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Diodes Incorporated APX803-40SRG-7
- Part No.:
- APX803-40SRG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803-40SRG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23R
- Quantity:
- Payment:
- Shipping:
Inventory:12,000
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Product details
Overview
APX803-40SRG-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with 4.00V reset threshold, open-drain active-low RESET output, and 140ms minimum reset timeout period. It monitors VCC in 5V digital systems, asserts reset during power-up and brownout events down to VCC = 1V, and requires no external components. Used in embedded controllers and portable equipment for reliable power-on initialization.
For engineers reviewing the APX803-40SRG-7 datasheet, APX803-40SRG-7 pinout, APX803-40SRG-7 application, or APX803-40SRG-7 equivalent, key selection criteria include reset threshold accuracy (±0.06V), guaranteed operation down to 1V supply, open-drain interface compatibility with bidirectional µP reset pins, and SOT23-SR package footprint constraints.
Technical Context
The APX803-40SRG-7 implements a precision bandgap-based voltage comparator with 40mV hysteresis and 30ppm/°C temperature coefficient to detect VCC drops below 4.00V. Its internal oscillator drives a monostable timer that holds RESET low for ≥140ms after VCC recovers above threshold.
Designed for direct integration into 5V microcontroller power rails, it features an open-drain N-channel output stage capable of sinking ≥1.2mA at VCC = 4.0V and VOL ≤ 0.3V, enabling pull-up to any compatible logic rail up to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±0.06V - ensures reliable reset assertion before 5V system brownout affects µP operation |
| Reset Timeout | 140ms min - guarantees sufficient hold time for full µP initialization sequence |
| Supply Current | 30µA typ - enables use in battery-powered devices without significant quiescent drain |
| VCC Operating Range | 1.1V to 5.5V - supports valid reset assertion even during deep brownout recovery |
| Output Type | Open-drain active-low - allows wired-OR with other reset sources and level-shifting across supply domains |
| Reset Hysteresis | 40mV - prevents chatter during slow VCC ramp-up or noise-induced threshold crossings |
| ESD Rating | 2kV HBM - provides robustness against handling and board-level transients |
Pinout & Package
APX803-40SRG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SR) package with gull-wing leads, 2.4mm body width, and 0.95mm pitch. Thermal resistance θJA is 201°C/W on standard FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must connect to system ground plane |
| 2 (VCC) | Supply input | Monitored power rail input; powers internal circuitry and sets comparator reference point |
| 3 (RESET) | Open-drain output | Active-low reset signal; requires external pull-up resistor to target logic rail (e.g., µP VDD) |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V threshold | ±0.06V tolerance over -40°C to +85°C ensures deterministic reset timing across industrial temperature range |
| No external components required | Integrated voltage reference, comparator, and timer eliminate discrete BOM items and layout sensitivity |
| Valid reset down to VCC = 1V | Guarantees correct logic state during deep undervoltage conditions where µP is nonfunctional |
| Open-drain output architecture | Enables shared reset bus with multiple supervisors or µP-initiated reset assertion via same line |
| SOT23-SR green package | Lead-free, halogen-free construction compliant with RoHS 2 and JEDEC MSL1 handling requirements |
Applications
| Industrial PLC Controllers | Smart Energy Meters |
|---|---|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and noisy AC mains. IC Role / Device Role / Timing Role: Supervises 5V system rail and asserts reset if input rectifier sag exceeds 4.00V threshold during load transients. Use Value: Prevents firmware corruption by ensuring µP remains held in reset until stable 5V rail is restored for ≥140ms. | Use Scenario: Battery-backed real-time clock and metrology subsystem in utility-grade electricity meters. IC Role / Device Role / Timing Role: Monitors main 5V DC-DC output and triggers controlled shutdown/reset when input capacitor discharge falls below 4.00V. Use Value: Enables safe data retention and EEPROM write completion before brownout-induced loss of regulation. |
| Point-of-Sale Terminals | Network Edge Routers |
Use Scenario: Compact retail payment terminals powered from USB-C PD or 5V wall adapters with variable load profiles. IC Role / Device Role / Timing Role: Detects adapter dropout or cable disconnect and initiates clean µP reset before voltage collapse disrupts secure boot. Use Value: Eliminates boot failures caused by marginal 5V supply transitions, improving field reliability. | Use Scenario: Multi-rail 5V/3.3V/1.2V switching infrastructure in fanless enterprise routers with thermal throttling. IC Role / Device Role / Timing Role: Dedicated 5V rail supervisor feeding FPGA configuration logic and management µC reset chain. Use Value: Provides deterministic reset coordination across heterogeneous power domains using single open-drain bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803-40SAG-7 | SOT23-SA package (different pin orientation: GND–VCC–RESET vs. GND–VCC–RESET top-view mirror); identical electrical specs | Requires PCB footprint revision due to SA pad layout offset; same thermal and timing behavior | Select SA variant only if legacy board design uses SA land pattern or preferred tape-and-reel orientation differs |
| TPS3808G33DBVR | TI part with 3.3V threshold, 200ms timeout, push-pull output, and enable input; higher ICC (12µA vs. 30µA) | Not drop-in: different threshold, output type, and pinout; requires redesign of pull-up and enable logic | Choose only when 3.3V supervision is needed or push-pull drive simplifies system-level reset arbitration |
Compared with APX803-40SRG-7, the SA variant offers identical functionality in a mechanically distinct SOT23 variant, while TPS3808G33DBVR targets different voltage domains and adds control flexibility at the cost of pin compatibility and BOM change.
Availability
APX803-40SRG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, point-of-sale terminals, and network edge routers requiring stable component supply and long-term production continuity.
Supply support for APX803-40SRG-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 APX803 series belongs to Diodes' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications requiring precision threshold detection and minimal external components.
FAQ
What is the exact reset threshold voltage and tolerance for APX803-40SRG-7?
The APX803-40SRG-7 has a nominal reset threshold of 4.00V, with a guaranteed range of 3.94V to 4.06V at +25°C. Over the full operating temperature range (-40°C to +85°C), the threshold variation is limited to ±0.06V, and the tempco is specified at 30ppm/°C.
Does APX803-40SRG-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain active-low and must be pulled up externally to a logic-compatible voltage rail (e.g., 3.3V or 5V). A typical value is 10kΩ, selected to ensure VOL ≤ 0.3V while sinking ≥1.2mA at VCC = 4.0V, per datasheet specifications.
Can APX803-40SRG-7 operate reliably below 1.1V VCC?
No - the recommended minimum VCC is 1.1V. While the RESET output is guaranteed valid down to VCC = 1.0V, operation below 1.1V violates the Recommended Operating Conditions. Below 1.1V, the internal comparator may not function correctly, and RESET becomes high-impedance without defined logic state.
Is APX803-40SRG-7 pin-compatible with APX803D-29SRG-7?
No - although both use the SOT23-SR package and share identical pinout (GND–VCC–RESET), they differ in reset threshold (4.00V vs. 2.93V) and timeout duration (140ms min vs. 1ms min). Substituting one for the other will cause incorrect reset timing or failure to assert reset under intended supply conditions.
APX803-40SRG-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:
- 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:
- SOT23R
APX803-40SRG-7 FAQ
1.How can I place an order for APX803-40SRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803-40SRG-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 APX803-40SRG-7 reliable?
The price and inventory of APX803-40SRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803-40SRG-7 is usually 5 days.
3.What payment methods are accepted for APX803-40SRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803-40SRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803-40SRG-7?
APX803-40SRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803-40SRG-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 APX803-40SRG-7?
For technical support, including APX803-40SRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803-40SRG-7 requirements.
6.How does Aetrix verify that APX803-40SRG-7 is sourced from the original manufacturer or authorized distributors?
All APX803-40SRG-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 APX803-40SRG-7 meets industry standards.
7.What is the process for return or replacement of APX803-40SRG-7?
All APX803-40SRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803-40SRG-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 APX803-40SRG-7 part is unused and in its original packaging.
Return procedure for APX803-40SRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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