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Diodes Incorporated APX809S-40SA-7
- Part No.:
- APX809S-40SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-40SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:795
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Product details
Overview
APX809S-40SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +5V, +3.3V, +3.0V, or +2.5V rails. It asserts an active-low reset signal when VCC drops below 4.00 V (typ.), holds reset for ≥240 ms after VCC recovers, and operates down to VCC = 1.0 V with 7 µA supply current. Used in portable equipment and critical µP power monitoring.
For engineers reviewing the APX809S-40SA-7 datasheet, APX809S-40SA-7 pinout, APX809S-40SA-7 application, or APX809S-40SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.06 V), guaranteed reset validity at 1 V VCC, push-pull output drive capability, temperature-stable 30 ppm/°C threshold drift, and SOT23-3 package compatibility with space-constrained embedded designs.
Technical Context
The APX809S-40SA-7 integrates a precision bandgap reference, comparator, and push-pull output stage in a single die. Its reset assertion logic is triggered solely by VCC crossing the 4.00 V threshold, with built-in hysteresis and transient immunity to suppress false resets from supply noise.
It requires no external components for basic operation and delivers deterministic timing: minimum 140 ms reset timeout, typical 240 ms, and maximum 280 ms across -40°C to +125°C ambient, ensuring reliable power-on sequencing in industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V (typ.), ±0.06 V tolerance - ensures accurate detection of +5V rail brownout before µP instability occurs |
| Supply Current | 7 µA (typ.) - enables multi-year battery life in always-on portable devices |
| Reset Timeout | 240 ms (typ.) - meets JEDEC JESD85 requirement for minimum reset pulse width during power-up |
| Operating VCC Range | 1.0 V to 5.5 V - guarantees valid reset state even during deep brownout or partial power loss |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and supports direct connection to µP RESET pin |
| Temp Coefficient | 30 ppm/°C - maintains threshold stability over full industrial temperature range (-40°C to +125°C) |
| Reset Response Delay | 20 µs (max) - detects rapid VCC dips without missing critical undervoltage events |
Pinout & Package
SOT23-3 (SA) package: ultra-compact 2.9 mm × 1.3 mm × 1.0 mm surface-mount outline with gull-wing leads, RoHS-compliant and halogen-free molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 (RESET) | Active-Low Push-Pull Output | Drives low (≤0.3 V @ 1.2 mA) during reset; high-impedance off-state not applicable - true push-pull eliminates external pull-up |
| 3 (VCC) | Supply Input | Monitored power rail input; internally decoupled - no external capacitor required for basic operation |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00 V threshold | Guaranteed 3.94–4.05 V range at +25°C ensures compatibility with standard +5V supply tolerances (±5%) |
| No external components needed | Reduces BOM count and PCB area vs. discrete reset circuits; eliminates calibration and drift concerns |
| Valid reset down to 1.0 V VCC | Prevents spurious release during slow power-down or battery sag - critical for graceful µP shutdown |
| 232 °C/W θJA thermal resistance | Enables operation in sealed enclosures up to +125°C ambient without derating |
| 6 kV HBM ESD rating | Withstands handling and board-level transients without protection diodes or layout constraints |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC CPU Module |
|---|---|
Use Scenario: A wireless sensor node powered by two AA alkaline cells (1.8–3.2 V) monitors temperature and transmits data intermittently. IC Role / Device Role / Timing Role: Voltage detector supervises the 3.3 V LDO output feeding the MCU and radio; asserts reset if battery voltage sags below safe operating level. Use Value: Prevents corrupted firmware execution or radio transmission errors during brownout, extending field deployment life by avoiding uncontrolled reboots. | Use Scenario: A programmable logic controller uses a 5 V backplane supply to power its ARM-based CPU module and I/O interface ASICs. IC Role / Device Role / Timing Role: Monitors the 5 V rail and holds CPU in reset until stable post-power-up, synchronizing with FPGA configuration and peripheral initialization. Use Value: Ensures deterministic boot sequence across temperature and voltage variations, eliminating startup race conditions that cause field failures. |
| Medical Handheld Diagnostic Device | Automotive Infotainment Head Unit |
Use Scenario: A portable ultrasound probe with rechargeable Li-ion battery powers a low-power SoC and analog front-end. IC Role / Device Role / Timing Role: Detects 3.3 V supply collapse during battery swap or deep discharge, forcing controlled shutdown before memory corruption. Use Value: Meets IEC 62304 Class B software safety requirements by guaranteeing fail-safe state transitions under undervoltage. | Use Scenario: An infotainment head unit draws from vehicle battery (9–16 V) via multiple DC/DC converters, including a dedicated 5 V rail for MCU and display controller. IC Role / Device Role / Timing Role: Supervises the 5 V rail to detect alternator dropout or cold-crank voltage dip, initiating graceful UI freeze and data save before reset. Use Value: Avoids display artifacts or filesystem corruption during engine start, improving perceived reliability and reducing warranty claims. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.00 V threshold, 140 ms min reset timeout, open-drain output requiring external pull-up | Lacks push-pull drive; adds component count and leakage path in low-power sleep modes | Select if legacy design already uses pull-up resistor and requires Maxim footprint compatibility |
| TPS3808G33DBVR | 3.3 V threshold (not 4.0 V), adjustable timeout via capacitor, higher 12 µA quiescent current | Incorrect threshold for +5 V rail supervision; requires external timing capacitor and additional layout area | Select only if redesigning for 3.3 V core supply or needing programmable timeout |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX809S-40SA-7 offers superior integration (no pull-up needed), lower power (7 µA vs. 12–20 µA), and exact 4.00 V threshold alignment for +5 V systems - making it optimal for cost-sensitive, space-constrained, and battery-operated designs requiring drop-in reliability.
Availability
APX809S-40SA-7 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, industrial PLC CPU modules, medical handheld diagnostics, and automotive infotainment head units requiring stable component supply and long-term manufacturability.
Supply support for APX809S-40SA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The APX809S/810S series belongs to Diodes' precision voltage supervisor product line, engineered specifically for low-power, high-reliability µP reset applications in portable, industrial, and automotive electronics where minimal BOM, guaranteed timing, and wide temperature operation are essential.
FAQ
What is the minimum VCC voltage at which APX809S-40SA-7 guarantees correct RESET logic state?
The device guarantees valid reset assertion and de-assertion down to VCC = 1.0 V, as confirmed in the Recommended Operating Conditions table. At this voltage, the internal comparator remains functional and the push-pull output maintains specified VOL ≤ 0.3 V (sink) and VOH ≥ 0.8×VCC (source), enabling reliable µP hold during deep brownout.
Does APX809S-40SA-7 require an external capacitor on the RESET pin?
No. The APX809S-40SA-7 features a push-pull output architecture and does not require an external pull-up capacitor or resistor. Its output drives actively high or low without external components, unlike open-drain supervisors that mandate pull-up networks for proper logic levels.
How does the 240 ms typical reset timeout behave across temperature?
The reset timeout varies from 140 ms (min) to 280 ms (max) across -40°C to +125°C, with typical 240 ms at +25°C. This monotonic variation is characterized in the datasheet's "RESET Active Timeout Period vs. Temperature" plot and ensures compliance with JEDEC timing requirements under all operating conditions.
Can APX809S-40SA-7 be used to monitor a 3.3 V supply?
No - the APX809S-40SA-7 is factory-trimmed to a 4.00 V threshold (3.94–4.05 V range) and is intended for +5 V rail supervision. For 3.3 V systems, Diodes offers the APX809S-31SA-7 (3.08 V threshold) or APX809S-33SA-7 (3.30 V threshold), both in identical SOT23-3 packaging and electrical interface.
APX809S-40SA-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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX809S-40SA-7 FAQ
1.How can I place an order for APX809S-40SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-40SA-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 APX809S-40SA-7 reliable?
The price and inventory of APX809S-40SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S-40SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S-40SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-40SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-40SA-7?
APX809S-40SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-40SA-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 APX809S-40SA-7?
For technical support, including APX809S-40SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-40SA-7 requirements.
6.How does Aetrix verify that APX809S-40SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-40SA-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 APX809S-40SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S-40SA-7?
All APX809S-40SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-40SA-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 APX809S-40SA-7 part is unused and in its original packaging.
Return procedure for APX809S-40SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX809S-40SA-7 Tags
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