Q3103LC020002 SG-3040LC 32.768KHZ B Epson Timing Crystal or Oscillator (Other) In Stock
Epson Timing SG-3040LC is a simple packaged crystal oscillator (SPXO) operating at 32.768 kHz for real-time clock and low-power timer applications. Features a compact SMD package with CMOS output and low current consumption below 1 µA. Available from stock worldwide.
- Manufacturer
- Epson Timing
- Package
- Other
- Pin Count
- 12
- Lifecycle
- ACTIVE
- Category
- Crystal or Oscillator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 32.768 kHz SPXO with integrated oscillator circuit eliminating the need for external load capacitors required by bare crystal designs
- Ultra-low supply current below 1 µA in operating mode, enabling coin-cell battery life measured in years for wearables and IoT nodes
- CMOS-compatible output at 1.8 V to 3.3 V supply voltage drives microcontroller RTC clock inputs directly without level-shifting
- Compact SG-3040LC SMD package in a footprint smaller than 3.2 mm x 2.5 mm, suitable for miniaturized PCBs in portable and wearable devices
- Frequency stability rated in ppm class B, providing reliable timekeeping accuracy across commercial and industrial temperature ranges
Applications
The SG-3040LC 32.768 kHz SPXO is the standard reference oscillator for real-time clock (RTC) ICs and low-power microcontroller sleep-wake timers in smartwatches, fitness trackers, and IoT sensor nodes. Its integrated oscillator circuit simplifies PCB design by removing the two external load capacitors (typically 6 pF to 12.5 pF each) needed when using a bare 32.768 kHz crystal, reducing BOM component count and PCB area. The ultra-low supply current makes the SG-3040LC ideal for always-on timekeeping applications in industrial wireless sensors, medical monitors, and GPS trackers powered from 3 V coin cells.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What output frequency and logic level does the SG-3040LC oscillator provide for RTC applications?
The SG-3040LC outputs a precise 32.768 kHz square wave at CMOS logic levels compatible with 1.8 V to 3.3 V supply voltages, making it directly connectable to the XTAL or CLKIN pins of common RTC ICs such as the DS3231, PCF8563, and STM32 RTC peripherals. The 32.768 kHz frequency is the industry-standard timekeeping reference because it equals 2 to the 15th power Hz, allowing simple binary divider circuits to derive 1 Hz timekeeping pulses with zero division error across all second boundaries.
How does the SG-3040LC SPXO reduce BOM complexity compared to using a bare 32.768 kHz crystal?
A bare 32.768 kHz crystal requires two external load capacitors, typically 6 pF to 12.5 pF per the crystal datasheet specification, plus careful PCB layout to keep parasitic capacitance below 2 pF to avoid frequency pulling. The SG-3040LC integrates the oscillator circuit internally, eliminating both load capacitors and the associated layout constraints, reducing the BOM by 2 components and saving approximately 2 mm to 4 mm of PCB routing area in compact designs.
What supply current does the SG-3040LC consume, and how long can it run from a 3 V coin cell battery?
The SG-3040LC draws typically less than 1 µA of supply current during normal 32.768 kHz oscillation at 3 V. A standard CR2032 coin cell with 225 mAh capacity can theoretically supply 1 µA for 225,000 hours, or approximately 25 years, demonstrating that the oscillator current is negligible compared to the RTC IC current and the microcontroller sleep current, which are typically 0.5 µA to 5 µA in deep-sleep modes of modern microcontrollers.
Which SMD package does the SG-3040LC use, and how does the SG-3040 series compare in size to a TO-92 crystal oscillator for the same frequency?
The SG-3040LC uses a compact surface-mount package with footprint dimensions of approximately 3.2 mm x 2.5 mm and a height under 1 mm, which is more than 80% smaller in board area and 75% lower in height compared to a through-hole TO-92 packaged oscillator can measuring 5 mm x 5 mm x 9 mm. The SMD format is compatible with automated pick-and-place machines and reflow ovens, whereas TO-92 components require manual insertion or wave soldering, making the SG-3040LC the preferred choice for modern high-volume SMT production lines.
Can SG-3040LC 32.768 kHz B-class oscillator maintain timekeeping accuracy across both commercial and industrial temperature ranges?
The B-class frequency stability rating of the SG-3040LC defines a maximum frequency deviation measured in ppm from nominal across its rated temperature range, typically from -20°C to +70°C for commercial grade. At this stability level, the timekeeping error accumulates at a rate of a few seconds to tens of seconds per month depending on the actual temperature exposure profile, which meets the accuracy requirements of most calendar clocks and data loggers. For tighter accuracy below 5 ppm across the -40°C to +85°C industrial range, a temperature-compensated crystal oscillator (TCXO) at 32.768 kHz would be substituted.
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