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

Diodes Incorporated APX810S-31SR-7

Name: APX810S-31SR-7
Brand: Diodes Incorporated
SKU: APX810S-31SR-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: APX810S-31SR-7

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: APX810S-31SR-7.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23

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Product details

Overview

APX810S-31SR-7 from Diodes Incorporated is a micro-power voltage detector IC designed for µP supervisory functions in 3.0V digital systems. It provides active-high push-pull RESET output with 3.08V threshold (±0.04V), 240ms minimum reset timeout, 7µA typical supply current, and guaranteed operation down to VCC = 1.0V - used in battery-powered controllers and embedded instrumentation.

For engineers reviewing the APX810S-31SR-7 datasheet, APX810S-31SR-7 pinout, APX810S-31SR-7 application, or APX810S-31SR-7 equivalent, key selection criteria include reset threshold accuracy at temperature, low-I_CC across -40°C to +125°C, push-pull drive capability (1.2mA sink), and SOT23-SR package compatibility with space-constrained PCB layouts.

Technical Context

The APX810S-31SR-7 integrates a precision bandgap reference, comparator, and power-on reset timer in a single die. Its reset assertion logic triggers when VCC falls below 3.04–3.12V and holds RESET high for ≥240ms after VCC exceeds the threshold - independent of supply ramp rate.

Designed for immunity to fast transients, it guarantees correct logic state at VCC ≥1.0V and features ±30ppm/°C threshold drift over -40°C to +125°C. The push-pull output eliminates external pull-up resistors and supports direct interface to µP RESET inputs without level-shifting.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	3.08V (typ), 3.04–3.12V (min/max) - precisely monitors 3.0V supply rails with <±1.3% error
Reset Timeout	240ms (typ), 140–280ms (min/max) - ensures reliable µP initialization after brownout recovery
Supply Current	7µA (typ), ≤16µA (max) - enables multi-year battery life in portable equipment
Operating Voltage	1.0–5.5V - supports valid reset assertion even during deep brownout or cold-start conditions
Output Type	Push-pull active-high - drives RESET input directly; no external pull-up required
Temp Range	-40°C to +125°C - fully specified for industrial and automotive under-hood environments
Threshold Drift	±30ppm/°C - maintains <±1.5% total threshold variation across full operating range

Pinout & Package

SOT23-SR (3-pin, standard footprint per Diodes Inc. outline drawing; 2.4mm × 1.3mm × 1.0mm body height; RoHS-compliant "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
2	RESET	Active-high push-pull output; sinks 1.2mA @ VCC ≥ VTH+0.2V; asserts high during undervoltage condition
3	VCC	Power supply input; powers internal circuitry and defines detection threshold via internal bandgap reference

Key Features

Feature	Design Value
Precision 3.08V threshold	±0.04V tolerance enables accurate monitoring of 3.0V systems without calibration
240ms reset timeout	Guaranteed minimum delay prevents premature µP release during supply stabilization
7µA supply current	Reduces standby power by >90% vs. legacy reset ICs, critical for coin-cell applications
1.0V valid operation	Ensures deterministic reset behavior during deep brownout or battery depletion
Push-pull output	Eliminates need for external pull-up resistor, saving board space and BOM cost

Applications

Industrial Controllers

Battery-Powered Sensors

Use Scenario: Programmable logic controllers (PLCs) operating on 3.0V backup rails during AC mains failure.

IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to halt CPU execution until 3.0V rail stabilizes post-failure.

Use Value: Prevents corrupted firmware writes or erratic I/O states during undervoltage events with <1.3% threshold accuracy.

Use Scenario: Wireless environmental sensor nodes powered by CR2032 coin cells with 2.8–3.2V discharge profile.

IC Role / Device Role / Timing Role: Monitors declining battery voltage and forces controlled shutdown before data loss occurs.

Use Value: 7µA quiescent current extends operational lifetime beyond 5 years; 1.0V operation captures final low-voltage readings.

Medical Handheld Devices

Automotive Body Control Modules

Use Scenario: Portable glucose meters requiring deterministic startup and fault-safe shutdown under variable battery conditions.

IC Role / Device Role / Timing Role: Supervises main 3.0V LDO output and asserts RESET to microcontroller upon voltage sag.

Use Value: ±30ppm/°C drift ensures stable threshold across 0–50°C ambient range; push-pull output interfaces directly to ARM Cortex-M0 RESET pin.

Use Scenario: Door module ECUs powered from vehicle battery (9–16V) with local 3.0V domain for MCU and CAN transceiver.

IC Role / Device Role / Timing Role: Detects dropout in 3.0V rail caused by load dump or alternator failure; holds RESET high for 240ms during recovery.

Use Value: Guaranteed operation to -40°C/+125°C meets AEC-Q100 Grade 2 requirements; 200ms typ pulse width satisfies ISO 16750-2 transient immunity timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD1T1G	3.08V threshold, open-drain output, 1.6µA I_CC, requires external pull-up	Limited drive strength; unsuitable where µP RESET pin demands active-high push-pull	Select only if board layout allows pull-up resistor and µP accepts open-drain RESET
TPS3808G30DBVR	3.0V threshold, push-pull active-high, 1.1µA I_CC, 200ms timeout, wider VCC range (0.8–6.0V)	Lower quiescent current but higher cost; requires different PCB footprint (SOT23-6)	Prefer for ultra-low-power designs where SOT23-6 routing is acceptable and budget permits

Compared with MAX809TRD1T1G and TPS3808G30DBVR, the APX810S-31SR-7 delivers optimal balance of precision threshold, push-pull drive, and SOT23-3 compatibility - enabling drop-in replacement in existing 3-pin supervisor footprints while maintaining <±1.3% accuracy and 240ms reset hold time.

Availability

APX810S-31SR-7 is available at Aetrix Electronics and suitable for industrial controllers, battery-powered sensors, medical handheld devices, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for APX810S-31SR-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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The APX810S series belongs to Diodes' µP supervisory product line, engineered specifically for low-cost, low-power voltage monitoring in space-constrained embedded systems with stringent thermal and longevity requirements.

FAQ

What is the exact reset threshold voltage for APX810S-31SR-7?

The APX810S-31SR-7 has a nominal reset threshold of 3.08V, with guaranteed min/max values of 3.04V and 3.12V respectively at +25°C. This value is factory-trimmed and remains stable across temperature with ±30ppm/°C drift, making it suitable for precise 3.0V rail supervision.

Does APX810S-31SR-7 require an external pull-up resistor?

No. The APX810S-31SR-7 features a push-pull active-high RESET output capable of sourcing/sinking up to 1.2mA, eliminating the need for an external pull-up resistor. This reduces BOM count, saves PCB area, and ensures robust logic-level transitions without external component dependencies.

Can APX810S-31SR-7 operate reliably below 2.0V supply?

Yes. The device is fully functional and guarantees correct RESET assertion down to VCC = 1.0V, with all electrical specifications validated across 1.0–5.5V. This enables reliable brownout detection during deep battery discharge or cold-start scenarios where supply may dip below 2.0V.

What is the difference between SOT23-SA and SOT23-SR packages for this part?

Both SOT23-SA and SOT23-SR are 3-pin SOT23 variants with identical electrical characteristics and thermal performance. The SR variant uses Diodes Inc.'s standard SOT23 outline (2.4mm × 1.3mm), while SA refers to an earlier revision; APX810S-31SR-7 is manufactured exclusively in the SR package per ordering information and marking tables in DS39140 Rev. 2–2.

APX810S-31SR-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:: 3.08V

Output:: Push-Pull, Totem Pole

Reset:: Active High

Reset Timeout:: 140ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

APX810S-31SR-7 FAQ

1.How can I place an order for APX810S-31SR-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for APX810S-31SR-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 APX810S-31SR-7 reliable?

The price and inventory of APX810S-31SR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX810S-31SR-7 is usually 5 days.

3.What payment methods are accepted for APX810S-31SR-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX810S-31SR-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for APX810S-31SR-7?

APX810S-31SR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your APX810S-31SR-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 APX810S-31SR-7?

For technical support, including APX810S-31SR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX810S-31SR-7 requirements.

6.How does Aetrix verify that APX810S-31SR-7 is sourced from the original manufacturer or authorized distributors?

All APX810S-31SR-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 APX810S-31SR-7 meets industry standards.

7.What is the process for return or replacement of APX810S-31SR-7?

All APX810S-31SR-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX810S-31SR-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 APX810S-31SR-7 part is unused and in its original packaging.

Return procedure for APX810S-31SR-7:

1.Submit a request within 90 days.

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

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