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Diodes Incorporated APX809-40SAG-7
- Part No.:
- APX809-40SAG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809-40SAG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
APX809-40SAG-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with active-low push-pull RESET output, precision 4.00 V ±0.07 V reset threshold (–40°C to +85°C), guaranteed reset assertion down to VCC = 1 V, and 200 ms typical reset timeout period. It monitors 5 V supply rails in embedded controllers and portable systems requiring reliable power-on/brownout reset signaling.
For engineers reviewing the APX809-40SAG-7 datasheet, APX809-40SAG-7 pinout, APX809-40SAG-7 application, or APX809-40SAG-7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), low 30 µA typical supply current, SOT23-3 package compatibility, and guaranteed logic-state validity at VCC ≥ 1 V.
Technical Context
The APX809-40SAG-7 integrates a precision voltage comparator with internal reference and a fixed 200 ms reset timeout timer. Its reset comparator rejects fast VCC transients and maintains valid output state across –40°C to +85°C ambient range.
It operates from 1.1 V to 5.5 V supply, asserts RESET low when VCC falls below 4.00 V (min 3.92 V, max 4.08 V), and holds RESET low for ≥140 ms after VCC rises above threshold - ensuring robust initialization of microcontrollers during power ramp-up or brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V ±0.07 V (3.92–4.08 V) at –40°C to +85°C - ensures reliable detection of 5 V supply droop before microcontroller malfunction. |
| Reset Timeout | 200 ms typical (140–280 ms min–max) - guarantees sufficient hold time for full µP initialization after power stabilization. |
| Supply Current | 30 µA typical at +25°C - enables use in battery-powered equipment without significant standby drain. |
| VCC Validity Range | RESET guaranteed valid down to VCC = 1 V - supports reset assertion integrity during deep undervoltage conditions. |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor and drives CMOS/TTL inputs directly. |
| ESD Protection | 5 kV HBM - provides robust handling margin during board assembly and field operation. |
Pinout & Package
APX809-40SAG-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 | Connects to monitored 5 V rail; device operates from 1.1 V to 5.5 V with full functionality down to 1 V. |
| 2 (GND) | Ground Reference | System ground return path; must be low-impedance to ensure accurate threshold sensing and noise immunity. |
| 3 (RESET) | Active-Low Reset Output | Push-pull output asserted low during reset; sinks up to 3.2 mA at 0.4 V - directly interfaces µP /RESET pins without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00 V threshold | ±2.5% tolerance over full temperature range ensures deterministic reset timing across industrial environments. |
| No external components required | Integrated reference, comparator, and timer eliminate discrete resistors/capacitors - reduces BOM count and layout area. |
| Valid reset output at VCC ≥ 1 V | Enables fail-safe reset assertion even during severe brownout, preventing undefined µP execution states. |
| Low 30 µA supply current | Extends battery life in portable instrumentation and remote sensors without compromising supervision reliability. |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power sequencing and brownout recovery in DIN-rail mounted programmable logic controllers operating in factory environments with fluctuating 24 VDC-derived 5 V supplies. IC Role / Device Role / Timing Role: Supervises 5 V logic rail and asserts active-low /RESET to ARM Cortex-M7 microcontroller until stable power is confirmed. Use Value: Prevents firmware corruption during line sags by guaranteeing ≥140 ms reset pulse after VCC recovers above 3.92 V. |
Use Scenario: Battery-backed vital sign monitors requiring continuous operation during AC/DC adapter transitions or low-battery discharge phases. IC Role / Device Role / Timing Role: Monitors regulated 5 V supply derived from Li-ion battery and triggers system reset if voltage drops below 4.00 V. Use Value: Ensures clinical data integrity by asserting reset before ADC reference or communication peripherals become unstable. |
| Embedded Network Gateways | Automotive Body Control Modules |
|
Use Scenario: Ethernet-to-CAN gateways deployed in commercial building automation systems with shared 5 V power domains. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for dual-core RISC-V SoC managing protocol translation and secure boot. Use Value: Eliminates need for RC-based reset circuits - improves timing repeatability and reduces calibration overhead. |
Use Scenario: Non-safety-critical body control units (e.g., power window modules) powered from vehicle 12 V battery via linear regulator. IC Role / Device Role / Timing Role: Supervises 5 V MCU supply during cold-crank (battery dip to 6 V) and hot-soak (ambient up to 85°C) conditions. Use Value: Maintains reset assertion validity down to VCC = 1 V - critical for detecting deep undervoltage events before regulator dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T1G | 4.00 V threshold, but 140 ms min reset timeout (vs. 140–280 ms for APX809); higher 50 µA supply current. | Less margin for slow-ramping µPs; not suitable where >200 ms hold time is required per design spec. | Select only if legacy MAXIM footprint reuse is mandatory and timeout margin is verified in target system. |
| TPS3808G33DBVR | 3.3 V fixed threshold (not 4.0 V); adjustable timeout via external capacitor; 1.1 µA quiescent current. | Requires redesign of threshold network and timing circuit; unsuitable for direct 5 V rail monitoring without external divider. | Prefer only when ultra-low power (<2 µA) dominates over simplicity and fixed 4.0 V accuracy. |
Compared with MAX809TRD2T1G and TPS3808G33DBVR, the APX809-40SAG-7 delivers tighter threshold accuracy (±1.75%), lower supply current than MAX809, and plug-and-play 4.0 V supervision without external components - making it optimal for cost-sensitive, space-constrained 5 V embedded systems.
Availability
APX809-40SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and embedded network gateways requiring stable component supply with guaranteed long-term availability and traceable green sourcing.
Supply support for APX809-40SAG-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, single-function power-supply supervision in resource-constrained embedded systems - emphasizing precision threshold stability, minimal external components, and SOT23-3 footprint efficiency.
FAQ
What is the minimum VCC required for APX809-40SAG-7 to assert a valid RESET signal?
The APX809-40SAG-7 guarantees correct RESET logic state (low during reset, high otherwise) for VCC ≥ 1 V. Below 1 V, the output becomes high-impedance; for zero-volt validity, a 100 kΩ pull-down resistor on RESET is recommended per datasheet Figure 1.
Does APX809-40SAG-7 require an external capacitor for reset timing?
No. The 200 ms typical reset timeout is generated by an internal timer - no external capacitor or resistor is needed. This eliminates timing drift due to component tolerance and temperature variation, simplifying layout and improving reliability.
Can APX809-40SAG-7 monitor a 3.3 V supply?
No. The "40" suffix denotes a 4.00 V reset threshold optimized for 5 V systems. For 3.3 V monitoring, Diodes offers APX809-31SAG-7 (3.08 V threshold) or APX809-29SAG-7 (2.93 V threshold), both in identical SOT23-3 packaging.
Is APX809-40SAG-7 pin-compatible with other APX809 variants?
Yes. All APX809-xSAG-7 variants share identical SOT23-3 (SA) pinout: Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET. Only the reset threshold voltage differs between part numbers - enabling drop-in replacement within same voltage-monitoring requirements.
APX809-40SAG-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:
- 4V
- 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
APX809-40SAG-7 FAQ
1.How can I place an order for APX809-40SAG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809-40SAG-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 APX809-40SAG-7 reliable?
The price and inventory of APX809-40SAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809-40SAG-7 is usually 5 days.
3.What payment methods are accepted for APX809-40SAG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809-40SAG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809-40SAG-7?
APX809-40SAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809-40SAG-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 APX809-40SAG-7?
For technical support, including APX809-40SAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809-40SAG-7 requirements.
6.How does Aetrix verify that APX809-40SAG-7 is sourced from the original manufacturer or authorized distributors?
All APX809-40SAG-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 APX809-40SAG-7 meets industry standards.
7.What is the process for return or replacement of APX809-40SAG-7?
All APX809-40SAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809-40SAG-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 APX809-40SAG-7 part is unused and in its original packaging.
Return procedure for APX809-40SAG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX809-40SAG-7 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
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APX803L20-29SA-7
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