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Diodes Incorporated APX803L-19SA-7
- Part No.:
- APX803L-19SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L-19SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
APX803L-19SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in battery-powered and embedded digital systems. It features a fixed 1.9V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 220ms reset timeout - enabling reliable power-up sequencing in portable instrumentation and low-power IoT nodes.
For engineers reviewing the APX803L-19SA-7 datasheet, APX803L-19SA-7 pinout, APX803L-19SA-7 application, or APX803L-19SA-7 equivalent, this device delivers precise undervoltage detection with minimal system power overhead, fast 20µs reset assertion, and SOT23-3 package compatibility for space-constrained PCB layouts.
Technical Context
The APX803L-19SA-7 integrates a precision bandgap reference and comparator to monitor VCC against a factory-trimmed 1.9V threshold. Its internal hysteresis (0.01×VTH) prevents oscillation during slow-rising or noisy supply transitions.
Reset assertion occurs within 20µs when VCC drops below 1.9V; recovery requires VCC to exceed 1.9V + hysteresis before RESET deasserts. The 220ms delay variant (indicated by "20" in ordering code) ensures stable post-reset hold time for microcontroller initialization sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 1.9V ±1.5% - precisely triggers reset at nominal 1.9V supply level, supporting 2.0V–2.2V logic domain supervision |
| Supply Current | 1.0µA typical - imposes negligible load on coin-cell or energy-harvesting power rails |
| Reset Timeout | 220ms - holds RESET low long enough for full µP boot and peripheral initialization |
| Reset Response Time | 20µs - guarantees rapid fault capture during brownout events |
| Output Type | Open-drain, active-low - enables wired-OR reset bus sharing and flexible pull-up voltage selection |
| Operating Voltage Range | 0.9V to 5.5V - supports supervision of 1.2V, 1.8V, 2.5V, 3.3V, and 5.0V rails |
| Temperature Range | −40°C to +85°C - validated for industrial ambient operation without derating |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, gull-wing leads. RoHS-compliant, halogen-free, lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal circuitry and RESET sink current; must connect to system ground plane |
| 2 (RESET) | Open-Drain Output | Active-low reset signal; requires external pull-up resistor to host VCC or compatible logic rail |
| 3 (VCC) | Supply Input | Monitored power rail input; powers internal circuitry and defines detection reference point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typ. - extends battery life in always-on monitoring applications beyond 10 years on CR2032 |
| Factory-trimmed threshold | 1.9V ±1.5% - eliminates need for external resistor dividers or calibration in production |
| Programmable reset timeout | 220ms variant - matches typical ARM Cortex-M boot sequence timing without software intervention |
| No external components required | Self-contained detection and timing - reduces BOM count and layout area vs. discrete RC solutions |
| Robust ESD protection | ±4000V HBM - withstands handling and board-level assembly without additional protection circuitry |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by single alkaline AA cell with 1.5V nominal output. IC Role / Device Role / Timing Role: Monitors declining battery voltage and asserts RESET before ADC or BLE radio fails due to insufficient supply headroom. Use Value: Prevents corrupted sensor data transmission by ensuring clean µC reset at 1.9V, aligning with battery end-of-life cutoff. |
Use Scenario: DIN-rail mounted remote I/O node operating in factory environments with fluctuating 24VDC supply. IC Role / Device Role / Timing Role: Supervises local 3.3V LDO output feeding FPGA configuration logic and serial interface transceivers. Use Value: 220ms reset hold guarantees FPGA reconfiguration completes before communication firmware starts, eliminating bus lockups. |
| Smart Home Hub Controllers | Asset Tracking Beacons |
Use Scenario: Wi-Fi-enabled home automation hub using 5V USB power with transient dips during RF transmit bursts. IC Role / Device Role / Timing Role: Detects momentary 5V rail sag below 1.9V-equivalent threshold derived from internal reference, independent of input voltage scaling. Use Value: Avoids spurious resets during normal RF operation while catching true brownouts that compromise memory integrity. |
Use Scenario: GPS/Bluetooth LE beacon powered by 3.6V Li-SOCl₂ primary cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation when cell voltage decays to 1.9V after decades of ultra-low-quiescent standby. Use Value: Enables deterministic last-gasp telemetry upload before permanent shutdown, meeting ISO 26262 functional safety reporting needs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EA19DPWR | 1.9V threshold, 0.8µA supply current, but only 0ms/200ms delay options - no 220ms variant | Requires external RC network to achieve exact 220ms hold time, increasing component count and tolerance sensitivity | Select if lowest possible current dominates and 200ms is acceptable; avoid if strict 220ms timing is required per design spec |
| MAX809SEUR+T | 1.9V threshold, 1.2µA supply current, fixed 240ms reset timeout - 20ms longer than APX803L-19SA-7 | Marginally longer hold time may delay system startup in tight-timing µP boot paths | Acceptable where 240ms meets timing budget; verify µP reset sampling window accommodates extra 20ms |
Compared with TLV803EA19DPWR and MAX809SEUR+T, the APX803L-19SA-7 uniquely delivers factory-programmed 220ms timing with no external components, tighter threshold accuracy (±1.5% vs. ±2.0%), and identical SOT23-3 footprint - simplifying qualification and reducing layout risk.
Availability
APX803L-19SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for APX803L-19SA-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 APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-critical and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for APX803L-19SA-7?
The APX803L-19SA-7 has a factory-trimmed detection threshold of 1.9V with ±1.5% accuracy over temperature (−40°C to +85°C). This value is fixed internally and does not require external resistors or calibration. Measured threshold variation remains within 1.8715V to 1.9285V under specified conditions.
Does APX803L-19SA-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain and active-low, so an external pull-up resistor to the target logic rail (e.g., 3.3V or 5V) is mandatory. Typical values range from 10kΩ to 100kΩ; lower values improve noise immunity but increase static current draw during reset assertion.
Can APX803L-19SA-7 monitor a 1.2V supply rail?
No - the APX803L-19SA-7 is configured for 1.9V detection and operates down to 0.9V supply, but it cannot supervise rails below its threshold. For 1.2V supervision, use APX803L-12SA-7 (1.2V variant) or APX803L-13SA-7 (1.3V variant), both available in the same SOT23-3 package.
Is APX803L-19SA-7 qualified for automotive applications?
No - APX803L-19SA-7 is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade alternatives (e.g., APX803L-19SA-7Q) with PPAP support, IATF 16949 manufacturing, and extended temperature validation; contact Diodes sales for qualified part numbers.
APX803L-19SA-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:
- 1.9V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L-19SA-7 FAQ
1.How can I place an order for APX803L-19SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L-19SA-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 APX803L-19SA-7 reliable?
The price and inventory of APX803L-19SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L-19SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L-19SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-19SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L-19SA-7?
APX803L-19SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L-19SA-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 APX803L-19SA-7?
For technical support, including APX803L-19SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-19SA-7 requirements.
6.How does Aetrix verify that APX803L-19SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L-19SA-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 APX803L-19SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L-19SA-7?
All APX803L-19SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-19SA-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 APX803L-19SA-7 part is unused and in its original packaging.
Return procedure for APX803L-19SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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