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

Diodes Incorporated APX809S05-40SR-7

Name: APX809S05-40SR-7
Brand: Diodes Incorporated
SKU: APX809S05-40SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX809S05-40SR-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX809S05-40SR-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX809S05-40SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 5V digital systems. It provides active-low reset assertion when VCC drops below 4.00V (typ), maintains reset for ≥240ms after recovery, and operates with 7µA supply current (typ) down to VCC = 1V. Used in portable equipment and embedded controllers requiring reliable power-on reset.

For engineers reviewing the APX809S05-40SR-7 datasheet, APX809S05-40SR-7 pinout, APX809S05-40SR-7 application, or APX809S05-40SR-7 equivalent, key selection criteria include reset threshold accuracy (±0.06V), push-pull output drive capability (1.2mA sink), temperature-stable threshold (30ppm/°C), and SOT23-SR package compatibility with high-density PCB layouts.

Technical Context

This device implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and internal power-on reset timer logic. The reset timeout is fixed at 240ms (min), independent of external components, and the comparator remains functional across VCC = 1.0V to 5.5V.

The push-pull output stage eliminates need for external pull-up resistors and guarantees valid logic states over full operating temperature (−40°C to +125°C) and supply range. Fast transient immunity is achieved via internal filtering that rejects sub-20µs VCC disturbances.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.00V (typ), ±0.06V tolerance - ensures reliable detection of 5V rail collapse before µP malfunction
Supply Current	7µA (typ) - enables multi-year battery life in coin-cell-powered IoT sensors
Reset Timeout	240ms (min) - satisfies JEDEC JESD85 power-on reset hold time for most ARM Cortex-M and PIC microcontrollers
Operating Voltage Range	1.0V to 5.5V - supports reset assertion even during brownout recovery and ultra-low-VCC test modes
Output Type	Active-low push-pull - drives RESET line directly without pull-up resistor, reducing BOM count and layout area
Temp Coefficient	30ppm/°C - maintains ≤0.1% threshold drift over −40°C to +125°C, critical for automotive under-hood applications

Pinout & Package

SOT23-3 (SR variant) surface-mount package with 2.4mm × 1.3mm footprint, 0.95mm height, and gull-wing leads. RoHS-compliant, halogen-free "Green" molding compound.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for internal comparator and output stage; must be connected to system ground plane for noise immunity
2	RESET	Active-low push-pull reset output; sinks 1.2mA minimum at 0.3V - directly interfaces µP /RESET pin
3	VCC	Power supply input; powers internal circuitry and defines detection threshold - no bypass capacitor required due to low ICC

Key Features

Feature	Design Value
Precision 4.00V threshold	Guaranteed 3.94V–4.05V window at +25°C - eliminates calibration in production test for 5V systems
No external components	Self-contained reset generator - removes discrete resistor/capacitor network, saving 2.5mm² PCB area
Valid reset at 1V VCC	Ensures deterministic reset assertion during deep brownout - prevents µP lockup in battery-depleted states
Push-pull output	Drives /RESET line to <0.3V (sink) and >0.8×VCC (source) - compatible with TTL, CMOS, and mixed-voltage µP inputs

Applications

Industrial PLC Controller

Medical Handheld Monitor

Use Scenario: Power sequencing in DIN-rail mounted programmable logic controllers with dual 24V/5V rails.

IC Role / Device Role / Timing Role: Monitors 5V logic rail and asserts /RESET to ARM Cortex-M7 core until stable post-power-up.

Use Value: 240ms guaranteed timeout prevents spurious boot attempts during 24V-to-5V DC/DC startup transients.

Use Scenario: Battery-backed vital signs monitor with Li-ion cell and low-power MCU.

IC Role / Device Role / Timing Role: Detects 5V rail collapse during battery swap and holds /RESET until new cell stabilizes.

Use Value: 7µA quiescent current extends 3.7V/1000mAh battery life by >18 months in standby mode.

Automotive Body Control Module

Smart Energy Meter

Use Scenario: Under-hood BCM exposed to −40°C to +125°C ambient with 5V MCU supply.

IC Role / Device Role / Timing Role: Supervises 5V rail generated from 12V battery; asserts /RESET on cold cranking dips.

Use Value: 30ppm/°C threshold stability ensures ≤0.03V drift over full temp range - avoids false resets.

Use Scenario: DIN-rail energy meter with isolated 5V supply and metrology SoC.

IC Role / Device Role / Timing Role: Provides power-on reset to AFE and communication processor during AC mains restoration.

Use Value: Push-pull output eliminates external pull-up, reducing leakage path and improving EMC robustness.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD2T	4.00V threshold, 140ms min timeout, open-drain output	Requires external pull-up resistor; less suitable for high-noise industrial environments	Select when legacy board reuse mandates open-drain topology and shorter timeout is acceptable
TPS3808G33DBVR	3.3V threshold, adjustable timeout (200ms–10s), higher 12µA ICC	Not pin-compatible; requires redesign for 5V rail monitoring	Choose only if system needs programmable delay or dual-voltage supervision capability

Compared with MAX809TRD2T and TPS3808G33DBVR, APX809S05-40SR-7 delivers superior noise immunity via push-pull drive, lower power consumption for battery operation, and tighter threshold tolerance - making it optimal for cost-sensitive, space-constrained 5V µP supervision where reliability and simplicity are prioritized.

Availability

APX809S05-40SR-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for APX809S05-40SR-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 APX809S/810S series belongs to Diodes' µP supervisory product line, engineered specifically for low-cost, high-reliability power monitoring in battery-powered and industrial embedded systems where minimal external components and guaranteed reset timing are essential.

FAQ

What is the exact reset threshold voltage for APX809S05-40SR-7?

The APX809S05-40SR-7 has a nominal reset threshold of 4.00V, with guaranteed limits of 3.94V (min) and 4.05V (max) at +25°C. This value is factory-trimmed and specified over −40°C to +125°C with a temperature coefficient of 30ppm/°C, ensuring predictable behavior across automotive and industrial environments.

Does APX809S05-40SR-7 require an external pull-up resistor on the RESET pin?

No. APX809S05-40SR-7 features a push-pull output stage capable of actively driving the RESET line low (≤0.3V at 1.2mA sink) and high (≥0.8×VCC at 500µA source). This eliminates the need for an external pull-up resistor, reducing component count, PCB area, and potential noise coupling paths.

Can APX809S05-40SR-7 operate with VCC below 2.0V?

Yes. The device guarantees valid reset assertion and output logic states down to VCC = 1.0V, enabling reliable operation during deep brownout conditions and battery depletion scenarios. Its internal comparator remains functional across the full 1.0V–5.5V supply range, with reset deassertion occurring only when VCC exceeds 1.02×VTH.

What is the difference between SOT23-SA and SOT23-SR package variants?

SOT23-SA and SOT23-SR are mechanically identical 3-pin packages but differ in leadframe plating and marking. SR denotes a matte-tin finish optimized for lead-free reflow, while SA uses a different plating process. Both share identical dimensions (2.4mm × 1.3mm), thermal resistance (θJA = 232°C/W), and soldering profiles per Diodes' package outline documentation.

APX809S05-40SR-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:: 4V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 20ms Minimum

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX809S05-40SR-7 FAQ

1.How can I place an order for APX809S05-40SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX809S05-40SR-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 APX809S05-40SR-7 reliable?

The price and inventory of APX809S05-40SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX809S05-40SR-7 is usually 5 days.

3.What payment methods are accepted for APX809S05-40SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX809S05-40SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX809S05-40SR-7?

APX809S05-40SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX809S05-40SR-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 APX809S05-40SR-7?

For technical support, including APX809S05-40SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX809S05-40SR-7 requirements.

6.How does Aetrix verify that APX809S05-40SR-7 is sourced from the original manufacturer or authorized distributors?

All APX809S05-40SR-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 APX809S05-40SR-7 meets industry standards.

7.What is the process for return or replacement of APX809S05-40SR-7?

All APX809S05-40SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX809S05-40SR-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 APX809S05-40SR-7 part is unused and in its original packaging.

Return procedure for APX809S05-40SR-7:

1.Submit a request within 90 days.

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

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