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Diodes Incorporated APX803L20-37SA-7
- Part No.:
- APX803L20-37SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
APX803L20-37SA-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,495
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Product details
Overview
APX803L20-37SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 2.2 V threshold detection (±1.5% accuracy), 220 ms reset timeout, open-drain active-low RESET output, and ultra-low 1 µA typical supply current. It monitors VCC in battery-powered embedded systems such as portable medical devices and IoT edge sensors where power efficiency and reliable power-on reset are critical.
For engineers reviewing the APX803L20-37SA-7 datasheet, APX803L20-37SA-7 pinout, APX803L20-37SA-7 application, or APX803L20-37SA-7 equivalent, this page delivers verified technical context, SOT23 package mapping, timing-critical reset behavior, and real-world supervisory use cases - all derived from Diodes' official DS38171 Rev. 3–2 datasheet.
Technical Context
The APX803L20-37SA-7 implements a fixed-threshold voltage monitor with hysteresis (0.01×VTH) and internal bandgap reference, enabling stable reset assertion during brown-out conditions. Its open-drain output supports flexible pull-up configuration and direct interfacing with µP reset inputs across diverse logic families.
It operates over –40°C to +85°C ambient temperature, with supply voltage range 0.9 V to 5.5 V and guaranteed reset pulse width of 143–297 ms (typ. 220 ms) across temperature. The device requires no external components and achieves <20 µs response time from VCC drop to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.2 V ±1.5% - precisely matches common 2.2 V I/O rail monitoring requirements without trimming. |
| Supply Current | 1.0 µA (typ.), 2.5 µA (max.) - enables multi-year operation on coin-cell batteries in always-on sensing nodes. |
| Reset Timeout | 220 ms (typ.), 143–297 ms (min–max) - ensures sufficient hold time for full µP initialization before release. |
| Output Type | Open-drain, active-low - allows wired-OR reset bus configuration and compatibility with 1.8 V/3.3 V/5 V µP inputs. |
| Response Time | ≤20 µs - guarantees rapid fault detection during fast VCC transients, preventing µP lockup. |
| Operating Temp | –40°C to +85°C - validated for industrial-grade embedded control and portable consumer equipment. |
| Hysteresis | 0.01×VTH (≈22 mV) - prevents oscillatory reset toggling near threshold during noisy or slowly recovering supplies. |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), 2.9 mm × 1.3 mm × 1.0 mm 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 and reset output sink current; must be low-impedance connection to system ground plane. |
| 2 (RESET) | Open-Drain Reset Output | Active-low signal asserted when VCC < 2.2 V; requires external pull-up resistor (typically 10–100 kΩ) to host supply rail. |
| 3 (VCC) | Supply Input | Monitored power rail input; powers internal reference and comparator; valid from 0.9 V to 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.2 V threshold | Eliminates need for external resistive divider, reducing BOM count and layout area in space-constrained designs. |
| 220 ms factory-programmed delay | Guarantees µP core and peripherals fully stabilize before reset deassertion-no external RC timing network required. |
| ±1.5% threshold accuracy | Meets tight margin requirements for 2.2 V LDO outputs and low-voltage logic rails without calibration overhead. |
| 1 µA typical supply current | Reduces quiescent load on backup batteries or energy-harvesting sources by >90% versus legacy reset ICs. |
| –40°C to +85°C operation | Validated for deployment in uncontrolled environments including automotive cabin modules and outdoor sensor enclosures. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch continuously monitors heart rhythm using ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Voltage detector asserts RESET until main 2.2 V LDO stabilizes post-battery insertion or cold start. Use Value: Prevents firmware execution before ADC reference and op-amp biasing settle, eliminating false arrhythmia alerts. |
Use Scenario: DIN-rail mounted PLC module powers digital input cards from shared 24 V DC supply with local 2.2 V regulation. IC Role / Device Role / Timing Role: Supervises local 2.2 V rail feeding FPGA configuration memory and communication PHY. Use Value: Ensures deterministic FPGA reconfiguration and UART initialization after power interruption or brownout. |
| Smart Home Motion Detectors | Asset Tracking Beacons |
Use Scenario: PIR-based occupancy sensor wakes MCU only on motion, relying on coin-cell battery for multi-year life. IC Role / Device Role / Timing Role: Monitors 2.2 V buck-boost output powering MCU and radio; holds RESET during battery voltage sag under RF transmit burst. Use Value: Avoids MCU crash or corrupted BLE advertising packet transmission during transient load-induced dips. |
Use Scenario: GPS-enabled logistics tag reports location every 6 hours using intermittent GNSS acquisition and LoRaWAN uplink. IC Role / Device Role / Timing Role: Detects 2.2 V rail from energy-harvesting PMIC; asserts RESET if supercap voltage drops below safe operating level. Use Value: Guarantees clean shutdown and nonvolatile state save before power loss, preserving last known position and sensor history. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APX803L20-29SA-7 | Same 2.2 V threshold and 220 ms delay, but marked A429 (active status per DS38171 p.10); identical electrical specs and SOT23-3 footprint. | No functional difference; both support same µP reset timing and supply current profile. | Select A429-marked units for new designs requiring confirmed production availability per Diodes' latest marking table. |
| TLV803EA22DBZR | Texas Instruments part with 2.2 V threshold, 200 ms delay (±30%), 0.5 µA supply current, and same SOT23-3 pinout. | Lower supply current but tighter delay tolerance not specified; requires validation of reset timing margin in high-temperature operation. | Prefer for ultra-low-quiescent designs where 20 ms delay variation is acceptable and TI's qualification scope aligns with end-equipment requirements. |
Compared with APX803L20-37SA-7, the A429-marked variant offers identical performance with confirmed active status, while TLV803EA22DBZR trades slightly looser delay tolerance for lower supply current - making the former optimal for timing-critical industrial resets and the latter suitable for battery-limited consumer wearables.
Availability
APX803L20-37SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home motion detectors, and asset tracking beacons requiring stable component supply with consistent parametric performance across temperature and lot-to-lot production.
Supply support for APX803L20-37SA-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 solutions, with design centers across Asia, Europe, and the US and manufacturing in IATF 16949-certified facilities.
The APX803L series belongs to Diodes' precision power management portfolio, engineered specifically for low-power µP supervision in battery-operated and energy-constrained systems where reliability, accuracy, and minimal quiescent draw are mandatory.
FAQ
What is the exact reset threshold voltage for APX803L20-37SA-7?
The APX803L20-37SA-7 has a factory-trimmed reset threshold of 2.2 V with ±1.5% accuracy over temperature (–40°C to +85°C), as specified in Diodes' DS38171 Rev. 3–2, Section "Electrical Characteristics", parameter VTH. This value is fixed internally and cannot be adjusted externally.
Does APX803L20-37SA-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 10–100 kΩ to the host supply rail) is mandatory to generate a valid logic-high level when the output is inactive. No internal pull-up is present, per Pin Descriptions section of DS38171.
Can APX803L20-37SA-7 operate from a 1.8 V supply?
No - the minimum recommended VCC is 0.9 V, but the device requires VCC ≥ 1.02×VTH (≥2.244 V) to guarantee proper reset timeout behavior and output release, per "Recommended Operating Conditions" in DS38171. At 1.8 V, the internal reference and comparator will not function reliably.
Is APX803L20-37SA-7 qualified for automotive applications?
No - APX803L20-37SA-7 is not AEC-Q100 qualified. Diodes explicitly states in the datasheet that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and consumer applications only.
APX803L20-37SA-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:
- 143ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
APX803L20-37SA-7 FAQ
1.How can I place an order for APX803L20-37SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX803L20-37SA-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 APX803L20-37SA-7 reliable?
The price and inventory of APX803L20-37SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-37SA-7 is usually 5 days.
3.What payment methods are accepted for APX803L20-37SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-37SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX803L20-37SA-7?
APX803L20-37SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX803L20-37SA-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 APX803L20-37SA-7?
For technical support, including APX803L20-37SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-37SA-7 requirements.
6.How does Aetrix verify that APX803L20-37SA-7 is sourced from the original manufacturer or authorized distributors?
All APX803L20-37SA-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 APX803L20-37SA-7 meets industry standards.
7.What is the process for return or replacement of APX803L20-37SA-7?
All APX803L20-37SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-37SA-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 APX803L20-37SA-7 part is unused and in its original packaging.
Return procedure for APX803L20-37SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX803L20-37SA-7 Tags
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MIC826SYMT-TR
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