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Analog Devices Inc./Maxim Integrated DS1816R-5-U+
- Part No.:
- DS1816R-5-U+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DS1816R-5-U+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,531
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Product details
Overview
DS1816R-5-U+ from Maxim Integrated (now Analog Devices) is a precision 3.0V ±5% supply voltage supervisor IC with open-drain active-low reset output, 150ms 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 DS1816R-5-U+ datasheet, DS1816R-5-U+ pinout, DS1816R-5-U+ application, or DS1816R-5-U+ equivalent, key selection criteria include VCC trip point accuracy (2.98V–3.15V), guaranteed 100–250ms reset pulse width, internal 5kΩ pull-up resistor, SOT-23-3 package compatibility, and support for 3V/3.3V system monitoring without external components.
Technical Context
The DS1816R-5-U+ integrates a temperature-compensated bandgap voltage reference and comparator to detect VCC deviations beyond ±5% of nominal 3.0V. It asserts RST low on out-of-tolerance detection and holds it active for ≥100ms (typ. 150ms) after VCC recovery.
Its open-drain RST output supports wired-OR configurations and interfaces directly with microcontroller reset inputs. The internal 5kΩ pull-up eliminates need for external resistor in many applications, while ICC remains ≤35µA across full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.98V–3.15V (±5% at 3.0V nominal); ensures reliable reset assertion before brownout affects 3.3V logic |
| Reset Pulse Width | 100–250ms (typ. 150ms); provides sufficient stabilization time for microprocessor power-up sequence |
| Supply Voltage Range | 0V–5.5V; supports operation across 1.2V–5.5V VCC while monitoring only 3.0V ±5% |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded environments |
| Output Type | Open-drain RST with internal 3.5–7.5kΩ pull-up; enables direct interface to multiple MCU reset pins |
| Quiescent Current | 28–35µA; enables low-power always-on supervision in battery-backed or energy-constrained systems |
Pinout & Package
SOT-23-3 surface-mount package (3.0mm × 1.7mm × 1.3mm), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low open-drain reset output | Drives low during power fault or startup; requires external pull-up only if load exceeds internal 5kΩ capability |
| 2 (VCC) | Power supply input | Supplies internal circuitry; monitors voltage level relative to ±5% 3.0V threshold |
| 3 (GND) | Ground reference | Provides return path for reference and comparator circuits; must be low-impedance for accurate sensing |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VCC trip accuracy | Guarantees reset activation before 3.3V systems enter undefined logic states during brownout |
| 150ms minimum reset hold time | Meets JEDEC JESD78 requirement for microprocessor reset deassertion timing stability |
| Internal 5kΩ pull-up resistor | Eliminates discrete component count in standard 3.3V MCU reset circuits |
| Temperature-compensated reference | Maintains trip point stability over -40°C to +85°C without calibration or trimming |
| Low 35µA supply current | Enables continuous supervision in always-on subsystems without impacting system power budget |
Applications
| Industrial PLC Controller | Smart Metering Module |
|---|---|
Use Scenario: Power interruption during firmware update or data logging causes volatile state corruption. IC Role / Device Role / Timing Role: DS1816R-5-U+ monitors 3.3V rail and forces controlled processor reset before corrupted execution resumes. Use Value: Prevents flash memory write errors and register misconfiguration by enforcing 150ms post-recovery stabilization window. | Use Scenario: Mains voltage sag triggers undervoltage in isolated 3.3V auxiliary supply powering metrology SoC. IC Role / Device Role / Timing Role: DS1816R-5-U+ detects <2.98V condition and asserts RST to halt ADC sampling and EEPROM writes. Use Value: Avoids invalid energy measurement records and preserves EEPROM endurance by blocking unsafe write cycles. |
| Medical Diagnostic Sensor Node | Automotive Body Control Module |
Use Scenario: Battery voltage dip during cold cranking drops 3.3V LDO output below safe logic margin. IC Role / Device Role / Timing Role: DS1816R-5-U+ holds microcontroller in reset until 3.3V rail recovers and stabilizes for ≥150ms. Use Value: Ensures sensor fusion algorithms restart from known state, eliminating transient-induced false alarms. | Use Scenario: Load dump or alternator ripple causes brief 3.3V rail excursion in infotainment power domain. IC Role / Device Role / Timing Role: DS1816R-5-U+ provides deterministic reset timing independent of MCU internal POR circuitry. Use Value: Guarantees consistent boot sequence across vehicle battery conditions without firmware workarounds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G01DBVR | Fixed 3.0V ±1% trip point; 200ms programmable reset delay; higher accuracy but no internal pull-up | Requires external pull-up; better suited for high-reliability systems needing tighter tolerance | Select when ±1% trip accuracy and adjustable timeout outweigh added BOM cost and layout complexity |
| MAX6326UT31D3+ | 3.08V ±2.5% trip; push-pull output; no internal pull-up; 140ms min reset time | Push-pull eliminates need for external pull-up but lacks wired-OR capability | Prefer when driving single MCU reset pin without bus sharing and where 3.08V threshold aligns with system margin |
Compared with TPS3808G01DBVR and MAX6326UT31D3+, the DS1816R-5-U+ offers integrated pull-up and ±5% tolerance optimized for cost-sensitive 3.3V systems, while trading absolute accuracy for reduced component count and simpler layout.
Availability
DS1816R-5-U+ is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, medical sensor nodes, and automotive body control units requiring stable component supply and long-term production continuity.
Supply support for DS1816R-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
Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications infrastructure.
The DS1816R-5-U+ belongs to Maxim's EconoReset™ family-engineered for low-cost, high-reliability power supply monitoring in resource-constrained embedded systems without sacrificing timing or accuracy guarantees.
FAQ
What is the exact VCC trip voltage range for DS1816R-5-U+?
The DS1816R-5-U+ has a guaranteed VCC trip point of 2.98V to 3.15V at 25°C, corresponding to ±5% tolerance around a nominal 3.0V threshold. This range is maintained across the full -40°C to +85°C operating temperature range due to internal temperature compensation. The DS1816R-5-U+ uses this precise window to trigger reset before 3.3V logic becomes unreliable.
Does DS1816R-5-U+ require an external pull-up resistor on the RST pin?
No, DS1816R-5-U+ includes an internal pull-up resistor of 3.5–7.5kΩ, enabling direct connection to most 3.3V microcontroller reset inputs without external components. An external pull-up may be needed only in cases where load capacitance exceeds 10pF or sink current exceeds 10mA-conditions uncommon in standard MCU reset circuits using DS1816R-5-U+.
How long does DS1816R-5-U+ hold the RST signal active after VCC recovery?
DS1816R-5-U+ holds RST active for 100–250ms after VCC returns to within its ±5% trip window, with typical duration of 150ms. This fixed timeout ensures adequate stabilization time for both the 3.3V power rail and connected microprocessor clock domains before release. The DS1816R-5-U+ implements this via internal RC timing-no external capacitor required.
Can DS1816R-5-U+ be used in 3V-only systems?
Yes, DS1816R-5-U+ is specifically designed for 3.0V ±5% monitoring and operates reliably with VCC as low as 1.2V, making it compatible with 3V systems including those using 3.0V or 3.3V LDOs. Its trip point (2.98V–3.15V) aligns with 3.3V rail tolerances, and its -40°C to +85°C rating supports industrial 3V applications. DS1816R-5-U+ does not require VCC to equal the monitored voltage.
What package options are available for DS1816R-5-U+?
DS1816R-5-U+ is supplied exclusively in the SOT-23-3 package (3.0mm × 1.7mm × 1.3mm), marked "U+" per Maxim's packaging nomenclature. While the DS1816 family also includes TO-92 variants, the DS1816R-5-U+ suffix denotes the SOT-23-3 version. This compact surface-mount package supports automated assembly and high-density PCB layouts without compromising thermal or electrical performance.
DS1816R-5-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-5-U+ FAQ
1.How can I place an order for DS1816R-5-U+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1816R-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 DS1816R-5-U+ reliable?
The price and inventory of DS1816R-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 DS1816R-5-U+ is usually 5 days.
3.What payment methods are accepted for DS1816R-5-U+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1816R-5-U+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1816R-5-U+?
DS1816R-5-U+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1816R-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 DS1816R-5-U+?
For technical support, including DS1816R-5-U+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1816R-5-U+ requirements.
6.How does Aetrix verify that DS1816R-5-U+ is sourced from the original manufacturer or authorized distributors?
All DS1816R-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 DS1816R-5-U+ meets industry standards.
7.What is the process for return or replacement of DS1816R-5-U+?
All DS1816R-5-U+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1816R-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 DS1816R-5-U+ part is unused and in its original packaging.
Return procedure for DS1816R-5-U+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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