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Diodes Incorporated APX803L05-39SA-7
- Part No.:
- APX803L05-39SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L05-39SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,224
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Product details
Overview
APX803L05-39SA-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 3.9V detection threshold (±1.5% accuracy), 1µA typical supply current, open-drain active-low RESET output, and 450ms reset timeout delay. Used in battery-powered instrumentation and portable electronics requiring reliable power-on reset signaling.
For engineers reviewing the APX803L05-39SA-7 datasheet, APX803L05-39SA-7 pinout, APX803L05-39SA-7 application, or APX803L05-39SA-7 equivalent, key selection criteria include detection voltage tolerance, reset delay timing stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.
Technical Context
The APX803L05-39SA-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 3.9V with ±1.5% initial accuracy and 50ppm/°C temperature coefficient.
It delivers fast reset assertion within 20µs of VCC falling below threshold and sustains the active-low RESET signal until VCC exceeds VTH + hysteresis. The 450ms delay option (denoted by "40" in part number) is implemented via on-chip RC timing, stable across -40°C to +85°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 3.9V ±1.5% - precise brown-out detection point for 4.0V nominal rails |
| Supply Current | 1.0µA typical - enables multi-year operation in coin-cell–powered devices |
| Reset Delay | 450ms - ensures full system stabilization before processor release |
| Output Type | Open-drain, active-low - supports wired-OR reset buses and flexible pull-up voltage selection |
| Response Time | 20µs - guarantees timely reset assertion during rapid supply collapse |
| Operating Temp | -40°C to +85°C - validated for industrial and extended commercial environments |
| Threshold Hysteresis | 0.01×VTH (39mV) - prevents chatter near trip point during noisy or slow-ramping supplies |
Pinout & Package
SOT23-3 package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, lead-free, halogen-free. Thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal comparator and output stage |
| 2 | RESET | Open-drain output; sinks up to 3.5mA at ≤0.4V when asserted |
| 3 | VCC | Power input (0.9–5.5V); powers internal circuitry and defines detection domain |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typ. - minimizes battery drain in always-on monitoring applications |
| Factory-trimmed threshold | 3.9V ±1.5% - eliminates external resistor network and calibration effort |
| Programmable reset timeout | 450ms option - matches boot-time requirements of ARM Cortex-M and RISC-V SoCs |
| No external components | Self-contained detection and timing - reduces BOM count and layout area |
| Robust ESD protection | ±4000V HBM - enhances manufacturability and field reliability in handling-sensitive environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until regulated 3.3V rail stabilizes post-battery insertion or cold start. Use Value: Prevents firmware execution under undervoltage, eliminating corrupted sensor readings and false alarms. | Use Scenario: DIN-rail mounted analog input module operating from 24VDC supply with local 3.3V LDO. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail; holds microcontroller in reset during line transients or brownouts. Use Value: Ensures deterministic startup and avoids spurious I/O state changes during power recovery. |
| Smart Home Hub Controllers | Asset Tracking Beacons |
Use Scenario: Wi-Fi-enabled home automation hub using dual-supply architecture (5V USB + 3.3V PMIC). IC Role / Device Role / Timing Role: Supervises 3.3V core rail; provides 450ms reset hold-off to allow PMIC sequencing and clock stabilization. Use Value: Eliminates boot failures caused by race conditions between power rails and clock domains. | Use Scenario: GPS/GSM asset tracker powered by Li-SOCl₂ primary cell with ultra-low sleep current. IC Role / Device Role / Timing Role: Detects 3.9V cutoff to trigger graceful shutdown before battery depletion. Use Value: Preserves last-known location data and prevents deep discharge damage to primary cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G39DBVR | Fixed 3.9V threshold, 350ms delay, 1.8µA supply current, SOT23-6 package | Requires external pull-up; no 450ms option; higher ICC limits battery life in ultra-low-power designs | Prefer when design already uses TI ecosystem or requires adjustable delay via capacitor |
| MAX809SEUR+T | 3.08V threshold (not 3.9V), 140ms delay, 10µA supply current, SOT23-3 package | Lower detection voltage incompatible with 3.3V systems needing margin above rail; 10× higher ICC | Only suitable if system operates at ≤3.1V and 450ms delay is not required |
Compared with TPS3808G39DBVR and MAX809SEUR+T, APX803L05-39SA-7 offers the exact 3.9V threshold, lowest ICC (1µA), and matching 450ms delay in identical SOT23-3 footprint-enabling direct replacement without layout or firmware changes in space- and power-constrained designs.
Availability
APX803L05-39SA-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 long-lifecycle deployments.
Supply support for APX803L05-39SA-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' µP supervisory product line, engineered specifically for low-power, high-accuracy reset generation in battery-operated and energy-conscious embedded systems.
FAQ
What is the exact reset threshold voltage and its tolerance for APX803L05-39SA-7?
The APX803L05-39SA-7 has a factory-trimmed detection threshold of 3.9V with ±1.5% initial accuracy at +25°C, and a temperature coefficient of 50ppm/°C over –40°C to +85°C. This yields a worst-case threshold range of 3.84V to 3.96V at room temperature, tightening system-level power-rail margin control.
Does APX803L05-39SA-7 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is open-drain and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3V or 5V). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. No other external components are needed for basic operation.
Can APX803L05-39SA-7 operate from a 2.5V supply?
No - the minimum recommended VCC is 0.9V, but the 3.9V detection threshold requires the monitored supply to be ≥3.9V. Operating the device from 2.5V is electrically possible (within 0.9–5.5V range), but it cannot supervise a 2.5V rail; it must supervise a rail ≥3.9V, such as a 4.0V or 5.0V domain.
Is APX803L05-39SA-7 qualified for automotive applications?
No - APX803L05-39SA-7 is specified for industrial and commercial temperature ranges (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the APX803L20-29SR variant (2.9V threshold) in AEC-Q100 Grade 2, but no 3.9V automotive-grade version is listed in current documentation.
APX803L05-39SA-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:
- 3.9V
- 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
APX803L05-39SA-7 FAQ
1.How can I place an order for APX803L05-39SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L05-39SA-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 APX803L05-39SA-7 reliable?
The price and inventory of APX803L05-39SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L05-39SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L05-39SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L05-39SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L05-39SA-7?
APX803L05-39SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L05-39SA-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 APX803L05-39SA-7?
For technical support, including APX803L05-39SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L05-39SA-7 requirements.
6.How does Aetrix verify that APX803L05-39SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L05-39SA-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 APX803L05-39SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L05-39SA-7?
All APX803L05-39SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L05-39SA-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 APX803L05-39SA-7 part is unused and in its original packaging.
Return procedure for APX803L05-39SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX803L05-39SA-7 Tags
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MIC826SYMT-TR
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