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Analog Devices Inc./Maxim Integrated DS1812R-5-U
- Part No.:
- DS1812R-5-U
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Unclassified
- Package:
- Datasheet:
-
DS1812R-5-U.pdf
- Description:
- IC ECONORESET 5V 5% P-P SOT-23-3
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS1812R-5-U from Maxim Integrated is a 5V precision voltage-monitoring reset IC with active-high push-pull output, 4.62V typical VCC trip point, 150ms reset pulse width, and -40°C to +85°C operation-used to automatically restart microprocessors after power failure in embedded control systems.
For engineers reviewing the DS1812R-5-U datasheet, DS1812R-5-U pinout, DS1812R-5-U application, or DS1812R-5-U equivalent, key selection criteria include reset threshold accuracy (±0.12V), guaranteed 100–300ms active-reset duration, push-pull drive capability (350µA VOH, 10mA IOL), and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The DS1812R-5-U integrates a temperature-compensated bandgap reference and comparator to detect VCC deviations beyond ±2.5% of 5V (4.50–4.75V trip range). It asserts RST immediately on undervoltage detection and holds it active for ≥100ms after VCC returns to tolerance.
Its CMOS push-pull output drives logic-level loads directly without external pull-up resistors. The internal timing circuit ensures consistent 150ms reset assertion during power-up and power-down transitions, independent of VCC slew rate within specified limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50V (min) to 4.75V (max); ensures reliable reset activation when 5V supply drops below 4.62V nominal |
| Reset Pulse Width | 100–300ms; guarantees sufficient stabilization time for microprocessor power-up sequencing |
| Output Type | Push-pull active-high; eliminates need for external pull-up resistor and supports direct TTL/CMOS interface |
| Supply Current | 30–40µA; enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Temp | -40°C to +85°C; validated for industrial-grade embedded controller environments |
| Output Drive | VOH = VCC–0.1V @ 350µA, IOL = 10mA @ 0.4V; supports robust interfacing with diverse logic families |
Pinout & Package
SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint and gull-wing leads; compatible with standard reflow profiles (260°C/10s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | Drives microcontroller RESET pin high during fault; no external pull-up required |
| 2 (VCC) | Power supply input | Accepts 1.2V–5.5V; internally monitors voltage against precision reference |
| 3 (GND) | Ground reference | Provides return path for internal comparator and output stage; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitoring | Temperature-compensated reference ensures ±0.12V trip accuracy over full operating temperature range |
| Guaranteed reset timing | 150ms nominal active-reset duration prevents premature processor release before power stabilization |
| Low quiescent current | 30–40µA ICC enables integration into always-on supervisory circuits without significant power penalty |
| Push-pull output architecture | Eliminates external components and reduces BOM count while improving noise immunity vs. open-drain alternatives |
Applications
| Industrial PLC Controller | Smart Metering Module |
|---|---|
Use Scenario: Power interruption during firmware update causes brownout risk in programmable logic controllers. IC Role / Device Role / Timing Role: DS1812R-5-U monitors 5V rail and forces hard reset if VCC falls below 4.62V, holding reset for 150ms post-recovery. Use Value: Prevents corrupted register states and ensures deterministic boot sequence after grid fluctuations. | Use Scenario: Utility meter operates continuously on backup capacitor during AC loss; requires clean restart upon power restoration. IC Role / Device Role / Timing Role: DS1812R-5-U provides active-high reset signal synchronized to 5V rail recovery with guaranteed 100–300ms hold time. Use Value: Eliminates need for discrete RC reset networks and improves long-term reliability under thermal cycling. |
| Embedded HVAC Controller | Point-of-Sale Terminal |
Use Scenario: HVAC microcontroller experiences intermittent 5V rail sag due to relay switching transients. IC Role / Device Role / Timing Role: DS1812R-5-U detects sub-4.50V excursions and asserts RST within 2–5µs, holding for 150ms. Use Value: Suppresses spurious resets caused by fast transients while ensuring valid reset during sustained undervoltage. | Use Scenario: POS terminal powers from shared 5V DC supply with printer and display; load changes induce voltage droop. IC Role / Device Role / Timing Role: DS1812R-5-U supervises main 5V rail and triggers controlled reboot only when droop exceeds 4.75V threshold. Use Value: Maintains transaction integrity by preventing partial execution during marginal power conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D | 3.08V fixed threshold, open-drain output, 200ms reset timeout | Requires external pull-up; suited for 3.3V systems with different timing requirements | Select when lower threshold and open-drain flexibility are needed in 3.3V designs |
| TPS3808G33DBVR | 3.3V threshold, push-pull output, adjustable delay (0.5–10s), higher ICC (12µA typ) | Programmable delay replaces fixed 150ms; optimized for low-voltage microcontrollers | Choose for designs requiring configurable reset timing and 3.3V rail supervision |
Compared with MAX6326US31D and TPS3808G33DBVR, the DS1812R-5-U offers fixed 4.62V trip and factory-trimmed 150ms reset hold-ideal for cost-sensitive 5V microcontroller systems where minimal BOM and guaranteed timing are critical.
Availability
DS1812R-5-U is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and embedded HVAC systems requiring stable component supply and long-term lifecycle support.
Supply support for DS1812R-5-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, automotive, and communications applications.
The DS1812R-5-U belongs to the EconoReset family-engineered for low-cost, high-reliability power-supply monitoring in resource-constrained microcontroller-based systems.
FAQ
What is the exact VCC trip voltage range for DS1812R-5-U?
The DS1812R-5-U has a guaranteed VCC trip point between 4.50V (minimum) and 4.75V (maximum), with 4.62V typical. This 5V-specific threshold is factory-trimmed and temperature-compensated to maintain ±0.12V accuracy across -40°C to +85°C operation, ensuring consistent reset behavior in industrial power rails.
Does DS1812R-5-U require an external pull-up resistor on the RST pin?
No, DS1812R-5-U features a push-pull active-high output that drives RST high directly without external components. Its VOH specification (VCC–0.1V at 350µA) confirms full logic-level compatibility with standard microcontroller reset inputs, eliminating BOM cost and layout complexity associated with pull-up resistors.
How long does DS1812R-5-U hold the reset signal active after VCC recovery?
The DS1812R-5-U holds RST active for 100–300ms after VCC returns to tolerance, with 150ms typical. This guaranteed minimum duration ensures microprocessors and peripheral circuits stabilize fully before release-critical for reliable boot sequencing in embedded systems subject to slow-rising or noisy power rails.
Can DS1812R-5-U operate from a 3.3V supply?
No, DS1812R-5-U is specifically designed for 5V systems and has a fixed 4.50–4.75V trip window. While its absolute maximum VCC rating extends to 5.5V and minimum operating voltage is 1.2V, the internal reference and comparator are calibrated for 5V rail supervision; using it on 3.3V would result in non-functional reset assertion.
What package options are available for DS1812R-5-U?
DS1812R-5-U is offered exclusively in the SOT-23-3 surface-mount package (1.3mm × 2.9mm), with gull-wing leads and JEDEC-standard footprint. This compact, reflow-compatible package supports high-density PCB layouts and automated assembly-no TO-92 variant is available for the "R" suffix version.
DS1812R-5-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
DS1812R-5-U FAQ
1.How can I place an order for DS1812R-5-U through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1812R-5-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 DS1812R-5-U reliable?
The price and inventory of DS1812R-5-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1812R-5-U is usually 5 days.
3.What payment methods are accepted for DS1812R-5-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812R-5-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1812R-5-U?
DS1812R-5-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1812R-5-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 DS1812R-5-U?
For technical support, including DS1812R-5-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812R-5-U requirements.
6.How does Aetrix verify that DS1812R-5-U is sourced from the original manufacturer or authorized distributors?
All DS1812R-5-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 DS1812R-5-U meets industry standards.
7.What is the process for return or replacement of DS1812R-5-U?
All DS1812R-5-U units undergo pre-shipment inspection (PSI). If there is an issue with DS1812R-5-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 DS1812R-5-U part is unused and in its original packaging.
Return procedure for DS1812R-5-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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