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Diodes Incorporated APX809-23SAG-7
- Part No.:
- APX809-23SAG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809-23SAG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,779
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Product details
Overview
APX809-23SAG-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor reset supervisor IC with active-low push-pull RESET output, precision 2.25 V reset threshold (±0.05 V over −40°C to +85°C), 200 ms typical reset timeout, 30 µA supply current, and guaranteed reset validity down to VCC = 1 V. It monitors 2.5 V/3.0 V/3.3 V systems in embedded controllers and portable battery-powered equipment.
For engineers reviewing the APX809-23SAG-7 datasheet, APX809-23SAG-7 pinout, APX809-23SAG-7 application, or APX809-23SAG-7 equivalent, key selection criteria include reset threshold accuracy (2.25 V ±0.05 V), push-pull active-low output drive capability, 240 ms minimum reset assertion time after power-up, operation down to 1 V supply, and SOT23 footprint compatibility for space-constrained designs.
Technical Context
The APX809-23SAG-7 implements a precision voltage comparator with internal reference and fixed-delay timer to generate a clean, glitch-immune reset signal. Its reset threshold is trimmed to 2.25 V at 25°C with ±30 ppm/°C tempco and ±0.05 V total variation across −40°C to +85°C.
The push-pull output drives RESET low during undervoltage conditions and holds it low for ≥240 ms after VCC rises above threshold; it guarantees correct logic state for VCC ≥1 V and ignores fast transients on VCC via internal filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25 V ±0.05 V (−40°C to +85°C); ensures reliable reset assertion before 2.5 V system brownout |
| Reset Timeout | 200 ms typ., ≥240 ms min.; provides sufficient hold time for microprocessor initialization |
| Supply Current | 30 µA typ. at 25°C; enables ultra-low-power operation in battery-backed systems |
| Valid Reset Down To | VCC = 1 V; guarantees defined logic state during deep brownout recovery |
| Output Type | Push-pull active-low; eliminates need for external pull-up resistor and supports direct µP reset input |
| ESD Protection | 5 kV HBM; enhances robustness in handling and board assembly environments |
Pinout & Package
APX809-23SAG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 2.4 mm × 1.3 mm footprint and 0.95 mm height. Thermal resistance is θJA = 201°C/W on standard FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Supply Input | Accepts 1.1–5.5 V operating voltage; powers internal comparator and timer |
| 2 (GND) | Ground Reference | Return path for supply and output; must be low-impedance connection to system ground plane |
| 3 (RESET) | Active-Low Reset Output | Push-pull driver asserts logic low during undervoltage; sinks ≥1.2 mA at 0.3 V max |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.25 V threshold | ±0.05 V tolerance over full temperature range enables deterministic reset timing in 2.5 V systems |
| 240 ms minimum reset pulse | Guarantees µP reset hold time exceeds boot ROM access and PLL lock requirements |
| 30 µA supply current | Reduces quiescent power draw in always-on monitoring circuits and extends battery life |
| Push-pull active-low output | Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs. open-drain |
| Valid reset down to VCC = 1 V | Ensures controlled shutdown sequence even during severe brownout or backup battery discharge |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power sequencing and brownout protection in DIN-rail mounted programmable logic controllers with dual 24 V/5 V rails. IC Role / Device Role / Timing Role: Supervises 3.3 V logic rail and asserts active-low RESET to ARM Cortex-M7 MCU during undervoltage events. Use Value: Prevents firmware corruption by ensuring MCU remains held in reset until 3.3 V stabilizes ≥240 ms post-recovery. |
Use Scenario: Battery-backed vital signs monitor requiring fail-safe startup and low-power sleep mode recovery. IC Role / Device Role / Timing Role: Monitors 2.5 V analog front-end supply and triggers reset when Li-ion drops below 3.2 V pack voltage. Use Value: 30 µA quiescent current minimizes standby drain; 2.25 V threshold aligns with LDO dropout margin for clean wake-up. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: Tamper-resistant electricity meter with isolated RS-485 interface and secure bootloader. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for 3.0 V microcontroller and crypto accelerator ASIC. Use Value: ±0.05 V threshold accuracy prevents spurious resets during line transients; push-pull output drives reset net without external components. |
Use Scenario: 12 V automotive subsystem (e.g., door module) with local 5 V/3.3 V regulation and CAN transceiver. IC Role / Device Role / Timing Role: Supervises 3.3 V domain powering CAN controller and watchdog timer during cold-crank (4.5 V battery). Use Value: Guaranteed reset validity down to VCC = 1 V ensures safe state retention during cranking dips; 5 kV HBM withstands ESD in vehicle assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 2.93 V reset threshold, 140–320 ms timeout, 1.6 µA max ICC, SOT23-3 | Higher threshold targets 3.3 V systems; lower supply current suits ultra-low-power IoT nodes | Select when supervising 3.3 V rails where tighter 2.93 V trip point avoids nuisance resets near nominal |
| TPS3808G125DBVR | 1.25 V threshold, adjustable delay (0–10 s), 1.1 µA ICC, SOT23-6 | Requires external capacitor for timing; supports custom reset durations beyond fixed 200 ms | Choose when system requires programmable reset duration or sub-2 V supply monitoring not supported by APX809 |
Compared with MAX809TRD2T and TPS3808G125DBVR, APX809-23SAG-7 offers optimal balance of 2.25 V threshold accuracy, fixed 240 ms minimum reset hold, and zero-external-component simplicity for cost-sensitive 2.5 V embedded control applications.
Availability
APX809-23SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for APX809-23SAG-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 devices, with design centers in Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.
The APX809/810 series was developed as a cost-optimized, high-accuracy reset supervisor family targeting space-constrained embedded systems requiring guaranteed reset behavior across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage and its tolerance for APX809-23SAG-7?
The APX809-23SAG-7 has a nominal reset threshold of 2.25 V, with a guaranteed range of 2.20 V to 2.30 V across −40°C to +85°C ambient temperature. This ±0.05 V tolerance ensures consistent brownout detection in 2.5 V systems without requiring calibration or external trimming components.
Does APX809-23SAG-7 require an external pull-up resistor on the RESET pin?
No. The APX809-23SAG-7 features a push-pull output stage that actively drives RESET low during undervoltage and high after timeout - no external pull-up resistor is needed. This simplifies layout, reduces BOM count, and improves noise immunity compared to open-drain alternatives.
Can APX809-23SAG-7 operate reliably during cold-crank automotive battery conditions?
Yes. The device guarantees valid reset output down to VCC = 1 V and tolerates supply voltages as low as 1.1 V, making it suitable for monitoring regulated 3.3 V domains during automotive cold-crank events where battery voltage may dip to 4.5 V and downstream regulators sag transiently.
Is APX809-23SAG-7 pin-compatible with other members of the APX809/810 family?
Yes - all APX809/810 variants share identical SOT23-3 (SA/SR) pinout: Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET. Only the reset threshold (e.g., -23, -26, -29) and output polarity (09 = active-low, 10 = active-high) differ; no PCB redesign is required when substituting within the same package code.
APX809-23SAG-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:
- 2.25V
- 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:
- SOT-23-3
APX809-23SAG-7 FAQ
1.How can I place an order for APX809-23SAG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809-23SAG-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 APX809-23SAG-7 reliable?
The price and inventory of APX809-23SAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809-23SAG-7 is usually 5 days.
3.What payment methods are accepted for APX809-23SAG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809-23SAG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809-23SAG-7?
APX809-23SAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809-23SAG-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 APX809-23SAG-7?
For technical support, including APX809-23SAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809-23SAG-7 requirements.
6.How does Aetrix verify that APX809-23SAG-7 is sourced from the original manufacturer or authorized distributors?
All APX809-23SAG-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 APX809-23SAG-7 meets industry standards.
7.What is the process for return or replacement of APX809-23SAG-7?
All APX809-23SAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809-23SAG-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 APX809-23SAG-7 part is unused and in its original packaging.
Return procedure for APX809-23SAG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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