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

Diodes Incorporated APX809-44SAG-7

Name: APX809-44SAG-7
Brand: Diodes Incorporated
SKU: APX809-44SAG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX809-44SAG-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX809-44SAG-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-3

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Product details

Overview

APX809-44SAG-7 from Diodes Incorporated is a 3-pin microprocessor reset supervisor IC with active-low push-pull RESET output, precision 4.38 V reset threshold (min 4.29 V, max 4.47 V), 200 ms typical reset timeout, 30 µA typical supply current, and guaranteed operation down to VCC = 1 V. It monitors 5 V digital power rails in embedded controllers and portable systems to prevent erroneous code execution during brownout or power-up.

For engineers reviewing the APX809-44SAG-7 datasheet, APX809-44SAG-7 pinout, APX809-44SAG-7 application, or APX809-44SAG-7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), push-pull drive capability (1.2 mA sink), SOT23-3 package compatibility, and validity of reset assertion at low VCC.

Technical Context

The APX809-44SAG-7 integrates a precision voltage comparator with internal reference and a monostable timer to generate a clean, glitch-immune reset pulse. Its reset comparator ignores fast transients on VCC and maintains correct logic state for supply voltages as low as 1 V.

It operates across -40°C to +85°C ambient, features 30 ppm/°C reset threshold tempco, and delivers a guaranteed minimum 140 ms reset timeout (200 ms typical, up to 280 ms) after VCC rises above threshold - ensuring reliable µP initialization in noisy or slow-ramping power environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.38 V (typ), 4.29–4.47 V range - ensures reset asserts before 5 V rail drops below 4.3 V, compatible with 5 V ±5% systems
Reset Timeout	200 ms (typ), 140–280 ms - guarantees sufficient hold time for full µP boot sequence
Supply Current	30 µA (typ) at +25°C - enables use in battery-powered devices with multi-year standby life
Output Type	Push-pull active-low - eliminates need for external pull-up resistor; drives CMOS inputs directly
VCC Validity Range	1.0–5.5 V - reset remains valid down to 1 V, supporting brownout detection in low-voltage recovery
ESD Protection	5 kV HBM - robust handling in manufacturing and field assembly without added protection circuitry

Pinout & Package

SOT23-3 (SA package) surface-mount package with 2.4 mm × 1.3 mm footprint, 0.95 mm height, and thermal resistance θ_JA = 201°C/W on standard FR-4 PCB.

Pin/Terminal	Circuit Role	Design Meaning
1 (VCC)	Power Supply Input	Accepts 1.1–5.5 V; powers internal comparator and timer; must be decoupled locally
2 (GND)	Ground Reference	Return path for all internal circuits; requires low-impedance connection to system ground plane
3 (RESET)	Active-Low Reset Output	Push-pull driver sinks ≥1.2 mA at 0.3 V; asserts logic low during reset; no external pull-up needed

Key Features

Feature	Design Value
Precision 4.38 V threshold	±1.5% tolerance over -40°C to +85°C ensures deterministic reset point in 5 V systems
Guaranteed reset validity to VCC = 1 V	Enables reliable brownout detection even during deep undervoltage events prior to shutdown
No external components required	Reduces BOM count and board area vs. discrete RC reset solutions; simplifies layout and qualification
200 ms typ reset timeout	Meets JEDEC JESD8-12B requirements for microprocessor power-on reset duration

Applications

Industrial PLC Controllers

Portable Medical Monitors

Use Scenario: Power sequencing in DIN-rail mounted programmable logic controllers with 5 V FPGA and MCU subsystems.

IC Role / Device Role / Timing Role: Supervises main 5 V rail and asserts synchronous reset to both FPGA configuration logic and ARM Cortex-M core.

Use Value: Prevents partial configuration or corrupted register states during AC line sags by holding reset until rail stabilizes >4.29 V for ≥140 ms.

Use Scenario: Battery-backed vital signs monitor with low-power sleep mode and rapid wake-on-event.

IC Role / Device Role / Timing Role: Monitors 5 V DC-DC output powering ADC, display driver, and BLE SoC; provides clean reset on battery swap or low-battery cutoff.

Use Value: 30 µA quiescent current extends shelf life; 1 V VCC validity ensures reset remains asserted during final battery discharge phase.

Network Edge Routers

Automotive Infotainment Head Units

Use Scenario: Multi-rail power management in fanless enterprise switches with PoE-derived 5 V auxiliary supply.

IC Role / Device Role / Timing Role: Detects undershoot on isolated 5 V rail caused by transient load switching; triggers hardware reset of packet processor.

Use Value: Push-pull output drives reset net without pull-up, eliminating risk of floating node during hot-swap or ESD events.

Use Scenario: 5 V domain supervision in head unit mainboard where ignition-switched supply experiences ripple and dropouts.

IC Role / Device Role / Timing Role: Resets application processor and audio codec when 5 V rail dips below 4.29 V due to alternator load dump or cold-crank.

Use Value: 30 ppm/°C tempco maintains threshold stability across under-hood temperature extremes (-40°C to +85°C).

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD2T	4.40 V threshold (±2.5%), 140 ms min timeout, 15 µA I_CC, SOT23-3	Lower quiescent current but wider threshold tolerance; less stable over temperature (50 ppm/°C)	Select for ultra-low-power designs where 0.02 V higher threshold margin is acceptable and tighter tempco is not required.
TPS3808G33DBVR	3.08 V threshold, adjustable via external resistor, 200 ms fixed timeout, 12 µA I_CC, SOT23-6	Requires external resistor for 4.38 V setting; larger package; supports manual reset input	Choose only if design requires manual reset capability or future voltage flexibility; adds cost and board space.

Compared with MAX809TRD2T and TPS3808G33DBVR, the APX809-44SAG-7 offers superior threshold accuracy (±1.5% vs ±2.5%) and temperature stability (30 ppm/°C vs 50 ppm/°C), making it optimal for 5 V systems where precise brownout detection is critical - without requiring external components or larger footprints.

Availability

APX809-44SAG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and network edge routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for APX809-44SAG-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The APX809/810 series belongs to Diodes' supervisory IC product line, engineered specifically for cost-sensitive, space-constrained microprocessor reset applications in consumer, industrial, and computing equipment - emphasizing precision, low power, and zero-component integration.

FAQ

What is the exact reset threshold voltage for APX809-44SAG-7?

The APX809-44SAG-7 has a nominal reset threshold of 4.38 V, with a guaranteed range of 4.29 V to 4.47 V across -40°C to +85°C ambient temperature. This value is laser-trimmed during production and specified in the DS31322 Rev. 5 datasheet Table 1, confirming its suitability for 5 V ±5% supply monitoring.

Does APX809-44SAG-7 require an external pull-up resistor on the RESET pin?

No. The APX809-44SAG-7 features a push-pull output stage that actively drives RESET low during assertion and high when released. Unlike open-drain supervisors, it does not require an external pull-up resistor - reducing BOM count and eliminating potential noise coupling through resistor parasitics.

Can APX809-44SAG-7 operate reliably below 1.1 V VCC?

No. While the device guarantees correct RESET logic state down to VCC = 1.0 V, its recommended operating VCC range is 1.1 V to 5.5 V per the datasheet's Recommended Operating Conditions table. Operation below 1.1 V is outside specification and may result in undefined timing or comparator behavior.

Is APX809-44SAG-7 pin-compatible with APX809-44SRG-7?

Yes. Both APX809-44SAG-7 and APX809-44SRG-7 use identical SOT23-3 pinout (VCC, GND, RESET) and electrical specifications. The "SA" and "SR" suffixes denote minor package variant differences (leadframe material and mold compound), but mechanical and functional pin compatibility is maintained per Diodes' package outline documentation.

APX809-44SAG-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:: Not For New Designs

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.38V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 140ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX809-44SAG-7 FAQ

1.How can I place an order for APX809-44SAG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX809-44SAG-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 APX809-44SAG-7 reliable?

The price and inventory of APX809-44SAG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809-44SAG-7 is usually 5 days.

3.What payment methods are accepted for APX809-44SAG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809-44SAG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX809-44SAG-7?

APX809-44SAG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX809-44SAG-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 APX809-44SAG-7?

For technical support, including APX809-44SAG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809-44SAG-7 requirements.

6.How does Aetrix verify that APX809-44SAG-7 is sourced from the original manufacturer or authorized distributors?

All APX809-44SAG-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 APX809-44SAG-7 meets industry standards.

7.What is the process for return or replacement of APX809-44SAG-7?

All APX809-44SAG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809-44SAG-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 APX809-44SAG-7 part is unused and in its original packaging.

Return procedure for APX809-44SAG-7:

1.Submit a request within 90 days.

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

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