Golledge HCD 50x40 OCXO


High Performance OCXO with CMOS Output and US pin-out

  • Temperature stability down to 1ppb
  • Single 12V supply (12V ~ 30V optional)
  • Standard US footprint & pin-out
  • Custom options available
Configurable Options
ParameterOption Code
Ageing per day (at despatch)
Temperature stability
Operating temperature range
Supply voltage (VDD)
Close-in phase noise (@ 5.0MHz)
Close-in phase noise (@ 10.0MHz)
Quantity / Special Request

Please specify the quantity you require below.

The HCD681 is supplied in boxes. 6 pcs per box is the maximum box size for this product.

Product Description

The HCD681 oven controlled oscillator provides CMOS output with exceptionally tight temperature stability, including options as good as ±1ppb and good close-in phase noise specifications, for example -150dBc/Hz @ 10Hz when operating at 5.0MHz.

The standard US pin-out package provides excellent protection for this high performance oven controlled oscillator which is available at frequencies from 5.0MHz to 20.0MHz and with optional supply voltage, and excellent ageing specifications, with options as good as <2 x 10-10 per day available.

Frequency range 5.0 ~ 20.0MHz
Dimensions 50.8 x 50.8 x 24.5mm
Frequency stability < 1x10-7 per year (option D)
< 2x10-8 per year (option F)
< 1x10-9 per 10% change in VDD
< 5x10-10 per 10% change in load
Storage temperature range -40 to +90°C
Output waveform CMOS / TTL compatible
Frequency adjustment ±5x10-7 (typ) over +0.5 to +7.0V
(sufficient for 10 years ageing min)
Stabilised +7.0V supply provided
Power consumption 5.0W max at switch on
1.2W typ when stabilised at 25°C
Warm up < 1x10-8 after 8mins at +20°C
Allan deviation (ADEV), 1 sec < 5x10-13 over 1 sec (5.0MHz)
< 1x10-12 over 1 sec (10.0MHz)
Far-out phase noise (all freqs) < -155 dBc/Hz @ 1kHz
< -157 dBc/Hz @ 10kHz
< -157 dBc/Hz @ 100kHz
Harmonics < -30dB wrt carrier
Package Drawing
Package footprint and pad configuration drawing for the Golledge HCD 51x51 OCXO showing full dimensions.
Ordering Information

To request a quotation for the HCD681 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.

Handling & Storage

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

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


Solder sealed metal can


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