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SIT3373AC-1E3-30NC540.000000 - SiTime

Manufacturer Part Number: SIT3373AC-1E3-30NC540.000000

Manufacturer: SiTime

Allelco Part Number: 98D-SIT3373AC-1E3-30NC540.000000

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 49,427 pcs available, New & Original

Parts Description: MEMS OSC VCXO 540.0000MHZ LVPECL

Package: 6-SMD, No Lead Exposed Pad

Data sheet: SIT3373AC-1E3-3.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

SIT3373AC-1E3-30NC540.000000 Tech Specifications
SiTime - SIT3373AC-1E3-30NC540.000000 technical specifications, attributes, parameters and parts with similar specifications to SiTime - SIT3373AC-1E3-30NC540.000000

Product Attribute	Attribute Value
Manufacturer	SiTime
Voltage - Supply	3V
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	LVPECL

Product Attribute	Attribute Value
Operating Temperature	-20°C ~ 70°C
Mounting Type	Surface Mount
Height - Seated (Max)	0.039" (1.00mm)
Function	-
Frequency Stability	±50ppm
Frequency	540 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 SIT3373AC-1E3-30NC540.000000 compare to traditional quartz-based oscillators in terms of frequency stability and long-term reliability for high-performance clock distribution applications?: The SIT3373AC-1E3-30NC540.000000 leverages SiTime’s Elite Platform MEMS resonator technology, which delivers ±50ppm frequency stability across its -20°C to 70°C operating range—significantly tighter than typical oven-controlled crystal oscillators (OCXOs) at lower power, though less stable than some high-end OCXOs. Unlike quartz oscillators, MEMS VCXOs exhibit superior resistance to shock, vibration, and mechanical stress due to their solid-state structure, reducing failure rates in rugged environments. Over time, MEMS oscillators demonstrate minimal aging effects compared to quartz, resulting in more predictable drift and reduced recalibration requirements in mission-critical systems such as telecommunications infrastructure or test equipment where clock integrity is paramount.

What are the key design considerations when integrating the SIT3373AC-1E3-30NC540.000000 into a 3.3V LVPECL clock tree, particularly regarding supply noise sensitivity and output termination?: When deploying the SIT3373AC-1E3-30NC540.000000 in a 3V LVPECL configuration, careful attention must be paid to supply decoupling due to the oscillator’s moderate power supply rejection ratio (PSRR). A low-impedance, distributed decoupling network using 0.1µF X7R capacitors placed within 5mm of the device pins helps mitigate high-frequency noise coupling. For LVPECL outputs, proper termination with a 50Ω resistor to VCC-2V (typically 1.3V for a 3.3V system) at the load end ensures signal integrity and minimizes reflections. The device’s differential architecture also requires symmetrical PCB layout to maintain common-mode voltage levels and prevent mode conversion, especially over longer traces in multi-board systems.

Can the SIT3373AC-1E3-30NC540.000000 operate reliably in industrial temperature ranges beyond its specified -20°C to 70°C without derating performance?: No, the SIT3373AC-1E3-30NC540.000000 is rated only from -20°C to 70°C. Operating outside this range risks degraded frequency stability, increased phase jitter, and potential functional failure. While some MEMS oscillators exhibit partial performance retention under transient thermal excursions, extrapolating operation beyond specification voids warranty and compromises system compliance. In applications requiring extended temperature operation—such as automotive or outdoor networking gear—alternative devices with broader industrial or military temperature grades should be evaluated instead.

How does the spread spectrum bandwidth feature impact the suitability of the SIT3373AC-1E3-30NC540.000000 for EMI-sensitive applications like RF front ends or high-speed serial links?: The SIT3373AC-1E3-30NC540.000000 lacks integrated spread spectrum modulation, meaning it emits spectral energy concentrated at its nominal 540 MHz output with no intentional spreading. This results in higher peak emissions at the fundamental frequency, potentially violating EMI regulations near sensitive bands such as those used by Wi-Fi, radar, or cellular radios. While external filtering or shielding may mitigate issues, designers targeting FCC, CE, or CISPR compliance in compact form factors should consider alternatives with programmable spread spectrum capability or lower-noise output stages to reduce radiated interference.

What trade-offs exist between using the SIT3373AC-1E3-30NC540.000000 versus a fixed-frequency LVPECL oscillator when implementing a tunable clock source for FPGA or processor synchronization?: The SIT3373AC-1E3-30NC540.000000 offers voltage-controlled tuning via an external varactor or DAC interface, enabling fine frequency adjustment (±50ppm absolute pull range not defined here, but typically limited to ~±100–200 ppm for MEMS VCXOs). However, this comes at the cost of increased complexity in control loop design and potential degradation in phase noise compared to fixed-frequency counterparts. If precise tuning isn’t required, a non-tunable LVPECL oscillator provides better jitter performance, simpler implementation, and lower BOM cost—making it preferable unless dynamic clock scaling is essential.

Is the SIT3373AC-1E3-30NC540.000000 suitable for use in systems requiring low additive jitter below 0.1 ps RMS, such as coherent optical transceivers?: Unlikely. While the SIT3373AC-1E3-30NC540.000000 offers respectable phase noise performance typical of MEMS VCXOs (e.g., −100 dBc/Hz at 1 kHz offset), its integrated jitter exceeds 0.1 ps RMS in most configurations. Coherent optics demand ultra-low jitter clocks (<0.05 ps) with exceptional long-term stability and low spurs. For such applications, dedicated clock multipliers with ultra-low-jitter reference sources or specialized timing ICs are recommended over general-purpose MEMS VCXOs like this one.

How does the Moisture Sensitivity Level (MSL) rating of 1 for the SIT3373AC-1E3-30NC540.000000 affect storage and assembly handling in high-volume manufacturing?: With an MSL rating of 1, the SIT3373AC-1E3-30NC540.000000 can withstand unlimited exposure to ambient humidity before baking is required prior to reflow soldering. This simplifies inventory management and enables just-in-time delivery without pre-conditioning steps. Manufacturers benefit from reduced handling protocols and lower risk of moisture-induced defects during assembly, making it ideal for high-throughput environments where lead-free reflow profiles (e.g., 260°C peak) are standard.

What is the impact of mounting the SIT3373AC-1E3-30NC540.000000 on a standard FR4 PCB versus a low-thermal-expansion laminate on frequency accuracy and package warpage?: Mounting the SIT3373AC-1E3-30NC540.000000 on standard FR4 introduces minor thermal stress during reflow, but MEMS resonators are inherently tolerant to mechanical deformation. However, repeated thermal cycling may exacerbate solder joint fatigue over time, especially if the PCB CTE mismatch is significant. Using a low-CTE material like Rogers RO4350B reduces warpage and enhances long-term reliability in dense assemblies. That said, for single-use or non-automotive designs within the specified temp range, FR4 suffices without measurable frequency deviation.

How does the absence of an exposed pad affect thermal dissipation and ESD protection strategies for the SIT3373AC-1E3-30NC540.000000?: Unlike many modern QFN packages, the SIT3373AC-1E3-30NC540.000000 uses a 6-SMD, no-lead exposed pad configuration that primarily serves as a ground reference rather than a heat spreader. Power dissipation is modest (~15 mW), so thermal concerns are minimal. However, grounding the exposed pad improves signal return path integrity and aids in electrostatic discharge (ESD) protection by providing a low-impedance path to chassis or plane. Designers should connect it to analog ground with a star point topology to avoid introducing digital noise into the oscillator circuit.

In what scenarios would the RoHS3 compliance of the SIT3373AC-1E3-30NC540.000000 provide tangible advantages over legacy halogenated materials in global electronics deployment?: RoHS3 compliance ensures the absence of restricted substances such as phthalates and additional flame retardants beyond standard RoHS limits, aligning with evolving EU directives and customer sustainability policies. This becomes critical in consumer electronics, medical devices, and aerospace subsystems where regulatory scrutiny is intense. While the direct functional impact on performance is negligible, RoHS3 status facilitates smoother market access and reduces audit overhead in supply chains prioritizing environmental responsibility.

How does the ECCN classification (EAR99) influence export controls and sourcing decisions involving the SIT3373AC-1E3-30NC540.000000?: Classified as EAR99, the SIT3373AC-1E3-30NC540.000000 falls under U.S. export jurisdiction but is generally unrestricted for commercial end-uses, including most civil communications and computing applications. This simplifies international procurement and distribution, avoiding the need for complex license evaluations associated with higher-risk categories like 3A001. However, users must still comply with local import regulations and ensure final product classification aligns with intended deployment geography.

What role does the 540 MHz output frequency play in compatibility with modern SerDes or PCIe clocking architectures?: The 540 MHz center frequency of the SIT3373AC-1E3-30NC540.000000 lies within the upper range of common SerDes reference clocks but is non-standard for PCIe Gen3/Gen4, which typically uses 100 MHz or fractional multiples via clock multipliers. Direct substitution without synthesis could violate protocol timing margins. While some high-speed PHYs support flexible reference inputs, verification against vendor-specific requirements is essential. In many cases, synthesizers or fanout buffers are needed to generate compliant clock trees from this base frequency.

How does the package size (7.00mm x 5.00mm) of the SIT3373AC-1E3-30NC540.000000 influence routing density and layer stackup planning in high-pin-count FPGA carrier boards?: At 7.00mm x 5.00mm, the SIT3373AC-1E3-30NC540.000000 occupies moderate board real estate but demands careful routing due to tight trace spacing and the need for controlled impedance for LVPECL signals. On densely populated boards, placing it away from noisy digital blocks minimizes crosstalk. Its height (1.00mm max) allows placement on both top and bottom layers, aiding signal escape routing. However, adjacent high-speed nets require guard traces or ground stitching vias to preserve signal integrity.

Can the SIT3373AC-1E3-30NC540.000000 replace a crystal oscillator in a legacy design without modifying the PCB layout or firmware assumptions?: Only if the original design already supports LVPECL output and 3V supply rails. The SIT3373AC-1E3-30NC540.000000 cannot directly substitute a CMOS or HCSL output type without level-shifting circuitry. Additionally, MEMS oscillators often have different startup characteristics and drive strength than crystals, which may affect load matching networks. Firmware relying on specific enable sequences or calibration routines tied to crystal behavior may also require modification. Substitution is feasible only when electrical and timing interfaces are compatible.

What factors determine whether the SIT3373AC-1E3-30NC540.000000 meets the needs of a phase-locked loop (PLL) input stage requiring low wander and holdover stability?: PLL performance hinges on the reference clock’s wander characteristics, which depend on the oscillator’s Allan deviation and frequency agility. The SIT3373AC-1E3-30NC540.000000 exhibits low wander due to MEMS stability but lacks holdover capability—it fails immediately upon loss of control voltage or supply. Thus, in systems requiring uninterrupted operation during transient faults (e.g., GPS-disciplined oscillators), this device alone is insufficient; auxiliary backup sources or hybrid architectures are necessary.

How does the lack of a defined Absolute Pull Range (APR) in the datasheet affect tuning resolution and linearity when using the SIT3373AC-1E3-30NC540.000000 for precision timing adjustments?: Without explicit APR specification, designers cannot accurately model the relationship between tuning voltage and frequency shift, leading to unpredictable resolution and potential nonlinearities. Typical MEMS VCXOs achieve ~10–20 Hz/V sensitivity, but empirical characterization is required. For applications demanding sub-kHz tuning granularity, such as atomic clock calibration or sensor synchronization, this ambiguity increases development risk and necessitates extensive bench testing before integration.

In comparison to other SiT3373 variants, what unique advantages does the SIT3373AC-1E3-30NC540.000000 offer for high-frequency LVPECL distribution in FPGA-based acceleration cards?: Relative to lower-frequency SiT3373 models, the 540 MHz output enables shorter clock cycles and potentially higher effective bandwidth for memory or interconnect interfaces. The AC variant specifically targets low-jitter, LVPECL-compatible timing in data center and HPC applications. Combined with SiTime’s Elite Platform reliability and small footprint, it reduces board-level complexity versus discrete oscillator solutions. However, it trades off tunability and holdover features found in higher-end SiT3373 series members optimized for telecom or instrumentation use.

What precautions should be taken when simulating the SIT3373AC-1E3-30NC540.000000 in SPICE or IBIS-Model environments to ensure accurate system-level predictions?: Accurate simulation requires validated IBIS or behavioral models that capture MEMS-specific dynamics such as startup settling time (~1 ms), phase noise profile, and supply current transients. Generic crystal models fail to represent these traits. Additionally, parasitics from PCB layout (trace inductance/capacitance) significantly affect LVPECL rise times and eye diagrams. Users must incorporate layout-aware parameters and verify against measured data to avoid misleading convergence or timing margin calculations in end-system simulations.

Parts with Similar Specifications

The three parts on the right have similar specifications to SiTime SIT3373AC-1E3-30NC540.000000

Product Attribute
Part Number	SIT3373AC-1E3-30NC500.000000	SIT3373AC-1E3-30NC614.000000	SIT3373AC-1E3-30NC625.000000	SIT3373AC-1E3-30NC432.000000
Manufacturer	SiTime	SiTime	SiTime	SiTime
Absolute Pull Range (APR)	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Output	-	-	-	-
Type	-	-	-	-
Base Resonator	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Size / Dimension	-	-	-	-
Height - Seated (Max)	-	-	-	-
Voltage - Supply	-	-	-	-
Spread Spectrum Bandwidth	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Frequency	-	-	-	-
Function	-	-	-	-
Series	-	-	-	-
Frequency Stability	-	-	-	-

SIT3373AC-1E3-30NC540.000000 Datasheet PDF

Download SIT3373AC-1E3-30NC540.000000 pdf datasheets and SiTime documentation for SIT3373AC-1E3-30NC540.000000 - 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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America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
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Asia	India	4
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Middle East	Israel	6

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1.00kg-2.00kg	USD$40.00 - USD$80.00
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