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Home Products Crystals, Oscillators, Resonators Oscillators~~SIT9120AC-1B3-25E133.333333G~~

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SIT9120AC-1B3-25E133.333333G - SiTime

Manufacturer Part Number: SIT9120AC-1B3-25E133.333333G

Manufacturer: SiTime

Allelco Part Number: 98D-SIT9120AC-1B3-25E133.333333G

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 35,753 pcs available, New & Original

Parts Description: -20 TO 70C, 3225, 50PPM, 2.5V, 1

Package: 6-SMD, No Lead

Data sheet: SIT9120AC-1B3-2.pdf

Datasheets
SiT9120 Datasheet.pdf

RoHs Status: Lead free / RoHS Compliant

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In stock: 35753

Unit Price: $2.636
Subtotal: $0.00

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Quantity	Unit Price	Ext. Price
1+	$2.636	$2.64

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Specifications

SIT9120AC-1B3-25E133.333333G Tech Specifications
SiTime - SIT9120AC-1B3-25E133.333333G technical specifications, attributes, parameters and parts with similar specifications to SiTime - SIT9120AC-1B3-25E133.333333G

Product Attribute	Attribute Value
Manufacturer	SiTime
Size / Dimension	0.126" L x 0.098" W (3.20mm x 2.50mm)
Series	*
Packaging	Tape & Reel (TR)
Package / Case	6-SMD, No Lead
Other Names	1473-2970-2 SIT9120AC-1B3-25E133.333333G-ND

Product Attribute	Attribute Value
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Manufacturer Standard Lead Time	5 Weeks
Lead Free Status / RoHS Status	Lead free / RoHS Compliant
Height - Seated (Max)	0.032" (0.80mm)
Detailed Description	Oscillator 6-SMD, No Lead

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	Lead free / RoHS Compliant

Frequently Asked Questions(FAQ)

How does the frequency stability of the SIT9120AC-1B3-25E133.333333G compare to standard crystal oscillators in temperature-varying industrial environments, and what design implications does this have for clock distribution reliability?: The SIT9120AC-1B3-25E133.333333G offers ±50ppm frequency stability across its full operating range from -20°C to +70°C, which is significantly tighter than traditional fundamental-mode crystal oscillators that typically exhibit ±100ppm or more under similar thermal conditions. This improved stability reduces accumulated timing drift in multi-stage clock trees, particularly beneficial in systems requiring precise synchronization such as PCIe or DDR memory interfaces. For a 133.33333MHz signal, this equates to only 6.666μs of phase error over one second, versus potentially 13.3μs with conventional crystals. Designers can therefore reduce margining overhead and simplify PLL loop filter design when using this oscillator.

What are the power consumption characteristics of the SIT9120AC-1B3-25E133.333333G compared to competing LVPECL oscillators at similar frequencies, and how might this impact system-level thermal management?: With a supply current of 69mA at 2.5V, the SIT9120AC-1B3-25E133.333333G consumes approximately 172mW of dynamic power—higher than some CMOS-based alternatives but comparable to other LVPECL devices in the 130–140MHz range. However, unlike discrete crystal solutions that require additional driver ICs consuming 20–30mW each, this integrated solution eliminates auxiliary components, resulting in net lower total power for equivalent performance. In high-channel-count applications like network switches or FPGA backplanes, this consolidation reduces board-level heat sources and simplifies thermal modeling by eliminating multiple hotspots associated with discrete implementations.

Can the SIT9120AC-1B3-25E133.333333G be reprogrammed after deployment to adjust frequency without hardware changes, and what are the practical limitations of post-manufacturing tuning?: Yes, the SIT9120AC-1B3-25E133.333333G supports in-field frequency reprogramming via I²C interface, enabling adjustments within its specified range while maintaining LVPECL output and 2.5V operation. However, each reconfiguration must respect the ±50ppm stability window; attempting to tune beyond this tolerance compromises system timing integrity. Additionally, frequent reprogramming may degrade long-term reliability due to EEPROM write cycles (typically rated for >1M writes), making it suitable primarily for calibration rather than continuous adjustment. This flexibility is valuable during bring-up phases but should not replace robust initial component selection.

How does the SMD3225-6P package footprint of the SIT9120AC-1B3-25E133.333333G affect PCB routing complexity compared to larger SMD packages, and what layout considerations are critical for maintaining signal integrity?: The compact SMD3225-6P footprint occupies just 3.2mm × 2.5mm, allowing dense placement in space-constrained designs such as high-speed SerDes modules. However, this small size increases routing density demands—LVPECL differential pairs require careful impedance control (typically 50Ω single-ended) with tightly matched trace lengths (<50mil delta-L). Ground plane proximity is essential to minimize loop inductance, and vias near output pins must be avoided to prevent ground bounce. Compared to 5x5mm QFN oscillators, this device reduces board real estate by ~60% but necessitates higher precision layout practices to maintain jitter performance below 100fs RMS.

What is the maximum allowable load capacitance for the SIT9120AC-1B3-25E133.333333G when driving LVPECL inputs, and how does improper matching affect phase noise?: While internal load matching is factory-calibrated, external termination resistors (typically 49.9Ω to VCC/2) dominate effective load conditions. Deviations greater than ±5% from recommended values increase return loss and cause signal reflection, degrading eye diagrams in serialized links. Phase noise at 10kHz offset degrades approximately 0.5dB per 1% mismatch due to reduced slew-rate linearity. For consistent performance across all units, designers should use laser-trimmed resistors with <1% tolerance and minimize stub lengths on differential paths exceeding 200mil.

Is the SIT9120AC-1B3-25E133.333333G suitable for automotive-grade applications requiring AEC-Q100 qualification, and what environmental testing parameters must be verified?: Although SiTime markets this part for commercial temperatures (-20°C to +70°C), automotive systems often require extended temperature ranges (-40°C to +105°C) and rigorous qualification per AEC-Q100 Grade 2. The SIT9120AC-1B3-25E133.333333G itself is not pre-qualified for automotive use; engineers must verify compliance through supplemental stress tests including thermal cycling (-40/+125°C), humidity exposure (85°C/85% RH), and mechanical shock (50G). If used in safety-critical contexts, additional derating (e.g., reducing max frequency by 10%) may be necessary to ensure margin against long-term drift.

How does jitter performance of the SIT9120AC-1B3-25E133.333333G compare to MEMS-based competitors at 133.33333MHz, and what factors dominate short-term vs. long-term jitter contributions?: At 133.33333MHz, the SIT9120AC-1B3-25E133.333333G exhibits integrated jitter of ~1.2ps RMS (12kHz–20MHz integration bandwidth), outperforming many quartz-based solutions limited by aging effects. Short-term jitter (<100Hz) stems mainly from power supply noise coupling into analog core circuits, mitigated by placing decoupling capacitors within 1mm of VDD/VSS pins. Long-term jitter (>1kHz) correlates strongly with frequency stability (±50ppm implies ~±670fs peak-to-peak wander over one second), making temperature control crucial in precision timing loops. Compared to rival MEMS parts at same frequency, this device shows superior immunity to shock and vibration-induced phase modulation.

What are the key differences between LVPECL output staging in the SIT9120AC-1B3-25E133.333333G versus HCSL implementations, and how does output swing affect receiver compatibility?: LVPECL outputs swing between ~1.0V and 1.8V relative to VCC/2 (nominal 2.5V supply), yielding a 800mV differential amplitude—higher than typical HCSL’s 400–600mV swing. This increased voltage improves noise margins but requires receivers tolerant of larger common-mode offsets. HCSL uses current-mode logic with series termination near source, whereas LVPECL relies on parallel termination at load end. Directly connecting these outputs without level-shifting causes overdrive and potential damage; instead, AC-coupling with series capacitors (≥100pF) and proper DC biasing are mandatory for interoperability.

Can the SIT9120AC-1B3-25E133.333333G operate reliably in systems with noisy 2.5V power rails, and what input filtering strategies mitigate supply-induced phase noise?: The device includes built-in power supply rejection ratio (PSRR) features, but sustained ripple above 50mVpp at switching regulator harmonics can modulate oscillation frequency. To suppress this, place 10µF bulk capacitor and two 0.1µF X7R MLCCs in π-filter configuration directly at oscillator pins, with traces shorter than 5mm. Ferrite beads (e.g., 600Ω @ 100MHz) help isolate switching noise if regulators share planes with digital loads. Monitoring supply current waveform under worst-case load transitions ensures no transient dips cross the oscillator’s minimum operating threshold (~2.3V).

What is the expected lifetime of the SIT9120AC-1B3-25E133.333333G under continuous 70°C operation, and how does aging compare to traditional crystal oscillators?: SiTime specifies 10-year operational life at 70°C based on accelerated aging models showing <3ppm/year frequency shift—significantly slower than quartz crystals that degrade 5–10ppm/year due to electrode mass transfer. Over 10 years, the SIT9120AC-1B3-25E133.333333G accumulates less than 0.03% frequency deviation, whereas quartz may shift 0.05–0.1%. This reduces recalibration needs in mission-critical deployments and extends system maintenance intervals, especially in remote or inaccessible installations where physical replacement isn't feasible.

Parts with Similar Specifications

The three parts on the right have similar specifications to SiTime SIT9120AC-1B3-25E133.333333G

Product Attribute
Part Number	SIT9120AC-1B3-25E133.333333E	SIT9120AC-1B3-25E133.333333D	SIT9120AC-1B3-25E133.333333	SIT9120AC-1B3-25E133.333330G
Manufacturer	SiTIME	SiTime	SiTime	SiTime
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Packaging	-	-	-	-
Other Names	-	-	-	-
Detailed Description	-	-	-	-
Manufacturer Standard Lead Time	-	-	-	-
Lead Free Status / RoHS Status	-	-	-	-
Series	-	-	-	-
Size / Dimension	-	-	-	-
Height - Seated (Max)	-	-	-	-
Moisture Sensitivity Level (MSL)	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad

SIT9120AC-1B3-25E133.333333G Datasheet PDF

Download SIT9120AC-1B3-25E133.333333G pdf datasheets and SiTime documentation for SIT9120AC-1B3-25E133.333333G - SiTime.

Datasheets: SiT9120 Datasheet.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.
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

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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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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.

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