A2L-Based HVAC/R​

HVAC/R applications represents harsh environment  with wide temperature swings and electrical transients. When compared to quartz crystal oscillators, MEMS-based oscillators are more resistant to shock and vibration, highly immune to electromagnetic energy and power supply noise. Moreover, in applications concerned with gas permeability, SiTime offers hermetic solutions.

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Precision Timing in A2L-Based HVAC/R

Driven by environmental as well as regulatory concerns, the HVAC industry is undergoing a transition to a new class of refrigerants, known collectively as A2L — an ASHRAE classification, where A represents low toxicity and 2L slow burning, low flammability. While there are no specific regulations in either the US or the EU mandating the use of A2L, these regions do require refrigerants with a GWP below a specific threshold (typically, 700 for stationary residential and light commercial air conditioning and heat pumps).

Given that A2L carries a flammability risk (albeit, low), the detection and mitigation of any refrigerant leak is essential. This requirement is driving designers to look for robust timing solutions that can withstand the harsh environments in which HVAC/R systems operate.

SiTime Timing Solutions

More robust in harsh environments

• 4x better vibration resistance — 0.1 ppb/g typical
• 20x better shock survivability

Better stability over a wide temperature range

• Up to -55 to +125°C operation
• Airflow and thermal shock resistant — 1 ppb/°C

Programmability for flexible design

• Any frequency, any stability, any voltage within a wide range
• Qualify once for multiple parts

Higher quality and reliability

• Up to 50x better reliability — 2.2 billion-hour MTBF
• Lifetime warranty

Unique features

• EMI reduction — Up to 30 dB lower
• Low power for longer battery life
• Smaller size — Down to 1.2 mm x 1.1 mm packages