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Diodes Incorporated APX803S-44SA-7
- Part No.:
- APX803S-44SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803S-44SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
APX803S-44SA-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 5.0V systems, featuring a precision 4.38V (typ) reset threshold, 240ms (typ) reset timeout, 10µA supply current, and guaranteed operation down to VCC = 1V. It monitors power supply integrity during power-up, brownout, and power-down in embedded controllers and portable equipment.
For engineers reviewing the APX803S-44SA-7 datasheet, APX803S-44SA-7 pinout, APX803S-44SA-7 application, or APX803S-44SA-7 equivalent, key selection criteria include reset threshold accuracy (±0.07V), open-drain output compatibility with bidirectional µP reset pins, fixed 240ms timeout timing, and SOT23-3 SA package footprint.
Technical Context
The APX803S-44SA-7 implements a precision bandgap-based voltage comparator with 30ppm/°C tempco and internal timer logic that asserts an active-low open-drain RESET signal when VCC falls below 4.38V (typ), holding it low for ≥140ms after VCC recovers above threshold. Its design ignores fast transients on VCC and guarantees valid reset assertion down to 1V supply.
It features no external components required for basic operation, supports direct interface to CMOS and TTL inputs via pull-up resistor, and enables level-shifting across supply domains due to its open-drain architecture - critical for multi-rail systems supervising a single µP reset input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (typ), ±0.07V tolerance - ensures reliable detection of 5.0V rail collapse before µP instability. |
| Reset Timeout | 240ms (typ), ≥140ms min - provides sufficient hold time for full µP initialization after power recovery. |
| Supply Current | 10µA (typ) at +25°C - enables use in battery-powered systems without significant standby drain. |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions. |
| Output Type | Open-drain, active-low - allows wired-OR configuration and voltage-level translation with external pull-up. |
| Temperature Range | -40°C to +85°C - fully specified for industrial-grade embedded applications. |
| VCC Transient Immunity | dVCC/dt ≤ 100V/µs - rejects fast supply glitches without false triggering. |
Pinout & Package
APX803S-44SA-7 is housed in a RoHS-compliant, lead-free SOT23-3 (SA) surface-mount package with 2.4mm × 1.3mm footprint and 0.915mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and timer; must be connected to system ground plane for stable threshold reference. |
| 2 | VCC | Power supply input; monitors the 5.0V rail directly - no external divider needed for nominal operation. |
| 3 | RESET | Open-drain active-low output; requires external pull-up resistor (typically 10kΩ) to target logic supply (e.g., 3.3V or 5.0V). |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38V threshold | Guaranteed 4.31–4.45V over temperature - eliminates manual calibration for 5.0V systems. |
| Fixed 240ms reset timeout | Ensures µP completes boot sequence before release; avoids race conditions in firmware startup. |
| Open-drain output stage | Enables shared reset bus with multiple supervisors or µP-initiated reset assertion via same line. |
| 1V minimum operating voltage | Maintains valid reset state during severe brownout - prevents premature release before VCC stabilizes. |
| 10µA supply current | Reduces quiescent power by >95% vs. discrete reset solutions - critical for coin-cell or energy-harvesting designs. |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controllers with 5.0V FPGA and ARM Cortex-M7 core. IC Role / Device Role / Timing Role: Primary power-on reset generator and brownout detector for main processor domain. Use Value: Prevents corrupted register states during unstable 5.0V rail startup; 240ms timeout aligns with FPGA configuration time. |
Use Scenario: Battery-backed vital signs monitor with dual-supply architecture (5.0V analog front-end, 3.3V MCU). IC Role / Device Role / Timing Role: Supervises 5.0V rail and drives shared reset line pulled to 3.3V for MCU and ADC. Use Value: Open-drain output enables safe level-shifted reset assertion without level translators or additional logic. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Reset supervision in 12V-to-5.0V converted subsystems for door module ECUs. IC Role / Device Role / Timing Role: Detects undervoltage on post-regulation 5.0V rail caused by load dump or cold-crank transients. Use Value: 30ppm/°C tempco ensures consistent 4.38V trip point across -40°C to +85°C under hood environments. |
Use Scenario: Tamper-resistant electricity meter with isolated power domains and secure bootloader. IC Role / Device Role / Timing Role: Guarantees secure reset during AC mains dropout or capacitor discharge events. Use Value: Valid reset assertion down to 1.0V VCC prevents partial execution of cryptographic routines during power decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX809S-44SA-7 | Push-pull (not open-drain) RESET output; identical 4.38V threshold and 240ms timeout. | Requires no external pull-up; incompatible with wired-OR or level-shifted reset buses. | Select when driving single-load CMOS input directly and board space prohibits pull-up resistor placement. |
| MAX809SEUR+T | 4.63V reset threshold (±2.5%), 240ms timeout, push-pull output, 1.2µA max ICC. | Higher threshold unsuitable for 5.0V systems with <10% tolerance; lower current benefits ultra-low-power designs. | Select only if system rail is 4.75–5.25V and absolute lowest quiescent current is prioritized over threshold match. |
Compared with APX803S-44SA-7, APX809S-44SA-7 simplifies BOM by eliminating the pull-up resistor but sacrifices bus-sharing capability; MAX809SEUR+T offers lower current but misaligns with 5.0V system margin requirements due to its 4.63V threshold.
Availability
APX803S-44SA-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 APX803S-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 integrated circuits, specializing in high-performance, cost-effective power management, signal integrity, and protection solutions.
The APX803S series belongs to Diodes' µP supervisor product line, engineered specifically for reliable, low-component-count power monitoring in space-constrained embedded systems operating across industrial and portable environments.
FAQ
What is the exact reset threshold voltage for APX803S-44SA-7?
The APX803S-44SA-7 has a guaranteed reset threshold range of 4.31V to 4.45V at +25°C, with a typical value of 4.38V. This specification is fully characterized from -40°C to +85°C, exhibiting a maximum tempco of 30ppm/°C, ensuring stable trip point across industrial temperature ranges.
Can APX803S-44SA-7 drive a 3.3V microcontroller reset pin from a 5.0V monitored rail?
Yes - its open-drain RESET output allows direct connection to a 3.3V pull-up resistor, enabling safe level-shifted reset assertion. The device guarantees valid logic-low output down to VCC = 1V, and RESET remains asserted until VCC exceeds 4.38V and the 240ms timeout expires.
Is an external capacitor required for the reset timeout function?
No - the 240ms reset timeout is generated by an internal RC timer; no external capacitor or resistor is needed. This eliminates component count, board area, and tolerance-related timing drift, distinguishing it from adjustable-reset ICs like the MAX6326.
Does APX803S-44SA-7 meet automotive AEC-Q200 requirements?
No - APX803S-44SA-7 is qualified for industrial temperature range (-40°C to +85°C) and is not AEC-Q200 stress-tested or certified. For automotive applications, Diodes offers the AEC-Q100 qualified APX810S series with identical functionality and enhanced reliability screening.
APX803S-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:
- Open Drain or Open Collector
- 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
APX803S-44SA-7 FAQ
1.How can I place an order for APX803S-44SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803S-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 APX803S-44SA-7 reliable?
The price and inventory of APX803S-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 APX803S-44SA-7 is usually 5 days.
3.What payment methods are accepted for APX803S-44SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803S-44SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803S-44SA-7?
APX803S-44SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803S-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 APX803S-44SA-7?
For technical support, including APX803S-44SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803S-44SA-7 requirements.
6.How does Aetrix verify that APX803S-44SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803S-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 APX803S-44SA-7 meets industry standards.
7.What is the process for return or replacement of APX803S-44SA-7?
All APX803S-44SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803S-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 APX803S-44SA-7 part is unused and in its original packaging.
Return procedure for APX803S-44SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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