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Diodes Incorporated APX803L20-34SA-7
- Part No.:
- APX803L20-34SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-34SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,615
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Product details
Overview
APX803L20-34SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.4V threshold detection with ±1.5% accuracy, 220ms reset timeout, and 1µA typical supply current in SOT23 package. It delivers active-low open-drain reset signaling for power monitoring in battery-powered IoT sensors and portable medical devices.
For engineers reviewing the APX803L20-34SA-7 datasheet, APX803L20-34SA-7 pinout, APX803L20-34SA-7 application, or APX803L20-34SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and compatibility with low-voltage microcontrollers operating down to 0.9V supply.
Technical Context
The APX803L20-34SA-7 implements a precision bandgap-based voltage reference with built-in hysteresis (0.01×VTH) to prevent oscillation during VCC recovery. Its internal comparator continuously monitors VCC against a fixed 3.4V threshold and asserts RESET when VCC drops below that level.
Reset assertion remains active until VCC exceeds 3.4V + hysteresis, followed by a guaranteed 220ms (min–max: 143–297ms) timeout before deassertion. The device operates across –40°C to +85°C ambient with no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.4V ±1.5% - ensures reliable reset initiation at defined system brown-out point |
| Supply Current | 1.0µA typical - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 220ms nominal (143–297ms range) - provides sufficient hold time for µP initialization sequences |
| Output Type | Open-drain, active-low - supports wired-OR reset bus and flexible pull-up voltage selection |
| Response Time | ≤20µs - guarantees rapid fault detection during fast VCC transients |
| Operating Voltage | 0.9V to 5.5V - supports supervision of 1.2V, 1.8V, 2.5V, 3.3V, and 5V rails |
| Hysteresis | 0.01×VTH (34mV) - prevents chatter during slow VCC recovery near threshold |
Pinout & Package
SOT23-3 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, lead-free, halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path; must be connected directly to system power plane |
| 2 | RESET | Open-drain output; requires external pull-up to logic rail (e.g., VCC or IOVDD) |
| 3 | VCC | Power input; supplies internal circuitry and sets monitored rail |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.4V threshold | Eliminates external resistor divider, reducing BOM count and layout area |
| 220ms factory-programmed delay | Matches typical µP reset timing requirements without capacitor tuning |
| ±1.5% threshold accuracy | Reduces design margin overhead vs. ±3% alternatives, enabling tighter supply design |
| 1µA supply current | Minimizes quiescent drain on energy-constrained systems such as wearable biosensors |
| –40°C to +85°C operation | Validated for industrial and extended-temperature portable equipment deployment |
Applications
| Smart Wearable Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous ECG/PPG monitoring powered by CR2032 battery with ultra-low sleep current. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset if main rail dips below 3.4V during RF transmission burst. Use Value: Prevents firmware corruption by ensuring µC only resumes execution after stable 3.3V rail recovery. |
Use Scenario: DIN-rail mounted digital input module operating from 24VDC converted to 3.3V via buck regulator. IC Role / Device Role / Timing Role: Monitors post-regulation 3.3V rail; holds system in reset during brownout events lasting <220ms. Use Value: Guarantees deterministic startup sequence and avoids spurious I/O state transitions during line fluctuations. |
| Wireless Sensor Nodes | Portable Medical Diagnostic Tools |
Use Scenario: LoRaWAN node using intermittent wake-up cycles with sub-µA deep-sleep current. IC Role / Device Role / Timing Role: Detects 3.4V threshold breach caused by battery aging or cold-temperature voltage sag. Use Value: Triggers graceful shutdown before data loss occurs, preserving last valid sensor readings in nonvolatile memory. |
Use Scenario: Handheld pulse oximeter powered by two AAA alkaline cells (1.5V × 2 = 3.0V nominal). IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts reset when cell voltage decays below usable level. Use Value: Ensures clinical-grade measurement integrity by disabling analog front-end before ADC reference drifts out of spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V threshold, 200ms delay, 1.1µA ICC, SOT23-6 package | Requires external pull-up and has larger footprint; higher pin count adds routing complexity | Prefer when dual-supply monitoring or manual delay adjustment is needed |
| MAX809SEUR+T | 3.08V threshold, 140ms delay, 10µA ICC, SOT23-3 package | Higher quiescent current limits battery life; lower threshold may trigger prematurely in 3.3V systems | Acceptable only where 3.08V trip point aligns with system brown-out specification |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the APX803L20-34SA-7 offers tighter threshold accuracy (±1.5% vs ±2%), lower ICC (1µA vs 10µA), and exact 3.4V trip matching common 3.3V LDO dropout margins-making it optimal for space- and energy-constrained designs requiring deterministic reset behavior.
Availability
APX803L20-34SA-7 is available at Aetrix Electronics and suitable for smart wearables, industrial I/O modules, wireless sensor nodes, and portable medical diagnostic tools requiring stable component supply and long-term manufacturability.
Supply support for APX803L20-34SA-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q standards.
The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for ultra-low-power supervisory functions in battery-operated and energy-harvesting systems where reliability and minimal current draw are critical.
FAQ
What is the exact reset threshold voltage for APX803L20-34SA-7?
The APX803L20-34SA-7 has a factory-trimmed threshold voltage of 3.4V with ±1.5% accuracy over temperature (–40°C to +85°C). This value is fixed internally and cannot be adjusted externally. Measured hysteresis is 0.01×VTH (34mV), ensuring clean release above 3.434V.
Can APX803L20-34SA-7 monitor a 1.8V supply rail?
No - the APX803L20-34SA-7 is specified to monitor rails between 0.9V and 5.5V, but its 3.4V threshold is fixed and not scalable. To supervise a 1.8V rail, use APX803L18-XXSA-7 (1.8V variant) or a programmable supervisor like the APX811 series.
What is the maximum sink current capability of the RESET pin?
The RESET pin supports up to 20mA absolute maximum sink current, with a guaranteed VOL ≤ 0.4V at ISINK = 3.5mA and VCC = VTH − 0.2V. For standard 3.3V systems with 10kΩ pull-up, typical sink current is <0.33mA - well within safe operating limits.
Is APX803L20-34SA-7 qualified for automotive applications?
No - APX803L20-34SA-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803L20-34SA-7Q) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening. Contact Diodes sales for qualified part numbers.
APX803L20-34SA-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:
- 3.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 143ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L20-34SA-7 FAQ
1.How can I place an order for APX803L20-34SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-34SA-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 APX803L20-34SA-7 reliable?
The price and inventory of APX803L20-34SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-34SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-34SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-34SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-34SA-7?
APX803L20-34SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-34SA-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 APX803L20-34SA-7?
For technical support, including APX803L20-34SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-34SA-7 requirements.
6.How does Aetrix verify that APX803L20-34SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-34SA-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 APX803L20-34SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-34SA-7?
All APX803L20-34SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-34SA-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 APX803L20-34SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-34SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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