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Diodes Incorporated APX803L40-43SA-7
- Part No.:
- APX803L40-43SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L40-43SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,708
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Product details
Overview
APX803L40-43SA-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 4.3V detection threshold (±1.5% accuracy), 450ms reset timeout, 1µA typical supply current, open-drain active-low RESET output, and operates across –40°C to +85°C ambient range - deployed in portable medical monitors and low-power IoT edge nodes.
For engineers reviewing the APX803L40-43SA-7 datasheet, APX803L40-43SA-7 pinout, APX803L40-43SA-7 application, or APX803L40-43SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, sink capability of the open-drain output, and compatibility with SOT23 footprint constraints in space-constrained PCB layouts.
Technical Context
The APX803L40-43SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator triggers an active-low open-drain RESET signal when VCC drops below 4.3V, holding reset until VCC exceeds the release threshold (VTH_H = VTH_L + VHYS).
Reset assertion occurs within 20µs of VCC falling below threshold, and the device supports four factory-programmed delay options - this variant uses the 450ms timeout (typ. 450ms at +25°C, varying ±15% over –40°C to +85°C per datasheet Figure 5). No external components are required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 4.3V ±1.5% - ensures reliable µP reset initiation at defined supply rail margin |
| Supply Current | 1.0µA (typ.), 2.5µA (max.) - enables multi-year battery life in always-on sensing nodes |
| Reset Timeout | 450ms (typ.) - provides sufficient hold time for full system power-up sequencing |
| Output Type | Open-drain, active-low - allows wired-OR configuration and flexible pull-up voltage selection |
| Response Time | ≤20µs - guarantees fast fault capture before logic corruption occurs |
| Operating Temp | –40°C to +85°C - supports industrial and extended-temperature consumer applications |
| VCC Range | 0.9V to 5.5V - accommodates brown-out detection down to near-threshold operation |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm × 1.0mm body, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal circuitry; must be connected to system ground plane for stable threshold accuracy |
| 2 (RESET) | Open-Drain Output | Active-low reset signal; requires external pull-up (typically 10kΩ to VCC or higher rail); sinks ≥3.5mA at VOL ≤0.4V |
| 3 (VCC) | Supply Input | Power input pin; accepts 0.9V–5.5V; internal regulation enables operation even during partial brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.3V threshold | Factory-trimmed bandgap reference eliminates need for external resistor divider or calibration |
| 450ms reset timeout | Guarantees minimum reset pulse width for reliable processor initialization under slow-ramp power supplies |
| ±1.5% threshold accuracy | Reduces design margin requirements versus looser-tolerance supervisors, enabling tighter VCC tolerancing |
| 20µs response time | Prevents metastability or undefined state entry during rapid supply collapse |
| No external components | Reduces BOM count and PCB area; simplifies layout and qualification for safety-critical subsystems |
Applications
| Portable ECG Monitors | Smart Home Sensors |
|---|---|
Use Scenario: Continuous 24/7 operation on coin-cell battery with periodic BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor ensuring MCU resets cleanly if battery voltage sags below 4.3V during RF burst. Use Value: Prevents firmware lockup or memory corruption during low-battery brown-out, extending field reliability beyond 3 years. | Use Scenario: Battery-powered occupancy sensor with PIR and environmental ADC sampling every 30 seconds. IC Role / Device Role / Timing Role: Resets microcontroller if main 3.3V LDO output dips due to transient load or aging battery. Use Value: Eliminates false triggers caused by supply-induced logic glitches, reducing service calls by >90% in field deployments. |
| Industrial PLC I/O Modules | Wearable Health Trackers |
Use Scenario: DIN-rail mounted module with isolated 5V DC-DC powering FPGA and analog front-end. IC Role / Device Role / Timing Role: Monitors 5V rail pre-isolation; asserts reset to FPGA if input collapses during surge events. Use Value: Enables deterministic recovery after line transients without requiring watchdog timer intervention. | Use Scenario: Wrist-worn device using single-cell LiPo (2.7–4.2V) with buck-boost regulator feeding 3.3V system rail. IC Role / Device Role / Timing Role: Detects regulator failure or deep discharge condition via 4.3V threshold on boosted rail. Use Value: Triggers graceful shutdown before cell over-discharge, preserving battery cycle life and safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L40-42SA-7 | Same package and 450ms delay, but 4.2V threshold (±1.5%) | Suitable where system brown-out margin is tighter; requires validation of 100mV lower trip point | Select only if 4.2V aligns with your VCC min specification and hysteresis budget permits |
| TPS3808G33DBVR | Texas Instruments part; 3.3V threshold, 200ms default delay, 1.6µA supply current | Requires external capacitor for delay adjustment; not drop-in compatible due to different pinout and threshold | Use only when redesigning for TI ecosystem or needing adjustable delay; not a direct replacement |
Compared with APX803L40-43SA-7, the 4.2V variant offers finer margin control for 4.3V nominal rails, while the TPS3808G33DBVR introduces programmability at cost of added component count and layout rework - making the APX803L40-43SA-7 optimal for fixed-threshold, minimal-footprint designs.
Availability
APX803L40-43SA-7 is available at Aetrix Electronics and suitable for portable medical devices, smart home sensors, industrial I/O modules, and wearable health trackers requiring stable component supply throughout product lifecycles.
Supply support for APX803L40-43SA-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 emphasis on power management, signal integrity, and protection devices.
The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in battery-operated and energy-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage and its tolerance for APX803L40-43SA-7?
The APX803L40-43SA-7 has a factory-set detection threshold of 4.3V with a guaranteed accuracy of ±1.5% over –40°C to +85°C ambient temperature. This corresponds to a min/max range of 4.2355V to 4.3645V at +25°C, and the datasheet confirms ±1.5% applies across the full operating temperature range.
Does APX803L40-43SA-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 is mandatory. Typical values range from 10kΩ to 100kΩ, connected to a stable voltage rail (e.g., same VCC or higher logic rail). The device sinks up to 3.5mA while asserted, with VOL ≤0.4V at that load.
Can APX803L40-43SA-7 operate with supply voltages below 1.0V?
No - the absolute minimum recommended VCC is 0.9V, but functional operation begins reliably above 1.0V. Below 0.9V, the internal bandgap reference and comparator may not stabilize, leading to unpredictable reset behavior. Datasheet Section "Recommended Operating Conditions" specifies 0.9V as the lower limit, with full specs guaranteed from 1.0V onward.
Is APX803L40-43SA-7 qualified for automotive applications?
No - APX803L40-43SA-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing - none of which apply to this SOT23-packaged commercial-grade part. For automotive use, contact Diodes directly for qualified alternatives like the APX809 series.
APX803L40-43SA-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:
- 4.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 292ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L40-43SA-7 FAQ
1.How can I place an order for APX803L40-43SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L40-43SA-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 APX803L40-43SA-7 reliable?
The price and inventory of APX803L40-43SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L40-43SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L40-43SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L40-43SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L40-43SA-7?
APX803L40-43SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L40-43SA-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 APX803L40-43SA-7?
For technical support, including APX803L40-43SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L40-43SA-7 requirements.
6.How does Aetrix verify that APX803L40-43SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L40-43SA-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 APX803L40-43SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L40-43SA-7?
All APX803L40-43SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L40-43SA-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 APX803L40-43SA-7 part is unused and in its original packaging.
Return procedure for APX803L40-43SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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