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

Analog Devices Inc./Maxim Integrated DS1817R-20-U+

Name: DS1817R-20-U+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1817R-20-U+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1817R-20-U+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

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

Datasheet:: DS1817R-20-U+.pdf

Description:: ACTIVE HIGH 3.3V ECONORESET

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Product details

Overview

DS1817R-20-U+ from Maxim Integrated is a precision voltage-monitoring reset IC with active-high push-pull output, designed for 3.0V systems requiring ±20% V_CC trip tolerance. It asserts reset for 150 ms after power recovery, integrates a temperature-compensated voltage reference, and operates from -40°C to +85°C in SOT-23 package.

For engineers reviewing the DS1817R-20-U+ datasheet, DS1817R-20-U+ pinout, DS1817R-20-U+ application, or DS1817R-20-U+ equivalent, key selection criteria include its 2.47–2.64 V trip point, 100–250 ms reset timeout, push-pull output drive capability, RoHS-compliant SOT-23-3 packaging, and suitability for low-voltage microprocessor supervision in space-constrained industrial controls.

Technical Context

The DS1817R-20-U+ uses an internal precision temperature-compensated voltage reference and comparator to detect V_CC deviations beyond ±20% of nominal 3.0V. Upon out-of-tolerance detection, it immediately asserts RST high; upon return to tolerance, it holds RST active for 100–250 ms (typ. 150 ms) to ensure system stabilization.

Its CMOS-compatible push-pull output delivers VOH ≥ V_CC – 0.1V at 0–500 µA load and sinks up to 10 mA, eliminating external pull-up resistors. Operating current is only 28–35 µA over full temperature range, supporting battery-backed or low-power embedded applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Trip Point	2.47 V (min) to 2.64 V (max); precise threshold for 3.0V ±20% systems
Reset Timeout (t_RST)	100–250 ms; ensures stable power and processor initialization before release
Output Type	Push-pull active-high; eliminates need for external pull-up resistor
Supply Voltage Range	0–5.5 V; supports operation across wide input range including brownout conditions
Operating Current (I_CC)	28–35 µA; enables long-term use in energy-sensitive applications
Temperature Range	-40°C to +85°C; qualified for industrial-grade embedded environments
Output Drive (I_OL)	10 mA sink capability; directly interfaces with standard logic inputs without buffering

Pinout & Package

SOT-23-3 surface-mount package (5.0 mm × 2.8 mm × 1.3 mm), RoHS-compliant, lead-free, with gull-wing leads and moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (RST)	Active-high reset output	CMOS push-pull driver; asserts high during power fault or startup delay
2 (V_CC)	Power supply input	Monitored voltage rail; powers internal reference and comparator circuitry
3 (GND)	Ground reference	Common return path for V_CC sensing and output stage; must be low-impedance

Key Features

Feature	Design Value
±20% V_CC monitoring tolerance	Optimized for 3.0V systems where wider supply variation is acceptable or expected
150 ms typ. reset hold time	Guarantees sufficient stabilization time for microcontrollers and peripheral ICs post-power-up
Integrated temp-compensated reference	Eliminates drift-induced false resets across -40°C to +85°C operating range
RoHS-compliant SOT-23-3 package	Enables automated assembly and meets environmental compliance requirements for modern PCBs
Low 35 µA max quiescent current	Minimizes standby power draw in always-on or battery-powered supervisory circuits

Applications

Industrial PLC I/O Modules	Smart Energy Meters
Use Scenario: Power supervision in DIN-rail mounted programmable logic controllers exposed to fluctuating AC-DC converter outputs. IC Role / Device Role / Timing Role: Monitors 3.0V auxiliary rail and asserts reset to prevent firmware corruption during line sags or surges. Use Value: The 2.47–2.64 V trip window accommodates aging power supplies while maintaining reliable reset assertion under worst-case brownout.	Use Scenario: Supervising microcontroller operation in utility-grade electricity meters with backup coin-cell batteries. IC Role / Device Role / Timing Role: Provides clean power-on reset and detects main supply collapse to trigger safe shutdown and data retention routines. Use Value: 150 ms guaranteed reset pulse ensures complete RAM initialization and EEPROM write completion before application code execution.
Medical Diagnostic Handhelds	Automotive Body Control Modules
Use Scenario: Ensuring deterministic boot behavior in portable ultrasound or glucose monitor devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Tracks declining battery voltage and forces controlled reset before undervoltage lockout disrupts sensor calibration sequences. Use Value: Push-pull output drives MCU reset pin directly-no external components required-reducing BOM count and board area in compact enclosures.	Use Scenario: Monitoring 3.3V domain in body electronics modules subject to load-dump transients and cold-crank voltage dips. IC Role / Device Role / Timing Role: Detects V_CC excursions outside ±20% and holds reset until stabilized, preventing erratic CAN node behavior. Use Value: Temperature-compensated reference maintains trip accuracy across under-hood thermal cycling (-40°C to +85°C), avoiding spurious resets.

Industrial PLC I/O Modules

Smart Energy Meters

Use Scenario: Power supervision in DIN-rail mounted programmable logic controllers exposed to fluctuating AC-DC converter outputs.

IC Role / Device Role / Timing Role: Monitors 3.0V auxiliary rail and asserts reset to prevent firmware corruption during line sags or surges.

Use Value: The 2.47–2.64 V trip window accommodates aging power supplies while maintaining reliable reset assertion under worst-case brownout.

Use Scenario: Supervising microcontroller operation in utility-grade electricity meters with backup coin-cell batteries.

IC Role / Device Role / Timing Role: Provides clean power-on reset and detects main supply collapse to trigger safe shutdown and data retention routines.

Use Value: 150 ms guaranteed reset pulse ensures complete RAM initialization and EEPROM write completion before application code execution.

Medical Diagnostic Handhelds

Automotive Body Control Modules

Use Scenario: Ensuring deterministic boot behavior in portable ultrasound or glucose monitor devices powered by single-cell Li-ion batteries.

IC Role / Device Role / Timing Role: Tracks declining battery voltage and forces controlled reset before undervoltage lockout disrupts sensor calibration sequences.

Use Value: Push-pull output drives MCU reset pin directly-no external components required-reducing BOM count and board area in compact enclosures.

Use Scenario: Monitoring 3.3V domain in body electronics modules subject to load-dump transients and cold-crank voltage dips.

IC Role / Device Role / Timing Role: Detects V_CC excursions outside ±20% and holds reset until stabilized, preventing erratic CAN node behavior.

Use Value: Temperature-compensated reference maintains trip accuracy across under-hood thermal cycling (-40°C to +85°C), avoiding spurious resets.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-monitoring reset applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326–26D	Fixed 2.63V trip point; 140 ms min reset timeout; same SOT-23-3 package	Narrower ±2% tolerance; better suited for tighter-regulated 2.5V/3.3V rails	Select when higher trip accuracy is required and ±2% V_CC variation is guaranteed
TPS3808G12DBVR	Adjustable trip via external resistor divider; 200 ms default timeout; 1.5 µA quiescent current	Requires external components; supports custom thresholds beyond fixed 20% range	Choose when system-specific trip voltage or ultra-low power (<5 µA) is mandatory

Compared with DS1817R-20-U+, MAX6326–26D offers tighter trip accuracy but less tolerance margin, while TPS3808G12DBVR adds design flexibility at the cost of component count and layout complexity-DS1817R-20-U+ remains optimal for cost-sensitive, fixed-threshold 3.0V supervision.

Availability

DS1817R-20-U+ is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, medical handheld diagnostics, and automotive body control modules requiring stable component supply with guaranteed RoHS compliance and SOT-23-3 footprint consistency.

Supply support for DS1817R-20-U+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, communications, computing, and consumer applications.

The DS1817R-20-U+ belongs to Maxim's EconoReset™ family of supervisory circuits, engineered specifically for cost-effective, high-reliability power monitoring and reset generation in resource-constrained embedded systems.

FAQ

What is the exact V_CC trip voltage range for DS1817R-20-U+?

The DS1817R-20-U+ has a guaranteed V_CC trip point between 2.47 V (minimum) and 2.64 V (maximum), corresponding to ±20% of a nominal 3.0V supply. This range is validated across -40°C to +85°C and accounts for process, voltage, and temperature variation. The DS1817R-20-U+ uses an internal temperature-compensated reference to maintain this accuracy without external calibration.

Does DS1817R-20-U+ require an external pull-up resistor on the RST pin?

No, DS1817R-20-U+ does not require an external pull-up resistor. Its RST pin features a push-pull active-high output capable of sourcing V_CC – 0.1V at up to 500 µA and sinking 10 mA. This eliminates external components and simplifies PCB layout-confirmed in the DS1817R-20-U+ datasheet's DC electrical characteristics table and block diagram.

How long is the reset pulse duration for DS1817R-20-U+ after V_CC returns to tolerance?

The DS1817R-20-U+ holds the RST pin active high for 100–250 ms (typical 150 ms) after V_CC recovers to within its ±20% trip window. This timing is internally generated and independent of external capacitance. The DS1817R-20-U+ datasheet specifies t_RST in the AC Electrical Characteristics table and confirms it applies to both power-up and power-down recovery scenarios.

Is DS1817R-20-U+ compatible with 3.3V microcontrollers?

Yes, DS1817R-20-U+ is compatible with 3.3V microcontrollers. Its V_CC trip range (2.47–2.64 V) falls within the valid undervoltage detection band for many 3.3V MCUs, and its push-pull RST output swings rail-to-rail (0 V to V_CC), ensuring clean logic-level signaling. The DS1817R-20-U+ datasheet explicitly lists "3.3V-20%" in its part number table and application examples.

What package and RoHS status does DS1817R-20-U+ have?

DS1817R-20-U+ is supplied in a RoHS-compliant, lead-free SOT-23-3 package (drawing code U3+4*), with dimensions 5.0 mm × 2.8 mm × 1.3 mm. The "+" suffix in the part number denotes RoHS/lead-free compliance, confirmed in Maxim's official part number table and materials analysis documentation for DS1817R-20-U+.

DS1817R-20-U+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: EconoReset

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

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Type:: Power Supply Monitor

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.55V

Output:: Push-Pull, Totem Pole

Reset:: Active High

Reset Timeout:: 100ms Minimum

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

DS1817R-20-U+ FAQ

1.How can I place an order for DS1817R-20-U+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1817R-20-U+ 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 DS1817R-20-U+ reliable?

The price and inventory of DS1817R-20-U+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1817R-20-U+ is usually 5 days.

3.What payment methods are accepted for DS1817R-20-U+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1817R-20-U+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1817R-20-U+?

DS1817R-20-U+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1817R-20-U+ 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 DS1817R-20-U+?

For technical support, including DS1817R-20-U+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1817R-20-U+ requirements.

6.How does Aetrix verify that DS1817R-20-U+ is sourced from the original manufacturer or authorized distributors?

All DS1817R-20-U+ 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 DS1817R-20-U+ meets industry standards.

7.What is the process for return or replacement of DS1817R-20-U+?

All DS1817R-20-U+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1817R-20-U+, 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 DS1817R-20-U+ part is unused and in its original packaging.

Return procedure for DS1817R-20-U+:

1.Submit a request within 90 days.

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

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