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Diodes Incorporated APX803L05-42SA-7
- Part No.:
- APX803L05-42SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L05-42SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
APX803L05-42SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 4.2 V reset threshold with ±1.5% accuracy, 1 µA typical supply current, open-drain active-low RESET output, and 55 ms reset timeout. It monitors VCC in battery-powered embedded systems and ensures reliable power-on reset for microcontrollers.
For engineers reviewing the APX803L05-42SA-7 datasheet, APX803L05-42SA-7 pinout, APX803L05-42SA-7 application, or APX803L05-42SA-7 equivalent, this page delivers verified electrical parameters, SOT23 package mapping, functional pin roles, real-world use cases in portable equipment, and validated alternative parts with documented timing and threshold differences.
Technical Context
The APX803L05-42SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its internal comparator triggers an open-drain output when VCC drops below 4.2 V, holding RESET low until VCC exceeds 4.2 V + hysteresis.
It integrates a fixed 55 ms recovery delay (tDELAY), operates from 0.9 V to 5.5 V supply, and achieves 20 µs response time from VCC drop to RESET assertion. No external components are required - the device functions as a self-contained reset supervisor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.2 V ±1.5% - precisely holds µP in reset until main supply stabilizes above nominal 4.2 V rail |
| Supply Current | 1 µA (typ.) - enables multi-year operation in coin-cell–powered IoT sensors without measurable battery drain |
| Reset Timeout | 55 ms - guarantees sufficient hold time for slow-ramping power supplies before µP release |
| Response Time | 20 µs - ensures immediate fault detection during brownout events critical for data integrity |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and flexible pull-up voltage selection |
| Operating Voltage | 0.9 V to 5.5 V - supports supervision of 1.2 V, 1.8 V, 3.3 V, and 5 V logic domains |
| Hysteresis | 0.01 × VTH (≈42 mV) - prevents chatter during noisy or slowly recovering supply transitions |
Pinout & Package
SOT23-3 package (JEDEC TO-236), 1.3 mm × 2.9 mm × 1.0 mm body, surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal circuitry; must be connected to system ground plane for accurate threshold sensing |
| 2 (VCC) | Supply input | Monitored power rail input; powers internal reference and comparator; valid from 0.9 V to 5.5 V |
| 3 (RESET) | Open-drain reset output | Active-low signal asserted when VCC < 4.2 V; requires external pull-up to define logic-high level and drive strength |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1 µA typical - eliminates need for power-gating circuitry in always-on monitoring applications |
| Factory-trimmed threshold | 4.2 V ±1.5% - eliminates external resistor divider calibration and reduces BOM count |
| Fixed 55 ms delay | Guaranteed tDELAY = 35–75 ms over -40°C to +85°C - ensures deterministic reset timing across temperature |
| No external components | Self-contained supervision - no capacitors, resistors, or additional ICs required for basic reset functionality |
| Wide supply range | 0.9 V to 5.5 V operation - supports direct connection to Li-ion, NiMH, and regulated DC rails without level-shifting |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless environmental sensor powered by a CR2032 coin cell must retain state across intermittent wake cycles and survive brownouts during RF transmission. IC Role / Device Role / Timing Role: Voltage detector asserts RESET during VCC sag below 4.2 V, preventing corrupted EEPROM writes and MCU lockup. Use Value: 1 µA supply current extends battery life beyond 5 years; 55 ms timeout accommodates transient dips caused by BLE burst transmission. |
Use Scenario: An industrial digital input module receives 24 V DC from field wiring, regulated down to 3.3 V for its microcontroller and FPGA. IC Role / Device Role / Timing Role: Monitors the 3.3 V rail and forces controlled reboot if supply collapses due to cable fault or ESD event. Use Value: ±1.5% threshold accuracy ensures reset occurs only at true undervoltage-not premature triggering near nominal 3.3 V. |
| Medical Wearable Monitor | Automotive Body Control Module (BCM) Subsystem |
Use Scenario: A wrist-worn ECG monitor uses a rechargeable LiPo battery whose voltage decays from 4.2 V to 3.0 V during discharge. IC Role / Device Role / Timing Role: Detects end-of-life battery condition at 4.2 V threshold and initiates graceful shutdown before data loss. Use Value: Hysteresis (42 mV) prevents repeated reset toggling during gradual battery decay, ensuring stable firmware execution. |
Use Scenario: A BCM sub-board powers auxiliary lighting drivers from a 5 V LDO fed by vehicle battery (9–16 V). IC Role / Device Role / Timing Role: Supervises the 5 V rail to detect load dump transients or alternator failure-induced undervoltage. Use Value: 20 µs response time captures fast transients missed by slower supervisors, improving system robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L20-42SA-7 | Same 4.2 V threshold, but 220 ms reset timeout (vs. 55 ms) | Used where longer reset hold is needed for complex power sequencing (e.g., FPGA configuration) | Select when system requires extended reset assertion beyond 55 ms - not drop-in compatible due to timing mismatch |
| TLV803EA42DBZR | 4.2 V threshold, ±1.0% accuracy, 2.5 µA max ICC, 200 ms timeout | Higher accuracy and tighter tempco, but longer default delay and higher supply current | Choose for high-reliability applications needing better than ±1.5% tolerance; verify timing compatibility with host µP reset spec |
Compared with APX803L20-42SA-7 and TLV803EA42DBZR, the APX803L05-42SA-7 offers the shortest guaranteed reset timeout (55 ms) and lowest typical supply current (1 µA), making it optimal for fast-recovery, ultra-low-power systems where timing predictability and battery longevity are primary constraints.
Availability
APX803L05-42SA-7 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, medical wearables, and industrial PLC modules requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for APX803L05-42SA-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 design centers across Asia, Europe, and the US, serving industrial, computing, communications, and consumer markets.
The APX803L series belongs to Diodes' precision power-supervision product line, engineered specifically for ultra-low-power, high-accuracy reset generation in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage and tolerance for APX803L05-42SA-7?
The APX803L05-42SA-7 has a factory-trimmed reset threshold of 4.2 V with a guaranteed accuracy of ±1.5% over -40°C to +85°C ambient temperature, corresponding to a min/max range of 4.137 V to 4.263 V at 25°C per DS38171 Rev. 3–2.
Does APX803L05-42SA-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 a logic-compatible voltage (e.g., 3.3 V or 5 V) is mandatory to establish a defined high state when not asserted; typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements.
Can APX803L05-42SA-7 operate from a 1.2 V supply?
No - the minimum operating supply voltage is 0.9 V, but the 4.2 V threshold requires VCC ≥ 4.2 V to release RESET; therefore, it cannot supervise rails below 4.2 V. For 1.2 V supervision, select APX803L-12SA-7 (1.2 V variant) instead.
Is APX803L05-42SA-7 qualified for automotive applications?
No - while Diodes offers AEC-Q100–qualified variants in the APX803L family (e.g., marked "-Q" suffix), the APX803L05-42SA-7 is rated for industrial temperature range (-40°C to +85°C) and is not certified to AEC-Q100; automotive designs require explicit qualification confirmation from Diodes' automotive team.
APX803L05-42SA-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:
- 4.2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L05-42SA-7 FAQ
1.How can I place an order for APX803L05-42SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L05-42SA-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 APX803L05-42SA-7 reliable?
The price and inventory of APX803L05-42SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L05-42SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L05-42SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L05-42SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L05-42SA-7?
APX803L05-42SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L05-42SA-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 APX803L05-42SA-7?
For technical support, including APX803L05-42SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L05-42SA-7 requirements.
6.How does Aetrix verify that APX803L05-42SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L05-42SA-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 APX803L05-42SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L05-42SA-7?
All APX803L05-42SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L05-42SA-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 APX803L05-42SA-7 part is unused and in its original packaging.
Return procedure for APX803L05-42SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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