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Diodes Incorporated APX803L-33SA-7
- Part No.:
- APX803L-33SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-33SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,410
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Product details
Overview
APX803L-33SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.3V 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 instrumentation and portable embedded systems.
For engineers reviewing the APX803L-33SA-7 datasheet, APX803L-33SA-7 pinout, APX803L-33SA-7 application, or APX803L-33SA-7 equivalent, key selection criteria include fixed 3.3V detection level, SOT23-3 package compatibility, 220ms recovery delay, and low-quiescent-current supervision for power-sensitive µP reset management.
Technical Context
The APX803L-33SA-7 implements a precision bandgap-based voltage reference with built-in hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its internal comparator continuously monitors VCC against the factory-trimmed 3.3V threshold and asserts RESET when VCC drops below 3.3V.
Reset assertion is latched until VCC rises above the release threshold (3.3V + hysteresis), and the device integrates a programmable 220ms timeout via on-chip RC timing-no external capacitor required. The open-drain output supports wired-OR configuration with pull-up to any logic rail up to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.3V ±1.5% - factory-trimmed fixed voltage for reliable µP VCC monitoring at standard I/O rail |
| Supply Current | 1.0µA typical - enables multi-year operation in coin-cell–powered devices without measurable battery drain |
| Reset Timeout | 220ms - ensures sufficient hold time for full µP initialization after power stabilization |
| Output Type | Open-drain, active-low - allows flexible interface with 1.8V–5.5V logic families and system-level reset bus sharing |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable consumer environments without derating |
| Response Time | 20µs - fast detection of brown-out events to prevent µP corruption during transient dips |
| Hysteresis | 0.01×VTH (≈33mV) - prevents chatter during slow VCC recovery near threshold |
Pinout & Package
SOT23-3 package (3-pin, 1.3mm × 2.9mm, 0.95mm height), RoHS-compliant, lead-free, halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and RESET output sink path |
| 2 | RESET | Open-drain active-low output; sinks up to 20mA; requires external pull-up |
| 3 | VCC | Power input (0.9–5.5V); supplies internal reference, comparator, and timing circuit |
Key Features
| Feature | Design Value |
|---|---|
| No external components | Self-contained supervision: no capacitor, resistor, or trim needed for 3.3V/220ms operation |
| High accuracy threshold | ±1.5% over temperature eliminates need for system-level calibration or margining |
| Ultra-low ICC | 1.0µA typ. enables use in always-on wake-up supervisors without compromising battery life |
| Fast response | 20µs detection-to-assertion latency ensures µP reset occurs before instruction corruption |
| Robust ESD rating | ±4000V HBM protects against handling damage in automated assembly and field service |
Applications
| Smartphone Power Sequencing | Industrial PLC Controller Reset |
|---|---|
|
Use Scenario: Monitors main 3.3V LDO output during cold start and brown-out conditions in smartphone application processors. IC Role / Device Role / Timing Role: Voltage detector providing clean, debounced reset signal to SoC's nRESET pin with 220ms hold time. Use Value: Prevents boot failure by ensuring stable 3.3V rail before releasing processor from reset, eliminating firmware lockups. |
Use Scenario: Supervises 3.3V I/O power rail in modular PLC backplane where multiple modules share common reset signaling. IC Role / Device Role / Timing Role: Open-drain RESET output enables wired-OR connection across 12+ modules on shared reset bus. Use Value: Guarantees synchronized restart of all I/O modules after power interruption, avoiding partial initialization states. |
| Portable Medical Sensor Node | Automotive Body Control Module |
|
Use Scenario: Powers ultra-low-power ECG sensor node powered by CR2032 coin cell; detects VCC sag during RF transmission bursts. IC Role / Device Role / Timing Role: Micro-power supervisor asserting reset only during sustained <3.3V condition (>220ms), ignoring brief transients. Use Value: Extends battery life by avoiding unnecessary resets during normal RF switching noise, while catching true undervoltage faults. |
Use Scenario: Monitors 3.3V domain powering CAN transceiver and microcontroller in non-safety-critical body control unit. IC Role / Device Role / Timing Role: Provides deterministic reset timing aligned with automotive cold-cranking voltage profiles. Use Value: Ensures CAN controller reinitializes cleanly after engine start voltage dip, preventing bus arbitration errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Higher ICC (8µA typ.), same 3.3V threshold and 200ms delay; requires external pull-up resistor | Designed for TI ecosystem integration; supports enable pin for manual reset override | Choose if system requires configurable enable input or tighter temp drift (±0.5% vs ±1.5%) despite higher quiescent current |
| MAX809SEUR+T | Fixed 3.08V threshold (not 3.3V), 140ms delay, 1.2µA ICC; SOT23-3 compatible | Lacks 3.3V option; hysteresis not specified; limited temp range (–40°C to +85°C same) | Select only if 3.08V threshold aligns with system VCC tolerance and 140ms delay meets timing budget |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L-33SA-7 delivers the exact 3.3V threshold with lowest ICC (1µA) and guaranteed 220ms timeout-critical for long-life battery systems where precision and power efficiency are jointly constrained.
Availability
APX803L-33SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC controllers, automotive body electronics, and smartphone power sequencing requiring stable component supply and long-term production continuity.
Supply support for APX803L-33SA-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 design centers across Asia, Europe, and the US.
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 APX803L-33SA-7?
The APX803L-33SA-7 has a factory-trimmed detection threshold of 3.3V with ±1.5% accuracy over –40°C to +85°C. This value is fixed internally and cannot be adjusted; it corresponds to the "33" in the part number and is verified per DS38171 Rev. 3–2 Section 4 Electrical Characteristics.
Does APX803L-33SA-7 require an external capacitor for timing?
No. The 220ms reset timeout is generated by an internal RC network; no external capacitor or resistor is needed. This is confirmed in the "Built-in Recovery Delay Time Options" feature list and the Typical Applications Circuit diagram, which shows zero external timing components.
Can APX803L-33SA-7 drive a 5V logic-level reset input directly?
Yes-the open-drain RESET output supports up to 5.5V on the pull-up side. When used with a 5V pull-up resistor, it delivers a valid active-low 5V-compatible reset signal, as specified in Absolute Maximum Ratings (VRESET = –0.3V to 6.0V) and Electrical Characteristics (VOL ≤ 0.4V @ 3.5mA sink).
Is APX803L-33SA-7 qualified for automotive applications?
No-APX803L-33SA-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade variants require separate part numbers with PPAP capability and IATF 16949 manufacturing; this part is rated for industrial temperature range only (–40°C to +85°C) and carries no automotive qualification markings.
APX803L-33SA-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:
- 3.3V
- 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-33SA-7 FAQ
1.How can I place an order for APX803L-33SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-33SA-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-33SA-7 reliable?
The price and inventory of APX803L-33SA-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-33SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-33SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-33SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-33SA-7?
APX803L-33SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-33SA-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-33SA-7?
For technical support, including APX803L-33SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-33SA-7 requirements.
6.How does Aetrix verify that APX803L-33SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-33SA-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-33SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-33SA-7?
All APX803L-33SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-33SA-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-33SA-7 part is unused and in its original packaging.
Return procedure for APX803L-33SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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