TD-74.250MBD-T Crystals, Oscillators, Resonators

Frequency Stability:	±25ppm
Current - Supply (Disable) (Max):	--
Height - Seated (Max):	0.032" (0.80mm)
Size / Dimension:	0.098" L x 0.079" W (2.50mm x 2.00mm)
Package / Case:	4-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	30mA
Operating Temperature:	-40°C ~ 85°C
Series:	TD
Voltage - Supply:	3.3V
Output:	CMOS
Function:	Enable/Disable
Frequency:	74.25MHz
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Obsolete
Packaging:	Digi-Reel®

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OscillatorsTD-74.250MBD-T is a precision temperature-controlled oscillator (TCXO) manufactured by ECS Inc. which almost serves as the heart of the communication system in terms of frequency accuracy with its tri-frequency and ultra-miniature size as the most advanced TCXO products. It is suitable for various applications in Global System for Mobile (GSM), cellular, trunk radio, cordless phone, and view data systems. This article aims to explain the application field and working principle of TD-74.250MBD-T precisely. Application FieldTD-74.250MBD-T is the leading product in the market, manufactured by ECS Incorporated. Its ultimate frequency stability is provable for all kinds of system, working within the temperature range from -40°C to +85°C. This stability is especially necessary to drive systems in which communication is required in order to provide accurate and reliable transmission links between the sending and receiving channels. As a "heart" of these systems, TD-74.250MBD-T is featured with a frequency accuracy of 0.1ppm (parts per million) and a temperature sensitivy ratings of 0.2ppm, 0.3ppm, 0.5ppm, and 1ppm/°C, which makes it the ideal device for Global System for Mobile (GSM), cellular, trunk radio, cordless phone, and view data systems. Besides, it is also very suitable for applications which involve tight frequency tuning requirements, such as RF tags, RF sensors, security systems, wireless remote control, and logic circuits.Working PrincipleIn the process of making TD-74.250MBD-T to be the highly-accurate device, ECS Incorporated introduces the advanced plating copper ball process by which all the components will be contacted with solder ball completely and allow high frequency transitioning over the circuit. By plating copper balls, better performance is achieved through improved solder joint life and additional thermal management. Furthermore, the advanced technology also helps to reduce circuit noise and crosstalk.TD-74.250MBD-T consists of several key components. Firstly, it has a vibration element which is made of a quartz crystal of which dimension is very tiny and which is mounted by four pieces of metal legs. Different size of the cube crystal determines the different frequency outputs. As the circuit is powered up, the current passing through the quartz crystal causes it to vibrate, and outputs a signal. Besides, TD-74.250MBD-T also includes metallic hermetic packages which is used as the temperature sensor to detect the changes in ambient temperature. This package, together with the internal circuit are both assembled in a metal can filled with inert gas. The idea of making the internal components look like a sealed container is to ensure that the quartz crystal in the position to minimize the drift due to temperature change, and that any temperature variation can be detected by the internal sensor and shown by a voltage drop in the circuit. Finally, on the circuit board, several electronic components are integrated to isolate the vibration element from the digital circuitry and regulate the output frequency of the oscillator. This process of isolation helps to balance the generated signal to stabilize the circuit performance and frequency accuracy.To ensure the reliability and consistent performance of TD-74.250MBD-T, it is manufactured under various safety tests. In addition to the foregoing technical information, it is also certified by Telecordia GR-1244-CORE which ensures the reliability for up to 2 years long. With the above combination of silver-tipped discrete components, carefully suited coatings, chemically pre-treated C-rate die-attach, and other unique ECS processes, this TCXO embodies greater performance and stability along with a longer life composition.In conclusion, TD-74.250MBD-T stands out to be the perfect option for applications that demand high frequency accuracy and reliability. In comparison with the traditional TCXOs in the market, it is the top-tier product that offers remarkable frequency stability, temperature stability, high quality, and long-term durability that makes the overall communication systems more efficient and reliable.

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