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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
LMX2331LTMX National Semiconductor
FREQUENCY SYNTHE...
3,550
In-stock
Inquiry
LMX2310USLDX/NOPB National Semiconductor
PLL/FREQUENCY SY...
6,390
In-stock
Inquiry
LMX2371SLBX National Semiconductor
IC FREQ SYNTH DUA...
3,550
In-stock
Inquiry
LMX2331UTM National Semiconductor
IC FREQ SYNTHESI...
6,730
In-stock
Inquiry
LMX2336UTM National Semiconductor
IC FREQ SYNTHESI...
4,200
In-stock
Inquiry
LMX2531LQ1910E National Semiconductor
PLL FREQUENCY SY...
3,940
In-stock
Inquiry
LMK03000DISQ National Semiconductor
CLOCK GENERATOR,...
6,990
In-stock
Inquiry
LMX2541SQE3030E National Semiconductor
PLL FREQUENCY SY...
5,630
In-stock
Inquiry
LMX2434SLEX National Semiconductor
PLL FREQUENCY SY...
4,020
In-stock
Inquiry
LMX2430TM/NOPB National Semiconductor
LMX2430 3.0 GHZ/0.8 GH...
4,220
In-stock
Inquiry
LMX2486SQ/NOPB National Semiconductor
LMX2486 DELTA-SIGM...
1,360
In-stock
Inquiry
LMX2531LQ1415E National Semiconductor
PLL FREQUENCY SY...
5,980
In-stock
Inquiry
LMX2541SQ2380E National Semiconductor
PLL FREQUENCY SY...
3,750
In-stock
Inquiry
LMK03000DISQ/NOPB National Semiconductor
LMK03000 PRECISION...
2,950
In-stock
Inquiry
LMK04806BISQX/NOPB National Semiconductor
LMK04806 LOW NOISE ...
2,490
In-stock
Inquiry
LMK03001CISQ National Semiconductor
CLOCK GENERATOR,...
7,560
In-stock
Inquiry
LMK03001ISQ/NOPB National Semiconductor
LMK03001 PRECISION...
7,930
In-stock
Inquiry
LMK03001DISQ/NOPB National Semiconductor
LMK03001 PRECISION...
7,380
In-stock
Inquiry
LMK04002BISQ/NOPB National Semiconductor
LMK04002 LOW-NOISE ...
7,310
In-stock
Inquiry
LMK04011BISQ/NOPB National Semiconductor
LMK04011 LOW-NOISE ...
5,060
In-stock
Inquiry