Thermal Compression Bonding (TCB) is a pivotal technology utilized in semiconductor packaging, particularly in 3D stacked memory applications. Below is an overview of this technology and its associated equipment:
     1. What is Thermocompression Bonding (TCB)?
     TCB is a high-precision bonding process in which heat and pressure are applied to a stack of semiconductor chips to establish reliable interconnections between layers. It is commonly used for packaging stacked memory devices, such as DRAM, flash memory, and other 3D ICs. The goal is to achieve a robust, low-resistance bond that ensures both electrical and thermal conductivity, while maintaining the structural integrity of the stacked layers.
     2. Key parameters of TCB equipment technology:
     Temperature: The general range is from 250°C to 350°C, depending on the material used (such as solder or copper).
     Pressure: used to ensure uniform adhesion and prevent misalignment or voids.
     Time: The binding time typically ranges from a few seconds to a few minutes, depending on the size and complexity of the stack.
     Fluxless TCB technology: Fluxless TCB is a variant of the traditional TCB process, in which formic acid is used as a chemical reagent during the bonding step. The use of formic acid helps to improve the bonding process by reducing the oxidation of metal bumps and enhancing bonding reliability.
     Example of TCB process flow:

    Thermal compression bonding requires precise connection between materials (such as chips and substrates, metal bumps, etc.) under high temperature and pressure. Its success is highly dependent on temperature uniformity and control accuracy. High and low temperature heat flow instruments ensure uniform heating of materials during the bonding process by accurately simulating extreme temperature environments, thereby improving the quality and reliability of the bonding.
    The ThermoTST TS560, developed and produced by ZONGLEN, is a precise Temperature Forcing System with a wider temperature range from -70℃ to +225℃, covering the entire process of thermal compression bonding from low-temperature preheating to high-temperature bonding, meeting the bonding temperature requirements of different materials (such as copper bumps and polymers). The temperature conversion takes about 10 seconds from -55℃ to +125℃, which is highly compatible with the process flow of "rapid heating to bonding temperature → heat preservation → rapid cooling" in thermal compression bonding, shortening the single bonding cycle and improving production efficiency.
 The temperature control accuracy is ±1℃, and the display accuracy is ±0.1℃. High-precision temperature control ensures uniform temperature distribution on the bonding interface, avoiding bonding defects (such as voids and warping) caused by local overheating or overcooling.
After long-term verification under multiple working conditions, TS560 meets the requirements of various production and engineering environments. TS560 utilizes pure mechanical cooling, eliminating the need for liquid nitrogen or any other consumable refrigerants.
     The following characteristics of the Temperature Forcing Systems directly support the thermocompression bonding process:
     Temperature uniformity: Ensure that the temperature difference within the bonding chamber is ≤2℃ to avoid local overheating that may lead to material deformation or bonding failure.
     Rapid temperature change capability: Shorten heating/cooling cycles to enhance production efficiency.
     Multi-dimensional reliability verification: By simulating environments required by standards such as automotive electronics (AEC-Q100) and aerospace (DO-160), we ensure the stability of bonding structures under complex working conditions.
     Through high and low temperature impact testing, the performance changes of bonding materials at different temperatures can be evaluated, thereby optimizing the material formulation and process parameters, and enhancing the stability and reliability of the bonding materials.

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