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Diodes Incorporated APX803S05-31SR-7
- Part No.:
- APX803S05-31SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803S05-31SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
APX803S05-31SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 3.08 V ±0.05 V supply monitoring with 50 ms typical reset timeout, 10 µA typical supply current, and guaranteed reset validity down to VCC = 1 V. It provides power-on and brownout reset assertion for embedded microcontrollers in portable and industrial systems.
For engineers reviewing the APX803S05-31SR-7 datasheet, APX803S05-31SR-7 pinout, APX803S05-31SR-7 application, or APX803S05-31SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.05 V), open-drain output compatibility with bidirectional µP reset pins, temperature-stable 30 ppm/°C tempco, and SOT23-SR package footprint alignment with layout constraints.
Technical Context
The APX803S05-31SR-7 integrates a precision voltage comparator with hysteresis and an internal timer to generate a fixed-duration active-low reset pulse upon VCC crossing the 3.08 V threshold. Its open-drain output requires an external pull-up resistor and supports level-shifting across supply domains.
It operates over -40°C to +85°C with full electrical specification, ignores fast VCC transients via built-in noise immunity, and maintains valid logic state (RESET low) for VCC ≥ 1 V - enabling reliable reset assertion during deep brownout conditions before system power collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.04 V to 3.13 V (typ. 3.08 V) - ensures stable reset assertion for 3.3 V nominal supplies with ±2% tolerance margin |
| Reset Timeout | 20 ms to 70 ms (typ. 50 ms) - guarantees sufficient hold time for µP initialization without excessive boot delay |
| Supply Current | 10 µA typ. at +25°C - enables battery-powered operation with negligible quiescent drain |
| VCC Operating Range | 1.0 V to 5.5 V - supports reset assertion down to ultra-low VCC, critical for graceful shutdown sequencing |
| Reset Output Type | Open-drain active-low - allows wired-OR configuration and interface with bidirectional µP reset pins |
| Tempco | 30 ppm/°C - maintains threshold stability across industrial temperature range without calibration |
| ESD Protection | 3 kV HBM - meets IEC 61000-4-2 Level 2 for board-level robustness in end equipment |
Pinout & Package
The APX803S05-31SR-7 is housed in a RoHS-compliant SOT23-3 (SR variant) package with gull-wing leads, 2.9 mm × 1.3 mm body size, and 0.95 mm pitch. Pin 1 is GND, Pin 2 is VCC, and Pin 3 is RESET - matching the SR pinout configuration per Diodes' DS39161 Rev. 2-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and timer; must be low-impedance connection to system ground plane |
| 2 | VCC | Power input supplying both internal circuitry and reset threshold reference; accepts 1.0–5.5 V with no external decoupling required |
| 3 | RESET | Open-drain active-low output; sinks up to 3.5 mA at 0.4 V - requires external pull-up to monitored or host supply rail |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | ±0.05 V tolerance at +25°C ensures accurate reset timing for 3.3 V systems without trimming components |
| 50 ms reset timeout | Typical duration balances µP startup requirements against system responsiveness - avoids unnecessary delays in portable devices |
| 10 µA supply current | Enables multi-year battery life in coin-cell-powered IoT sensors and wearables where standby current is critical |
| VCC = 1 V reset validity | Guarantees RESET remains asserted until VCC recovers above threshold - prevents spurious release during brownout recovery |
| Open-drain output | Supports direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11) using single pull-up resistor |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power supervision in DIN-rail mounted programmable logic controllers operating across wide ambient temperatures and noisy 24 V DC bus environments. IC Role / Device Role / Timing Role: Reset supervisor asserting active-low signal to ARM Cortex-M7 microcontroller during 24 V supply dips below 22 V or cold-start ramp-up. Use Value: 30 ppm/°C tempco and -40°C to +85°C spec ensure consistent 3.08 V trip point across factory floor thermal swings, eliminating field recalibration. |
Use Scenario: Battery-backed vital sign monitors requiring fail-safe reset during Li-ion discharge from 4.2 V to 3.0 V and intermittent USB charging events. IC Role / Device Role / Timing Role: Monitoring regulated 3.3 V rail derived from buck converter; asserts RESET when VCC falls below 3.08 V during battery sag. Use Value: 10 µA quiescent current extends clinical-grade battery runtime beyond 72 hours between charges while maintaining deterministic 50 ms reset hold. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply architecture (mains-derived + supercap backup) requiring glitch-immune reset during AC dropout. IC Role / Device Role / Timing Role: Supervising 3.3 V microcontroller supply; ignoring <20 µs VCC transients while asserting RESET for ≥20 ms on sustained brownout. Use Value: Built-in transient immunity prevents false resets during relay switching noise, improving meter reliability in grid-edge deployments. |
Use Scenario: CAN-connected door module powered by vehicle battery (9–16 V) with LDO-regulated 3.3 V domain for MCU and sensor interface. IC Role / Device Role / Timing Role: Detecting LDO output collapse during cranking (battery dip to 6 V) and holding RESET low for 50 ms after recovery to prevent firmware corruption. Use Value: Guaranteed reset validity down to VCC = 1 V ensures assertion even during extreme undervoltage, meeting ISO 16750-2 Pulse 4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 3.08 V threshold, 140 ms reset timeout, push-pull output, 15 µA ICC | Requires no pull-up resistor but lacks level-shifting capability; less suitable for bidirectional reset interfaces | Select when board space permits larger SOT23-3 footprint and push-pull drive simplifies routing |
| TPS3808G33DBVR | 3.3 V threshold, adjustable timeout (200 ms min), enable input, 12 µA ICC, SOT23-6 | 6-pin package adds enable control and tighter threshold tolerance (±0.5%), but increases BOM count and layout complexity | Select when system requires programmable reset duration or external enable coordination with PMIC sequencing |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX803S05-31SR-7 offers optimal trade-off of minimal footprint (3-pin SOT23-SR), open-drain flexibility for multi-rail systems, and industry-standard 50 ms timeout - making it preferred for cost-sensitive, space-constrained portable and industrial designs where level-shifting and low ICC are prioritized.
Availability
APX803S05-31SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for APX803S05-31SR-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 automotive markets.
The APX803S series belongs to Diodes' supervisory IC product line, engineered specifically for cost-effective, low-power microprocessor reset functionality in space-constrained embedded systems with stringent thermal and supply-voltage stability requirements.
FAQ
What is the exact reset threshold voltage for APX803S05-31SR-7?
The APX803S05-31SR-7 has a guaranteed reset threshold range of 3.04 V to 3.13 V at +25°C, with a typical value of 3.08 V. This is confirmed in Electrical Characteristics Table of DS39161 Rev. 2-2, corresponding to the "-31" suffix denoting 3.08 V nominal threshold.
Does APX803S05-31SR-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain active-low, so an external pull-up resistor to the appropriate supply rail (e.g., 3.3 V or 5 V) is mandatory. Typical values range from 10 kΩ to 100 kΩ depending on rise-time and bus capacitance requirements.
Can APX803S05-31SR-7 operate reliably below 1.0 V VCC?
No - the device guarantees correct RESET logic state only for VCC ≥ 1.0 V. Below 1.0 V, the internal circuitry ceases to function and RESET becomes high-impedance; this is intentional and aligns with most µP operational limits.
What is the difference between SA and SR package variants of APX803S?
The SA and SR variants share identical SOT23-3 mechanical dimensions but differ in pinout: SA uses Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC; SR uses Pin 1 = GND, Pin 2 = VCC, Pin 3 = RESET. APX803S05-31SR-7 uses the SR pinout, verified in Diodes' Marking Information table (page 7).
APX803S05-31SR-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:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803S05-31SR-7 FAQ
1.How can I place an order for APX803S05-31SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803S05-31SR-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 APX803S05-31SR-7 reliable?
The price and inventory of APX803S05-31SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803S05-31SR-7 is usually 5 days.
3.What payment methods are accepted for APX803S05-31SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803S05-31SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803S05-31SR-7?
APX803S05-31SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803S05-31SR-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 APX803S05-31SR-7?
For technical support, including APX803S05-31SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803S05-31SR-7 requirements.
6.How does Aetrix verify that APX803S05-31SR-7 is sourced from the original manufacturer or authorized distributors?
All APX803S05-31SR-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 APX803S05-31SR-7 meets industry standards.
7.What is the process for return or replacement of APX803S05-31SR-7?
All APX803S05-31SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803S05-31SR-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 APX803S05-31SR-7 part is unused and in its original packaging.
Return procedure for APX803S05-31SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX803S05-31SR-7 Tags
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MIC826SYMT-TR
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APX803S-31SA-7
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