Golledge 25.8x25.8x13.0mm OCXO


High stability OCXO with low phase noise available up to 100MHz 

  • Sine or CMOS output
  • Excellent short term stability 
  • Fast warm-up time 
  • Enhanced phase noise performance 
  • Extended operating temperature range, +125°C option
Configurable Options
ParameterOption Code
Ageing per day (at despatch)
Temperature stability
Operating temperature range
Output waveform
Phase noise (@ 100MHz)
Supply voltage (VDD)

Phase noise options may not be available at certain frequencies with a 3.3V supply or over extended operating temperature range of -40 to +125ºC. Check with our sales office before ordering.

Quantity / Special Request

Please specify the quantity you require below.

The HCD280 is supplied in boxes. 10 pcs per box is the maximum box size for this product.

Product Description

The HCD280 oven controlled oscillator provides excellent stability and phase noise characteristics, at frequencies from 30.0 ~ 100MHz and conforms to MIL-STD-202 standards for shock, vibration and humidity specifications.

This OCXO boasts three different phase noise profiles (A, B, and C), including superb close-in phase noise of -105 dBc/Hz @ 10Hz, and excellent phase noise floor of -170 dBc/Hz @ 10kHz (profile C).

This OCXO also provides excellent overall stability, with temperature stability options as good as ±10ppb, and frequency stability of <500ppb per year. A choice of ageing characteristics is also available, with options down to <±1x10-9 per day. Frequency adjustment sufficient for 10 years ageing minimum also comes as standard.

Several supply voltage options are available, including 3.3V, 5.5V and 12.0V, along with the choice of sine output (+9dBm ±1dBm into 50Ω AC coupled) or CMOS (10kΩ//15pF 45:55 Max). 

Speak to a member of our expert frequency team today for advice and more information on the HCD280 by calling +44 1460 256 100.

Frequency range 30.0 ~ 100MHz
Dimensions 25.8 x 25.8 x 13.0mm
Frequency stability <100ppb per month
<500ppb per year
<1ppb per 10% change in VDD
Storage temperature range -55 to +150°C
Frequency adjustment ±0.5ppm over 0 to +8V for +12V supply
±0.5ppm over 0 to +5V for +5V supply
±0.5ppm over 0 to +3.3V for +3.3V supply
(sufficient for 10 years ageing min)
Power consumption 4.0W max at warm-up
1.2W steady state @ +25°C
Warm up <1ppm after 3 mins @ +20°C
Allan deviation (ADEV), 1 sec < 1x10-11
Harmonic distortion  <-30dBc  
Spurious  -80dBc max 
Shock MIL-STD-202, IEC 68-2-27 Test Ea 50g for 11ms
Vibration MIL-STD-202, IEC 68-2-06 Test Fc 10-55Hz, 1.5mm. 55-500Hz, 10g
Humidity MIL-STD-202 100% rh
Seal MIL-STD-202 Hermetic, washable
Package Drawing
Ordering Information

To request a quotation for the HCD280 please use the configurable options form to choose the options you require and then submit your configured product to our team. Our expert advisers are always happy to help with your requirements and can be contacted on +44 1460 256 100 or at sales@golledge.com.

Following product selection you will be issued with a seven character Golledge part number. Your Golledge part number is the internationally accepted Golledge manufacturing part number (MPN) that should be used for all project documentation, including bills of materials (BoMs) and purchase orders.

If you have any queries regarding any of our documentation our dedicated sales team will be happy to help.

Soldering Profile
Solder reflow profile
Handling & Storage

ESD-HBM-1A Human Body Model (HBM) 1A (250V to <500V)

MSL1 Moisture Sensitivity Level (MSL): 1 (or not applicable)


PbFree Lead-free (< 0.1% by weight )

RoHS compliant with no exemptions RoHS compliant with no exemptions. See our declaration

REACH REACH compliant. See our statement

Conflict Minerals Statement Free of conflict minerals. See our declaration

Halogen Free Statement Free of Halogens. See our declaration

Ozone Depletion Statement Free of Ozone-depleting substances. See our declaration