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Diodes Incorporated APX809-31SRG-7
- Part No.:
- APX809-31SRG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809-31SRG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23R
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
APX809-31SRG-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor reset supervisor IC with active-low push-pull RESET output, 3.08 V reset threshold (±0.07 V), 200 ms typical reset timeout, and guaranteed operation down to VCC = 1 V. It monitors 3.3 V supply rails in embedded controllers and portable systems to prevent erroneous code execution during power-up, brownout, or shutdown.
For engineers reviewing the APX809-31SRG-7 datasheet, APX809-31SRG-7 pinout, APX809-31SRG-7 application, or APX809-31SRG-7 equivalent, key selection criteria include reset threshold accuracy (±2.3% at 3.08 V), low 30 µA supply current, push-pull drive capability (1.2 mA sink), and SOT23 footprint compatibility for space-constrained designs.
Technical Context
The APX809-31SRG-7 integrates a precision voltage comparator with internal reference and a monostable delay circuit to generate a clean, glitch-immune reset pulse. Its reset assertion is triggered when VCC falls below 3.08 V and held active for ≥240 ms after VCC rises above threshold.
Designed for robustness in noisy environments, it ignores fast transients on VCC and guarantees valid logic states across -40°C to +85°C ambient, with reset threshold tempco ≤30 ppm/°C and supply current stable from 1.1 V to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V (min 3.02 V, max 3.15 V) - ensures reliable reset assertion before 3.3 V rail drops below system operational margin |
| Reset Timeout | 200 ms typical (140–280 ms range) - provides sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 30 µA typical - enables multi-year battery life in portable equipment without compromising reset reliability |
| VCC Operating Range | 1.1 V to 5.5 V - supports operation during deep brownout and compatibility with 1.8 V–5 V logic families |
| Output Type | Push-pull active-low - eliminates need for external pull-up resistor and delivers 1.2 mA sink drive directly to µP reset input |
| Reset Validity | Guaranteed to VCC = 1 V - maintains defined logic state through most of power collapse, preventing metastability |
Pinout & Package
SOT23-3 (SR package) - compact 2.9 mm × 1.3 mm surface-mount footprint with 0.95 mm pitch, RoHS-compliant "Green" molding compound, and thermal resistance θJA = 201 °C/W on standard FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Supply Input | Power rail connection; internally powers comparator, reference, and driver; must be decoupled locally |
| 2 (GND) | Ground Reference | Analog and digital ground return; shared reference for threshold detection and output logic level |
| 3 (RESET) | Active-Low Reset Output | Push-pull output asserted low during reset; drives µP /RESET pin directly without external components |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | ±2.3% tolerance over full temperature range ensures deterministic reset timing without design margin uncertainty |
| 200 ms reset timeout | Monostable delay calibrated to exceed µP power-on stabilization requirements per JEDEC JESD8-12 |
| 30 µA supply current | Enables use in always-on battery-backed monitoring circuits with negligible impact on standby lifetime |
| Push-pull active-low output | Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
| Valid reset down to VCC = 1 V | Prevents floating reset state during deep undervoltage, avoiding undefined µP behavior prior to complete power loss |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Power sequencing in DIN-rail mounted programmable logic controllers subject to 24 V DC bus fluctuations and EMI. IC Role / Device Role / Timing Role: Supervisory reset generator asserting /RESET until 3.3 V I/O and core rails stabilize post-power-up or brownout recovery. Use Value: Prevents firmware lockup or spurious I/O writes by guaranteeing ≥240 ms reset hold time even during 100 µs VCC transients. | Use Scenario: Battery-powered vital signs monitor requiring multi-year shelf life and reliable wake-from-sleep initialization. IC Role / Device Role / Timing Role: Low-current reset supervisor enabling safe boot after Li-ion cell voltage sag during cold start. Use Value: 30 µA quiescent current extends battery service life; 3.08 V threshold aligns precisely with 3.3 V LDO dropout margin. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: 12 V automotive subsystem powered via 3.3 V buck converter exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Brownout detector triggering controlled µC reset when 3.3 V rail dips below 3.08 V during transient events. Use Value: Push-pull output drives reset net without external components, reducing PCB area and failure points in harsh environments. | Use Scenario: Revenue-grade electricity meter operating continuously on AC-derived 3.3 V supply with backup supercapacitor. IC Role / Device Role / Timing Role: Power-fail supervisor holding µC in reset during AC outage until supercapacitor sustains regulated 3.3 V for secure data save. Use Value: Guaranteed reset validity to VCC = 1 V ensures deterministic state retention during final capacitor discharge phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 3.08 V threshold, 240 ms min timeout, open-drain output requiring external pull-up | Lacks integrated pull-up; adds component count and reduces noise immunity in high-EMI environments | Select when legacy board reuse requires identical timing but open-drain interface is acceptable |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 200 ms fixed timeout, push-pull output, 1.6 µA IQ | Lower threshold and ultra-low current suit ultra-low-power applications but require tighter supply tolerance alignment | Select for battery-operated IoT nodes where sub-µA quiescent current outweighs 0.08 V threshold offset |
Compared with MAX809TRD3T and TPS3808G30DBVR, the APX809-31SRG-7 offers optimal balance of precision threshold (3.08 V), push-pull simplicity, and industrial temperature support - making it ideal for cost-sensitive, space-constrained 3.3 V systems needing no external components.
Availability
APX809-31SRG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for APX809-31SRG-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 APX809/810 series was designed specifically for cost-effective, component-minimized microprocessor reset supervision in space-constrained embedded systems operating across extended industrial temperatures.
FAQ
What is the exact reset threshold voltage for APX809-31SRG-7, and how does it vary with temperature?
The APX809-31SRG-7 has a nominal reset threshold of 3.08 V, with min/max values of 3.02 V and 3.15 V over -40°C to +85°C. Its temperature coefficient is ≤30 ppm/°C, resulting in ≤±10 mV drift across the full operating range - verified per DS31322 Rev. 5 electrical characteristics table.
Does APX809-31SRG-7 require an external pull-up resistor on the RESET pin?
No. The APX809-31SRG-7 features a push-pull output stage capable of sinking 1.2 mA, eliminating the need for an external pull-up resistor. This reduces BOM count, PCB area, and susceptibility to noise-induced glitches compared to open-drain reset supervisors.
Can APX809-31SRG-7 operate reliably during rapid VCC transients, such as those caused by switching regulators?
Yes. The internal reset comparator is explicitly designed to ignore fast transients on VCC, as confirmed in the Functional Description section of DS31322. It asserts reset only when VCC remains below 3.08 V for longer than the comparator's response time (tS = 20 µs), preventing false triggers.
Is APX809-31SRG-7 suitable for new designs, or is it marked as "Not Recommended for New Design"?
The APX809-31SRG-7 itself is not marked "Not Recommended for New Design." That note applies exclusively to the obsolete APX809S/810S variants. APX809-31SRG-7 remains an active, supported part per Diodes Incorporated's current product status and ordering information tables.
APX809-31SRG-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:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT23R
APX809-31SRG-7 FAQ
1.How can I place an order for APX809-31SRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809-31SRG-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 APX809-31SRG-7 reliable?
The price and inventory of APX809-31SRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809-31SRG-7 is usually 5 days.
3.What payment methods are accepted for APX809-31SRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809-31SRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809-31SRG-7?
APX809-31SRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809-31SRG-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 APX809-31SRG-7?
For technical support, including APX809-31SRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809-31SRG-7 requirements.
6.How does Aetrix verify that APX809-31SRG-7 is sourced from the original manufacturer or authorized distributors?
All APX809-31SRG-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 APX809-31SRG-7 meets industry standards.
7.What is the process for return or replacement of APX809-31SRG-7?
All APX809-31SRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809-31SRG-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 APX809-31SRG-7 part is unused and in its original packaging.
Return procedure for APX809-31SRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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