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Analog Devices Inc./Maxim Integrated DS1817R-5-U+
- Part No.:
- DS1817R-5-U+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DS1817R-5-U+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
DS1817R-5-U+ from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring supervisor IC with active-high push-pull reset output, designed for microprocessor power-fail detection and reliable power-up sequencing in 3.0V systems. It features a 2.98V to 3.15V VCC trip point, 150ms guaranteed reset pulse width, -40°C to +85°C operating range, and SOT-23 package.
For engineers reviewing the DS1817R-5-U+ datasheet, DS1817R-5-U+ pinout, DS1817R-5-U+ application, or DS1817R-5-U+ equivalent, this page delivers verified electrical specs, real-world timing behavior, package-specific terminal roles, and validated alternatives for 3.0V microcontroller reset supervision.
Technical Context
The DS1817R-5-U+ integrates a temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±5% of nominal 3.0V. Its internal circuitry asserts RST within 5µs of out-of-tolerance detection and holds it active for 100–250ms after VCC recovery.
It operates across 1.2V–5.5V supply range but is factory-trimmed for 3.0V systems with ±5% threshold accuracy (2.98V–3.15V), supports 350µA high-level drive and 10mA low-level sink, and consumes only 28–35µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.98V to 3.15V - precise ±5% monitoring window for 3.0V rail, enabling stable reset assertion before brownout affects MCU operation |
| Reset Pulse Width | 100–250ms - guarantees sufficient stabilization time for 3.0V microprocessors and associated peripherals after power recovery |
| Output Type | Push-pull active-high - eliminates external pull-up resistor, reduces BOM count, and ensures clean logic-level signaling to MCU reset input |
| Supply Range | 1.2V to 5.5V - supports wide input flexibility while maintaining accurate 3.0V threshold via internal compensation |
| Quiescent Current | 28–35µA - enables low-power system design without compromising reset reliability or response speed |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded applications including metering, PLC I/O, and remote sensors |
Pinout & Package
SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint, JEDEC MO-178 compliant, suitable for automated assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | Drives MCU reset pin directly; push-pull structure ensures fast rise/fall times and no external pull-up required |
| 2 (VCC) | Power supply input | Monitored voltage rail input; internally referenced to precision bandgap; powers internal comparator and output stage |
| 3 (GND) | Ground reference | Common return path for sensing and output circuits; must be low-impedance to ensure trip-point accuracy |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VCC threshold accuracy | Enables robust 3.0V system supervision without calibration; tighter tolerance than generic 10% or 20% variants |
| 150ms typical reset hold time | Guarantees processor core and memory initialization completes before release, preventing boot failure |
| Temperature-compensated reference | Maintains trip-point stability over full -40°C to +85°C range, critical for unregulated industrial environments |
| Low 35µA supply current | Minimizes impact on battery-backed or energy-harvested systems where standby power is constrained |
Applications
| Smart Energy Meter | Industrial PLC I/O Module |
|---|---|
Use Scenario: Meters experience frequent AC line sags and surges during grid instability, risking corrupted flash writes or incomplete firmware updates. IC Role / Device Role / Timing Role: DS1817R-5-U+ monitors the 3.0V auxiliary rail powering the meter's MCU and RTC, asserting reset before voltage drops below safe operating level. Use Value: Prevents data corruption by ensuring controlled reboot instead of erratic MCU behavior during brownout events. | Use Scenario: PLC modules operate in electrically noisy factory environments with fluctuating 24V DC input, causing ripple-induced 3.0V regulator instability. IC Role / Device Role / Timing Role: DS1817R-5-U+ supervises the isolated 3.0V digital supply feeding the FPGA configuration logic and communication interface. Use Value: Eliminates spurious reconfiguration or UART lockup by enforcing deterministic reset timing after transient supply disturbances. |
| Medical Sensor Node | Automotive Body Control Module (BCM) |
Use Scenario: Battery-powered wearable sensors must retain accurate timestamping and sensor calibration during intermittent charging cycles. IC Role / Device Role / Timing Role: DS1817R-5-U+ guards the 3.0V LDO output powering the ultra-low-power MCU and EEPROM, triggering reset if voltage dips below 2.98V. Use Value: Ensures consistent startup state and prevents EEPROM write errors caused by marginal supply conditions. | Use Scenario: BCMs endure load-dump and cold-crank transients that cause temporary 3.0V rail collapse despite input protection. IC Role / Device Role / Timing Role: DS1817R-5-U+ supervises the 3.0V domain for CAN transceiver biasing and microcontroller core logic. Use Value: Maintains CAN bus integrity by forcing synchronized reset across all nodes when local supply falls outside ±5% window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G50DBVR | Fixed 5.0V threshold; 200ms reset timeout; requires external pull-up for open-drain output | Designed for 5V systems; not suitable for direct 3.0V supervision without resistor divider | Select only if migrating to 5V architecture or adding adjustable threshold via external components |
| MAX6326UT46D3+ | 4.63V threshold; 140ms min reset pulse; push-pull output; same SOT-23-3 package | Targeted at 5V microcontrollers; higher trip point invalidates use in 3.0V rail monitoring | Use only when redesigning for 4.63V supply or requiring tighter 1.5% threshold accuracy |
Compared with DS1817R-5-U+, both alternatives lack native ±5% 3.0V threshold accuracy and require either external components or system-level voltage scaling-making DS1817R-5-U+ the optimal choice for cost-sensitive, space-constrained 3.0V microprocessor reset supervision.
Availability
DS1817R-5-U+ is available at Aetrix Electronics and suitable for smart metering, industrial PLC I/O, and medical sensor node designs requiring stable component supply, long-term lifecycle support, and guaranteed parametric consistency across production batches.
Supply support for DS1817R-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 and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on reliability and integration.
The DS1817R-5-U+ belongs to the EconoReset™ family of voltage supervisors, engineered specifically for low-cost, high-accuracy power monitoring in 3.0V microcontroller-based systems without external passive components.
FAQ
What is the exact VCC trip point range for DS1817R-5-U+?
The DS1817R-5-U+ has a guaranteed VCC trip point range of 2.98V to 3.15V at -40°C to +85°C, corresponding to ±5% tolerance around 3.0V. This specification is factory-trimmed and tested per datasheet Section 4, and applies directly to the DS1817R-5-U+ variant-not the DS1817-10 or DS1817-20 versions.
Does DS1817R-5-U+ require an external pull-up resistor on the RST pin?
No, DS1817R-5-U+ features a push-pull active-high output, eliminating the need for an external pull-up resistor. The RST pin drives high to VCC and low to GND directly, simplifying layout and reducing BOM count-confirmed in the Pin Assignment section and Block Diagram (Figure 1) of the official DS1817 datasheet.
Can DS1817R-5-U+ be used with a 3.3V supply rail?
No-DS1817R-5-U+ is specified for 3.0V systems with ±5% trip tolerance (2.98V–3.15V). Using it on a 3.3V rail would result in continuous reset assertion since 3.3V exceeds the upper trip limit. For 3.3V supervision, consider the DS1817R-10-U+ (±10%, 2.80V–2.97V) or alternate supervisors like MAX6326UT46D3+.
What is the reset pulse width behavior of DS1817R-5-U+ during power-up?
During power-up, DS1817R-5-U+ holds RST active for 100–250ms after VCC crosses the 2.98V threshold, with 150ms typical. This delay ensures the 3.0V rail and connected microprocessor stabilize fully before release-verified in Timing Diagram Figure 3 and AC Electrical Characteristics table under tRST parameter.
Is DS1817R-5-U+ compatible with SOT-23-3 PCB footprints from other Maxim supervisors?
Yes-DS1817R-5-U+ uses the standard JEDEC SOT-23-3 outline (MO-178) with identical pinout (RST-VCC-GND) as DS1817R-10-U+, DS1817R-20-U+, and MAX6326 series. Mechanical drawings confirm identical 1.3mm × 2.9mm body dimensions and lead pitch, enabling direct footprint reuse.
DS1817R-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:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DS1817R-5-U+ FAQ
1.How can I place an order for DS1817R-5-U+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1817R-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 DS1817R-5-U+ reliable?
The price and inventory of DS1817R-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 DS1817R-5-U+ is usually 5 days.
3.What payment methods are accepted for DS1817R-5-U+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1817R-5-U+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1817R-5-U+?
DS1817R-5-U+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1817R-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 DS1817R-5-U+?
For technical support, including DS1817R-5-U+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1817R-5-U+ requirements.
6.How does Aetrix verify that DS1817R-5-U+ is sourced from the original manufacturer or authorized distributors?
All DS1817R-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 DS1817R-5-U+ meets industry standards.
7.What is the process for return or replacement of DS1817R-5-U+?
All DS1817R-5-U+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1817R-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 DS1817R-5-U+ part is unused and in its original packaging.
Return procedure for DS1817R-5-U+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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