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SIT3373AI-4E9-28NC222.750000 - SiTime

Name: SiTime SIT3373AI-4E9-28NC222.750000
Brand: SiTime
SKU: SIT3373AI-4E9-28NC222.750000
Price: 8.765 USD
Availability: InStock
Rating: 5 (3 reviews)

Manufacturer Part Number: SIT3373AI-4E9-28NC222.750000

Manufacturer: SiTime

Allelco Part Number: 98D-SIT3373AI-4E9-28NC222.750000

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 39,583 pcs available, New & Original

Parts Description: MEMS OSC VCXO 222.7500MHZ HCSL

Package: 6-SMD, No Lead Exposed Pad

Data sheet: SIT3373AI-4E9-2.pdf

HTML Datasheet
SiT3373 Datasheet.pdf

Other Related Documents
Manufacturing Notes for SiTime Products.pdf

PCN Design/Specification
Mult Dev Material Chgs 26/Aug/2021.pdf

RoHs Status: ROHS3 Compliant

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Specifications

SIT3373AI-4E9-28NC222.750000 Tech Specifications
SiTime - SIT3373AI-4E9-28NC222.750000 technical specifications, attributes, parameters and parts with similar specifications to SiTime - SIT3373AI-4E9-28NC222.750000

Product Attribute	Attribute Value
Manufacturer	SiTime
Voltage - Supply	2.8V
Type	VCXO
Spread Spectrum Bandwidth	-
Size / Dimension	0.276" L x 0.197" W (7.00mm x 5.00mm)
Series	SiT3373, Elite Platform™
Package / Case	6-SMD, No Lead Exposed Pad
Package	Strip
Output	HCSL

Product Attribute	Attribute Value
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Height - Seated (Max)	0.039" (1.00mm)
Function	-
Frequency Stability	±35ppm
Frequency	222.75 MHz
Base Resonator	MEMS
Absolute Pull Range (APR)	-

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN	EAR99
HTSUS	8542.39.0001

Frequently Asked Questions(FAQ)

What are the key advantages of using the SIT3373AI-4E9-28NC222.750000 MEMS-based VCXO over traditional quartz-based oscillators in high-speed clock distribution applications?: The SIT3373AI-4E9-28NC222.750000 leverages SiTime’s MEMS resonator technology, which provides superior resilience to mechanical shock and vibration compared to quartz alternatives—critical in industrial or mobile environments where clock integrity is paramount. Its ±35 ppm frequency stability across the full -40°C to 85°C range ensures reliable performance under thermal cycling, while the integrated HCSL output directly supports high-speed interfaces like PCIe Gen3/Gen4 without requiring external termination components, reducing board complexity and signal integrity risks.

How does the 2.8V supply voltage of the SIT3373AI-4E9-28NC222.750000 influence power supply design and noise sensitivity in mixed-signal systems?: Operating at 2.8V allows the SIT3373AI-4E9-28NC222.750000 to integrate cleanly into low-voltage digital subsystems, minimizing headroom requirements and reducing overall power draw. However, this lower rail increases susceptibility to supply noise, so a low-noise LDO with adequate PSRR (>60 dB at 100 kHz) and localized decoupling (100 nF + 1 µF MLCCs within 2 mm of the VDD pin) are recommended to preserve phase noise performance, especially when driving multiple high-speed SERDES loads.

Can the SIT3373AI-4E9-28NC222.750000 be used in applications requiring spread spectrum clocking, and if not, what design alternatives should be considered?: The SIT3373AI-4E9-28NC222.750000 does not support spread spectrum modulation, as indicated by the absence of a specified bandwidth parameter. For EMI-sensitive designs such as displays or consumer electronics where regulatory compliance demands spectral spreading, consider SiTime’s SiT33xx series with SSC capability or implement board-level filtering and shielding. Alternatively, pair this device with a downstream clock buffer that includes programmable spread spectrum features.

What is the significance of the 6-SMD, no-lead exposed pad package in the SIT3373AI-4E9-28NC222.750000 for thermal and electrical performance?: The exposed thermal pad on the SIT3373AI-4E9-28NC222.750000 enhances heat dissipation from the internal MEMS and CMOS circuitry, maintaining junction temperature within safe limits even under sustained operation at 85°C ambient. Electrically, proper grounding of this pad (via multiple vias to a solid ground plane) reduces ground inductance and improves HCSL signal return path integrity, which is essential for minimizing jitter in multi-gigabit clock trees.

How does the ±35 ppm frequency stability specification of the SIT3373AI-4E9-28NC222.750000 translate into real-world timing margin for a 222.75 MHz reference clock?: At 222.75 MHz, ±35 ppm equates to a maximum frequency deviation of ±7.796 kHz. Over a 1-second measurement interval, this results in a timing error of approximately ±7.8 µs. In synchronous systems like Ethernet or CPRI, this level of stability is sufficient for short-reach interconnects but may require tighter control or synchronization protocols (e.g., IEEE 1588) in long-haul or phase-coherent applications where cumulative skew must be minimized.

What layout considerations are critical when routing the HCSL outputs from the SIT3373AI-4E9-28NC222.750000 to minimize jitter and ensure signal integrity?: The differential HCSL outputs of the SIT3373AI-4E9-28NC222.750000 should be routed as tightly coupled 100 Ω differential pairs with length matching within ±5 mils. Avoid vias if possible; if unavoidable, use symmetrical via placement and back-drilling to reduce stub effects. Maintain a continuous reference plane beneath the traces and keep them away from noisy digital lines or switching regulators to prevent coupled noise from degrading RMS jitter below the typical 0.5 ps specification.

How does the moisture sensitivity level (MSL 1) of the SIT3373AI-4E9-28NC222.750000 affect handling and assembly processes?: With MSL 1 classification, the SIT3373AI-4E9-28NC222.750000 has unlimited floor life under ambient conditions, eliminating the need for dry packing, bake cycles, or strict humidity-controlled storage. This simplifies logistics and reduces risk during high-volume SMT assembly, particularly in contract manufacturing environments where moisture-sensitive components require special handling protocols.

In what types of system architectures is the SIT3373AI-4E9-28NC222.750000 most effectively deployed as a primary reference oscillator?: The SIT3373AI-4E9-28NC222.750000 is well-suited for high-performance computing, wireless infrastructure, and test equipment where a stable, low-jitter 222.75 MHz reference is needed for FPGA-based transceivers, ADC/DAC sampling clocks, or SerDes blocks. Its HCSL output aligns with common PHY and switch IC requirements, enabling direct fan-out to multiple loads without additional level translation, provided proper termination and trace impedance control are maintained.

How does the pull range capability of the SIT3373AI-4E9-28NC222.750000 compare to other VCXOs in the SiT3373 series, and what implications does this have for synchronization applications?: While the absolute pull range (APR) is not explicitly stated for the SIT3373AI-4E9-28NC222.750000, typical SiT3373 variants offer APR up to ±1600 ppm, enabling fine frequency tuning via the control voltage pin. This allows the device to lock to external references in synchronous Ethernet or SONET systems. Designers should consult the full datasheet or contact SiTime for exact APR values, as insufficient pull range could limit use in holdover or wander compensation scenarios.

What are the trade-offs between selecting the SIT3373AI-4E9-28NC222.750000 versus a fixed-frequency oscillator when designing a flexible clocking architecture?: Choosing the SIT3373AI-4E9-28NC222.750000 introduces voltage-controlled tunability, enabling dynamic frequency adjustment for system calibration or synchronization—advantages over fixed-frequency oscillators. However, this comes with added complexity in the control loop design (e.g., filter network for the VC pin) and potential introduction of modulation-induced phase noise. For applications where frequency agility isn’t required, a fixed-frequency MEMS oscillator may offer lower cost and simpler integration.

How does the 7.00 mm × 5.00 mm footprint of the SIT3373AI-4E9-28NC222.750000 impact high-density PCB designs, and what placement guidelines should be followed?: The compact 0201-sized package of the SIT3373AI-4E9-28NC222.750000 supports dense layouts common in blade servers or optical modules. Place the device as close as possible to the clock input of the downstream IC to minimize trace length and parasitic capacitance. Ensure the exposed pad is soldered to a grounded copper pour with at least four thermal vias to maintain thermal and electrical performance, and avoid placing high-speed signal traces beneath the package to prevent crosstalk.

What verification steps should be taken during prototype testing to confirm the SIT3373AI-4E9-28NC222.750000 meets system-level jitter requirements?: During validation, measure period jitter, cycle-to-cycle jitter, and long-term RMS jitter using a high-bandwidth oscilloscope (>8 GHz) with a low-noise probe setup. Compare results against the target application’s jitter budget—for example, PCIe Gen4 typically requires <1 ps RMS. Also verify startup time (<5 ms) and frequency accuracy under supply voltage variation (±5%) and temperature extremes, ensuring the SIT3373AI-4E9-28NC222.750000 remains within ±35 ppm across all conditions.

Parts with Similar Specifications

The three parts on the right have similar specifications to SiTime SIT3373AI-4E9-28NC222.750000

Product Attribute
Part Number	SIT3373AI-4E9-28NC280.550000	SIT3373AI-4E9-28NC245.760000	SIT3373AI-4E9-28NC223.000000	SIT3373AI-4E9-28NC224.000000
Manufacturer	SiTime	SiTime	SiTime	SiTime
Voltage - Supply	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Series	-	-	-	-
Absolute Pull Range (APR)	-	-	-	-
Output	-	-	-	-
Frequency	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Spread Spectrum Bandwidth	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Base Resonator	-	-	-	-
Function	-	-	-	-
Size / Dimension	-	-	-	-
Frequency Stability	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Height - Seated (Max)	-	-	-	-
Type	-	-	-	-

SIT3373AI-4E9-28NC222.750000 Datasheet PDF

Download SIT3373AI-4E9-28NC222.750000 pdf datasheets and SiTime documentation for SIT3373AI-4E9-28NC222.750000 - SiTime.

HTML Datasheet: SiT3373 Datasheet.pdf
Other Related Documents: Manufacturing Notes for SiTime Products.pdf
PCN Design/Specification: Mult Dev Material Chgs 26/Aug/2021.pdf

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Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.
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Jul 15, 2026

Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.
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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.
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Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.
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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

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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.
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