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SIT3373AI-4E9-28NC280.550000 - SiTime

Name: SiTime SIT3373AI-4E9-28NC280.550000
Brand: SiTime
SKU: SIT3373AI-4E9-28NC280.550000
Price: 8.765 USD
Availability: InStock
Rating: 5 (8 reviews)

Manufacturer Part Number: SIT3373AI-4E9-28NC280.550000

Manufacturer: SiTime

Allelco Part Number: 98D-SIT3373AI-4E9-28NC280.550000

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 41,484 pcs available, New & Original

Parts Description: MEMS OSC VCXO 280.5500MHZ 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-4E9-28NC280.550000 Tech Specifications
SiTime - SIT3373AI-4E9-28NC280.550000 technical specifications, attributes, parameters and parts with similar specifications to SiTime - SIT3373AI-4E9-28NC280.550000

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	280.55 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)

How does the frequency stability of the SIT3373AI-4E9-28NC280.550000 compare to traditional quartz-based oscillators in high-reliability applications?: The SIT3373AI-4E9-28NC280.550000 achieves ±35ppm frequency stability across its operating temperature range of -40°C to 85°C, which exceeds typical performance expectations for many commercial-grade quartz oscillators that often degrade beyond ±50ppm under similar conditions. This level of precision reduces clock jitter and improves timing margin in high-speed serial links such as PCIe Gen3 or SATA interfaces. When evaluating long-term drift and thermal sensitivity, MEMS technology inherently offers better immunity to shock and vibration compared to crystal resonators, making this device particularly suitable for embedded systems where environmental stress is a concern.

What are the key trade-offs when selecting the SIT3373AI-4E9-28NC280.550000 over an alternative VCXO with integrated spread spectrum modulation?: While the SIT3373AI-4E9-28NC280.550000 provides excellent phase noise and low jitter at 280.55MHz, it lacks built-in spread spectrum capability, which means it cannot comply with EMI-sensitive standards like those requiring FCC Part 15 compliance without additional filtering or system-level mitigation. In contrast, oscillators with spread spectrum reduce conducted emissions by modulating the clock frequency, but at the cost of increased complexity and potential timing uncertainty during transient conditions. For applications prioritizing signal integrity over emission control—such as point-to-point backplane communication—the absence of spread spectrum may be acceptable given the superior phase noise performance of the SiT3373 series.

Can the SIT3373AI-4E9-28NC280.550000 be used in systems requiring precise frequency tuning via voltage control?: Yes, the SIT3373AI-4E9-28NC280.550000 is a voltage-controlled crystal oscillator (VCXO) capable of fine-tuning its output frequency through an external analog control voltage applied to the dedicated tuning pin. The effective pull range depends on the specific model variant and is typically specified in the datasheet as a percentage of the nominal frequency. For instance, a ±10ppm tuning range would allow adjustments of approximately ±28kHz around 280.55MHz, enabling compensation for system-level calibration or environmental drift without replacing hardware components.

How does the power supply requirement of 2.8V impact integration into legacy 3.3V digital logic environments?: Operating at 2.8V allows the SIT3373AI-4E9-28NC280.550000 to interface directly with modern low-voltage CMOS devices while still being compatible with some 3.3V systems using level-shifting techniques. However, direct connection from a standard 3.3V rail without regulation risks exceeding the maximum supply voltage tolerance unless buffered appropriately. Designers should ensure stable voltage delivery within ±5% tolerance to maintain frequency stability and prevent parametric degradation over time, especially during startup transients.

What considerations apply when mounting the SIT3373AI-4E9-28NC280.550000 in a high-density PCB layout?: The 6-SMD, no-lead package with exposed pad requires careful attention to thermal and electrical grounding. The exposed pad must be soldered to a dedicated ground plane to ensure proper heat dissipation and minimize electromagnetic coupling. Layout practices should include short traces between the oscillator and the load, controlled impedance routing for the HCSL output, and isolation from noisy digital signals to preserve phase noise performance. Additionally, due to its small size (7.00mm x 5.00mm), spacing constraints may necessitate careful placement relative to adjacent high-speed components to avoid crosstalk.

Is the SIT3373AI-4E9-28NC280.550000 suitable for industrial automation systems operating near temperature extremes?: The device supports operation from -40°C to 85°C, aligning with industrial temperature grades commonly required in factory automation, transportation, and outdoor infrastructure. Its MEMS-based resonator exhibits minimal aging and superior thermal hysteresis compared to quartz crystals, reducing recalibration needs in long-lived deployments. Nevertheless, system designers must account for PCB material thermal expansion and solder joint reliability when integrating this oscillator into harsh environments, ensuring mechanical compatibility beyond just electrical specifications.

How does the Moisture Sensitivity Level (MSL) classification of 1 affect handling during assembly?: With an MSL rating of 1, the SIT3373AI-4E9-28NC280.550000 is not sensitive to moisture absorption and can be stored indefinitely under normal conditions without special packaging. This simplifies inventory management and assembly scheduling in high-volume production environments. It also eliminates the need for baking prior to reflow soldering, reducing processing steps and associated costs—critical advantages in automated manufacturing lines where throughput and yield are paramount.

What role does the HCSL output format play in high-speed data transmission architectures?: HCSL (High-Speed Current Steering Logic) is optimized for low-skew, differential signaling in high-speed serial protocols such as PCIe and USB 3.0. The SIT3373AI-4E9-28NC280.550000 delivers clean differential transitions with low jitter, enabling reliable data capture at multi-gigabit rates. Compared to LVDS or LVPECL outputs, HCSL typically consumes less power and generates lower electromagnetic interference, though it requires precise termination and impedance matching on the receiver side for optimal performance.

Are there any known limitations regarding start-up time when powering up circuits using the SIT3373AI-4E9-28NC280.550000?: The SiT3373 series features fast start-up characteristics typical of MEMS oscillators, generally stabilizing within 1ms under nominal conditions. However, actual start-up time can vary based on load capacitance, supply ramp slope, and ambient temperature. In systems requiring deterministic boot sequences, such as those with strict initialization timelines, designers should verify timing margins by reviewing application notes or performing empirical testing under worst-case scenarios, including cold starts at -40°C.

How does the choice between strip packaging versus tape-and-reel impact procurement and automated assembly?: The SIT3373AI-4E9-28NC280.550000 is available in strip form, which suits prototyping and low-volume development phases where manual handling is feasible. For mass production, converting to tape-and-reel enables compatibility with pick-and-place machinery, improving throughput and minimizing handling damage. Suppliers often offer both formats, so specifying the correct packing method during order placement ensures alignment with downstream manufacturing processes and reduces logistical overhead.

What precautions should be taken to ensure long-term reliability when deploying the SIT3373AI-4E9-28NC280.550000 in mission-critical applications?: Beyond adhering to recommended soldering profiles and avoiding mechanical stress during board handling, system architects should consider accelerated life testing and derating practices. Although MEMS devices exhibit lower aging rates than crystals—often less than 1ppm/year—consistent monitoring of frequency drift over operational life remains prudent. Additionally, avoiding rapid thermal cycling and maintaining clean power delivery help preserve performance integrity, particularly in aerospace or medical equipment where failure modes carry significant risk.

Does the absence of an absolute pull range specification indicate limitations in tunability?: The omission of an explicitly stated Absolute Pull Range (APR) in the public datasheet does not necessarily imply poor tunability; rather, it reflects SiTime’s focus on delivering pre-calibrated devices optimized for fixed-frequency applications. Users seeking tunable solutions should consult application-specific models within the SiT3373 family that provide detailed APR values, ensuring alignment with their frequency adjustment requirements before final selection.

How does the RoHS3 compliance status influence global market access and regulatory adherence?: Compliance with RoHS3 (EU Directive 2015/869) ensures the SIT3373AI-4E9-28NC280.550000 contains restricted substances within legal thresholds, facilitating entry into regulated markets such as the European Union, Japan, and South Korea. This certification reduces compliance burden for OEMs assembling finished goods destined for international distribution and avoids potential delays or rejections during customs clearance or product certification audits.

What alternatives exist if a design requires a lower center frequency but comparable jitter performance?: For applications needing reduced clock frequencies while maintaining low phase noise, alternative members of the SiT3373 family offer various center frequencies derived from the same Elite Platform™ architecture. These variants share similar electrical characteristics, including comparable jitter specs and HCSL output support, allowing engineers to select a part number closer to their target frequency without redesigning the entire timing subsystem. Cross-referencing the SiTime product selector tool helps identify suitable substitutes with minimal qualification effort.

Can the SIT3373AI-4E9-28NC280.550000 operate reliably in environments with high levels of mechanical vibration?: Yes, MEMS oscillators like the SIT3373AI-4E9-28NC280.550000 are inherently more resilient to vibration and shock than traditional quartz crystals due to their solid-state construction. This makes them ideal for automotive, defense, and industrial applications where mechanical disturbances are common. Unlike crystals, which can experience frequency shifts or mode hopping under sustained vibration, MEMS devices maintain stable oscillation across a wide dynamic range, enhancing system robustness in demanding physical environments.

How should the height constraint of 1.00mm influence enclosure design in compact embedded systems?: At only 1.00mm tall, the SIT3373AI-4E9-28NC280.550000 enables slim-profile designs critical for space-constrained applications such as handheld test equipment or IoT gateways. This low profile minimizes vertical stack-up challenges and facilitates double-sided SMT assembly. However, designers must still accommodate solder fillets and possible component warpage during reflow, ensuring adequate clearance above nearby connectors or tall passive components to prevent tombstoning or bridging defects.

What impact might supply voltage fluctuations have on the frequency output of the SIT3373AI-4E9-28NC280.550000?: Although the device is designed for stable operation at 2.8V, significant deviations in supply voltage can indirectly affect frequency stability through internal bias currents and reference node variations. While MEMS oscillators generally exhibit better PSRR (Power Supply Rejection Ratio) than crystals, transient dips or spikes above 3.0V risk damaging the IC. Therefore, incorporating local decoupling capacitors and linear regulators near the oscillator improves immunity to power rail noise, preserving timing accuracy in noisy power environments.

Is reverse engineering or cloning of the SIT3373AI-4E9-28NC280.550000 feasible given its firmware-like configuration?: The SIT3373AI-4E9-28NC280.550000 uses a digitally controlled MEMS resonator where frequency settings are stored in non-volatile memory accessible only through proprietary interfaces. While the core timing engine is implemented in firmware, full reverse engineering would require specialized tools and deep semiconductor expertise, and even then, replicating the exact performance profile—including calibrated trim values—is highly challenging. This adds a layer of intellectual property protection for original equipment manufacturers relying on this device in secure or differentiated products.

Parts with Similar Specifications

The three parts on the right have similar specifications to SiTime SIT3373AI-4E9-28NC280.550000

Product Attribute
Part Number	SIT3373AI-4E9-28NC222.750000	SIT3373AI-4E9-28NC250.000000	SIT3373AI-4E9-28NC270.000000	SIT3373AI-4E9-28NC240.000000
Manufacturer	SiTime	SiTime	SiTime	SiTime
Size / Dimension	-	-	-	-
Base Resonator	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Voltage - Supply	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Output	-	-	-	-
Function	-	-	-	-
Type	-	-	-	-
Frequency	-	-	-	-
Height - Seated (Max)	-	-	-	-
Frequency Stability	-	-	-	-
Series	-	-	-	-
Absolute Pull Range (APR)	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Spread Spectrum Bandwidth	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C

SIT3373AI-4E9-28NC280.550000 Datasheet PDF

Download SIT3373AI-4E9-28NC280.550000 pdf datasheets and SiTime documentation for SIT3373AI-4E9-28NC280.550000 - 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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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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