules, medical infusion pump controllers, and automotive BCM subsystems requiring stable component supply across long production lifecycles.
Supply support for APX803L40-34SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The APX803L series targets ultra-low-power supervisory functions in battery-operated and energy-sensitive embedded systems, emphasizing minimal ICC, precision threshold accuracy, and drop-in replaceability across multiple delay options and packages.
FAQ
What is the exact reset threshold voltage and tolerance for APX803L40-34SA-7?
The APX803L40-34SA-7 has a factory-trimmed detection threshold of 3.4V with a guaranteed accuracy of ±1.5% over -40°C to +85°C ambient temperature. This corresponds to a min/max range of 3.349V to 3.451V at +25°C, and includes hysteresis of 0.01×VTH (≈34mV) to prevent chatter near the trip point.
Can APX803L40-34SA-7 monitor a 5V supply rail?
Yes-the device operates with VCC from 0.9V to 5.5V and monitors that same rail. When used on a 5V system, it asserts RESET if VCC falls below 3.4V. The open-drain output supports pull-up to 5.5V, enabling direct interface with 5V logic without level shifters.
Is a pull-up resistor required on the RESET pin?
Yes-an external pull-up resistor (typically 4.7kΩ to 10kΩ) is mandatory on the open-drain RESET pin to define the inactive (high) state voltage level. The value must balance rise time (lower resistance = faster edge) against current draw during RESET assertion (higher resistance = lower sink current).
Does APX803L40-34SA-7 support operation below 1.0V?
No-the minimum recommended operating voltage is 0.9V per datasheet specifications, but functional reset detection is only guaranteed above 1.02×VTH (≥3.468V). Below ~2.5V, internal biasing may become unstable; the device is not characterized or specified for sub-2V operation.
APX803L40-34SA-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:
- 3.4V
- 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
APX803L40-34SA-7 FAQ
1.How can I place an order for APX803L40-34SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-34SA-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 APX803L40-34SA-7 reliable?
The price and inventory of APX803L40-34SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-34SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-34SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-34SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-34SA-7?
APX803L40-34SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-34SA-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 APX803L40-34SA-7?
For technical support, including APX803L40-34SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-34SA-7 requirements.
6.How does Aetrix verify that APX803L40-34SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-34SA-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 APX803L40-34SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-34SA-7?
All APX803L40-34SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-34SA-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 APX803L40-34SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-34SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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