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Diodes Incorporated APX809-29SRG-7
- Part No.:
- APX809-29SRG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809-29SRG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23R
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
APX809-29SRG-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor supervisory IC with active-low push-pull RESET output, precision 2.93V reset threshold (±0.07V over −40°C to +85°C), 200ms typical reset timeout, 30µA supply current, and guaranteed reset validity down to VCC = 1V. It monitors 3.0V/3.3V digital power rails in embedded controllers and portable µP systems.
For engineers reviewing the APX809-29SRG-7 datasheet, APX809-29SRG-7 pinout, APX809-29SRG-7 application, or APX809-29SRG-7 equivalent, key selection criteria include reset threshold accuracy (2.93V ±0.07V), push-pull drive capability (1.2mA sink), temperature-stable timeout (140–280ms), low-quiescent current (30µA typ), and SOT23 footprint compatibility.
Technical Context
The APX809-29SRG-7 implements a precision bandgap-based voltage comparator with internal hysteresis and a monostable delay circuit. Its reset assertion logic is triggered when VCC falls below 2.93V and held active for ≥240ms after VCC rises above threshold.
It operates across −40°C to +85°C ambient, maintains valid logic states at VCC ≥1V, and rejects fast transients on VCC via built-in noise immunity. The push-pull output eliminates need for external pull-up resistors and supports direct interface to CMOS µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±0.07V (min/max over −40°C to +85°C); ensures reliable brownout detection for 3.0V/3.3V systems |
| Reset Timeout | 200ms typical (140–280ms range); guarantees sufficient processor initialization time after power recovery |
| Supply Current | 30µA typical at +25°C; enables battery-powered operation with minimal standby drain |
| Output Type | Push-pull active-low RESET; drives µP reset pin directly without external pull-up resistor |
| VCC Validity Range | Reset output guaranteed valid down to VCC = 1V; prevents undefined state during deep brownout |
| ESD Protection | 5kV HBM; provides robust handling in manufacturing and board assembly environments |
| Package | SOT23 (SR code); 3-pin surface-mount footprint compatible with high-density PCB layouts |
Pinout & Package
SOT23-3 (SR package) with 2.9mm × 1.3mm body, 0.95mm height, and standard lead pitch of 0.95mm. RoHS-compliant, halogen-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Supply Input | Accepts 1.1V–5.5V operating voltage; powers internal comparator and timer |
| 2 (GND) | Ground Reference | Return path for supply and output current; must be low-impedance connection to system ground plane |
| 3 (RESET) | Active-Low Reset Output | Push-pull driver asserts logic low during reset; sinks up to 1.2mA at VCC ≥2.93V −0.2V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±0.07V tolerance over full temperature range ensures deterministic reset timing in 3.0V/3.3V systems |
| 200ms reset timeout | Monostable delay guarantees µP reset hold time exceeds minimum boot requirement for ARM Cortex-M and PIC microcontrollers |
| 30µA supply current | Enables >10-year battery life in coin-cell–powered IoT sensors with periodic wake-up cycles |
| Push-pull active-low output | Eliminates external pull-up resistor, reducing BOM count and PCB area in space-constrained designs |
| VCC = 1V reset validity | Ensures defined logic state during deep undervoltage events where most µPs are nonfunctional but reset integrity remains critical |
Applications
| Industrial Controllers | Portable Medical Sensors |
|---|---|
|
Use Scenario: PLC I/O modules powered by 3.3V DC-DC converters subject to line transients and thermal cycling. IC Role / Device Role / Timing Role: Monitors 3.3V rail and asserts active-low RESET to ARM Cortex-M4 MCU during brownout, holding reset for ≥240ms post-recovery. Use Value: Prevents firmware corruption during factory floor voltage sags; eliminates need for external RC timing network. |
Use Scenario: Wearable ECG patch with CR2032 battery and ultra-low-power MSP430 microcontroller. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output and triggers reset when battery voltage drops below 2.93V during discharge. Use Value: Extends usable battery life by enabling precise low-voltage cutoff without sacrificing reset reliability. |
| Network Edge Routers | Automotive Body Control Modules |
|
Use Scenario: Fanless edge gateway with dual 3.3V/5V rails and Ethernet PHY requiring clean power-on sequencing. IC Role / Device Role / Timing Role: Provides independent 2.93V supervision for 3.3V domain; RESET signal synchronizes FPGA configuration and PHY initialization. Use Value: Ensures deterministic boot order across temperature extremes (−40°C to +85°C) without calibration. |
Use Scenario: Door module with LIN transceiver and 3.0V microcontroller powered from vehicle battery via buck regulator. IC Role / Device Role / Timing Role: Detects battery dips below 2.93V during cold-crank and holds µC in reset until stable 3.0V rail is restored. Use Value: Avoids spurious CAN/LIN communication errors during engine start transient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3T | 2.93V threshold, same SOT23-3, but 1.2µA max supply current vs. 40µA max for APX809-29SRG-7 | Limited to industrial temp (−40°C to +85°C) like APX809, but lacks guaranteed reset validity below 1.2V | Select for ultra-low-power battery applications where <2µA quiescent current is mandatory and VCC rarely drops below 1.2V |
| TPS3808G33DBVR | 3.3V threshold (not 2.93V), adjustable delay (0–10s), 1.8µA typical ICC, SOT23-6 package | Requires external capacitor for delay tuning; incompatible pinout and higher BOM cost due to 6-pin footprint | Choose only if system requires programmable reset timeout or tighter 3.3V nominal rail monitoring with margin |
Compared with MAX809TRD3T and TPS3808G33DBVR, the APX809-29SRG-7 delivers optimal balance of precision 2.93V threshold, SOT23-3 simplicity, and proven reset validity down to 1V-making it ideal for cost-sensitive, space-constrained 3.0V/3.3V µP systems where fixed 200ms timeout suffices.
Availability
APX809-29SRG-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical sensors, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for APX809-29SRG-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, space-efficient microprocessor supervision in 3.0V/3.3V/5V embedded systems-emphasizing precision threshold accuracy, low ICC, and SOT23 integration without external components.
FAQ
What is the exact reset threshold voltage for APX809-29SRG-7 and its temperature stability?
The APX809-29SRG-7 has a nominal reset threshold of 2.93V, with min/max values of 2.86V and 3.00V across −40°C to +85°C. Its temperature coefficient is ≤30 ppm/°C, ensuring drift of less than 10mV over the full operating range-critical for consistent brownout response in thermally varying environments.
Does APX809-29SRG-7 require an external pull-up resistor on the RESET pin?
No. The APX809-29SRG-7 features a push-pull output stage that actively drives RESET low during reset and high otherwise. This eliminates the need for an external pull-up resistor, reducing component count, PCB area, and potential noise coupling from resistor parasitics in high-density layouts.
Can APX809-29SRG-7 operate reliably below 1.1V VCC?
The device is specified for VCC ≥1.1V per recommended operating conditions, and its RESET output is guaranteed valid only down to VCC = 1V. Below 1V, the output becomes high-impedance and undefined; for sub-1V operation, a 100kΩ pull-down resistor is recommended to maintain logic-low state during deep undervoltage.
How does the reset timeout behave during repeated brownout events?
Each time VCC falls below the 2.93V threshold, the internal timer resets to zero and reasserts RESET low. The 200ms timeout begins only after VCC rises above threshold and remains there-ensuring continuous reset assertion during fluctuating supply conditions, such as those seen during automotive cold-cranking or unstable DC-DC startup.
APX809-29SRG-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:
- Not For New Designs
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
APX809-29SRG-7 FAQ
1.How can I place an order for APX809-29SRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809-29SRG-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 APX809-29SRG-7 reliable?
The price and inventory of APX809-29SRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809-29SRG-7 is usually 5 days.
3.What payment methods are accepted for APX809-29SRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809-29SRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809-29SRG-7?
APX809-29SRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809-29SRG-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 APX809-29SRG-7?
For technical support, including APX809-29SRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809-29SRG-7 requirements.
6.How does Aetrix verify that APX809-29SRG-7 is sourced from the original manufacturer or authorized distributors?
All APX809-29SRG-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 APX809-29SRG-7 meets industry standards.
7.What is the process for return or replacement of APX809-29SRG-7?
All APX809-29SRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809-29SRG-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 APX809-29SRG-7 part is unused and in its original packaging.
Return procedure for APX809-29SRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX809-29SRG-7 Tags
-
MIC826SYMT-TR
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