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TCXO General Information

surface mount temperature compensated crystal oscillator hcmos clipped sine wave surface mount temperature compensated crystal oscillator thru hole 14 pin dip tcxo for pcb type smd 5x7mm and 5x3.2mm tcxo temperature compensated oscilator
Go to all [ TCXO - Temperature Compensated Crystal Oscillators ]

A TCXO is best viewed as a derivative of a standard Crystal Oscillator for use in applications where an improvement in the devices Temperature Stability is required. The premise holds that the TCXO designer can flatten the Temperature versus Frequency curve in order to spec a device meeting these more precise characteristics. Aging characteristics can also be improved upon versus a standard Crystal Oscillator.

A Temperature Compensated Crystal Oscillator (TCXO) utilizes the following design features differing substantially from a basic Crystal Oscillator design:

1. Specially processed tight tolerance crystal manufactured for both accuracy and to offer minimized long term aging.

2. Temperature/frequency compensation network made up of thermistors, resistors, and capacitors in an oscillation loop. The thermistor network is matched to the tight tolerance crystal causing the voltage to vary with temperature thereby compensating for the inherent frequency versus temperature characteristics.

3. A frequency/tuning adjustment allowing for manual trimming of the TCXO to compensate for aging and/or other Environmental influences. The method of frequency adjustment can also be electrical via an additional pin located on the package (utilizing an external potentiometer, for instance), or a TCVCXO utilizing both temperature compensation and external voltage control.

4. Buffering to minimize the effects of external changes in the circuit.

5. An internal regulator to minimize the effects of variation in voltage.

Specifying an Oscilent TCXO:

Generally, TCXO's are manufactured according to industry standard guidelines pertaining to such variables as package type, output types, input voltages and currents, rise/fall times, and duty cycles. Although these parameters may vary slightly between manufacturers, and review of these parameters should be done when crossing between manufacturers, one can generally assume that these parameters will remain constant. When selecting a TCXO/VCTCXO product, careful consideration should be given to the following variables for which designations are made when selecting an Oscilent Part Number:

a. Package Type: Will the package be Through Hole or Surface Mount, and are there size constraints with either.

b. Output: Usually one of TTL, HCMOS, Clipped Sine Wave, or Compatible (simultaneous TTL and HCMOS compatible) while reviewing the characteristics of Load, Output Levels, and Input Currents associated with each Output type referenced in the Electrical Parameters portion of the Oscilent TCXO spec.

c. Frequency

d. Supply Voltage: Most TCXO products are designed to operate at either 5.0V, or 3.3V, although other options are available. The Oscilent Specification assumes this standard. For other Supply Voltage options, please contact Oscilent for assistance

Frequency Stability:

Over the Operating Temperature Range, an amount of total deviation acceptable for the application. Oscilent provides a Frequency Stability versus Temperature chart on most TCXO product Specifications. This chart should be used as a general guide only as, variations to this parameter are available. For a TCXO, industry standard selections range from 1.0ppm to 5.0ppm over temperature. For applications requiring <1ppm Frequency Stability, please contact Oscilent Engineering Support for assistance.

Operating Temperature:

Because of the more precise characteristics of a TCXO compared to standard Crystal Oscillators, an increased focus on Operating temperature is recommended. For TCXO's the Operating Temperature Ranges are smaller and offer many more options. Generally, a TCXO has a standard range of -40-+80 degrees Celsius, however the Operating Temperature is a significant influence on what is possible in production from Stability perspective, in addition to influences on production costs, so special consideration should be given in an attempt to avoid "over-specifying" the required Operating Temperature.

Frequency Deviation:

In TCXO product design, a package pin/pad is normally chosen to provide for initiating the VCTCXO (voltage control) option. For normal TCXO operation, this pin is designated as "No Connection." However, when the Voltage Control option is exercised in part number selection, a designation must be made that, not only specifies that this function is needed, but also specifies the amount of deviation required for this adjustment.

Oscilent is a manufactuer of TCXO and a supplier worldwide for various applications and markets. Oscilent offers standard products and have designers in-house for custom TCXO devices.

PDF Library of TCXO - Temperature Compensated Oscillators
Oscilent Series
Number [ pdf spec ]
Type Package Frequency Range html Version

501 ~ 504

Thru Hole 5 Pin Thru Hole 1.2 ~ 100 MHz
511 ~ 514 Thru Hole 14 Pin Dip LP 1.2 ~ 100 MHz
515 ~ 518 Thru Hole 14 Pin Dip 1.2 ~ 100 MHz

521 ~ 524

Surface Mount 14 Pin Dip SMD 1.2 ~ 100 MHz
531 ~ 534 Surface Mount 11.4 x 9.6 SMD 10 ~ 30 MHz
580 Surface Mount 11.4 x 9.6 SMD 10 ~ 26 MHz
581 Surface Mount 5 x 7mm SMD 10 ~ 26 MHz


Surface Mount 5 x 3.2mm SMD 12.8 ~ 26 MHz

TCXO Industry Definitions

A voltage-controlled oscillator or VCO is an electronic oscillator designed to be controlled in oscillation frequency by a voltage input.

Crystal Oscillator
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency.

An oscillator of this type is known as an Oven-Controlled Crystal Oscillator (OCXO, where "XO" is an old acronym for "crystal oscillator".)

An electronic oscillator is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave. They are widely used in innumerable electronic devices.

Tuning Fork
A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (tines) formed from a U-shaped bar of elastic metal (usually steel).

Open Sound Control (OSC) is a content format for messaging among computers, sound synthesizers, and other multimedia devices that are optimized for modern networking technology.

A resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonant frequencies, with greater amplitude than at others. The oscillations in a resonator can be either electromagnetic or mechanical (including acoustic).

Saw Filter
A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material exhibiting elasticity, with an amplitude that typically decays exponentially with depth into the substrate.

Saw Duplexer
RF and microwave devices will include some kind of filtering on the signals transmitted or received. Such filters are commonly used as building blocks for duplexers and diplexers to combine or separate multiple frequency bands.

TCXO - For more information regarding TCXO products, please contact our Sales Department.


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