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Home Products Crystals, Oscillators, Resonators Oscillators~~SIT8209AI-81-28S-156.257812X~~

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SIT8209AI-81-28S-156.257812X - SiTime

Name: SiTime SIT8209AI-81-28S-156.257812X
Brand: SiTime
SKU: SIT8209AI-81-28S-156.257812X
Price: 4.022 USD
Availability: InStock
Rating: 5 (8 reviews)

Manufacturer Part Number: SIT8209AI-81-28S-156.257812X

Manufacturer: SiTime

Allelco Part Number: 98D-SIT8209AI-81-28S-156.257812X

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 31,651 pcs available, New & Original

Parts Description: -40 TO 85C, 7050, 20PPM, 2.8V, 1

Package

Data sheet: SIT8209AI-81-28.pdf

Datasheets
SiT8209.pdf

RoHs Status: Lead free / RoHS Compliant

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In stock: 31651

Unit Price: $4.022
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Quantity	Unit Price	Ext. Price
1+	$4.022	$4.02

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Specifications

SIT8209AI-81-28S-156.257812X Tech Specifications
SiTime - SIT8209AI-81-28S-156.257812X technical specifications, attributes, parameters and parts with similar specifications to SiTime - SIT8209AI-81-28S-156.257812X

Product Attribute	Attribute Value
Manufacturer	SiTime
Series	*
Packaging	Tape & Reel (TR)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Product Attribute	Attribute Value
Manufacturer Standard Lead Time	5 Weeks
Lead Free Status / RoHS Status	Lead free / RoHS Compliant
Detailed Description	Oscillator

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	Lead free / RoHS Compliant

Frequently Asked Questions(FAQ)

How does the SIT8209AI-81-28S-156.257812X oscillator compare to traditional quartz-based solutions in terms of long-term frequency stability under industrial temperature cycling?: The SIT8209AI-81-28S-156.257812X achieves ±20ppm frequency stability over the full -40°C to +85°C operating range, which exceeds typical quartz oscillators that often degrade beyond ±30–50ppm when exposed to repeated thermal transients. Semiconductor-based MEMS timing devices like this SiTime part exhibit superior resistance to shock, vibration, and temperature-induced drift compared to crystal resonators, making them ideal for harsh environments where reliability is critical.

In high-speed digital systems requiring precise clocking, how does the 156.25781MHz output frequency of the SIT8209AI-81-28S-156.257812X support common data rates such as those used in Ethernet or PCIe applications?: The SIT8209AI-81-28S-156.257812X operates at exactly 156.25781MHz, which aligns closely with key reference frequencies in networking and communication protocols. For example, this frequency can generate standard 10/100/1000BASE-T Ethernet clocking via PLL multiplication, and it also serves as a viable source for generating 125MHz SERDES clocks when divided appropriately. Its precise fractional-N capability ensures minimal jitter and phase noise, essential for maintaining signal integrity in high-speed serial links.

What design considerations are necessary when integrating the SIT8209AI-81-28S-156.257812X into a PCB layout to minimize supply noise and maintain its specified ±20ppm stability?: To preserve the ±20ppm stability guaranteed by the SIT8209AI-81-28S-156.257812X, implement a robust power delivery network with a dedicated 2.8V LDO feeding the oscillator, located within 10mm of the IC. Place 10μF bulk decoupling capacitors and 0.1μF high-frequency ceramic caps directly at the VDD pins. Avoid routing sensitive clock traces near noisy digital lines, and use ground plane cutouts beneath the oscillator package to reduce capacitive coupling from switching currents.

Can the SIT8209AI-81-28S-156.257812X be reconfigured post-manufacturing to adjust frequency or output format, and what tools are typically required?: Yes, the SIT8209AI-81-28S-156.257812X supports in-system reprogramming via a serial interface (commonly I²C or SPI depending on firmware), allowing engineers to modify frequency, output type, and drive strength after deployment. This flexibility enables field updates without hardware changes—critical for system calibration or protocol adaptation. However, reprogramming requires access to SiTime’s configuration software and proper handling of write-protect mechanisms to avoid accidental corruption.

How does the LVCMOS/LVTTL compatibility of the SIT8209AI-81-28S-156.257812X impact interoperability with modern FPGAs and ASICs that may require different voltage thresholds?: The dual-output support for both LVCMOS and LVTTL allows the SIT8209AI-81-28S-156.257812X to interface seamlessly with a wide range of digital components. While LVCMOS (typically 1.8V or 2.5V) offers lower power and better noise margins than LVTTL (3.3V), selecting the correct mode depends on the receiver’s input characteristics. Mismatched thresholds between the oscillator output and destination logic can cause undefined states; thus, verifying VIH/VIL compliance with downstream devices is essential during board bring-up.

What are the implications of using the SIT8209AI-81-28S-156.257812X in a system requiring ultra-low jitter performance, given its 36mA supply current and ±20ppm stability specification?: Although the SIT8209AI-81-28S-156.257812X has a modest 36mA supply current, its MEMS-based architecture inherently delivers lower phase noise than many quartz alternatives—often <1ps RMS jitter at 156.25781MHz. Combined with programmable filtering, this makes it suitable for moderate-jitter-sensitive applications like switched networks or video encoding. However, for sub-picosecond jitter requirements (e.g., high-end test equipment), additional PLL-based clock conditioning may still be necessary despite the oscillator’s native low-noise profile.

How does the SIT8209AI-81-28S-156.257812X compare to fixed-frequency crystal oscillators in terms of total cost of ownership for mass-produced embedded systems?: While the SIT8209AI-81-28S-156.257812X may carry a higher unit cost than basic crystal oscillators, its programmability eliminates the need for multiple BOM parts, reduces inventory complexity, and enables over-the-air updates. Over large production volumes, these factors often offset the initial price premium. Additionally, reduced failure rates due to improved shock resistance lead to lower warranty claims and field returns, contributing to a favorable TCO profile in complex, distributed deployments.

What environmental testing standards should be considered when qualifying the SIT8209AI-81-28S-156.257812X for aerospace or military applications beyond its stated -40°C to +85°C range?: Although the SIT8209AI-81-28S-156.257812X is rated for industrial temperatures, full MIL-PRF-38535 qualification would require additional validation including extended temperature cycling (-55°C to +125°C), random vibration (20G RMS), and HAST (Highly Accelerated Stress Test) per JEDEC JESD22-A110. These tests assess solder joint integrity and parametric shifts under extreme conditions not covered by standard datasheet guarantees.

Can the SIT8209AI-81-28S-156.257812X operate reliably in automotive-grade environments where transient surges and electromagnetic interference are prevalent?: The SIT8209AI-81-28S-156.257812X is designed for industrial use but lacks AEC-Q100 certification. While its MEMS structure resists mechanical stress better than crystals, exposure to ESD events above ±4kV or voltage spikes exceeding the 2.8V supply rail could compromise functionality. Therefore, it should only be deployed in automotive subsystems with robust protection circuitry and derating unless formal qualification against ISO 16750-2 is performed.

What trade-offs exist between using the SIT8209AI-81-28S-156.257812X versus an off-the-shelf clock generator with integrated PLL when targeting low-power wireless sensor nodes?: The SIT8209AI-81-28S-156.257812X consumes 36mA at 2.8V—relatively high for battery-powered IoT devices—but offers simplicity and no external components. In contrast, integrated clock generators with built-in PLLs may draw less quiescent current while providing flexible frequency synthesis. For ultra-low-power designs, a dedicated low-current oscillator followed by an external PLL might yield better efficiency, though board space and bill-of-materials complexity increase accordingly.

Parts with Similar Specifications

The three parts on the right have similar specifications to SiTime SIT8209AI-81-28S-156.257812X

Product Attribute
Part Number	SIT8209AI-81-28S-156.257812T	SIT8209AI-81-28S-156.257812	SIT8209AI-81-28S-156.257812Y	SIT8209AI-81-28S-156.250000X
Manufacturer	SiTime	SiTime	SiTime	SiTime
Packaging	-	-	-	-
Moisture Sensitivity Level (MSL)	-	-	-	-
Detailed Description	-	-	-	-
Lead Free Status / RoHS Status	-	-	-	-
Series	-	-	-	-
Manufacturer Standard Lead Time	-	-	-	-

SIT8209AI-81-28S-156.257812X Datasheet PDF

Download SIT8209AI-81-28S-156.257812X pdf datasheets and SiTime documentation for SIT8209AI-81-28S-156.257812X - SiTime.

Datasheets: SiT8209.pdf

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Customer Reviews

Evaluation: 10 Articles

Embe***dMotion

Aug 5, 2026

Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.
FPGA***dio

Jul 30, 2026

This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.
Nord***mbedded

Jul 20, 2026

Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.
Arch***ct

Jul 15, 2026

Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.
FPGA***lorer88

Jul 7, 2026

The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.
Nath***oleman

Jun 29, 2026

Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.
Emil***rperTech

Jun 23, 2026

Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.
Liam***terTech

Jun 15, 2026

Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.
Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.

QC (Quality Warranty)
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.

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