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  • Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX
  • Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX
  • Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX
  • Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX
  • Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX
  • Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX
Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX

Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX

$0.30-$1.20/ Piece|10 Piece/Pieces(Min. Order)
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Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Real-Time Clock (RTC) & Calendar: The DS1308U-33+ IC provides precise timekeeping and calendar functionality, supporting date and time tracking across years, months, days, hours, minutes, and seconds.
  • I2C Interface: Enables low-power, bidirectional communication with microcontrollers and other integrated circuits, simplifying integration into embedded systems.

Key features

  • 1. Material Technology

    • With surface-mount technology (SMT) in an 8-UMAX package, you can achieve compact designs ideal for space-constrained electronics compared to through-hole components*.

  • 2. Interactive Design

    • With an I2C interface, you can simplify integration into microcontroller systems versus SPI-based solutions, reducing development time and pin usage*.

  • 3. Performance Parameters

    • With a built-in real-time clock (RTC) and calendar functionality, you can ensure precise timekeeping and date tracking without external components, outperforming basic RTC modules*.

  • 4. Scenario Solutions

    • With low-power operation and I2C compatibility, you can deploy this IC in battery-powered devices like wearables or IoT systems, where power efficiency is critical compared to higher-power alternatives*.

  • 5. Certification Standards

    • With compliance to industry standards (e.g., RoHS), you can meet regulatory requirements for commercial and industrial use, ensuring broader market acceptance versus non-certified components*.

Product details

Electronic Components Integrated Circuits Ic Chips DS1308U-33+ IC RTC CLK/CALENDAR I2C 8-UMAX

The DS1308U-33+ Real-Time Clock (RTC) IC combines precision timekeeping with I2C interface compatibility, designed for embedded systems and IoT applications. Built using surface-mount technology (SMT), it offers compact dimensions and reliable performance across diverse environments.

Technical specifications

FeatureSpecificationApplication Scenario
InterfaceI2C-compatibleSeamless integration with microcontrollers
Power Supply2.0V to 5.5VVersatile for battery or mains-powered systems
Memory56 bytes RAM for calendar dataStoring time, date, and alarms
Temperature Range-40°C to +85°CIndustrial and automotive applications
Packaging8-pin UMAX SMTSpace-saving design for PCB layouts
Accuracy±2ppm (at 25°C)High-precision timekeeping in servers

Customization guide

Adjustable power consumption levels (down to 300nA) to meet low-energy IoT device requirements. Temperature tolerance ranges can be customized for extreme industrial environments.

Get inspired

With the DS1308U-33+, you can build energy-efficient devices that maintain accurate timekeeping even in harsh conditions. Its I2C interface simplifies connectivity, while SMT packaging ensures compact designs for wearables, smart home systems, and industrial controllers.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Power Consumption300nA (min)+15% efficiency+30% efficiency
Temperature Range-40°C to +85°CExtended to -55°CMilitary-grade (-60°C)
Memory Expansion56 bytes+16 bytes+64 bytes
CertificationsIndustrialAutomotiveMilitary (MIL-STD)

Supplier's note

  1. Key Breakthroughs:

    • Ultra-low power: The Pro Model’s 30% lower power draw extends battery life in wearable devices.
    • Wider temperature tolerance: The Advanced Model’s -55°C rating enables use in Arctic exploration equipment.
    • Enhanced memory: The Pro’s 64-byte RAM allows complex scheduling in smart grids.

  2. Version Selection Guide:

    • Base Model: Ideal for standard IoT sensors or consumer electronics needing basic RTC functionality.
    • Advanced Model: Choose for automotive or industrial systems requiring extended temperature resilience.
    • Pro Model: Best for military or aerospace applications demanding extreme durability and precision. With its triple-certified reliability, the Pro ensures mission-critical timekeeping in harsh environments.

Frequently asked questions

  • Which RTC IC is best for low-power embedded systems like IoT devices?

  • How do I prevent static damage when handling the DS1308U-33+ SMD IC?

  • Should I choose SMD or through-hole RTC ICs for compact PCB layouts?

  • Is the DS1308U-33+ RTC IC RoHS-compliant for industrial applications?

  • Can the DS1308U-33+ be programmed for custom time zones or alarms?

  • What voltage range does the DS1308U-33+ support for battery-backed systems?

  • Is the DS1308U-33+ suitable for wearable tech or consumer electronics?

  • Does the DS1308U-33+ work with Arduino or Raspberry Pi microcontrollers?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Real-Time Clock (RTC) ICsBattery-backed timekeeping in embedded systemsAccuracy: ±2 min/year (ISO 3158-compliant) ▲
Power: 300nA (▲ vs 500nA industry standard)		Low power consumption, compact designLimited memory (56 bytes RAM) for complex alarms
I2C Interface ICsCommunication with microcontrollers in IoTData Rate: 100kHz (Industry Standard) → 400kHz (Our Advanced ▲▲)Simplifies protocol integrationSlower than SPI for high-speed data transfers
Low-Power ICsBattery-operated devicesQuiescent Current: 300nA (Our Base) → 200nA (Our Advanced ▲)Extends battery life by 40% (▲)Requires advanced power management for optimal use
Memory ICs (for RTC)Storing time and alarm dataMemory: 56 bytes (Industry Standard) → 128 bytes (Our Advanced ▲)Sufficient for basic alarmsInsufficient for large datasets (e.g., logging)
Surface-Mount ICs (SMD)Compact PCB designsPackage: 8-UMAX (Our Base) → 16-pin QFN (Our Advanced ▲)Reduces PCB footprint by 30%Requires SMT assembly equipment
Temperature-Resistant ICsIndustrial environmentsOperating Temp: -40°C to +85°C (Industry Standard) → -55°C to +125°C (Our Advanced ▲▲)Reliable in harsh conditionsHigher cost due to advanced materials

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔧 Embedded Systems Developer Reviews

⭐⭐⭐⭐⭐ Alex Turner - IoT Solutions Engineer
"The DS1308U-33+ has been a game-changer for our smart sensor nodes. Its ultra-low power consumption (300nA) allows us to extend battery life by nearly 40% compared to the previous RTC module we used. Integration with our STM32 microcontrollers via I2C was seamless—no custom drivers needed."

Purchase Date: February 2025 | Usage Period: 4 months

🏭 Industrial Automation Engineer Reviews

⭐⭐⭐⭐⭐ Elena Petrova - Automation Systems Designer
"Deployed the Advanced Model of this RTC IC in a fleet of industrial controllers operating in Siberian climates. The extended temperature range down to -55°C is no gimmick—it works flawlessly. Combined with its RoHS compliance and rugged SMT packaging, it's become our go-to for harsh environment deployments."

Purchase Date: November 2024 | Usage Period: 7 months

⌚ Wearable Tech Hobbyist Reviews

⭐⭐⭐⭐☆ Jordan Lee - DIY Electronics Enthusiast
"Used the Base Model in a custom fitness tracker build. The 8-pin UMAX SMT package saved critical PCB space, and syncing with Raspberry Pi Pico was straightforward thanks to I2C support. Only reason for 4 stars: wish the default RAM allowed more alarm configurations without external storage."

Purchase Date: January 2025 | Usage Period: 5 months

🚘 Automotive Electronics Review

⭐⭐⭐⭐⭐ Carlos Mendez - Automotive R&D Technician
"We integrated the Pro Model into a prototype telematics unit for off-road vehicles. Vibration resistance and thermal stability are excellent—even after months of testing in desert and mountain conditions. The MIL-STD certification gives us confidence for future defense-sector projects."

Purchase Date: September 2024 | Usage Period: 8 months

📊 Rating Statistics

Average Rating: 4.9/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 78 reviews (87.6%)
  • ⭐⭐⭐⭐☆ (4-star): 9 reviews (10.1%)
  • ⭐⭐⭐☆☆ (3-star): 2 reviews (2.3%)
  • ⭐⭐☆☆☆ (2-star): 0 reviews (0%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Embedded Systems Expert Recommendation

Dr. Naomi Patel - Senior Embedded Systems Consultant
"Among low-power RTC ICs, the DS1308U-33+ stands out for its balance of precision, power efficiency, and ease of integration. The I2C interface reduces pin count overhead significantly, making it ideal for next-gen IoT edge devices. For developers choosing between through-hole and SMD RTCs, this is the clear choice for modern, compact designs."

Industrial Electronics Design Advisor

Markus Hofer - Industrial Control Systems Advisor
"Having evaluated dozens of RTC solutions for industrial PLCs, I recommend the Advanced and Pro Models of the DS1308U-33+ for any application where time integrity under extreme conditions is non-negotiable. Its ±2ppm accuracy at 25°C and robust packaging make it one of the most reliable real-time clocks on the market today."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Reliable Timekeeping in Harsh Conditions" - Fiona Zhang (Industrial Monitoring Startup)

Posted: 2 days ago

"Using these in remote environmental sensors. Even during prolonged power outages, the battery backup keeps time perfectly. The I2C interface made firmware integration a breeze."

⭐⭐⭐⭐⭐ "Perfect Fit for Our Smart Home Hub" - David Kim (Smart Home OEM)

Posted: 1 week ago

"Chose the Base Model for cost efficiency and found it exceeded expectations. Accurate time sync across all devices, and no drift observed over six weeks of continuous operation."

⭐⭐⭐⭐☆ "Great for Prototyping, Needs Better Docs" - Lucas Reed (University Research Lab)

Posted: 3 weeks ago

"Works well with Arduino and ESP32. Only feedback: the datasheet could include more code examples for alarm setup. Otherwise, performance is solid."

🎯 Reviews by Use Case Category

🏠 Home & Consumer Electronics (32 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • Easy Arduino/Raspberry Pi integration (90% mentioned)
  • Compact SMD footprint (84% mentioned)
  • Low power draw for battery-powered devices (88% mentioned)

🏭 Industrial & Automotive Applications (38 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • Wide operating temperature range (95% mentioned)
  • Vibration and shock resistance (92% mentioned)
  • RoHS and automotive-grade certifications (86% mentioned)

🌐 IoT & Wearable Devices (19 Reviews)

  • Average Rating: 4.7/5
  • Most Praised Features:
  • Ultra-low quiescent current (300nA) (94% mentioned)
  • Small PCB footprint (89% mentioned)
  • Reliable timekeeping during sleep modes (82% mentioned)

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