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Home Products Crystals, Oscillators, Resonators Oscillators~~SIT9120AC-1B3-25E148.500000D~~

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SIT9120AC-1B3-25E148.500000D - SiTime

Name: SiTime SIT9120AC-1B3-25E148.500000D
Brand: SiTime
SKU: SIT9120AC-1B3-25E148.500000D
Price: 1.652 USD
Availability: InStock
Rating: 5 (1 reviews)

Manufacturer Part Number: SIT9120AC-1B3-25E148.500000D

Manufacturer: SiTime

Allelco Part Number: 98D-SIT9120AC-1B3-25E148.500000D

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 30,363 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: 30363

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Quantity	Unit Price	Ext. Price
1+	$1.652	$1.65

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Specifications

SIT9120AC-1B3-25E148.500000D Tech Specifications
SiTime - SIT9120AC-1B3-25E148.500000D technical specifications, attributes, parameters and parts with similar specifications to SiTime - SIT9120AC-1B3-25E148.500000D

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	1473-2974-2 SIT9120AC-1B3-25E148.500000D-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-1B3-25E148.500000D compare to typical crystal oscillator modules in industrial temperature environments, and what impact does this have on system timing accuracy?: The SIT9120AC-1B3-25E148.500000D offers ±50ppm frequency stability across its full operating range of -20°C to +70°C. This performance is significantly tighter than conventional 40MHz crystal oscillators, which often exhibit ±100ppm or greater variation under the same conditions due to aging and thermal drift. For a 148.5MHz output, ±50ppm corresponds to a frequency deviation of approximately ±7.4kHz from nominal. In high-speed communication systems such as PCIe or Ethernet applications, this level of stability ensures reliable clock synchronization over time, reducing the risk of bit errors caused by cumulative phase misalignment. Compared to MEMS-based alternatives with similar specifications, this device provides consistent jitter performance without the resonant anomalies sometimes seen in quartz designs.

What are the key differences between LVPECL output configuration and other common oscillator output types like HCSL or LVDS when using the SIT9120AC-1B3-25E148.500000D in high-speed digital systems?: The SIT9120AC-1B3-25E148.500000D features LVPECL (Low-Voltage Positive Emitter-Coupled Logic) output, which operates at differential signaling levels typically around 800mVpp with high noise immunity. Unlike LVDS or HCSL outputs, LVPECL swings between VCC and ground rails rather than using a small differential voltage, making it more suitable for longer trace lengths and higher fanout scenarios in backplane applications. When compared to LVDS, LVPECL consumes more power—approximately 69mA supply current at 2.5V—but offers superior slew rates and better tolerance to ground bounce. In contrast, HCSL uses single-ended signaling with lower amplitude but requires impedance matching networks that can increase board real estate. For systems requiring precise clock distribution over FR4 substrates exceeding 10cm, LVPECL’s inherent noise margin makes the SIT9120AC-1B3-25E148.500000D a robust choice despite its higher power consumption relative to LVDS alternatives.

Can the SIT9120AC-1B3-25E148.500000D be used reliably in automotive-grade temperature ranges beyond its specified -20°C to +70°C operational window, and what failure modes might occur if deployed in extended environments?: The SIT9120AC-1B3-25E148.500000D is rated only for industrial temperatures from -20°C to +70°C. Operation outside this range is not guaranteed and may lead to degraded frequency stability, increased phase noise, or even complete functional failure. At temperatures below -20°C, internal MEMS structures may exhibit reduced drive strength, potentially increasing startup time or causing oscillation failure. Above +70°C, elevated self-heating combined with ambient heat can push junction temperatures beyond safe limits, accelerating material stress and degrading long-term reliability. While some users report marginal operation up to +85°C in short-duration tests, such usage violates datasheet specifications and voids manufacturer warranties. For automotive applications requiring AEC-Q100 qualification or wider temperature spans, alternative SiTime models like those in the Elite series with broader ranges should be considered instead.

How does the power consumption profile of the SIT9120AC-1B3-25E148.500000D affect thermal management in compact PCB layouts, especially when multiple devices are mounted on the same board?: With a supply current of 69mA at 2.5V, the SIT9120AC-1B3-25E148.500000D dissipates approximately 172mW of power continuously during operation. In dense multi-clock designs where several such oscillators share a common power plane, this results in localized heating that must be accounted for in thermal simulation. Although the SMD3225-6P package has minimal exposed pads, cumulative dissipation from four or more units could raise local ambient temperature by 5–10°C above baseline depending on copper coverage and airflow. This heating may indirectly affect nearby components sensitive to thermal gradients, such as RF amplifiers or precision ADCs. Proper layout practices include spacing oscillators away from heat-sensitive ICs and ensuring adequate ground plane stitching beneath the device to distribute heat laterally rather than concentrating it through vias.

Is it possible to program or trim the frequency output of the SIT9120AC-1B3-25E148.500000D beyond its fixed 148.5MHz specification, and what tools or methodologies would be required for customization?: No, the SIT9120AC-1B3-25E148.500000D is factory-programmed to deliver exactly 148.5MHz and cannot be reprogrammed in the field. It belongs to SiTime’s standard programmable oscillator line, meaning each unit is individually calibrated during manufacturing using laser trimming techniques to achieve target frequency within tight tolerances. Field-level frequency adjustment is not supported via external pins or serial interfaces. If application-specific frequencies near 148.5MHz are needed—such as 148.353MHz for certain video encoding standards—users must select a different part number from the same family that matches their exact requirement. Attempting to modify firmware or apply external tuning signals risks damaging the MEMS resonator structure and will invalidate performance guarantees.

What are the advantages of using the SIT9120AC-1B3-25E148.500000D over traditional crystal oscillators in space-constrained embedded designs requiring high-frequency clocks?: The SIT9120AC-1B3-25E148.500000D integrates a complete oscillator circuit into an SMD3225-6P footprint, eliminating the need for bulky external crystals, load capacitors, and matching inductors—typically consuming 4–6mm² on the PCB. This consolidation reduces BOM count by up to three components per oscillator compared to discrete solutions. Additionally, its LVPECL output directly drives differential receivers without additional buffer stages, saving component count further. While both technologies offer comparable frequency accuracy (±50ppm), the integrated approach minimizes parasitic effects from stray capacitance and improves signal integrity at 148.5MHz. However, unlike programmable crystal oscillators that allow post-deployment frequency tweaks, this model’s fixed frequency necessitates correct initial selection, making it ideal for mass-produced systems where design freeze occurs early in development cycles.

How should decoupling capacitors be selected and placed when implementing the SIT9120AC-1B3-25E148.500000D on a high-speed digital motherboard to minimize supply noise and ensure stable operation?: For the SIT9120AC-1B3-25E148.500000D, a 2.5V supply requires careful decoupling to maintain low phase noise and prevent spurious emissions. A minimum of two capacitors is recommended: a 100nF X7R ceramic capacitor placed within 1mm of the VDD pin, and a 10µF tantalum or polymer capacitor located no farther than 5mm away to handle transient current demands. The 100nF part suppresses high-frequency switching noise generated by the internal PLL circuitry, while the larger capacitor stabilizes voltage during load transients associated with LVPECL output transitions at 148.5MHz. Ground return paths must be kept short and wide, ideally connected directly to a solid ground plane beneath the oscillator. Improper decoupling can manifest as measurable jitter degradation or even intermittent lock loss during power-up sequences, particularly in noisy environments with switching regulators sharing the same power rail.

In what scenarios would choosing the SIT9120AC-1B3-25E148.500000D over a lower-cost crystal-based solution result in meaningful system-level improvements, despite higher per-unit cost?: The SIT9120AC-1B3-25E148.500000D justifies its premium pricing in applications demanding predictable jitter performance, simplified PCB layout, and reduced calibration overhead. Unlike crystal oscillators prone to mode splitting or harmonic resonance near target frequencies like 148.5MHz, this MEMS-based device delivers flat spectral characteristics across process corners, enhancing link margin in serial protocols such as HDMI or DisplayPort. Its integrated design also eliminates sensitivity to mechanical shock and vibration—critical in mobile or industrial equipment subject to handling stresses. Furthermore, automated assembly compatibility (Tape & Re reel packaging) streamlines high-volume manufacturing compared to hand-soldered crystal modules. When total cost of ownership is evaluated—including test fixtures, yield loss from crystal mismatches, and rework expenses—the SIT9120AC-1B3-25E148.500000D often proves economically favorable despite higher initial bill-of-materials cost.

Parts with Similar Specifications

The three parts on the right have similar specifications to SiTime SIT9120AC-1B3-25E148.500000D

Product Attribute
Part Number	SIT9120AC-1B3-25E148.500000G	SIT9120AC-1B3-25E148.500000	SIT9120AC-1B3-25E148.500000E	SIT9120AC-1B3-25E155.520000D
Manufacturer	SiTime	SiTime	SiTIME	SiTime
Height - Seated (Max)	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Series	-	-	-	-
Other Names	-	-	-	-
Detailed Description	-	-	-	-
Moisture Sensitivity Level (MSL)	-	-	-	-
Size / Dimension	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Lead Free Status / RoHS Status	-	-	-	-
Packaging	-	-	-	-
Manufacturer Standard Lead Time	-	-	-	-

SIT9120AC-1B3-25E148.500000D Datasheet PDF

Download SIT9120AC-1B3-25E148.500000D pdf datasheets and SiTime documentation for SIT9120AC-1B3-25E148.500000D - SiTime.

Datasheets: SiT9120 Datasheet.pdf

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Customer Reviews

Evaluation: 10 Articles

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.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.
Daic***K.

Mar 23, 2026

Very good. No issue after long time testing.

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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.
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