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

Analog Devices Inc./Maxim Integrated DS1812-5

Name: DS1812-5
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1812-5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1812-5

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

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

Datasheet:: DS1812-5.pdf

Description:: IC SUPERVISOR 1 CHANNEL TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,535

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Product details

Overview

DS1812-5 from Maxim Integrated (now Analog Devices) is a 5V precision voltage supervisor IC with active-high push-pull reset output, V_CC trip point of 4.50–4.75 V, 150 ms reset timeout, and -40°C to +85°C operation - used to automatically restart microprocessors after power failure in embedded control systems.

For engineers reviewing the DS1812-5 datasheet, DS1812-5 pinout, DS1812-5 application, or DS1812-5 equivalent, key selection criteria include guaranteed reset assertion during V_CC undervoltage, precise trip threshold tolerance, push-pull output drive capability, and compatibility with TO-92 or SOT-23 PCB footprints.

Technical Context

The DS1812-5 integrates a temperature-compensated voltage reference and comparator to monitor V_CC against a fixed 4.62 V typical trip point. It asserts RST high when V_CC falls below the threshold and holds RST active for 100–300 ms after V_CC recovers, ensuring stable processor boot.

Its CMOS push-pull output delivers VOH ≥ V_CC – 0.1 V at 0–500 µA load and can sink up to 10 mA, eliminating external pull-up resistors. Operating current is only 30–40 µA across 1.2–5.5 V supply range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Trip Point	4.50–4.75 V - guarantees reset activation before 5 V system rail drops below safe microprocessor operating margin
Reset Timeout	100–300 ms - ensures sufficient stabilization time for power supply and CPU after V_CC recovery
Output Type	Push-pull active-high - drives RST directly without external pull-up, compatible with TTL/CMOS inputs
Supply Range	1.2–5.5 V - supports operation across wide input rails including battery-backed or low-voltage logic domains
Operating Temp	-40°C to +85°C - qualified for industrial-grade embedded environments without derating
I_CC	30–40 µA - enables ultra-low-power supervision in always-on monitoring circuits

Pinout & Package

DS1812-5 is available in TO-92 and SOT-23 packages. Both variants share identical pin assignment: Pin 1 = RST (active-high reset output), Pin 2 = V_CC (power supply input), Pin 3 = GND (ground reference).

Pin/Terminal	Circuit Role	Design Meaning
1 (RST)	Active-high push-pull output	Drives microprocessor RESET# input high during fault; no external pull-up required
2 (V_CC)	Power supply input	Monitored rail input; operates from 1.2 V to 5.5 V with internal reference independence
3 (GND)	Ground reference	Common return path for reference, comparator, and output stage; must be low-impedance

Key Features

Feature	Design Value
Precision voltage sensing	Temperature-compensated reference ensures ±1.5% trip accuracy over full -40°C to +85°C range
Guaranteed reset timing	150 ms nominal timeout prevents premature release before power and CPU stabilization
Low quiescent current	30–40 µA max ICC enables use in battery-critical or energy-harvesting supervisory paths
Push-pull output architecture	Eliminates need for external pull-up resistor and reduces BOM count in reset signal chains

Applications

Industrial PLC Controller	Smart Meter Power Management
Use Scenario: Power interruption detection during grid fluctuations causes transient brownouts in programmable logic controllers. IC Role / Device Role / Timing Role: DS1812-5 monitors 5 V system rail and asserts active-high reset to halt and reinitialize CPU upon undervoltage. Use Value: Prevents corrupted state execution by guaranteeing 150 ms minimum reset hold time after V_CC recovery.	Use Scenario: Battery-backed smart meters require reliable power-fail signaling to save metering data before shutdown. IC Role / Device Role / Timing Role: DS1812-5 detects V_CC drop below 4.62 V and triggers controlled firmware save sequence via RST signal. Use Value: Precision trip point ensures early warning before critical 5 V rail collapse, enabling deterministic data retention.
Embedded HVAC Controller	Point-of-Sale Terminal Boot Integrity
Use Scenario: HVAC microcontrollers experience unstable 5 V supply during relay switching or motor startup transients. IC Role / Device Role / Timing Role: DS1812-5 provides clean, glitch-free reset assertion independent of V_CC noise due to internal hysteresis and filtering. Use Value: Eliminates false resets caused by short-duration dips, improving system uptime and field reliability.	Use Scenario: POS terminals undergo frequent AC power cycling and require deterministic boot initialization. IC Role / Device Role / Timing Role: DS1812-5 holds RST high for 150 ms after 5 V rail reaches regulation, synchronizing CPU reset with stable power. Use Value: Ensures consistent boot behavior across power cycles, reducing firmware hang incidents in retail environments.

Industrial PLC Controller

Smart Meter Power Management

Use Scenario: Power interruption detection during grid fluctuations causes transient brownouts in programmable logic controllers.

IC Role / Device Role / Timing Role: DS1812-5 monitors 5 V system rail and asserts active-high reset to halt and reinitialize CPU upon undervoltage.

Use Value: Prevents corrupted state execution by guaranteeing 150 ms minimum reset hold time after V_CC recovery.

Use Scenario: Battery-backed smart meters require reliable power-fail signaling to save metering data before shutdown.

IC Role / Device Role / Timing Role: DS1812-5 detects V_CC drop below 4.62 V and triggers controlled firmware save sequence via RST signal.

Use Value: Precision trip point ensures early warning before critical 5 V rail collapse, enabling deterministic data retention.

Embedded HVAC Controller

Point-of-Sale Terminal Boot Integrity

Use Scenario: HVAC microcontrollers experience unstable 5 V supply during relay switching or motor startup transients.

IC Role / Device Role / Timing Role: DS1812-5 provides clean, glitch-free reset assertion independent of V_CC noise due to internal hysteresis and filtering.

Use Value: Eliminates false resets caused by short-duration dips, improving system uptime and field reliability.

Use Scenario: POS terminals undergo frequent AC power cycling and require deterministic boot initialization.

IC Role / Device Role / Timing Role: DS1812-5 holds RST high for 150 ms after 5 V rail reaches regulation, synchronizing CPU reset with stable power.

Use Value: Ensures consistent boot behavior across power cycles, reducing firmware hang incidents in retail environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G01DBVR	Adjustable trip point (via external resistor); 200 ms fixed timeout; open-drain output	Requires external pull-up and resistor network; better for multi-rail or custom threshold designs	Choose when flexible threshold tuning or multi-supply monitoring is needed
MAX6326UT46D3+	Fixed 4.63 V trip; 240 ms timeout; push-pull active-low output	Active-low reset polarity requires logic inversion or MCU pin reassignment	Choose when higher timeout margin and same trip accuracy are prioritized over output polarity

Compared with TPS3808G01DBVR and MAX6326UT46D3+, the DS1812-5 offers native active-high push-pull output and tighter trip tolerance (±1.5%) without external components - ideal for cost-sensitive, space-constrained 5 V microcontroller reset applications where polarity and simplicity are critical.

Availability

DS1812-5 is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter power management, and embedded HVAC systems requiring stable component supply and long-term lifecycle support.

Supply support for DS1812-5 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DS1812-5 belongs to Maxim's EconoReset™ family - engineered specifically for low-cost, high-reliability power supply monitoring in resource-constrained microprocessor systems.

FAQ

What is the exact V_CC trip point range for DS1812-5?

The DS1812-5 has a guaranteed V_CC trip point range of 4.50 V to 4.75 V, with a typical value of 4.62 V. This specification is tested and characterized across the full -40°C to +85°C operating temperature range and ensures reliable reset activation before 5 V system rails fall below safe microprocessor operating limits.

Does DS1812-5 require an external pull-up resistor on the RST pin?

No, DS1812-5 does not require an external pull-up resistor. Its RST pin features a push-pull active-high output capable of driving TTL/CMOS inputs directly. The output delivers VOH ≥ V_CC – 0.1 V at loads up to 500 µA, eliminating BOM overhead and layout complexity associated with open-drain supervisors.

How long is the reset pulse duration after V_CC returns to tolerance?

The DS1812-5 holds the RST output active for 100–300 ms after V_CC rises above the trip threshold, with a typical duration of 150 ms. This guaranteed timeout allows sufficient time for the power supply and microprocessor to stabilize before releasing reset, preventing erratic boot behavior.

Which packages are available for DS1812-5?

DS1812-5 is offered in both TO-92 and SOT-23 packages. Both share identical pinout: Pin 1 = RST, Pin 2 = V_CC, Pin 3 = GND. Mechanical drawings for each package are published in the official DS1812 datasheet and on Analog Devices' website under the "Mechanical Drawings" section.

What is the maximum supply voltage the DS1812-5 can tolerate?

The DS1812-5 has an absolute maximum V_CC rating of +7.0 V, but its recommended DC operating condition specifies a maximum supply voltage of 5.5 V. Operation beyond 5.5 V may compromise long-term reliability and is outside the characterized performance envelope defined in the datasheet.

DS1812-5 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:: 4.62V

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

DS1812-5 FAQ

1.How can I place an order for DS1812-5 through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1812-5 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 DS1812-5 reliable?

The price and inventory of DS1812-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1812-5 is usually 5 days.

3.What payment methods are accepted for DS1812-5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812-5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1812-5?

DS1812-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1812-5 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 DS1812-5?

For technical support, including DS1812-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812-5 requirements.

6.How does Aetrix verify that DS1812-5 is sourced from the original manufacturer or authorized distributors?

All DS1812-5 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 DS1812-5 meets industry standards.

7.What is the process for return or replacement of DS1812-5?

All DS1812-5 units undergo pre-shipment inspection (PSI). If there is an issue with DS1812-5, 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 DS1812-5 part is unused and in its original packaging.

Return procedure for DS1812-5:

1.Submit a request within 90 days.

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

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