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Diodes Incorporated APX803-31SAG-7
- Part No.:
- APX803-31SAG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803-31SAG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
APX803-31SAG-7 from Diodes Incorporated is a 3-pin SOT23 microprocessor reset supervisor IC with 3.08 V ±0.05 V precision reset threshold, open-drain active-low RESET output, and 200 ms typical reset timeout period. It monitors 3.3 V digital power rails in embedded controllers and portable systems, asserting reset during power-up, brownout, or supply glitches down to VCC = 1 V.
For engineers reviewing the APX803-31SAG-7 datasheet, APX803-31SAG-7 pinout, APX803-31SAG-7 application, or APX803-31SAG-7 equivalent, key selection criteria include reset threshold accuracy (±0.05 V), guaranteed reset validity at low VCC (1 V), open-drain interface compatibility with bidirectional µP reset pins, and SOT23 footprint constraints for space-constrained designs.
Technical Context
The APX803-31SAG-7 implements a precision bandgap-based voltage comparator with 30 ppm/°C tempco and 40 mV hysteresis to reject supply transients. Its internal oscillator drives a fixed 200 ms timeout timer after VCC rises above the 3.08 V threshold.
It features an N-channel open-drain output stage capable of sinking ≥1.2 mA at VCC = 3.08 V − 0.2 V with VOL ≤ 0.3 V, and operates across −40 °C to +85 °C ambient with supply current as low as 30 µA (typ.) at 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V (typ.), 3.04–3.13 V (min–max); ensures reliable reset assertion for 3.3 V systems under worst-case temp/voltage drift |
| Reset Timeout Period | 200 ms (typ.), 140–280 ms (min–max); guarantees µP initialization completes before release |
| Supply Current | 30 µA (typ.) at 25 °C; enables battery-powered operation with negligible standby drain |
| Reset Output Type | Open-drain active-low; allows wired-OR with other reset sources and level-shifting across supply domains |
| Valid Reset Down To | VCC = 1 V; maintains defined logic state during deep brownout, preventing metastability |
| Tempco | 30 ppm/°C; limits threshold drift to <±15 mV over −40 °C to +85 °C operating range |
| Hysteresis | 40 mV; prevents chatter during slow-rising/falling VCC transitions near threshold |
Pinout & Package
APX803-31SAG-7 is housed in a RoHS-compliant, halogen-free SOT23-3 (SA) package with 2.4 mm × 1.3 mm footprint and 0.95 mm height. Pin 1 is GND, Pin 2 is VCC, Pin 3 is open-drain RESET.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be low-impedance to avoid noise-induced false resets |
| 2 (VCC) | Supply input | Monitored power rail input; also powers internal circuitry; valid from 1.1 V to 5.5 V |
| 3 (RESET) | Open-drain reset output | Active-low signal asserted when VCC < 3.08 V; requires external pull-up to system reset domain voltage |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 3.08 V ±0.05 V at 25 °C with 30 ppm/°C drift - eliminates need for external trimming in 3.3 V systems |
| Fixed 200 ms reset timeout | Guaranteed minimum 140 ms ensures µP core, PLLs, and peripherals fully stabilize before release |
| Open-drain output stage | Sinks ≥1.2 mA at VCC = 2.88 V with VOL ≤ 0.3 V - supports direct interface to 1.8 V–5 V µP reset pins |
| Low 30 µA supply current | Enables >10-year battery life in coin-cell–powered IoT sensors and portable instrumentation |
| Valid reset down to VCC = 1 V | Maintains deterministic logic state during deep undervoltage - prevents undefined µP behavior prior to shutdown |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and brownout protection in DIN-rail mounted programmable logic controllers with dual 3.3 V/5 V rails. IC Role / Device Role / Timing Role: Primary reset supervisor for ARM Cortex-M7 microcontroller; asserts reset on 3.3 V rail dip below 3.08 V for ≥140 ms. Use Value: Prevents firmware corruption during factory floor voltage sags by guaranteeing full µP reset before code execution resumes. |
Use Scenario: Battery-backed vital signs monitor requiring fail-safe startup and low-power sleep mode recovery. IC Role / Device Role / Timing Role: System-level reset generator tied to main 3.3 V LDO; holds reset until regulated supply stabilizes post-battery insertion. Use Value: Eliminates external RC timing network, reducing BOM count and PCB area while maintaining ±0.05 V threshold accuracy over temperature. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Supervision of 3.3 V PHY and switch controller supplies in fanless enterprise routers exposed to thermal cycling. IC Role / Device Role / Timing Role: Voltage monitor for Ethernet PHY IC; triggers hardware reset if 3.3 V rail drops during thermal throttling events. Use Value: 30 ppm/°C tempco ensures reset threshold remains within 15 mV of nominal across −40 °C to +85 °C ambient, avoiding spurious resets. |
Use Scenario: Tamper-resistant metering platform with isolated MCU and metrology ADC powered from split 3.3 V/2.5 V rails. IC Role / Device Role / Timing Role: Single-point reset source for both domains using open-drain output pulled up to 3.3 V rail. Use Value: Enables level-shifted reset assertion to 2.5 V metrology subsystem without additional level translators or isolation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803D-29SAG-7 | 2.93 V threshold, 1 ms reset timeout (vs. 3.08 V / 200 ms) | Targeted for 3.0 V systems; insufficient timeout for most µP initialization sequences | Select only when supervising lower-voltage rails where fast reset release is required |
| TPS3808G33DBVR | 3.3 V threshold, push-pull output, 200 ms timeout, higher ICC (12 µA min) | Eliminates external pull-up but lacks open-drain flexibility for multi-source reset buses | Prefer when board layout prohibits pull-up resistors or when driving capacitive loads >100 pF |
Compared with APX803D-29SAG-7, the APX803-31SAG-7 provides longer reset hold time essential for complex µP boot sequences; compared with TPS3808G33DBVR, it offers open-drain interoperability with legacy reset architectures but requires a pull-up resistor.
Availability
APX803-31SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network edge routers, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for APX803-31SAG-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' precision voltage supervisor product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications requiring guaranteed timing and low quiescent current.
FAQ
What is the minimum VCC required for the APX803-31SAG-7 to assert a valid RESET signal?
The APX803-31SAG-7 guarantees RESET remains a valid logic low down to VCC = 1.0 V. Below this voltage, the output enters high-impedance state and no longer sinks current. This ensures deterministic reset behavior during deep brownout conditions common in battery-powered systems before complete power loss.
Can the APX803-31SAG-7 be used with a 1.8 V microcontroller reset input?
Yes - its open-drain RESET output can be pulled up to 1.8 V using an external resistor. The device sinks ≥1.2 mA at VCC = 2.88 V with VOL ≤ 0.3 V, ensuring compatible logic levels. No level-shifter is needed, but the pull-up must connect to the target µP's VDDIO rail, not the monitored 3.3 V supply.
How does the 40 mV hysteresis affect system reliability during slow-rising VCC?
The 40 mV hysteresis prevents oscillatory reset assertion when VCC ramps slowly through the 3.08 V threshold. It ensures RESET releases only after VCC exceeds 3.12 V and reasserts only after falling below 3.08 V, eliminating multiple reset pulses that could corrupt µP firmware during marginal power-up conditions.
Is the APX803-31SAG-7 pin-compatible with the APX803-31SRG-7?
Yes - both use identical SOT23-3 footprints and pinout (GND-VCC-RESET), differing only in package variant (SA vs. SR) and marking. SA has standard leadframe plating; SR uses matte tin. Mechanical dimensions and solder reflow profiles are identical, enabling drop-in replacement in existing layouts.
APX803-31SAG-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:
- Not For New Designs
- 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803-31SAG-7 FAQ
1.How can I place an order for APX803-31SAG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803-31SAG-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 APX803-31SAG-7 reliable?
The price and inventory of APX803-31SAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803-31SAG-7 is usually 5 days.
3.What payment methods are accepted for APX803-31SAG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803-31SAG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803-31SAG-7?
APX803-31SAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803-31SAG-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 APX803-31SAG-7?
For technical support, including APX803-31SAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803-31SAG-7 requirements.
6.How does Aetrix verify that APX803-31SAG-7 is sourced from the original manufacturer or authorized distributors?
All APX803-31SAG-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 APX803-31SAG-7 meets industry standards.
7.What is the process for return or replacement of APX803-31SAG-7?
All APX803-31SAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803-31SAG-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 APX803-31SAG-7 part is unused and in its original packaging.
Return procedure for APX803-31SAG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX803-31SAG-7 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP130T-315I/TT
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MCP120T-475I/TT
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