My Inquiry
My Account
Diodes Incorporated APX803S-31SR-7
- Part No.:
- APX803S-31SR-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803S-31SR-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:9,570
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
APX803S-31SR-7 from Diodes Incorporated is a 3-pin SOT23 open-drain microprocessor reset supervisor IC designed for 3.3V power supply monitoring. It asserts an active-low RESET signal during power-up, brownout, or VCC drop below 3.08V (typical threshold), maintains reset for ≥140ms after VCC recovers, and guarantees valid output down to VCC = 1V. Used in portable controllers and embedded systems requiring reliable power-on initialization.
For engineers reviewing the APX803S-31SR-7 datasheet, APX803S-31SR-7 pinout, APX803S-31SR-7 application, or APX803S-31SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.05V), 240ms typical timeout, 10µA supply current, open-drain output compatibility with bidirectional µP reset pins, and SOT23-SR package footprint.
Technical Context
The APX803S-31SR-7 implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to monitor VCC against a fixed 3.08V threshold. Its internal timer initiates only after VCC rises above VTH and holds RESET low for a guaranteed minimum 140ms, independent of VCC slew rate up to 100V/µs.
With open-drain RESET output, it supports wired-OR configurations and level-shifting across supply domains. The device remains functional and asserts valid logic states over –40°C to +85°C and operates with VCC as low as 1.0V, enabling robust reset behavior during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.04V–3.13V (min–max at +25°C); ensures reliable assertion before 3.3V system logic fails |
| Reset Timeout | 140–280ms (min–max); guarantees µP reset hold time exceeds boot ROM access latency |
| Supply Current | 10µA (typ); enables multi-year battery life in always-on portable monitoring circuits |
| VCC Operating Range | 1.0V–5.5V; allows valid reset assertion even during severe undervoltage conditions |
| Output Type | Open-drain active-low; supports pull-up to separate voltage rail and bidirectional µP reset pin interfacing |
| ESD Protection | 3kV HBM; meets industrial I/O robustness requirements without external protection |
| Tempco | 30ppm/°C; limits threshold drift to ±15mV over –40°C to +85°C operating range |
Pinout & Package
SOT23-3 (SR package) - surface-mount, 2.9mm × 1.3mm × 1.0mm body, gull-wing leads, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and timer; must be low-impedance |
| 2 | VCC | Primary power input; supplies internal circuitry and defines monitored supply domain |
| 3 | RESET | Open-drain active-low output; requires external pull-up resistor to define logic-high level |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | ±0.05V tolerance at +25°C ensures accurate detection of 3.3V rail collapse before logic corruption |
| Guaranteed reset validity to 1V | Enables deterministic reset assertion even when VCC collapses below µP operational minimum |
| 10µA typical supply current | Reduces quiescent load on battery-backed rails in always-on supervisory applications |
| Open-drain output stage | Permits shared reset bus with multiple supervisors and level translation between supply domains |
| 232°C/W θJA thermal resistance | Supports operation in compact enclosures without forced airflow or heatsinking |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and brownout recovery in DIN-rail mounted programmable logic controllers with 3.3V FPGA and ARM Cortex-M7 core. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-low signal to both FPGA configuration logic and microcontroller reset pin during AC line sag. Use Value: 240ms typical timeout exceeds FPGA configuration time (180ms), preventing partial bitstream loading and system lockup. |
Use Scenario: Battery-powered ECG data logger with ultra-low-power MCU and analog front-end powered from regulated 3.3V LDO. IC Role / Device Role / Timing Role: Ensures clean reset initiation on battery insertion and prevents spurious wakeups during Li-ion voltage droop under pulse load. Use Value: 10µA supply current extends shelf life >5 years in storage; 1V VCC operation detects end-of-battery before system instability. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Dual-supply metering SoC (3.3V digital, 2.5V ADC) subjected to transient surges on mains-coupled power rails. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and drives reset to SoC via open-drain bus shared with secondary supervisor on 2.5V rail. Use Value: Open-drain output enables wired-OR reset arbitration; 30ppm/°C tempco maintains accuracy across –25°C to +70°C meter enclosure temperature swing. |
Use Scenario: Low-voltage brownout detection in 12V-to-3.3V converted subsystem powering door module MCU and LIN transceivers. IC Role / Device Role / Timing Role: Resets MCU when ignition-derived 3.3V rail dips below 3.08V during cranking or alternator ripple events. Use Value: 3kV HBM ESD rating withstands automotive board-level ESD events; SOT23-SR footprint matches IPC-7351B land pattern for automated assembly. |
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-31SA-7 | Push-pull RESET output (vs. open-drain); identical 3.08V threshold and 240ms timeout | Requires no external pull-up; incompatible with wired-OR or level-shifted reset buses | Select when driving single-load µP with dedicated reset line and minimal BOM count priority |
| MAX809TRD33+T | 3.08V threshold, 140ms min timeout, push-pull output, 20µA ICC (vs. 10µA) | Higher supply current reduces battery lifetime; lacks VCC = 1V guarantee and 3kV HBM rating | Select only if legacy MAX809 footprint compatibility is mandatory and ESD robustness is not required |
Compared with APX809S-31SA-7 and MAX809TRD33+T, the APX803S-31SR-7 uniquely combines ultra-low 10µA current, open-drain flexibility, and guaranteed 1V operation-making it optimal for battery-sensitive, multi-rail, or high-ESD environments where reset bus sharing or deep brownout detection is critical.
Availability
APX803S-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 across extended temperature ranges and long production lifecycles.
Supply support for APX803S-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 integrated circuits, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The APX803S series belongs to Diodes' precision voltage supervisor product line, engineered specifically for cost-sensitive, space-constrained embedded systems requiring dependable power-on reset and brownout immunity without external components.
FAQ
What is the exact reset threshold voltage for APX803S-31SR-7 at +25°C?
The APX803S-31SR-7 has a guaranteed reset threshold of 3.04V (min), 3.08V (typ), and 3.13V (max) at +25°C, corresponding to the "31" suffix denoting 3.08V nominal. This is verified in the Electrical Characteristics table of DS39161 Rev. 2–2, page 3.
Does APX803S-31SR-7 support operation below 1.0V VCC?
No. The device guarantees valid RESET output only down to VCC = 1.0V. Below that, the internal circuitry ceases to function and RESET becomes high-impedance. This is explicitly stated in the Functional Description section (page 5) and confirmed in the Recommended Operating Conditions table (page 3).
Can APX803S-31SR-7 drive a reset line shared with other open-drain supervisors?
Yes. Its open-drain RESET output is designed for wired-OR configurations. Multiple APX803S-31SR-7 devices-or compatible open-drain supervisors-can share a single reset bus with one external pull-up resistor, as described in the "Interfacing to µP with Bidirectional RESET Pins" section (page 5).
What is the difference between SA and SR package variants of APX803S-31?
The SA and SR variants use identical SOT23-3 die but differ in pinout orientation: SA has GND–VCC–RESET (pin 1–2–3), while SR has GND–RESET–VCC (pin 1–2–3). The "SR" suffix in APX803S-31SR-7 confirms the latter pin assignment, as documented in the Pin Assignments diagram (page 2) and Marking Information table (page 7).
APX803S-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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803S-31SR-7 FAQ
1.How can I place an order for APX803S-31SR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803S-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 APX803S-31SR-7 reliable?
The price and inventory of APX803S-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 APX803S-31SR-7 is usually 5 days.
3.What payment methods are accepted for APX803S-31SR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803S-31SR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803S-31SR-7?
APX803S-31SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803S-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 APX803S-31SR-7?
For technical support, including APX803S-31SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803S-31SR-7 requirements.
6.How does Aetrix verify that APX803S-31SR-7 is sourced from the original manufacturer or authorized distributors?
All APX803S-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 APX803S-31SR-7 meets industry standards.
7.What is the process for return or replacement of APX803S-31SR-7?
All APX803S-31SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803S-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 APX803S-31SR-7 part is unused and in its original packaging.
Return procedure for APX803S-31SR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX803S-31SR-7 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
