This is the start of a mini series of blogs discussing frequently asked questions for the 3800 Die Bonder, 8000i Wire Bonder, and the 9000 Wedge Bonder. Check back each week to see the most frequently asked questions for your favorite machines. First up is the 3800 Die Bonder.
Palomar Technologies’ ultra-flexible 3800 Die Bonder is designed for fully automatic, precision microelectronics assembly. The tightly regulated computer-controlled work cell performs up to three channels of adhesive dispense, component placement, eutectic die attach and flip chip operations over a spacious 35.5” x 20” work area. The 3800 Die Bonder is versatile, powerful and can provide specialized functions in addition to its primary functions.
The smallest dot size that can be dispensed is 10 mil with a dispenser, depending on material; however daubing is recommended for smaller sizes. The smallest die the 3800 Die Bonder can handle is 6.5 mil square (165 um). The bond-line thickness is controlled by forcing the application through over-travel (spring) and solenoid (preload). We can ensure the levelness of a die during die attach through pick tool leveling, stage leveling, and the quality of the materials. We can also ensure the repeatability of the turret through setup procedures and standards.
How do you monitor the force during bonding?
Force application during bonding is open loop = no feedback; force is calibrated prior to bonding.
Can you thermo-compression bond?
40 to 80 gram per bump or 5 to 10 bumps with standard flexures, 350⁰ to 400⁰C
What is the MTTA (Mean Time To Assist)
MTTA is defined as the production time divided by the number of assists. An assist is an unplanned interruption; where operation is resumed by a human operator or computer + no replacement of parts (other than consumables) + no further variations from the specifications of equipment operation. MTTA can only be calculated with equipment operating in a production environment. There are many variables impacting MTTA that are not machine related, such as the presentation and quality of the customer's material. A better statistic indicating machine robustness is downtime due to machine related problems. Palomar can only provide data supplied by our customers. High volume, large 3800 Die Bonder install base customers are reporting a Palomar 3800 Bonder downtime of < 4%. The quality of the machine & process can significantly impact MTTA. A machine that is accurate and repeatable reduces one variable to help improve MTTA. The quality of the process can have a large impact on MTTA. For instance, was a DOE (Design of Experiments) performed to determine the "mean values" for the process parameters?
What is the MTTR (Mean Time To Repair)
MTTR is defined as the average elapsed time (not person hours) to correct a failure and return the equipment to a condition where it can perform its intended function, including equipment test time and process test time. The #1 variable for Palomar bonders is spare parts availability. Does the customer have the parts on-hand to repair the bonder? The #2 variable is qualified personnel onsite to repair the bonder. The most immediate repair response is performed by in-house Palomar-trained personnel. Palomar’s technical support via email or phone is also another important benefit. For onsite repairs, Palomar employs field service engineers strategically located near customers locations. Service contracts provides the highest priority response from Palomar. A MTTR value of 2-3 hours (or less) is common for customers with both spare parts and qualified repair personnel onsite.
How often do I need to do PM (Preventative Maintenance) on the 3800?
The frequency of performing preventative maintenance is relative to the amount of machine usage. Guidelines are: average usage less than 20 hours per week = 1 PM per year; average usage 20-60 hours per week = 2 PMs per year; average usage 60-100 hours per week = 3 PMs per year and average usage over 100 hours per week = 4 PMs per year.
Download these resources for more information:
| 3800 Data Sheet | Automated Eutectic Die Attach eBook |
Field Services Data Sheet |
 |
 |
 |
If you have more questions about the 3800 Die Bonder, please contact Katie Finney at kfinney@bonders.com. Don’t miss our second blog of this mini-series next week addressing the frequently asked questions about the 8000i Wire Bonder.
___________
Tim Hughes
Director of Global Customer Service
Palomar Technologies, Inc.