1.8V ~ 3.3V Ultra-tight stability TCXO with EN50155 compliance option

  • Ideally suited for AIS, GPS and tracking applications
  • ±0.5ppm frequency stability option
  • Optional EN50155 compliance for railway applications
  • Ultra-miniature 2520 SM package
Configurable Options
ParameterOption Code
Frequency stability
Temperature range
Supply voltage (VDD)
Operable from 1.8V ~ 3.3V, please specify test voltage:
Quantity / Special Request

Please specify the quantity you require below.

The GTXO-251T is supplied on tape and reel. 1k or 3k pcs per reel are the standard T&R pack sizes for this product. Partial quantities may be supplied on tape (no reel), or in bulk.

Product Description

The GTXO-251T with tight frequency stability options of ±0.5ppm is ideal for rail industry applications as it is optionally available with EN50155 compliance.

In addition to tight stability and rail industry qualification, this TCXO features fast start up time of 3ms maximum, operating temperature range as wide as -40 to +85°C and a miniature 2.5 x 2.0mm package.

The GTXO-251T is operable over the 1.8V-3.6V range, and requires low supply current of 1.5~2.0mA.

This TCXO also features good phase noise characteristics and superbly low ageing of only ±1.0ppm maximum (first year).

Frequency range 16.0 ~ 52.0MHz
Dimensions 2.5 x 2.0 x 0.8mm
Storage temperature range -40 to +85°C
Supply voltage stability ±0.2ppm, VDD ±5%
Load stability ±0.2ppm, ZL ±10%
Frequency slope ±0.05ppm/°C over -30+85°C
Ageing ±1.0ppm max first year
Supply voltage (VDD) Operable from 1.8V ~ 3.3V
Supply current 1.5mA max (up to 26MHz)
2.0mA max (26 ~ 32MHz)
2.5mA max (32 ~ 52MHz)
Output waveform Clipped sine, 0.8V p-p
Test load (ZL) 10kΩ // 10pF
Start up time 3ms max
Harmonics -5dBc max
Phase noise -135dBc/Hz @ 1kHz
Frequency tolerance @ 25°C ±2.0ppm max, 60mins after reflow
Package Drawing
Ordering Information

To request a quotation for the GTXO-251T 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

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
Tape & Reel Specification
Tape and Reel specifications
Handling & Storage

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

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


Ceramic body with gold-plated pads 
Metal lid, seam sealed


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


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