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

Analog Devices Inc./Maxim Integrated DS1816R-20-U+

Name: DS1816R-20-U+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1816R-20-U+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1816R-20-U+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

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

Datasheet:: DS1816R-20-U+.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

DS1816R-20-U+ from Maxim Integrated (now Analog Devices) is a 3.3V precision voltage-monitoring reset IC with open-drain active-low output, 20% V_CC trip tolerance, 150ms reset pulse width, and -40°C to +85°C operating range-used for reliable microprocessor power-fail detection and restart in embedded control systems.

For engineers reviewing the DS1816R-20-U+ datasheet, DS1816R-20-U+ pinout, DS1816R-20-U+ application, or DS1816R-20-U+ equivalent, key selection criteria include trip-point accuracy (2.47–2.64V), internal 5kΩ pull-up resistor, open-drain RST output drive capability, guaranteed reset hold time after power recovery, and SOT-23/TO-92 package compatibility.

Technical Context

The DS1816R-20-U+ integrates a temperature-compensated voltage reference and comparator to detect V_CC deviations beyond ±20% of nominal 3.3V. It asserts RST low on out-of-tolerance detection and holds it active for 100–250ms after V_CC returns to spec.

Its open-drain output supports wired-OR configurations and interfaces directly with microcontroller reset inputs requiring active-low assertion. Internal 5kΩ pull-up eliminates need for external resistor in many designs, while 28–35µA quiescent current enables low-power operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Trip Point	2.47V (min) to 2.64V (max); precise threshold for 3.3V systems with ±20% tolerance
Reset Pulse Width	100–250ms; ensures stable power and processor initialization before release
Output Type	Open-drain RST; enables shared reset bus and flexible voltage-level interfacing
Internal Pull-Up	3.5–7.5kΩ; reduces BOM count and PCB area vs. discrete resistor solution
Supply Current	28–35µA; supports always-on monitoring in battery-backed or low-power systems
Operating Temp	-40°C to +85°C; qualified for industrial and automotive under-hood environments

Pinout & Package

SOT-23 and TO-92 packages both provide identical 3-pin configuration: Pin 1 = RST (active-low open-drain output), Pin 2 = V_CC (power supply input), Pin 3 = GND (ground reference).

Pin/Terminal	Circuit Role	Design Meaning
1 (RST)	Active-low reset output	Drives microcontroller / FPGA / ASIC reset input low during fault or power-up; requires external pull-up only if load exceeds internal 5kΩ capability
2 (V_CC)	Power supply input	Monitored rail (1.2–5.5V); trip point set at 20% below nominal 3.3V; absolute max 7.0V
3 (GND)	Ground reference	Return path for internal reference and comparator; must be low-impedance connection to system ground plane

Key Features

Feature	Design Value
Precision voltage monitoring	±20% trip tolerance with temperature-compensated reference ensures consistent reset behavior across -40°C to +85°C
Guaranteed reset timing	150ms typical reset hold time after V_CC recovery prevents premature processor execution during power stabilization
Integrated pull-up resistor	5kΩ internal pull-up eliminates need for external component in standard microcontroller reset interface circuits
Low quiescent current	35µA max ICC enables continuous monitoring without significant impact on system standby power budget

Applications

Industrial PLC Controller	Smart Metering System
Use Scenario: Power interruption during firmware update or data logging causes brownout risk. IC Role / Device Role / Timing Role: Monitors 3.3V supply and asserts RST until stable; guarantees safe restart after grid fluctuation. Use Value: Prevents corrupted flash writes and inconsistent state by enforcing 150ms minimum reset hold time post-recovery.	Use Scenario: Battery-backed real-time clock and metrology IC require clean power sequencing during AC loss. IC Role / Device Role / Timing Role: Generates synchronized reset pulse to halt CPU and preserve SRAM contents during undervoltage event. Use Value: Enables deterministic power-fail response with 2.47–2.64V trip window optimized for 3.3V LDO-fed subsystems.
Automotive Body Control Module	IoT Edge Sensor Node
Use Scenario: Load-dump or cold-crank transients cause temporary V_CC sag below 2.64V in 12V-derived 3.3V rail. IC Role / Device Role / Timing Role: Detects undershoot and holds MCU in reset until regulated 3.3V stabilizes post-transient. Use Value: Avoids erratic CAN/LIN communication or EEPROM corruption due to marginal supply conditions.	Use Scenario: Coin-cell powered sensor node wakes periodically; must validate supply before ADC sampling. IC Role / Device Role / Timing Role: Provides early warning of battery depletion via 20% trip point on 3.3V boost converter output. Use Value: Extends usable battery life by enabling graceful shutdown before critical voltage collapse.

Industrial PLC Controller

Smart Metering System

Use Scenario: Power interruption during firmware update or data logging causes brownout risk.

IC Role / Device Role / Timing Role: Monitors 3.3V supply and asserts RST until stable; guarantees safe restart after grid fluctuation.

Use Value: Prevents corrupted flash writes and inconsistent state by enforcing 150ms minimum reset hold time post-recovery.

Use Scenario: Battery-backed real-time clock and metrology IC require clean power sequencing during AC loss.

IC Role / Device Role / Timing Role: Generates synchronized reset pulse to halt CPU and preserve SRAM contents during undervoltage event.

Use Value: Enables deterministic power-fail response with 2.47–2.64V trip window optimized for 3.3V LDO-fed subsystems.

Automotive Body Control Module

IoT Edge Sensor Node

Use Scenario: Load-dump or cold-crank transients cause temporary V_CC sag below 2.64V in 12V-derived 3.3V rail.

IC Role / Device Role / Timing Role: Detects undershoot and holds MCU in reset until regulated 3.3V stabilizes post-transient.

Use Value: Avoids erratic CAN/LIN communication or EEPROM corruption due to marginal supply conditions.

Use Scenario: Coin-cell powered sensor node wakes periodically; must validate supply before ADC sampling.

IC Role / Device Role / Timing Role: Provides early warning of battery depletion via 20% trip point on 3.3V boost converter output.

Use Value: Extends usable battery life by enabling graceful shutdown before critical voltage collapse.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD3+T	3.08V trip point (±1.5%), fixed 140ms reset timeout, no internal pull-up	Better accuracy but narrower tolerance; requires external pull-up resistor	Preferred when tighter trip-point stability is required and board space allows external resistor
TPS3808G18DBVR	1.8V trip point, adjustable delay (0–10s), 2.5µA IQ, no internal pull-up	Lower voltage rating and programmable timing; not drop-in for 3.3V systems	Selected for ultra-low-power 1.8V domains where DS1816R-20-U+ trip point is unsuitable

Compared with MAX809TRD3+T and TPS3808G18DBVR, the DS1816R-20-U+ offers integrated pull-up and ±20% trip tolerance optimized for cost-sensitive 3.3V microcontroller systems-reducing component count without sacrificing reliability in industrial-grade temperature ranges.

Availability

DS1816R-20-U+ is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering systems, automotive body control modules, and IoT edge sensor nodes requiring stable component supply and long-term production continuity.

Supply support for DS1816R-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

Analog Devices (via acquisition of Maxim Integrated) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, signal conditioning, and reliable system supervision.

The DS1816R-20-U+ belongs to Maxim's EconoReset™ family-engineered for cost-effective, single-supply voltage monitoring and reset generation in resource-constrained embedded systems.

FAQ

What is the exact V_CC trip voltage range for DS1816R-20-U+?

The DS1816R-20-U+ has a guaranteed V_CC trip point range of 2.47V (minimum) to 2.64V (maximum) at -40°C to +85°C, corresponding to ±20% tolerance around a nominal 3.3V supply. This range is specified in the DC Electrical Characteristics table and validated across temperature and process variation.

Does DS1816R-20-U+ require an external pull-up resistor on the RST pin?

No-DS1816R-20-U+ includes an internal 3.5–7.5kΩ pull-up resistor on the open-drain RST output. An external pull-up is only needed if the connected load demands more current than the internal resistor can source while maintaining valid logic-high voltage.

What is the reset pulse width specification for DS1816R-20-U+?

The DS1816R-20-U+ guarantees a reset pulse width (t_RST) of 100–250ms after V_CC returns to in-tolerance condition. The typical value is 150ms, ensuring sufficient time for power supply and microprocessor stabilization before reset release.

Can DS1816R-20-U+ operate with supply voltages below 3.3V?

Yes-DS1816R-20-U+ operates over V_CC = 1.2V to 5.5V per Recommended DC Operating Conditions. However, its 20%-tolerance trip point (2.47–2.64V) is calibrated for 3.3V systems; operation below 2.47V will assert reset continuously.

Is DS1816R-20-U+ pin-compatible with other DS1816 variants like DS1816R-10-U+?

Yes-DS1816R-20-U+, DS1816R-10-U+, and DS1816R-5-U+ share identical SOT-23 and TO-92 pinouts and electrical interface. Only the V_CC trip point differs: 20%, 10%, or 5% tolerance respectively-enabling direct substitution when trip-point requirements change.

DS1816R-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:: Tube

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 3.3V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 100ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

DS1816R-20-U+ FAQ

1.How can I place an order for DS1816R-20-U+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1816R-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 DS1816R-20-U+ reliable?

The price and inventory of DS1816R-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 DS1816R-20-U+ is usually 5 days.

3.What payment methods are accepted for DS1816R-20-U+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1816R-20-U+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1816R-20-U+?

DS1816R-20-U+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1816R-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 DS1816R-20-U+?

For technical support, including DS1816R-20-U+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1816R-20-U+ requirements.

6.How does Aetrix verify that DS1816R-20-U+ is sourced from the original manufacturer or authorized distributors?

All DS1816R-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 DS1816R-20-U+ meets industry standards.

7.What is the process for return or replacement of DS1816R-20-U+?

All DS1816R-20-U+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1816R-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 DS1816R-20-U+ part is unused and in its original packaging.

Return procedure for DS1816R-20-U+:

1.Submit a request within 90 days.

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

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