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FX135 Tuning Fork

Fox Electronics and Digi-Key Offer the FX135 Miniature Watch Crystal

The FX135 is the smallest miniature watch crystal available, measuring just 3.2 mm x 1.5 mm with a very low profile of 0.9 mm. The extremely small size of the new FX135 watch crystal makes it ideal for applications where space is critical, such as in portable and handheld devices.

With a frequency of 32.768 kHz, these new surface mount device (SMD) are optimized for a standard 12.5 pF load capacitance. Frequency tolerance is ±20 PPM at 25°C (77°F) and frequency stability is -0.045 ppm / (ΔC°)2 over the standard operating temperature of -40°C to +85°C (-40°F to 185°F). 		Fox Electronics FX135

Standard Specifications
Parameters Max
Frequency 32.768 kHz
Frequency Tolerance @ 25°C ±20 PPM
Frequency Stability Temperature Coefficient -0.045 PPM / (Δ°C)2
Temperature Range
  Turnover
  Operating
  Storage 		 
+20°C ~ +30°C
-40°C ~ +85°C
-55°C ~ +125°C
Equivalent Series Resistance 70 kΩ
Load Capacitance 12.5 pF
Insulation Resistance @ 100VDC 500 MΩ Min.
Drive Level 1.0 µW
0.1 µW Typ.
Aging Per Year ±3 PPM
Max Soldering Temp/Time 260°C / 10 Seconds
Moisture Sensitivity Level (MSL) 1
Termination Finish Ni/Au
Fox Electronics FX135 Diagram
Ordering Information
Digi-Key Part Number Mfg. Part Number Frequency Packaging Operating Mode
631-1002-2-ND FX135A-327 32.768 kHz Tape and Reel Fundamental Datasheet
631-1002-1-ND Cut Tape
631-1002-6-ND Digi-Reel®