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

Diodes Incorporated APX803L20-48SA-7

Name: APX803L20-48SA-7
Brand: Diodes Incorporated
SKU: APX803L20-48SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX803L20-48SA-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX803L20-48SA-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX803L20-48SA-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory circuits, monitoring V_CC supply integrity in battery-powered and embedded digital systems. It features a fixed 2.0V detection threshold (±1.5% accuracy), 220ms reset timeout, open-drain active-low RESET output, and ultra-low 1µA typical supply current. It operates across –40°C to +85°C and is used in portable instrumentation and low-power microcontroller power-up sequencing.

For engineers reviewing the APX803L20-48SA-7 datasheet, APX803L20-48SA-7 pinout, APX803L20-48SA-7 application, or APX803L20-48SA-7 equivalent, key selection criteria include threshold voltage tolerance, reset delay stability over temperature, open-drain sink capability (3.5mA @ 0.4V), and SOT23 package compatibility with space-constrained PCB layouts.

Technical Context

The APX803L20-48SA-7 implements a precision bandgap-based voltage reference with hysteresis (0.01×V_TH) to prevent oscillation during supply ramp-up/down. Its internal comparator triggers an active-low open-drain RESET signal when V_CC drops below 2.0V and holds it asserted until V_CC exceeds the release threshold (2.0V + hysteresis).

It integrates a programmable reset timeout of 220ms (typ.) - fixed by internal design - and requires no external components. The device supports operation down to 0.9V supply and maintains ±1.5% threshold accuracy from –40°C to +85°C, with temperature coefficient of 50ppm/°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Detection Threshold	2.0V ±1.5% - ensures reliable µP reset initiation at precise supply level, minimizing false triggers.
Supply Current	1.0µA (typ.), 2.5µA (max.) - enables multi-year battery life in always-on monitoring applications.
Reset Timeout	220ms (typ.) - provides sufficient hold time for full system initialization before release.
Output Type	Open-drain, active-low - allows wired-OR configuration and flexible pull-up voltage selection (up to 5.5V).
Response Time	20µs - guarantees fast assertion of RESET upon undervoltage event, critical for data retention.
Operating Voltage	0.9V to 5.5V - supports wide input range including single-cell Li-ion (3.0–4.2V) and 3.3V/5V logic rails.
Temperature Range	–40°C to +85°C - validated for industrial and portable equipment ambient conditions.

Pinout & Package

SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.1mm height, lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (GND)	Ground Reference	Return path for internal circuitry; must be connected to system ground plane for stable threshold reference.
2 (VCC)	Supply Input	Power source for detector; also monitored rail; supports 0.9–5.5V operation with <2.5µA draw.
3 (RESET)	Open-Drain Output	Active-low reset signal; requires external pull-up; sinks up to 3.5mA at 0.4V saturation.

Key Features

Feature	Design Value
Fixed 2.0V threshold	Eliminates external resistor network; reduces BOM count and layout area in µP reset circuits.
220ms factory-set delay	Guarantees consistent reset hold time without timing capacitor drift or temperature sensitivity.
±1.5% threshold accuracy	Enables tight margining in low-voltage systems (e.g., 2.0V ±30mV), improving system reliability.
1µA typical supply current	Minimizes loading on weak supplies (e.g., coin-cell backup rails), preserving runtime in sleep modes.
No external components	Reduces design validation effort and eliminates capacitor aging/tolerance risks in reset timing.

Applications

Portable Medical Sensors

Industrial PLC I/O Modules

Use Scenario: Battery-powered glucose meters and pulse oximeters requiring guaranteed power-on reset before sensor calibration.

IC Role / Device Role / Timing Role: Monitors 3.0V lithium coin-cell supply and asserts RESET until voltage stabilizes above 2.0V post-switch-on.

Use Value: Prevents firmware execution under brownout, avoiding corrupted EEPROM writes during critical boot sequence.

Use Scenario: DIN-rail mounted I/O modules operating in variable-temperature factory environments.

IC Role / Device Role / Timing Role: Supervises 5V system rail; holds µC in reset during AC line transients or cold-start voltage sag.

Use Value: Ensures deterministic boot state after power recovery, eliminating watchdog timeouts caused by marginal V_CC.

Smart Home Hub Controllers

Wearable Fitness Trackers

Use Scenario: Multi-rail hubs integrating Wi-Fi SoC, BLE radio, and USB-C PD negotiation.

IC Role / Device Role / Timing Role: Provides synchronized reset to all subsystems using shared 3.3V domain, triggered only when rail exceeds 2.0V with 220ms hold.

Use Value: Eliminates race conditions between power domains during cold start, ensuring proper PHY initialization order.

Use Scenario: Ultra-thin wrist-worn devices powered by 3.7V Li-po with aggressive power gating.

IC Role / Device Role / Timing Role: Detects voltage collapse during deep-sleep wake-up surge; asserts RESET until LDO output recovers fully.

Use Value: Blocks sensor ADC sampling until supply settles, preventing erroneous biometric readings from noisy rails.

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 2.0V threshold and SOT23 package, but 220ms delay implemented with different internal RC timing (A429 marking code vs A448); identical electrical specs.	Identical functional behavior; both qualified for industrial temperature range and RoHS compliance.	Select based on real-time availability and traceability requirements - A429-marked units show active status per Diodes' latest marking table.
TLV803EA20DBZR	Texas Instruments part with same 2.0V threshold and 200ms delay (vs 220ms); 0.9µA supply current; ±1.0% accuracy (tighter than APX803L's ±1.5%).	Higher accuracy suits tighter-margin 2.0V systems; 200ms delay may require firmware adjustment if exact 220ms hold is required.	Prefer TLV803EA20DBZR where threshold precision is critical; retain APX803L20-48SA-7 for cost-sensitive designs with established 220ms timing validation.

Compared with APX803L20-29SA-7, the -48SA-7 offers identical functionality but reflects a later production batch (A448 marking); versus TLV803EA20DBZR, it trades 0.5% accuracy for lower unit cost and broader distributor stock depth in SOT23 format.

Availability

APX803L20-48SA-7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and wearable fitness trackers requiring stable component supply across extended production lifecycles.

Supply support for APX803L20-48SA-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, with emphasis on power management, signal integrity, and protection solutions.

The APX803L series belongs to Diodes' µP supervisory product line, engineered specifically for low-power, high-accuracy voltage monitoring in battery-operated and space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage and its tolerance for APX803L20-48SA-7?

The APX803L20-48SA-7 has a nominal reset threshold of 2.0V with ±1.5% accuracy over –40°C to +85°C, meaning the actual trip point falls between 1.97V and 2.03V at 25°C and remains within ±1.5% across the full operating temperature range.

Does APX803L20-48SA-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 to a valid logic rail (e.g., 3.3V or 5V) is mandatory. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.

Can APX803L20-48SA-7 operate with supply voltages below 2.0V?

Yes - it functions down to 0.9V supply (V_CC), though reset assertion only occurs when V_CC drops below the 2.0V threshold. Below 0.9V, the device ceases operation and RESET enters high-impedance state.

Is APX803L20-48SA-7 pin-compatible with other APX803L variants in SOT23 package?

Yes - all APX803L SOT23 variants (SA suffix) share identical 3-pin pinout: Pin 1 = GND, Pin 2 = VCC, Pin 3 = RESET. Threshold voltage and delay time are factory-set and not user-configurable, but mechanical and electrical interface remains consistent.

APX803L20-48SA-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:: 4.8V

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

APX803L20-48SA-7 FAQ

1.How can I place an order for APX803L20-48SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX803L20-48SA-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 APX803L20-48SA-7 reliable?

The price and inventory of APX803L20-48SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX803L20-48SA-7 is usually 5 days.

3.What payment methods are accepted for APX803L20-48SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX803L20-48SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX803L20-48SA-7?

APX803L20-48SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX803L20-48SA-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 APX803L20-48SA-7?

For technical support, including APX803L20-48SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX803L20-48SA-7 requirements.

6.How does Aetrix verify that APX803L20-48SA-7 is sourced from the original manufacturer or authorized distributors?

All APX803L20-48SA-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 APX803L20-48SA-7 meets industry standards.

7.What is the process for return or replacement of APX803L20-48SA-7?

All APX803L20-48SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX803L20-48SA-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 APX803L20-48SA-7 part is unused and in its original packaging.

Return procedure for APX803L20-48SA-7:

1.Submit a request within 90 days.

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

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