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Diodes Incorporated APX803L05-38SA-7
- Part No.:
- APX803L05-38SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L05-38SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,541
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Product details
Overview
APX803L05-38SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring VCC supply levels in embedded digital systems. It features a fixed 3.8V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 55ms reset timeout delay. Used in battery-powered instrumentation and portable electronics requiring reliable power-on reset.
For engineers reviewing the APX803L05-38SA-7 datasheet, APX803L05-38SA-7 pinout, APX803L05-38SA-7 application, or APX803L05-38SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay timing stability over temperature, low-quiescent-current operation in sleep modes, and SOT23 package compatibility with high-density PCB layouts.
Technical Context
The APX803L05-38SA-7 implements a precision bandgap-based voltage reference comparator with built-in hysteresis (0.01×VTH) to prevent oscillation during supply ramp-up/down. Its internal threshold is factory-trimmed to 3.8V and invariant across -40°C to +85°C operating ambient.
Reset assertion occurs within 20µs when VCC drops below 3.8V, and release requires VCC to exceed 3.815V (VTH_H = VTH_L × 1.004). The open-drain output supports wired-OR configuration and external pull-up to any logic rail up to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 3.8V ±1.5% - ensures reliable reset initiation at defined system brown-out level |
| Supply Current | 1.0µA typ. - enables multi-year battery life in always-on monitoring applications |
| Reset Delay | 55ms - provides stable post-power-up hold-off before processor release |
| Response Time | 20µs - guarantees fast fault detection during transient supply dips |
| Output Type | Open-drain, active-low - allows flexible interface with diverse logic families and shared reset buses |
| Operating Voltage | 0.9V to 5.5V - supports direct connection to 1.8V, 3.3V, and 5V supply rails |
| Temp Range | -40°C to +85°C - validated for industrial and portable equipment environments |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Return path for internal bias and comparator; must be low-impedance connection to system ground plane |
| 2 (RESET) | Open-Drain Output | Active-low reset signal; requires external pull-up resistor (typically 10kΩ) to host VCC or logic rail |
| 3 (VCC) | Supply Input | Powers internal circuitry; accepts 0.9–5.5V; decoupling capacitor (100nF) recommended adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1.0µA typical supply current minimizes standby power burden in energy-constrained designs |
| Fixed 3.8V Threshold | Factory-trimmed detection point eliminates external resistor network and calibration effort |
| 55ms Timeout Delay | Internally generated delay ensures sufficient power stabilization before releasing µP from reset |
| ±1.5% Accuracy | Guaranteed threshold tolerance over full temperature range reduces design margin uncertainty |
| No External Components | Self-contained operation requires only decoupling cap-no resistors, capacitors, or trimming needed |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG sensor continuously monitors battery voltage while in ultra-low-power sleep mode between measurements. IC Role / Device Role / Timing Role: Voltage detector asserts RESET to halt MCU execution until VBAT recovers above 3.8V after cold start or deep discharge. Use Value: 1µA quiescent current extends coin-cell lifetime beyond 3 years; 55ms delay prevents spurious wakeups during battery recovery transients. | Use Scenario: DIN-rail mounted I/O module powers up in harsh factory environments where input 24VDC supply may sag during motor startup. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output feeding FPGA configuration logic; holds system in reset until rail stabilizes. Use Value: ±1.5% threshold accuracy ensures deterministic reset behavior across -40°C to +85°C ambient; open-drain output interfaces directly with FPGA's active-low PROG_B pin. |
| Smart Home Hub Power Management | Automotive Body Control Module (Non-AEC) |
Use Scenario: Wi-Fi-enabled home automation hub uses dual-supply architecture (5V main, 3.3V logic); detects 3.3V rail integrity during AC adapter hot-plug events. IC Role / Device Role / Timing Role: Monitors 3.3V domain and triggers hardware reset if voltage collapses due to load switching or regulator fault. Use Value: 20µs response time captures fast transients missed by slower supervisors; SOT23-3 footprint saves space on compact 4-layer PCB. | Use Scenario: Aftermarket lighting controller powered from vehicle battery (9–16V) with internal 5V buck converter; requires robust reset under cranking conditions. IC Role / Device Role / Timing Role: Detects 5V rail collapse during engine start (battery dip to ~6.5V) and holds microcontroller in reset until recovery. Use Value: 3.8V threshold aligns with minimum 5V regulator dropout; hysteresis (≈38mV) prevents chatter during slow VCC recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803E38DBVR | 3.8V threshold, 2.7µA max ICC, 200ms default delay (non-adjustable) | Larger 5-pin SOT23 package; no 55ms option - only 200ms or 1.1s variants | Select if longer reset hold time is acceptable and board layout accommodates larger footprint |
| MAX809SEUR+T | 3.08V threshold (not 3.8V), 12µA max ICC, 240ms delay | Requires external RC for delay tuning; higher supply current impacts battery runtime | Choose only if system tolerates lower trip point and can accommodate higher quiescent draw |
Compared with TLV803E38DBVR and MAX809SEUR+T, the APX803L05-38SA-7 delivers tighter threshold accuracy (±1.5% vs ±2.5%), lower ICC (1µA vs ≥2.7µA), and exact 55ms delay without external components-making it optimal for space- and energy-constrained 3.3V/5V embedded systems.
Availability
APX803L05-38SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hubs, and automotive body control modules requiring stable component supply across extended production lifecycles.
Supply support for APX803L05-38SA-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 devices, with emphasis on power management, signal integrity, and protection solutions.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and industrial embedded systems.
FAQ
What is the exact reset threshold voltage and its tolerance for APX803L05-38SA-7?
The APX803L05-38SA-7 has a factory-set detection threshold of 3.8V with guaranteed accuracy of ±1.5% over -40°C to +85°C ambient temperature. This means the actual trip point falls between 3.743V and 3.857V under specified operating conditions, as confirmed in Electrical Characteristics Table of DS38171 Rev. 3-2.
Does APX803L05-38SA-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 (typically 4.7kΩ to 10kΩ) to the monitored supply rail or host logic voltage is mandatory for proper operation. Without it, the output cannot drive a valid HIGH state during reset release.
Can APX803L05-38SA-7 operate from a 1.8V supply rail?
No - the minimum operating supply voltage is 0.9V, but the 3.8V threshold requires VCC ≥ 3.8V to function as intended. For 1.8V systems, use a variant like APX803L18-XXSA-7 (1.8V threshold); the "05" suffix denotes 55ms delay, not supply voltage.
Is APX803L05-38SA-7 qualified for automotive AEC-Q100 applications?
No - this specific part is not AEC-Q100 qualified. Diodes states that automotive-grade versions require explicit change control, PPAP capability, and IATF 16949 manufacturing; APX803L05-38SA-7 is rated for industrial temperature range (-40°C to +85°C) only and carries no AEC qualification.
APX803L05-38SA-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:
- 3.8V
- 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
APX803L05-38SA-7 FAQ
1.How can I place an order for APX803L05-38SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L05-38SA-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 APX803L05-38SA-7 reliable?
The price and inventory of APX803L05-38SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L05-38SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L05-38SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L05-38SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L05-38SA-7?
APX803L05-38SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L05-38SA-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 APX803L05-38SA-7?
For technical support, including APX803L05-38SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L05-38SA-7 requirements.
6.How does Aetrix verify that APX803L05-38SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L05-38SA-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 APX803L05-38SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L05-38SA-7?
All APX803L05-38SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L05-38SA-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 APX803L05-38SA-7 part is unused and in its original packaging.
Return procedure for APX803L05-38SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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