SiTime Endura Super-TCXO Delivers 100x Higher System Reliability for Aerospace and Defense

SiTime Corporation, the precision timing company, introduced a new member to its field-proven Endura™ MEMS ruggedized Super-TCXO® family—the SiT5543. This temperature-controlled oscillator redefines the TCXO landscape for aerospace and defense systems with unmatched stability in challenging environments. SiTime’s new, ruggedized SiT5543 Super-TCXO offers unprecedented ±5 ppb frequency stability over temperatures from -40 °C to 95 °C, even during fast temperature transients and under vibration. The SiT5543 delivers an impressive 20x improvement in stability over existing open-market, quartz-based TCXOs, which cannot provide stability better than ±100 ppb.

Before the advent of SiTime’s Super-TCXOs, designers had to use oven-controlled crystal oscillators (OCXOs) to achieve ±5 ppb stability in aerospace and defense systems. However, quartz-based OCXOs pose several drawbacks. They are notoriously expensive, bulky, fragile, and power-hungry. The SiT5543 overcomes these challenges and offers designers of ruggedized systems a remarkably better option that matches the temperature stability of conventional OXCOs. It provides 100x higher reliability, 2x lower power consumption, and 40 percent smaller size than quartz OCXOs, making the SiT5543 an ideal replacement for OCXOs in demanding applications such as high-speed data communications, military networks, electronic systems, and avionics.

The SiT5543 Super-TCXO significantly reduces bit error rate, system size, and power consumption while enhancing reliability and operational performance in harsh conditions. The technical specifications of this MEMS-based Super-TCXO enable a new level of secure, timing-dependent encryption technology to protect military radios, GPS receivers, navigation, and guidance systems from jamming events. This new Endura Super-TCXO provides stability over temperature and under vibration required for high-speed networks that form the backbone of today’s aerospace and defense systems. The SiT5543 reduces risk, cycle time, and cost in meeting tough operational requirements due to the superior robustness of MEMS technology over legacy quartz alternatives.

The SiT5443 Super-TCXO reduces design cost and complexity due to its small 7 mm x 5 mm surface-mount footprint, low power requirements, and unique ability to mitigate the effects of harsh operating conditions. Since it is factory-programmable to support output frequencies ranging from 1 to 60 MHz, it eliminates the high cost, risks, and delays of custom oscillators. The SiT5543 is available with I2C digital control for on-the-fly frequency tuning or for advanced user-defined compensation. Digital control provides noise-insensitive frequency adjustment with smooth frequency shifts.

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