everythingRF RF & Microwave Parts Database (h1) - RF Cafe

Bond Wire Properties

Wire bonding is the primary method of making interconnections between an integrated circuit (IC) and a printed circuit board (PCB) during semiconductor device fabrication. Although less common, wire bonding can be used to connect an IC to other electronics or to connect from one PCB to another. Wire bonding is generally considered the most cost-effective and flexible interconnect technology, and is used to assemble the vast majority of semiconductor packages. Bond wires usually consist of one of the following materials: Gold - Aluminum - Copper. Wire diameters start at 15 µm and can be up to several hundred micrometers for high-powered applications. There are two main classes of wire bonding: Ball bonding and Wedge bonding. Ball bonding usually is restricted to gold and copper wire and usually requires heat. Wedge bonding can use either gold or aluminum wire, with only the gold wire requiring heat. -Wikipedia

These values (for a constant current) are typical for standard industry bond wire, and could vary from one product to another.

Here is an article gives equations for calculating fusing current when the duty cycle is very small, "Bond Wire Fusing in ICs with Pulsed Current." Note that much larger currents can be handled with very short pulses. Here is the whitepaper for the formula.

This study by Sandia National Laboratories is titled, "1 Mil Gold Bond Wire Study."

Wire Type	Diameter (mils)	Wire Area (mils²)	Resistivity (Ω/inch)	Typical DC Fusing Current (amps)	Recommended Bond Pad Size (mils)
Gold	1.00	0.79	1.16	0.6-0.7	4 x 4
	1.30	1.33	0.693	0.9-1.0	5 x 5
	1.50	1.77	0.521	1.2-1.4	6 x 6
	2.00	3.14	0.294	1.6-2.0	8 x 8
Aluminum	1.00	0.79	1.33	0.27-0.30	3.5 x 3.5
	1.25	1.23	0.856	0.4-0.5	4 x 4
	1.50	1.77	0.595	0.6-0.7	6 x 6
	2.00	3.14	0.335	1.0-1.2	6 x 8
	3.00	7.07	0.149	2-2.5	9 x 12
	4.00	12.57	0.0838	3.5-4.0	12 x 20
	5.00	19.63	0.0537	5-6	15 x 25
	8.00	50.27	0.0210	11-12	20 x 32
	10.00	78.54	0.0134	16-18	25 x 40
	12.00	113.10	0.0093	21-23	30 x 48
	15.00	176.71	0.0059	20-35	40 x 60
	20.00	314.16	0.0033	50-60	50 x 80

99.99% purity @ 20°C




About RF Cafe
Copyright: 1996 - 2024 Webmaster: Kirt Blattenberger, BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ... All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged. My Hobby Website: AirplanesAndRockets.com