Clock/Timing

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
LMX2531LQ1515E/NOPB National Semiconductor
LMX2531 HIGH PERFO...
7,600
In-stock
Inquiry
LMX2541SQ2060E/NOPB National Semiconductor
LMX2541 ULTRA-LOW N...
1,520
In-stock
Inquiry
LMX2531LQ3010E/NOPB National Semiconductor
LMX2531 HIGH PERFO...
1,030
In-stock
Inquiry
LMK04110SQE/NOPB National Semiconductor
LMK04110 CLOCK JITT...
2,180
In-stock
Inquiry
LMK04111SQE/NOPB National Semiconductor
LMK04111 CLOCK JITT...
5,440
In-stock
Inquiry
LMK03002ISQX/NOPB National Semiconductor
LMK03002 PRECISION...
3,970
In-stock
Inquiry
LMK03000DISQE/NOPB National Semiconductor
LMK03000 PRECISION...
3,510
In-stock
Inquiry
LMK03033ISQX/NOPB National Semiconductor
LMK03033 PRECISION...
2,730
In-stock
Inquiry
LMK04002BISQX/NOPB National Semiconductor
LMK04002 LOW-NOISE ...
3,870
In-stock
Inquiry
LMK03001DISQE/NOPB National Semiconductor
LMK03001 PRECISION...
7,980
In-stock
Inquiry
LMK04031BISQ/NOPB National Semiconductor
LMK04031 LOW-NOISE ...
2,320
In-stock
Inquiry
LMX2324SLBX National Semiconductor
PLL FREQUENCY SY...
3,880
In-stock
Inquiry
LMX2604LQ National Semiconductor
VOLTAGE CONTROLL...
4,890
In-stock
Inquiry
LMX2331USLBX National Semiconductor
IC FREQ SYNTH DUA...
5,660
In-stock
Inquiry
LMX2336USLBX National Semiconductor
IC FREQ SYNTH DUA...
6,780
In-stock
Inquiry
LMX2370SLBX National Semiconductor
PLL FREQUENCY SY...
2,210
In-stock
Inquiry
LMX2360TMX National Semiconductor
PLL FREQUENCY SY...
6,900
In-stock
Inquiry
LMX2354SLDX National Semiconductor
PLL FREQUENCY SY...
2,820
In-stock
Inquiry
LMX2330USLBX National Semiconductor
PLL FREQUENCY SY...
3,420
In-stock
Inquiry
LMX2372SLBX National Semiconductor
IC FREQ SYNTH DUA...
3,390
In-stock
Inquiry