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Diodes Incorporated APX809S-44SA-7
- Part No.:
- APX809S-44SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-44SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
APX809S-44SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 5V digital systems. It provides active-low push-pull reset assertion when VCC falls below 4.38 V (typ.), maintains reset for ≥240 ms after VCC recovery, and operates reliably down to VCC = 1.0 V - enabling robust power monitoring in battery-powered controllers and embedded instrumentation.
For engineers reviewing the APX809S-44SA-7 datasheet, APX809S-44SA-7 pinout, APX809S-44SA-7 application, or APX809S-44SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.06 V), ultra-low 7 µA supply current, guaranteed logic-state validity at 1 V VCC, and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S-44SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.38 V threshold (25°C), with ±30 ppm/°C temperature coefficient ensuring stability across –40°C to +125°C. Its internal timer guarantees minimum 240 ms reset pulse width after VCC exceeds threshold, eliminating need for external RC timing components.
It features a push-pull output stage capable of sinking 1.2 mA at VOL ≤ 0.3 V (VCC = VTH − 0.2 V), and remains fully functional with supply voltages as low as 1.0 V - critical for brown-out detection during battery discharge or cold-start conditions in portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V (typ.), ±0.06 V tolerance - ensures reliable 5V system reset without false triggering |
| Supply Current | 7 µA (typ.) - enables multi-year operation on coin-cell batteries in always-on monitoring |
| Reset Pulse Width | 240 ms (min.) - satisfies µP power-on reset timing requirements per Intel/ARM specifications |
| VCC Operating Range | 1.0 V to 5.5 V - supports valid reset assertion during deep brown-out and full rail operation |
| Output Type | Active-low push-pull - drives standard CMOS reset inputs directly, no pull-up resistor required |
| Temp Coefficient | 30 ppm/°C - limits threshold drift to <±15 mV over –40°C to +125°C ambient |
| ESD Rating | 6 kV HBM - withstands handling and board-level ESD events in industrial assembly |
Pinout & Package
APX809S-44SA-7 is housed in a RoHS-compliant, halogen-free SOT23-3 package (JEDEC TO-236AB), with 1.3 mm × 2.9 mm footprint and 1.1 mm height - optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal comparator and output stage; must be connected to system ground plane |
| 2 (RESET) | Active-Low Reset Output | Push-pull output asserted LOW during undervoltage; sinks up to 1.2 mA at ≤0.3 V |
| 3 (VCC) | Supply Input | Monitored power rail input; device operates and asserts reset down to 1.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38 V threshold | Guaranteed ±0.06 V tolerance at 25°C enables drop-in replacement for legacy 5V supervisors |
| No external components | Integrated timing capacitor and reference eliminate BOM cost and layout area vs. discrete RC solutions |
| 1 V valid reset operation | Ensures deterministic reset state even during severe brown-out - critical for data retention in µC flash |
| 7 µA quiescent current | Reduces standby power by >95% vs. comparable bipolar supervisors, extending battery life |
| SOT23-3 "Green" package | Lead-free, halogen-free (Br+Cl <1500 ppm, Sb <1000 ppm) - meets IPC-1752A Class 2 compliance |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from 5V DC-DC converters subject to load transients and thermal derating. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M4 MCU during input undervoltage. Use Value: 240 ms minimum reset hold time prevents spurious MCU restarts during brief line sags; 1 V operation ensures reset remains valid during converter soft-start. |
Use Scenario: Handheld glucose meter using CR2032 coin cell with voltage decay from 3.0 V to 2.0 V over service life. IC Role / Device Role / Timing Role: Brown-out detector triggering controlled shutdown before EEPROM write corruption occurs. Use Value: 7 µA supply current extends battery life beyond 2 years; 4.38 V threshold aligns with 5V LDO dropout margin in battery-fed analog front-end. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Dual-rail 5V/3.3V power domain in Ethernet switch ASIC subsystem with shared reset tree. IC Role / Device Role / Timing Role: Primary 5V supervisor coordinating reset sequencing with secondary 3.3V supervisor via daisy-chained RESET outputs. Use Value: Push-pull output eliminates external pull-up, reducing component count; 6 kV HBM rating withstands field ESD during hot-plug module insertion. |
Use Scenario: AMI meter with isolated RS-485 interface and tamper-detection circuitry requiring fail-safe power monitoring. IC Role / Device Role / Timing Role: Supervisory watchdog ensuring secure boot integrity after AC power interruption or lightning-induced surge. Use Value: 30 ppm/°C tempco maintains threshold accuracy across –25°C to +70°C operating range; SOT23-3 footprint fits constrained meter PCB real estate. |
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 | 4.63 V threshold, 140–280 ms reset timeout, 10 µA ICC | Higher threshold suits 5V systems with tighter regulation; shorter min timeout may not meet all µP specs | Select if system requires higher trip point and can tolerate reduced reset duration margin |
| TPS3808G33DBVR | 3.3 V threshold, adjustable delay (1.25 ms–10 s), 2.5 µA ICC | Fixed 3.3 V trip unsuitable for 5V monitoring; programmable delay adds flexibility but increases BOM cost | Use only for 3.3V domains; not a functional substitute for APX809S-44SA-7's 4.38 V detection |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX809S-44SA-7 uniquely combines 4.38 V precision threshold, 240 ms guaranteed reset hold, and 7 µA ultra-low ICC in a cost-optimized SOT23-3 package - making it the optimal choice for fixed 5V brown-out detection where timing margin and power efficiency are critical.
Availability
APX809S-44SA-7 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for APX809S-44SA-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 APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for cost-sensitive, space-constrained applications requiring precise, low-power voltage monitoring without external components.
FAQ
What is the exact reset threshold voltage of APX809S-44SA-7 at 25°C?
The APX809S-44SA-7 has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.32 V to 4.44 V per the DS39140 datasheet. This value is factory-trimmed and specified under recommended operating conditions with VCC ≥ 1.02 × VTH.
Can APX809S-44SA-7 operate with VCC below 2.0 V?
Yes - the device guarantees correct RESET logic state down to VCC = 1.0 V, and its internal comparator remains functional throughout the 1.0 V to 5.5 V operating range. This enables reliable brown-out detection during battery discharge or low-voltage startup sequences.
Does APX809S-44SA-7 require an external pull-up resistor on the RESET pin?
No - it features a push-pull output stage that actively drives both HIGH and LOW states. The RESET pin sources current when deasserted and sinks up to 1.2 mA when asserted, eliminating the need for an external pull-up resistor and reducing BOM count.
Is APX809S-44SA-7 compatible with lead-free reflow soldering processes?
Yes - it uses a fully RoHS-compliant, lead-free, halogen-free "Green" molding compound and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). The SOT23-3 package is qualified for standard Pb-free reflow profiles up to 260°C peak temperature.
APX809S-44SA-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:
- 4.38V
- 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-44SA-7 FAQ
1.How can I place an order for APX809S-44SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-44SA-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-44SA-7 reliable?
The price and inventory of APX809S-44SA-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-44SA-7 is usually 5 days.
3.What payment methods are accepted for APX809S-44SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-44SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-44SA-7?
APX809S-44SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-44SA-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-44SA-7?
For technical support, including APX809S-44SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-44SA-7 requirements.
6.How does Aetrix verify that APX809S-44SA-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-44SA-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-44SA-7 meets industry standards.
7.What is the process for return or replacement of APX809S-44SA-7?
All APX809S-44SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-44SA-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-44SA-7 part is unused and in its original packaging.
Return procedure for APX809S-44SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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