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Diodes Incorporated APX803L05-37SA-7
- Part No.:
- APX803L05-37SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L05-37SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,827
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Product details
Overview
APX803L05-37SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.7V threshold detection with ±1.5% accuracy, 1µA typical supply current, open-drain active-low reset output, and 55ms reset timeout delay. It monitors VCC in battery-powered embedded systems and portable electronics to ensure reliable power-on reset and brownout recovery.
For engineers reviewing the APX803L05-37SA-7 datasheet, APX803L05-37SA-7 pinout, APX803L05-37SA-7 application, or APX803L05-37SA-7 equivalent, this device supports critical low-power system supervision where tight threshold tolerance, ultra-low quiescent current, and fixed-delay reset timing are required for microcontroller stability.
Technical Context
The APX803L05-37SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×VTH) to prevent oscillation during threshold crossing. Its comparator drives an open-drain NMOS output stage capable of sinking up to 20mA with VOL ≤ 0.4V at 3.5mA sink current.
Reset assertion occurs when VCC falls below 3.7V (±1.5%), and release requires VCC to exceed 3.7V + hysteresis; the built-in 55ms timeout ensures sufficient hold time for processor initialization before release. Temperature coefficient is 50ppm/°C over –40°C to +85°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.7V ±1.5% - precisely triggers reset when supply drops below nominal 3.7V rail, enabling stable µP boot sequencing |
| Supply Current | 1.0µA typical - imposes negligible load on battery or low-power rails, extending operational life in portable devices |
| Reset Timeout | 55ms - guarantees minimum reset pulse width for full microcontroller initialization and register clearing |
| Output Type | Open-drain, active-low - allows wired-OR configuration and flexible pull-up voltage selection (up to 5.5V) |
| Response Time | 20µs - ensures rapid detection of fast VCC transients, preventing premature release during supply glitches |
| Operating Range | VCC = 0.9V to 5.5V - supports supervision of 1.8V, 3.3V, and 5V logic domains with margin |
| Hysteresis | 0.01×VTH (≈37mV) - prevents chatter near threshold during slow-rising/falling supply conditions |
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 circuitry and reset output; must be connected directly to system ground plane |
| 2 (RESET) | Open-Drain Reset Output | Active-low signal asserted when VCC < 3.7V; requires external pull-up to host VCC or higher rail (≤5.5V) |
| 3 (VCC) | Supply Input | Monitored power rail input; powers internal reference and comparator; operates down to 0.9V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 1.0µA typical enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Fixed 3.7V threshold | Factory-trimmed ±1.5% accuracy eliminates need for external resistor networks or calibration |
| 55ms reset timeout | Guarantees sufficient reset hold time for ARM Cortex-M and RISC-V MCU boot ROM execution |
| No external components | Self-contained supervision-no capacitors, resistors, or additional ICs required for basic reset generation |
| Wide temperature range | Specified from –40°C to +85°C ambient, supporting industrial and automotive cabin applications |
Applications
| Smartphone Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors main 3.7V Li-ion battery rail during cold start and deep discharge recovery. IC Role / Device Role / Timing Role: Voltage detector generating active-low reset pulse to hold application processor in reset until stable 3.7V is confirmed. Use Value: Prevents corrupted firmware execution by ensuring ≥55ms reset assertion during battery voltage ramp-up. |
Use Scenario: Supervises 3.3V FPGA configuration supply in programmable logic controllers exposed to wide ambient swings. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation when 3.3V rail dips below 3.7V due to transient load surges or EMI coupling. Use Value: Eliminates need for discrete RC reset circuits while maintaining ±1.5% threshold accuracy across –40°C to +85°C. |
| Wireless Sensor Node | Medical Wearable Monitor |
Use Scenario: Watches 3.0V regulated supply powering BLE SoC and analog front-end in battery-operated environmental sensor. IC Role / Device Role / Timing Role: Low-current supervisor asserting reset if supply sags below 3.7V during RF transmission bursts. Use Value: 1µA quiescent current extends shelf life and runtime; 20µs response captures fast supply droops missed by RC-based solutions. |
Use Scenario: Ensures safe boot of ultra-low-power ECG ASIC powered from 3.7V lithium-polymer cell. IC Role / Device Role / Timing Role: Generates clean, glitch-free reset signal synchronized to battery voltage recovery after insertion or charging interruption. Use Value: Built-in hysteresis (37mV) prevents repeated reset toggling during marginal battery conditions near end-of-life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EA37DBZR | 3.7V threshold, ±2.5% accuracy, 0.5µA supply current, 200ms default delay (adjustable via capacitor) | Requires external timing capacitor; lower accuracy but lower IQ; SOT-23-3 pin-compatible | Select when longer reset timeout or lowest possible IQ is prioritized over factory-set timing precision |
| MAX809SEUR+T | 3.08V threshold, ±2.5% accuracy, 12µA supply current, 240ms fixed delay, push-pull output | Higher IQ, different threshold, push-pull (not open-drain), incompatible reset timing and voltage level | Choose only if system requires push-pull output and can accommodate 3.08V trip point and higher current draw |
Compared with TLV803EA37DBZR and MAX809SEUR+T, the APX803L05-37SA-7 delivers tighter threshold accuracy (±1.5% vs. ±2.5%), lower supply current than MAX809, and factory-fixed 55ms timing-making it optimal for space-constrained, battery-sensitive designs requiring guaranteed reset duration without external components.
Availability
APX803L05-37SA-7 is available at Aetrix Electronics and suitable for smartphone power sequencing, industrial PLC I/O modules, wireless sensor nodes, and medical wearable monitors requiring stable component supply with guaranteed long-term availability.
Supply support for APX803L05-37SA-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 ICs for power management, signal integrity, and protection applications.
The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-operated and energy-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage for APX803L05-37SA-7?
The APX803L05-37SA-7 has a factory-trimmed reset threshold of 3.7V with a tolerance of ±1.5% over temperature (–40°C to +85°C), meaning the actual trip point falls between 3.645V and 3.755V at 25°C, and maintains this accuracy across its full operating range.
Can APX803L05-37SA-7 drive a 10kΩ pull-up resistor to 5V?
Yes-the open-drain RESET pin can sink up to 20mA with VOL ≤ 0.4V at 3.5mA, so driving a 10kΩ pull-up to 5V (resulting in ~0.5mA load) is well within specification and ensures robust logic-low assertion under all operating conditions.
Is there a version with adjustable reset delay?
No-APX803L05-37SA-7 has a fixed 55ms reset timeout. The APX803L family offers only four factory-set delays (0ms, 55ms, 220ms, 450ms); no variants support externally adjustable timing. For programmable delay, consider Diodes' APX811 series with capacitor-based timing.
Does APX803L05-37SA-7 meet AEC-Q200 for automotive use?
No-APX803L05-37SA-7 is not AEC-Q200 qualified. Diodes offers automotive-grade alternatives (e.g., APX803L05-37SA-7Q) with PPAP support, IATF 16949 manufacturing, and extended temperature screening; contact Diodes or Aetrix for qualified part numbers.
APX803L05-37SA-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:
- 3.7V
- 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
APX803L05-37SA-7 FAQ
1.How can I place an order for APX803L05-37SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L05-37SA-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 APX803L05-37SA-7 reliable?
The price and inventory of APX803L05-37SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L05-37SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L05-37SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L05-37SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L05-37SA-7?
APX803L05-37SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L05-37SA-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 APX803L05-37SA-7?
For technical support, including APX803L05-37SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L05-37SA-7 requirements.
6.How does Aetrix verify that APX803L05-37SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L05-37SA-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 APX803L05-37SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L05-37SA-7?
All APX803L05-37SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L05-37SA-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 APX803L05-37SA-7 part is unused and in its original packaging.
Return procedure for APX803L05-37SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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