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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated APX803L-35SA-7

Name: APX803L-35SA-7
Brand: Diodes Incorporated
SKU: APX803L-35SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L-35SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: APX803L-35SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX803L-35SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, providing precise 3.5V threshold detection with ±1.5% accuracy, 1µA typical supply current, and 220ms reset timeout. It features open-drain active-low RESET output and operates across -40°C to +85°C in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the APX803L-35SA-7 datasheet, APX803L-35SA-7 pinout, APX803L-35SA-7 application, or APX803L-35SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay timing stability over temperature, low-quiescent-current impact on battery life, and SOT23 package compatibility with high-density PCB layouts.

Technical Context

The APX803L-35SA-7 implements a precision bandgap-based voltage reference with internal hysteresis (0.01×V_TH) to prevent oscillation during power-up/down transitions. Its comparator continuously monitors V_CC against the fixed 3.5V threshold and asserts the open-drain RESET pin low when V_CC drops below that level.

Reset assertion remains active until V_CC rises above the release threshold (V_{TH_H} = V_{TH_L} + V_HYS), with built-in 220ms timeout ensuring reliable processor initialization. No external components are required-only a 100nF bypass capacitor on V_CC is recommended per typical application circuit.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage	3.5V ±1.5% - ensures accurate brown-out detection for 3.3V systems with margin
Supply Current	1.0µA typical - enables multi-year operation on coin-cell batteries
Reset Timeout	220ms - guarantees sufficient hold time for full µP boot sequence
Output Type	Open-drain, active-low - supports wired-OR reset bus and flexible pull-up voltage selection
Operating Temp	-40°C to +85°C - validated for industrial and portable equipment environments
Response Time	20µs - provides fast fault reaction before system state corruption occurs
Hysteresis	0.01×V_TH (35mV) - prevents chatter during slow-rising/falling supply rails

Pinout & Package

APX803L-35SA-7 is housed in a 3-pin SOT23 package (JEDEC MO-203AA), with 1.3mm × 2.9mm footprint and 1.45mm height. The package supports reflow soldering per J-STD-020 and is fully RoHS-compliant, halogen-free, and lead-free.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for internal comparator and output stage
2	RESET	Open-drain output; pulled low during reset condition; requires external pull-up
3	V_CC	Power input (0.9–5.5V); supplies internal reference and logic

Key Features

Feature	Design Value
Fixed 3.5V threshold	Eliminates external resistor divider, reducing BOM count and layout area
220ms factory-set delay	Matches typical ARM Cortex-M boot duration without timing component tuning
±1.5% threshold accuracy	Guarantees detection within 52.5mV of 3.5V across full temperature range
1µA supply current	Reduces standby power draw by >95% versus legacy reset ICs (e.g., MAX809)
Open-drain output	Enables shared reset bus across multiple ICs with single pull-up resistor

Applications

Smart Wearable Sensors

Industrial PLC I/O Modules

Use Scenario: Continuous monitoring of Li-ion battery voltage in fitness trackers with BLE connectivity.

IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET to nRF52840 MCU during undervoltage events.

Use Value: Prevents flash corruption and sensor data loss by holding MCU in reset until battery recovers above 3.5V.

Use Scenario: Power sequencing and fault recovery in DIN-rail mounted digital input modules.

IC Role / Device Role / Timing Role: Supervises 3.3V logic rail feeding FPGA configuration and isolation drivers.

Use Value: Ensures deterministic startup after AC line interruption via 220ms timeout aligned with FPGA configuration clock requirements.

Portable Medical Monitors

Automotive Body Control Units

Use Scenario: ECG patch device powered by CR2032 coin cell with ultra-low leakage design.

IC Role / Device Role / Timing Role: Detects end-of-life battery drop below 3.5V and triggers graceful shutdown sequence.

Use Value: Extends usable battery life by minimizing quiescent current (1µA) while maintaining safe operating margins.

Use Scenario: Monitoring 5V supply derived from vehicle battery in door module ECUs.

IC Role / Device Role / Timing Role: Generates clean reset pulse for Infineon AURIX TC3xx microcontroller during cold-cranking transients.

Use Value: Tolerates 3.5V threshold hysteresis and 20µs response to avoid false resets during engine start voltage sag.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV803E35DBVR	3.5V threshold, 200ms delay, 0.5µA I_CC, SOT23-3	Lower supply current but tighter temp drift (±2.5% vs ±1.5%)	Prefer for ultra-long-life battery apps where 0.5µA savings outweighs accuracy trade-off
MAX809SEUR+T	3.08V threshold, 140ms delay, 12µA I_CC, SOT23-3	Higher current draw and lower threshold; no 3.5V option in MAX809 family	Only suitable if system tolerates 3.08V trip point and can accommodate 12× higher quiescent load

Compared with TLV803E35DBVR and MAX809SEUR+T, the APX803L-35SA-7 delivers superior threshold accuracy at minimal current cost, making it optimal for 3.3V systems requiring tight brown-out control without sacrificing battery runtime.

Availability

APX803L-35SA-7 is available at Aetrix Electronics and suitable for smart wearables, portable medical monitors, and industrial PLC I/O modules requiring stable component supply across extended production lifecycles.

Supply support for APX803L-35SA-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 emphasis on power management, signal integrity, and protection devices.

The APX803L series belongs to Diodes' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power monitoring in space-constrained portable and industrial electronics.

FAQ

What is the exact reset threshold voltage for APX803L-35SA-7?

The APX803L-35SA-7 has a factory-trimmed nominal reset threshold of 3.5V with guaranteed accuracy of ±1.5% over -40°C to +85°C ambient temperature. This corresponds to a minimum threshold of 3.4475V and maximum of 3.5525V at +25°C, confirmed in Electrical Characteristics Table (DS38171 Rev. 3-2, p.4).

Does APX803L-35SA-7 require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and must be pulled up externally to a valid logic-high voltage (e.g., 3.3V or 5V). Diodes recommends a 10kΩ–100kΩ resistor depending on bus capacitance and rise-time requirements; no internal pull-up is integrated.

Can APX803L-35SA-7 operate with supply voltages below 3.5V?

Yes - the device functions with V_CC as low as 0.9V (per Recommended Operating Conditions), but reset assertion only occurs when V_CC falls below 3.5V. Below ~1.0V, internal circuitry may cease operation, though the datasheet specifies functional behavior down to 0.9V.

Is APX803L-35SA-7 qualified for automotive applications?

No - APX803L-35SA-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., APX803L-35SA-7Q) with PPAP capability and IATF 16949 manufacturing, but this specific part number is rated for industrial temperature range (-40°C to +85°C) only.

APX803L-35SA-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:: 3.5V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX803L-35SA-7 FAQ

1.How can I place an order for APX803L-35SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L-35SA-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 APX803L-35SA-7 reliable?

The price and inventory of APX803L-35SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L-35SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L-35SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L-35SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L-35SA-7?

APX803L-35SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L-35SA-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 APX803L-35SA-7?

For technical support, including APX803L-35SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L-35SA-7 requirements.

6.How does Aetrix verify that APX803L-35SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L-35SA-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 APX803L-35SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L-35SA-7?

All APX803L-35SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L-35SA-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 APX803L-35SA-7 part is unused and in its original packaging.

Return procedure for APX803L-35SA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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