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Clock/Timing

Clock Timing covers the parts that keep a system synchronized: crystal oscillators, clock generators, jitter cleaners, PLLs, buffers, dividers, and real-time clocks. Some designs only need a simple 25 MHz oscillator to drive an MCU, while others depend on a low-jitter clock tree for Ethernet, SerDes, RF, or data converter timing. These parts show up everywhere, from industrial controllers and network switches to medical devices, telecom line cards, and automotive modules. When buyers source clock timing components, the first thing they usually check is frequency stability and jitter, because a cheaper part with worse phase noise can force a redesign later. Package matters too. A lot of engineers still prefer standard SMD packages like 3225 or 5032 for oscillators, but smaller designs keep pushing toward tighter footprints and lower current draw. Supply is the other big issue. Active clock ICs from major brands can go on allocation without much warning, and older RTC or buffer part numbers sometimes drift into last-time-buy status while production is still running. That is where the trade-off usually shows up: pay more for a branded, traceable part now, or gamble on a gray-market offer and risk inconsistent date codes, poor storage, or outright counterfeit stock. For procurement teams, packaging preference is not a small detail either. Tape-and-reel is fine for production, but many repair and NPI builds still need cut tape or small quantities with proper labels and handling. If you are comparing clock timing parts, it helps to send the exact part number, required quantity, target date code, and whether alternates are acceptable. For current stock, lead time, or a quote, check availability at icxing.com.

Frequently Asked Questions

How do I know if a clock timing part is genuine when buying from the open market?

Ask for photos of the label, reel, and lot or date code before placing the order. For timing ICs and oscillators, inconsistent markings and mixed date codes are common warning signs, especially on older or allocated part numbers. Buying through a distributor that can provide traceability lowers that risk.

What specs matter most when comparing oscillators and clock generators?

Start with frequency, stability over temperature, supply voltage, output type, and jitter. For simple MCU clocks, basic stability may be enough, but Ethernet, FPGA, and RF designs often need much tighter phase noise performance. The right part depends on the system budget, not just the headline frequency.

Why do clock timing lead times vary so much between similar part numbers?

Small differences in package, temperature range, frequency option, or output format can turn a common part into a factory-order item. Standard frequencies and popular SMD packages usually move faster, while custom or legacy options may carry long lead times. If your build is urgent, ask about approved alternates early.

Image Part Manufacturer Description Stock Action
100310QCX Fairchild Semiconductor
LOW SKEW CLOCK DR...
5,380
In-stock
Inquiry
100311QI Fairchild Semiconductor
LOW SKEW CLOCK DR...
2,930
In-stock
Inquiry
100311QC Fairchild Semiconductor
LOW SKEW CLOCK DR...
3,420
In-stock
Inquiry
MC100LVEL40DWR2G Fairchild Semiconductor
PHASE DETECTOR, E...
1,570
In-stock
Inquiry
CGS3318M Fairchild Semiconductor
CLOCK GENERATOR
1,320
In-stock
Inquiry
CGS3322M Fairchild Semiconductor
CLOCK GENERATOR
7,150
In-stock
Inquiry
CGS3312MX Fairchild Semiconductor
CLOCK GENERATOR
2,560
In-stock
Inquiry
CGS3322MX Fairchild Semiconductor
CLOCK GENERATOR
1,510
In-stock
Inquiry
KA555IDTF Fairchild Semiconductor
1 FUNC, BIPOLAR, P...
6,250
In-stock
Inquiry
SMA4203-TR-E-FS Fairchild Semiconductor
OSCILLATOR IC FO...
2,020
In-stock
Inquiry
SMA4205-TR-E-FS Fairchild Semiconductor
HIGH FREQUENCY O...
3,570
In-stock
Inquiry
SA555D Fairchild Semiconductor
1 FUNC, BIPOLAR, P...
2,160
In-stock
Inquiry
LM556CM Fairchild Semiconductor
TIMER, 2 FUNC, BIP...
4,550
In-stock
Inquiry
LM555CMX Fairchild Semiconductor
SINGLE TIMER
4,380
In-stock
Inquiry
KA558B Fairchild Semiconductor
4 FUNC, BIPOLAR, P...
5,300
In-stock
Inquiry
NE555D Fairchild Semiconductor
1 FUNC, BIPOLAR, P...
2,810
In-stock
Inquiry
KA555D Fairchild Semiconductor
1 FUNC, BIPOLAR, P...
6,530
In-stock
Inquiry
KA555ID Fairchild Semiconductor
1 FUNC, BIPOLAR, P...
6,010
In-stock
Inquiry
LM555CM Fairchild Semiconductor
LM555 HIGHLY STABL...
4,120
In-stock
Inquiry