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

Analog Devices Inc./Maxim Integrated DS1817-20

Name: DS1817-20
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1817-20
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1817-20

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: DS1817-20.pdf

Description:: IC SUPERVISOR 1 CHANNEL TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,409

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Product details

Overview

DS1817-20 from Maxim Integrated (formerly Dallas Semiconductor) is a precision voltage-monitoring reset IC with 20% V_CC trip point tolerance, designed for reliable power-on reset and brown-out detection in 3.0V systems. It delivers active-high push-pull RST output, guarantees 150ms minimum reset pulse width after V_CC recovery, and operates across –40°C to +85°C.

For engineers reviewing the DS1817-20 datasheet, DS1817-20 pinout, DS1817-20 application, or DS1817-20 equivalent, key selection criteria include its 2.47V–2.64V trip window, 100–250ms reset assertion time, push-pull output drive capability, and dual TO-92/SOT-23 package support for legacy through-hole and space-constrained PCBs.

Technical Context

The DS1817-20 integrates a temperature-compensated bandgap reference and comparator to detect V_CC deviations against its factory-trimmed 20% threshold. Its internal timing circuit ensures RST remains asserted ≥100ms (typ. 150ms) after V_CC re-enters tolerance, independent of supply slew rate.

No external components are required: the device combines voltage sensing, timing control, and buffered active-high reset generation in a single monolithic CMOS IC. Output drive strength supports 350µA high-level sourcing and 10mA low-level sinking at V_CC = 2.7V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Trip Point	2.47V (min) to 2.64V (max); precise detection window for 3.0V nominal systems with 20% tolerance margin
Reset Pulse Width	100–250ms; ensures stable microprocessor initialization after power recovery
Output Type	Push-pull active-high; eliminates need for external pull-up resistor in most MCU interfaces
Supply Range	0.0V to 5.5V; supports operation down to near-zero V_CC during brown-out
Operating Temp	–40°C to +85°C; validated for industrial-grade embedded control environments
I_CC (Quiescent)	28–35µA; ultra-low standby current preserves battery life in always-on monitoring circuits

Pinout & Package

DS1817-20 is available in both TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Both share identical pin mapping and functional assignment.

Pin/Terminal	Circuit Role	Design Meaning
1 (TO-92) / 1 (SOT-23)	RST	Active-high reset output; drives microcontroller / processor reset input directly
2 (TO-92) / 2 (SOT-23)	V_CC	Power supply input; monitored voltage source; no external decoupling required
3 (TO-92) / 3 (SOT-23)	GND	Ground reference for internal comparator and output stage; must be low-impedance

Key Features

Feature	Design Value
20% V_CC trip tolerance	Enables robust brown-out detection in cost-sensitive 3.0V systems where tighter regulation is impractical
150ms guaranteed reset hold time	Meets JEDEC JESD78 reliability requirements for microprocessor power-up sequencing
Push-pull output stage	Eliminates external pull-up resistor, reducing BOM count and PCB footprint in reset signal paths
Temperature-compensated reference	Maintains trip point accuracy across –40°C to +85°C without calibration or trimming components
Low quiescent current (28–35µA)	Supports long-term battery-backed monitoring in energy-constrained IoT edge nodes

Applications

Industrial PLC I/O Module	Smart Meter Power Monitoring
Use Scenario: Continuous mains-powered operation with transient grid sags and surges. IC Role / Device Role / Timing Role: Voltage supervisor generating system-wide reset on brown-out events below 2.47V. Use Value: Prevents firmware corruption by holding microcontroller in reset until V_CC stabilizes above 2.64V for ≥150ms.	Use Scenario: Battery-assisted utility meter operating on 3.0V rail with backup supercapacitor. IC Role / Device Role / Timing Role: Primary brown-out detector triggering safe shutdown and nonvolatile state save. Use Value: 20% trip tolerance accommodates wide V_CC variation during capacitor discharge while maintaining deterministic reset timing.
Embedded HVAC Controller	Point-of-Sale Terminal Power Sequencing
Use Scenario: Fan-cooled controller exposed to ambient temperatures from –25°C to +70°C. IC Role / Device Role / Timing Role: Temperature-stable reset generator ensuring reliable boot after cold start or thermal cycling. Use Value: Internal compensation maintains ±1.5% trip point drift over full –40°C to +85°C range, avoiding false resets.	Use Scenario: Retail terminal with multi-rail power (3.3V logic, 5V peripherals) and fast turn-on requirement. IC Role / Device Role / Timing Role: Single-rail reset coordinator asserting reset only after 3.3V rail reaches valid level and holds for 150ms. Use Value: Push-pull output drives multiple downstream reset inputs simultaneously without signal degradation.

Industrial PLC I/O Module

Smart Meter Power Monitoring

Use Scenario: Continuous mains-powered operation with transient grid sags and surges.

IC Role / Device Role / Timing Role: Voltage supervisor generating system-wide reset on brown-out events below 2.47V.

Use Value: Prevents firmware corruption by holding microcontroller in reset until V_CC stabilizes above 2.64V for ≥150ms.

Use Scenario: Battery-assisted utility meter operating on 3.0V rail with backup supercapacitor.

IC Role / Device Role / Timing Role: Primary brown-out detector triggering safe shutdown and nonvolatile state save.

Use Value: 20% trip tolerance accommodates wide V_CC variation during capacitor discharge while maintaining deterministic reset timing.

Embedded HVAC Controller

Point-of-Sale Terminal Power Sequencing

Use Scenario: Fan-cooled controller exposed to ambient temperatures from –25°C to +70°C.

IC Role / Device Role / Timing Role: Temperature-stable reset generator ensuring reliable boot after cold start or thermal cycling.

Use Value: Internal compensation maintains ±1.5% trip point drift over full –40°C to +85°C range, avoiding false resets.

Use Scenario: Retail terminal with multi-rail power (3.3V logic, 5V peripherals) and fast turn-on requirement.

IC Role / Device Role / Timing Role: Single-rail reset coordinator asserting reset only after 3.3V rail reaches valid level and holds for 150ms.

Use Value: Push-pull output drives multiple downstream reset inputs simultaneously without signal degradation.

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	2.63V fixed trip point (±1.5%), 140ms min reset pulse, SOT-23 only	Higher trip accuracy but narrower tolerance; requires tighter 3.3V regulation	Select when system V_CC stability exceeds ±2% and board space favors SOT-23-only fit
TPS3808G18	1.8V adjustable trip via external resistor divider; 200ms default delay; open-drain output	Requires external components for trip setting; needs pull-up for active-high logic	Choose when flexible trip voltage or programmable delay is required, accepting added BOM complexity

Compared with MAX6326–26D and TPS3808G18, the DS1817-20 provides factory-trimmed 20% tolerance optimized for unregulated 3.0V rails, eliminates external components, and offers direct TO-92 compatibility-making it ideal for cost-driven, high-volume industrial controls where absolute trip precision is secondary to robustness and simplicity.

Availability

DS1817-20 is available at Aetrix Electronics and suitable for industrial automation, smart metering, embedded HVAC, and point-of-sale terminals requiring stable component supply across extended product lifecycles.

Supply support for DS1817-20 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 and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on reliability and integration.

The DS1817-20 belongs to the EconoReset™ family of supervisory circuits, engineered specifically for low-cost, high-reliability power monitoring in resource-constrained embedded systems without external timing or reference components.

FAQ

What is the exact V_CC trip point range for DS1817-20?

The DS1817-20 has a factory-trimmed V_CC trip point ranging from 2.47V (minimum) to 2.64V (maximum) at 25°C, corresponding to a 20% tolerance centered on a nominal 3.0V supply. This range is specified across the full operating temperature range (–40°C to +85°C) and accounts for initial tolerance plus temperature drift.

Does DS1817-20 require an external pull-up resistor on the RST pin?

No. The DS1817-20 features a push-pull active-high output stage capable of sourcing up to 350µA and sinking up to 10mA. This eliminates the need for an external pull-up resistor, simplifying design and reducing component count compared to open-drain reset supervisors.

Can DS1817-20 be used with a 3.3V supply?

Yes - the DS1817-20 operates over V_CC = 0.0V to 5.5V and is fully compatible with 3.3V systems. However, its 20% trip point (2.47V–2.64V) is optimized for 3.0V nominal rails; using it on 3.3V may result in early reset assertion before actual brown-out occurs in some designs.

What is the guaranteed minimum reset pulse width for DS1817-20 after V_CC recovery?

The DS1817-20 guarantees a minimum reset pulse width of 100ms, with a typical value of 150ms and maximum of 250ms after V_CC returns to within its trip window. This timing is internally generated and independent of V_CC slew rate or external capacitance.

Which packages are available for DS1817-20?

The DS1817-20 is offered in both TO-92 (3-pin through-hole) and SOT-23 (3-pin surface-mount) packages. Pin assignments are identical across both variants: Pin 1 = RST, Pin 2 = V_CC, Pin 3 = GND. Mechanical drawings are available on the manufacturer's website.

DS1817-20 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: EconoReset

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

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 (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

DS1817-20 FAQ

1.How can I place an order for DS1817-20 through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1817-20 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 DS1817-20 reliable?

The price and inventory of DS1817-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1817-20 is usually 5 days.

3.What payment methods are accepted for DS1817-20?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1817-20 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1817-20?

DS1817-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1817-20 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 DS1817-20?

For technical support, including DS1817-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1817-20 requirements.

6.How does Aetrix verify that DS1817-20 is sourced from the original manufacturer or authorized distributors?

All DS1817-20 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 DS1817-20 meets industry standards.

7.What is the process for return or replacement of DS1817-20?

All DS1817-20 units undergo pre-shipment inspection (PSI). If there is an issue with DS1817-20, 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 DS1817-20 part is unused and in its original packaging.

Return procedure for DS1817-20:

1.Submit a request within 90 days.

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

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