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Diodes Incorporated APX803L-28SA-7
- Part No.:
- APX803L-28SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-28SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
APX803L-28SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.8V 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 in battery-powered IoT sensors and portable medical monitors.
For engineers reviewing the APX803L-28SA-7 datasheet, APX803L-28SA-7 pinout, APX803L-28SA-7 application, or APX803L-28SA-7 equivalent, key selection criteria include fixed 2.8V detection level, SOT23-3 package compatibility, 220ms recovery delay, and ultra-low quiescent current for energy-constrained systems.
Technical Context
The APX803L-28SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during power-up/down transitions. Its comparator continuously monitors VCC against the factory-trimmed 2.8V threshold and asserts RESET when VCC drops below VTH–100mV.
Reset assertion occurs within 20µs of threshold breach, and the device holds RESET low until VCC exceeds VTH + hysteresis (≈2.828V), after which the 220ms timeout period begins before release-ensuring stable microprocessor initialization in embedded controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 2.8V ±1.5% - Factory-trimmed threshold ensures reliable µP reset at nominal 2.8V rail without external calibration. |
| Supply Current | 1.0µA (typ.) - Enables multi-year operation on coin-cell batteries in always-on monitoring applications. |
| Reset Timeout | 220ms - Matches typical microcontroller boot stabilization time; prevents premature firmware execution. |
| Output Type | Open-drain, active-low - Allows wired-OR configuration with other reset sources and flexible pull-up voltage selection. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded systems including smart meters and edge gateways. |
| Threshold Hysteresis | 0.01×VTH (28mV) - Eliminates noise-induced false resets during brown-out conditions near threshold. |
| Response Time | 20µs - Guarantees sub-microsecond detection latency critical for real-time fault response in safety-critical subsystems. |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal bias circuitry; must be connected directly to system ground plane for noise immunity. |
| 2 (RESET) | Open-Drain Output | Active-low reset signal; requires external pull-up resistor (typically 10kΩ to VCC or higher rail) for proper logic level translation. |
| 3 (VCC) | Supply Input | Monitored power rail input; supports 0.9V to 5.5V operation, enabling use with 1.8V, 2.8V, 3.3V, and 5V systems. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 1.0µA typ. - Reduces standby power budget by >95% versus legacy reset ICs, extending battery life in wearables. |
| Fixed 2.8V threshold | ±1.5% accuracy over temperature - Eliminates need for external resistive divider, saving PCB area and BOM cost. |
| Programmable reset timeout | 220ms option - Matches boot timing requirements of ARM Cortex-M0+ and RISC-V microcontrollers. |
| No external components | Self-contained detection circuit - Requires only decoupling capacitor; simplifies layout and improves reliability. |
| Robust ESD protection | ±4000V HBM - Withstands handling and board assembly stress without latch-up or parameter shift. |
Applications
| Smart Wearables | Industrial Sensors |
|---|---|
Use Scenario: Continuous heart-rate monitoring in wrist-worn fitness trackers powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Voltage supervisor ensuring MCU reset during battery voltage sag below 2.8V during RF transmission bursts. Use Value: Prevents corrupted sensor data logging and firmware crashes by enforcing clean restart before VCC recovers. |
Use Scenario: Wireless vibration sensor node deployed in factory machinery with intermittent solar charging. IC Role / Device Role / Timing Role: Power-on reset generator that holds MCU in reset until 2.8V rail stabilizes post cold-start. Use Value: Guarantees deterministic boot sequence despite slow-rising supply from supercapacitor backup. |
| Medical Telemetry | Edge Gateway Controllers |
Use Scenario: Bluetooth-enabled glucose meter requiring FDA-compliant power integrity during measurement cycles. IC Role / Device Role / Timing Role: Fault-detection element asserting RESET within 20µs if 2.8V analog front-end supply dips below spec. Use Value: Meets IEC 62304 Class B software safety requirements by eliminating undetected brown-out operation. |
Use Scenario: Industrial Ethernet gateway managing Modbus RTU field devices with dual 3.3V/2.8V power domains. IC Role / Device Role / Timing Role: Independent 2.8V rail monitor coordinating synchronized reset of auxiliary communication ICs. Use Value: Avoids bus contention and register corruption during asymmetric power sequencing across voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G28DBVR | 2.8V threshold, 350ms default timeout, 1.1µA supply current, SOT23-6 package | Requires external capacitor for timeout adjustment; larger footprint limits space-constrained designs | Prefer when adjustable delay or higher ESD rating (±6kV) is required; not drop-in due to pin count and package mismatch |
| MAX809SEUR+T | 2.8V threshold, 240ms timeout, 10µA supply current, SOT23-3 package | 10× higher quiescent current reduces battery lifetime in multi-year deployments | Select only if legacy qualification (AEC-Q100 Grade 3) or long-term availability assurance is mandatory |
Compared with TPS3808G28DBVR and MAX809SEUR+T, the APX803L-28SA-7 delivers optimal trade-off of ultra-low power (1µA), exact SOT23-3 pin compatibility, and factory-set 220ms timing-enabling direct replacement in space- and energy-sensitive designs without layout or firmware changes.
Availability
APX803L-28SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial sensors, and medical telemetry requiring stable component supply with guaranteed long-term manufacturability.
Supply support for APX803L-28SA-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 reset generation in battery-operated and energy-harvesting systems.
FAQ
What is the exact detection threshold voltage for APX803L-28SA-7?
The APX803L-28SA-7 has a factory-trimmed detection threshold of 2.8V with ±1.5% accuracy over –40°C to +85°C ambient temperature. This value is fixed internally and does not require external components or calibration. The hysteresis is 0.01×VTH (28mV), ensuring stable release at ~2.828V.
Can APX803L-28SA-7 be used with a 1.8V supply rail?
No. While the APX803L-28SA-7 monitors a 2.8V threshold, its VCC pin requires a minimum operating voltage of 0.9V and maximum of 5.5V per datasheet specifications. It cannot supervise a 1.8V rail because the monitored voltage must reach at least 2.8V to avoid false triggering; use APX803L-18SA-7 instead for 1.8V supervision.
Does APX803L-28SA-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 4.7kΩ to 10kΩ) to the target logic rail (e.g., 3.3V or VCC) is mandatory for proper signal level translation and bus compatibility. No internal pull-up is integrated.
Is APX803L-28SA-7 qualified for automotive applications?
No. The APX803L-28SA-7 is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the APX803L-28SA-7Q variant (with Q suffix), which undergoes additional stress testing and is manufactured in IATF 16949-certified facilities.
APX803L-28SA-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:
- 2.8V
- 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-28SA-7 FAQ
1.How can I place an order for APX803L-28SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-28SA-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-28SA-7 reliable?
The price and inventory of APX803L-28SA-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-28SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-28SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-28SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-28SA-7?
APX803L-28SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-28SA-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-28SA-7?
For technical support, including APX803L-28SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-28SA-7 requirements.
6.How does Aetrix verify that APX803L-28SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-28SA-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-28SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-28SA-7?
All APX803L-28SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-28SA-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-28SA-7 part is unused and in its original packaging.
Return procedure for APX803L-28SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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