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Diodes Incorporated APX809S-44SR-7
- Part No.:
- APX809S-44SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX809S-44SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
APX809S-44SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in digital systems powered by +5V rails. It provides active-low reset assertion when VCC drops below 4.38V (typ), maintains reset for ≥240ms after recovery, and operates with 7µA supply current (typ) down to VCC = 1V. Used in portable equipment and embedded controllers requiring reliable power-on reset.
For engineers reviewing the APX809S-44SR-7 datasheet, APX809S-44SR-7 pinout, APX809S-44SR-7 application, or APX809S-44SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.06V), guaranteed operation at 1V supply, push-pull output drive capability, and SOT23-SR package compatibility with space-constrained PCB layouts.
Technical Context
The APX809S-44SR-7 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.38V (typ) threshold with ±30ppm/°C temperature coefficient. Its internal timer ensures minimum 240ms reset pulse width after VCC exceeds threshold, independent of external components.
Designed for low-noise immunity, the reset comparator rejects fast transients on VCC, and the push-pull output guarantees valid logic states across the full 1.0–5.5V operating range - including during brown-out conditions where VCC falls to 1V while maintaining RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), ±0.06V tolerance - ensures reliable detection of +5V rail undervoltage before system instability |
| Supply Current | 7µA (typ) - enables multi-year battery life in portable devices without compromising reset timing |
| Reset Pulse Width | 240ms (min) - satisfies µP power-on reset timing requirements per Intel/ARM specifications |
| Operating Voltage Range | 1.0V to 5.5V - supports reset assertion during deep brown-out and full functionality at nominal +5V |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces BOM count |
| Temp Coefficient | 30ppm/°C - maintains threshold stability across -40°C to +125°C industrial ambient range |
Pinout & Package
SOT23-SR (3-pin) surface-mount package with 2.4mm × 1.3mm footprint, 0.95mm height, and gull-wing leads - optimized for automated placement and reflow soldering in high-density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane |
| 2 | RESET | Active-low push-pull reset output; sinks ≥1.2mA at 0.3V max - directly drives µP RESET# input |
| 3 | VCC | Power supply input; powers internal circuitry and defines monitored rail - no decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold calibration | 4.38V ±0.06V at +25°C - eliminates factory trimming and reduces production test time |
| No external components required | Self-contained reset generation - removes discrete RC network, saving 2–3 mm² PCB area |
| Valid reset at 1V supply | Guaranteed RESET# assertion down to VCC = 1V - enables fail-safe shutdown during severe brown-out |
| Transient-immune comparator | Rejects <20µs VCC glitches - prevents spurious resets in noisy automotive or industrial environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controllers exposed to 24VDC supply ripple and thermal cycling. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET# to ARM Cortex-M7 MCU during 5V rail sag below 4.38V. Use Value: 240ms minimum reset hold time ensures full register initialization before firmware execution begins. | Use Scenario: Battery-powered ECG device with Li-ion supply and ultra-low-power sleep mode. IC Role / Device Role / Timing Role: Voltage detector enabling safe wake-up sequence only after stable 5V LDO output is confirmed. Use Value: 7µA quiescent current extends battery runtime by >15% versus comparable micropower supervisors. |
| Embedded Network Routers | Automotive Infotainment Head Units |
Use Scenario: Multi-rail power sequencing in fanless SOHO routers with 5V main rail and 3.3V I/O domain. IC Role / Device Role / Timing Role: Dedicated 5V supervisor ensuring clean boot of MIPS-based SoC before peripheral initialization. Use Value: Push-pull output eliminates pull-up resistor, reducing thermal drift impact on reset timing accuracy. | Use Scenario: 12V-to-5V converted supply monitoring in head unit mainboard subjected to load dump transients. IC Role / Device Role / Timing Role: Reset generator holding MCU in reset during 5V rail collapse caused by alternator switching noise. Use Value: 30ppm/°C tempco ensures threshold deviation <±12mV over -40°C to +105°C under hood environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SXR44+T | 4.39V threshold, 14µA ICC (typ), open-drain output | Requires external pull-up; higher supply current reduces battery life | Select if legacy design uses open-drain interface and board layout cannot accommodate push-pull timing margin |
| TPS3808G33DBVR | 3.3V threshold (fixed), adjustable delay option, 16µA ICC (typ) | Not suitable for +5V rail monitoring; requires external capacitor for delay tuning | Choose only for 3.3V systems needing programmable reset timeout - not a functional substitute for APX809S-44SR-7 |
Compared with MAX809SXR44+T and TPS3808G33DBVR, the APX809S-44SR-7 delivers lower quiescent current, guaranteed 1V operation, and push-pull output - making it optimal for space- and power-constrained +5V embedded systems where BOM simplification and brown-out resilience are critical.
Availability
APX809S-44SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, embedded network routers, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for APX809S-44SR-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, serving industrial, computing, consumer, and communications markets with high-reliability, cost-optimized components.
The APX809S/810S series belongs to Diodes' µP supervisory product line - engineered specifically for low-power, high-accuracy voltage monitoring in resource-constrained embedded systems without external passive components.
FAQ
What is the exact reset threshold voltage for APX809S-44SR-7?
The APX809S-44SR-7 has a nominal reset threshold of 4.38V at +25°C, with guaranteed min/max values of 4.32V and 4.44V across temperature and process variation. This value is laser-trimmed during production and specified in the Electrical Characteristics table of DS39140 Rev. 2–2.
Does APX809S-44SR-7 require an external capacitor for reset timing?
No. The APX809S-44SR-7 integrates a precision internal timer that guarantees ≥240ms reset pulse width after VCC rises above threshold. No external capacitor or resistor is needed - unlike many competing supervisors that rely on RC networks for timing control.
Can APX809S-44SR-7 operate with a 3.3V supply?
Yes - it functions across 1.0V to 5.5V, but its 4.38V threshold means it will assert reset continuously when powered from 3.3V. It is intended for monitoring +5V rails; for 3.3V systems, use APX809S-31SR-7 (3.08V threshold) instead.
Is the SOT23-SR package pin-compatible with SOT23-SA?
No. SOT23-SR uses pin 1 = GND, pin 2 = RESET, pin 3 = VCC; SOT23-SA uses pin 1 = RESET, pin 2 = GND, pin 3 = VCC. Layouts must be verified using Diodes' official package drawings - mixing footprints causes functional failure.
APX809S-44SR-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-44SR-7 FAQ
1.How can I place an order for APX809S-44SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX809S-44SR-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-44SR-7 reliable?
The price and inventory of APX809S-44SR-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-44SR-7 is usually 5 days.
3.What payment methods are accepted for APX809S-44SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S-44SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX809S-44SR-7?
APX809S-44SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX809S-44SR-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-44SR-7?
For technical support, including APX809S-44SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S-44SR-7 requirements.
6.How does Aetrix verify that APX809S-44SR-7 is sourced from the original manufacturer or authorized distributors?
All APX809S-44SR-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-44SR-7 meets industry standards.
7.What is the process for return or replacement of APX809S-44SR-7?
All APX809S-44SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S-44SR-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-44SR-7 part is unused and in its original packaging.
Return procedure for APX809S-44SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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