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Diodes Incorporated APX803S05-29SA-7
- Part No.:
- APX803S05-29SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803S05-29SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,932
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Product details
Overview
APX803S05-29SA-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 2.93V supply monitoring in embedded systems. It asserts an active-low RESET signal during power-up, brownout, or VCC drop below threshold, with a typical timeout of 50ms and guaranteed operation down to VCC = 1V. Its 10µA typical supply current and precision ±0.04V threshold tolerance make it suitable for battery-powered controllers and portable instrumentation.
For engineers reviewing the APX803S05-29SA-7 datasheet, APX803S05-29SA-7 pinout, APX803S05-29SA-7 application, or APX803S05-29SA-7 equivalent, key selection factors include reset threshold accuracy (2.89–2.97V), open-drain output compatibility with bidirectional µP reset pins, temperature-stable 30ppm/°C tempco, and fixed 50ms timeout timing under -40°C to +85°C operating range.
Technical Context
The APX803S05-29SA-7 integrates a precision voltage comparator with hysteresis and a monostable timer to generate a deterministic reset pulse. Its internal reference is trimmed to deliver 2.93V nominal threshold with ±40mV max deviation over temperature and supply.
It features an open-drain RESET output capable of sinking ≥1.2mA at 0.3V low-level voltage while operating from 1.0V to 5.5V VCC. The device ignores fast transients on VCC via built-in noise immunity and guarantees valid logic state down to VCC = 1V before entering high-impedance mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.89V (min) to 2.97V (max) at +25°C - ensures reliable detection of 2.93V supply brownout without false triggering |
| Reset Timeout | 20ms (min) to 70ms (max) - provides sufficient hold time for µP initialization after VCC recovery |
| Supply Current | 10µA (typ), 15µA (max) - enables multi-year battery life in portable equipment |
| VCC Operating Range | 1.0V to 5.5V - supports reset assertion even during deep brownout or ultra-low-power wake-up sequences |
| Output Type | Open-drain active-low - allows wired-OR configuration, level shifting, and direct interface with bidirectional µP reset pins |
| Tempco | 30ppm/°C - maintains threshold stability across industrial temperature range (-40°C to +85°C) |
| ESD Protection | 3kV HBM - enhances robustness in handling and board assembly environments |
Pinout & Package
SOT23-3 (SA package) surface-mount package with 2.4mm × 1.3mm footprint, 0.915mm height, and gull-wing leads. RoHS-compliant, halogen-free, and lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and timer circuitry |
| 2 | VCC | Power supply input; powers internal circuitry and defines monitored rail |
| 3 | RESET | Open-drain active-low output; requires external pull-up to define logic-high level and sink capability |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±40mV tolerance over full temperature range ensures accurate 3.0V system supervision without calibration |
| 50ms typical reset timeout | Guaranteed minimum 20ms hold time prevents premature µP release during marginal VCC recovery |
| 10µA supply current | Enables integration into always-on subsystems without compromising battery runtime |
| Valid reset down to VCC = 1V | Ensures deterministic reset behavior through deep undervoltage conditions before system collapse |
| Open-drain output stage | Supports flexible reset bus architecture, multi-source reset arbitration, and voltage-level translation |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controllers operating from 3.0V rails in factory automation cabinets with variable ambient temperature and EMI exposure. IC Role / Device Role / Timing Role: Supervises main 3.0V supply and asserts reset during line sags or hot-swap events to prevent firmware corruption. Use Value: 30ppm/°C tempco and 20ms min timeout ensure consistent reset timing across -40°C to +85°C, eliminating field failures due to marginal brownout recovery. |
Use Scenario: Battery-powered vital signs monitors requiring long shelf life and reliable boot-up after storage or low-battery wake-up. IC Role / Device Role / Timing Role: Monitors 2.93V LDO output powering ARM Cortex-M0+ MCU; holds reset until stable VCC and internal oscillator settle. Use Value: 10µA typical ICC extends 10-year shelf-life requirements; open-drain output interfaces directly with µP's bidirectional reset pin using single 10kΩ pull-up. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: Revenue-grade electricity meters with dual-supply architecture (3.3V MCU + 2.93V RTC/sensor rail) deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Resets metering SoC when 2.93V sensor rail dips below threshold during transient load switching or capacitor aging. Use Value: Independent 2.93V monitoring avoids false resets caused by 3.3V rail noise; 3kV HBM ESD rating withstands utility-grade surge environments. |
Use Scenario: Low-voltage body control units powered from 12V automotive battery via 2.93V LDO, subject to cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Provides fail-safe reset during cold-crank brownout where VCC drops to ~5.5V then recovers; ignores fast spikes via comparator hysteresis. Use Value: Guaranteed reset validity down to VCC = 1V ensures reset assertion even during worst-case cranking; 5.5V absolute max VCC rating accommodates LDO overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 3.08V reset threshold (±2%), 140ms timeout, push-pull output | Requires no external pull-up; incompatible with bidirectional reset buses | Select when system uses dedicated reset line and prioritizes simplicity over bus sharing |
| TPS3808G33DBVR | 3.3V threshold, adjustable timeout (1ms–10s), enable input, 1.5µA quiescent current | Higher complexity and cost; suited for designs requiring programmable delay or sequenced power-up | Select when timeout flexibility or ultra-low ICC (<2µA) outweighs fixed-timing simplicity |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX803S05-29SA-7 offers optimal balance of precision 2.93V threshold, 50ms deterministic timing, open-drain flexibility, and sub-15µA ICC - making it ideal for cost-sensitive, space-constrained 3.0V embedded systems needing robust brownout response without design overhead.
Availability
APX803S05-29SA-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APX803S05-29SA-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 APX803S series belongs to Diodes' supervisory IC product line, engineered specifically for deterministic power-on reset and brownout protection in resource-constrained embedded systems with strict cost, size, and power budgets.
FAQ
What is the exact reset threshold voltage for APX803S05-29SA-7?
The APX803S05-29SA-7 has a guaranteed reset threshold range of 2.89V (minimum) to 2.97V (maximum) at +25°C, with nominal value 2.93V. This is confirmed in the Electrical Characteristics table of DS39161 Rev. 2–2, and the tempco is specified at 30ppm/°C over –40°C to +85°C.
Does APX803S05-29SA-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain active-low and must be pulled up externally. Typical values range from 4.7kΩ to 10kΩ to the monitored supply or another logic-compatible rail. The datasheet confirms this in the Functional Description section and shows a 10kΩ pull-up in the Typical Applications Circuit.
Can APX803S05-29SA-7 operate reliably below 1.0V VCC?
No - the device guarantees correct RESET logic state only down to VCC = 1.0V. Below that, the output enters high-impedance mode and ceases to sink current. This is explicitly stated in the datasheet's Functional Description and Absolute Maximum Ratings sections.
How does the 50ms timeout differ from the standard APX803S-29 variant?
The APX803S05-29SA-7 provides a typical timeout of 50ms (20–70ms range), whereas the base APX803S-29 variant offers 240ms (140–280ms). This shorter timeout is optimized for faster-booting µPs and reduces unnecessary system hold time during rapid power recovery events.
APX803S05-29SA-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:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803S05-29SA-7 FAQ
1.How can I place an order for APX803S05-29SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803S05-29SA-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 APX803S05-29SA-7 reliable?
The price and inventory of APX803S05-29SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803S05-29SA-7 is usually 5 days.
3.What payment methods are accepted for APX803S05-29SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803S05-29SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803S05-29SA-7?
APX803S05-29SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803S05-29SA-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 APX803S05-29SA-7?
For technical support, including APX803S05-29SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803S05-29SA-7 requirements.
6.How does Aetrix verify that APX803S05-29SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803S05-29SA-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 APX803S05-29SA-7 meets industry standards.
7.What is the process for return or replacement of APX803S05-29SA-7?
All APX803S05-29SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803S05-29SA-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 APX803S05-29SA-7 part is unused and in its original packaging.
Return procedure for APX803S05-29SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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