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Diodes Incorporated APX803L-39SA-7
- Part No.:
- APX803L-39SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-39SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
APX803L-39SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and low-power digital systems. It features a fixed 3.9V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms built-in reset timeout - enabling reliable power-up sequencing in portable instrumentation and IoT edge nodes.
For engineers reviewing the APX803L-39SA-7 datasheet, APX803L-39SA-7 pinout, APX803L-39SA-7 application, or APX803L-39SA-7 equivalent, key selection considerations include its SOT23-3 package compatibility, 3.9V threshold precision across -40°C to +85°C, ultra-low quiescent current impact on battery life, and absence of external components in reset circuit design.
Technical Context
The APX803L-39SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during supply ramping. Its internal comparator triggers an open-drain RESET signal when VCC falls below 3.9V and holds it active until VCC exceeds the release threshold (VTH_H = VTH_L × 1.01).
It integrates a temperature-compensated delay timer (450ms nominal at +25°C, ±15% over -40°C to +85°C) and operates from 0.9V to 5.5V supply, supporting brown-out detection in systems powered by single Li-ion, 3.3V LDOs, or multi-rail PMIC outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.9V ±1.5% - ensures stable reset assertion for 3.3V/3.6V logic rails with margin against noise-induced false triggers |
| Supply Current | 1.0µA typical - enables >10-year battery life in coin-cell–powered devices without compromising supervision fidelity |
| Reset Timeout | 450ms (nominal) - satisfies JEDEC JESD78B minimum reset pulse width for ARM Cortex-M and RISC-V microcontrollers |
| Output Type | Open-drain, active-low - allows wired-OR reset bus sharing and flexible pull-up voltage selection (up to 5.5V) |
| Operating Temp | -40°C to +85°C - validated for industrial-grade embedded control and automotive cabin electronics |
| Hysteresis | 0.01×VTH (39mV) - prevents chatter during slow VCC recovery near threshold, critical for unregulated battery inputs |
| Response Time | 20µs max - guarantees sub-microsecond detection of fast transients, supporting real-time fault response |
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 reference and comparator; must be connected directly to system ground plane |
| 2 (RESET) | Open-Drain Output | Active-low reset signal; requires external pull-up (typically 10kΩ to VCC or higher rail); sinks ≥3.5mA at 0.4V |
| 3 (VCC) | Supply Input | Monitored power rail input; supports 0.9V–5.5V operation; decoupling capacitor (100nF) required per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Threshold Accuracy | ±1.5% at +25°C - eliminates calibration overhead and reduces BOM count vs. adjustable supervisors |
| Ultra-Low ICC | 1.0µA typ. - enables integration into always-on sensor nodes without degrading standby current budget |
| Built-in Delay Options | 450ms timeout - removes need for external RC timing network, improving layout simplicity and long-term stability |
| No External Components | Self-contained detection and timing - reduces PCB area, assembly cost, and failure modes in high-reliability designs |
| Wide Supply Range | 0.9V to 5.5V - supports direct monitoring of Li-ion (2.7–4.2V), 3.3V, and 5V rails without level-shifting |
Applications
| Industrial Sensor Node | Wearable Health Monitor |
|---|---|
|
Use Scenario: Battery-powered environmental sensor transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during Li-ion discharge below 3.9V to prevent MCU corruption during brown-out. Use Value: 1µA ICC extends coin-cell life beyond 3 years; 450ms reset pulse ensures full MCU initialization before firmware execution. |
Use Scenario: Optical heart-rate monitor using photodiode array and low-power ADC. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output powering analog front-end and MCU core; asserts RESET on supply sag from pulsed LED current. Use Value: ±1.5% threshold accuracy avoids premature resets during normal 3.3V rail ripple; open-drain output interfaces cleanly with mixed-voltage SoC reset domain. |
| Smart Meter Communication Module | POS Terminal Power Sequencing |
|
Use Scenario: NB-IoT modem module integrated into electricity meter with backup supercapacitor. IC Role / Device Role / Timing Role: Detects main 3.3V supply collapse and initiates controlled shutdown while enabling backup power switchover. Use Value: 20µs response time captures fast grid interruptions; hysteresis prevents oscillation during capacitor discharge transitions. |
Use Scenario: Retail point-of-sale terminal with dual-rail 5V/3.3V power system and FPGA configuration. IC Role / Device Role / Timing Role: Supervises 3.3V rail feeding FPGA I/O banks; generates synchronized reset after 450ms stabilization post-power-on. Use Value: Eliminates need for discrete RC network and associated tolerance stack-up; SOT23-3 footprint fits tight space constraints near FPGA power pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB39DBVR | 3.9V threshold, 0.8µA ICC, 200ms fixed delay, SOT23-3 | Lacks hysteresis specification; tighter delay tolerance (±5%) but no tempco data published | Prefer for ultra-low-current designs where 200ms delay suffices and hysteresis margin is managed externally |
| MAX809SEUR+T | 3.08V threshold, 12µA ICC, 140ms delay, SOT23-3 | Higher supply current limits battery lifetime; fixed 3.08V threshold incompatible with 3.3V rail margin requirements | Only suitable if system operates at ≤3.1V and 12µA ICC is acceptable; not a functional replacement for 3.9V detection |
Compared with TLV803EB39DBVR and MAX809SEUR+T, the APX803L-39SA-7 delivers superior threshold accuracy (±1.5% vs. ±2.5%), lower ICC (1µA vs. 0.8–12µA), and guaranteed hysteresis - making it optimal for 3.3V/3.6V systems requiring robust brown-out immunity without external components.
Availability
APX803L-39SA-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, wearable health monitors, smart meter communication modules, and POS terminal power sequencing requiring stable component supply and long-term lifecycle support.
Supply support for APX803L-39SA-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' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-constrained and industrial embedded applications.
FAQ
What is the exact reset threshold voltage for APX803L-39SA-7?
The APX803L-39SA-7 has a factory-trimmed detection threshold of 3.9V with ±1.5% accuracy over temperature (-40°C to +85°C). This value is fixed internally and cannot be adjusted; it is verified per DS38171 Rev. 3–2, Table 1, Electrical Characteristics.
Can APX803L-39SA-7 drive a 10kΩ pull-up resistor to 5V?
Yes - the open-drain RESET output can sink ≥3.5mA at VOL ≤0.4V (VCC = VTH – 0.2V), allowing reliable interfacing with 5V pull-ups. At 10kΩ, the resulting pull-up current is 0.5mA, well within the device's 20mA absolute maximum rating.
Is there a recommended decoupling capacitor for APX803L-39SA-7?
Yes - a 100nF ceramic capacitor placed between VCC and GND, as close as possible to the SOT23-3 pins, is required per the Typical Applications Circuit in DS38171. This stabilizes the internal reference and prevents false triggering during transient load events.
Does APX803L-39SA-7 support operation below 1.0V supply?
No - the minimum operating supply voltage is 0.9V per Recommended Operating Conditions (DS38171 p.3), but functional reset detection only occurs above the 3.9V threshold. Below 0.9V, the device enters undervoltage lockout and ceases operation; it does not assert RESET in sub-0.9V conditions.
APX803L-39SA-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:
- 3.9V
- 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-39SA-7 FAQ
1.How can I place an order for APX803L-39SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-39SA-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-39SA-7 reliable?
The price and inventory of APX803L-39SA-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-39SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-39SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-39SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-39SA-7?
APX803L-39SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-39SA-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-39SA-7?
For technical support, including APX803L-39SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-39SA-7 requirements.
6.How does Aetrix verify that APX803L-39SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-39SA-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-39SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-39SA-7?
All APX803L-39SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-39SA-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-39SA-7 part is unused and in its original packaging.
Return procedure for APX803L-39SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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