? 2006 microchip technology inc. ds51194p-page 19 transition socket specification sot/dfn/qfn transition sockets sot/dfn/qfn transition sockets and associated hardware are shown below. figure 7: sot transition socket with cable figure 8: dfn/qfn two-part transition socket figure 9: qfn transition socket figure 10: dfn transition socket with cable figure 11: qfn transition socket with cable microchip offers the following sot/dfn/qfn transition sockets: ? XLT06SOT: one 6-lead sot transition socket with cable ? xlt08dfn: one 8-lead dfn two-part transition socket ? xlt08dfn2: one 8-lead dfn transition socket with cable ? xlt16qfn1: one 16-lead qfn transition socket with cable ? xlt28qfn3: one 28-lead qfn transition socket with cable ? xlt28qfn4: one 28-lead qfn transition socket with cable ? xlt44qfn2: one 44-lead qfn transition socket with cable ? xlt44qfn3: one 44-lead qfn transition socket with cable the following sockets have been discontinued: ? xlt28qfn: one 28-lead qfn transition socket. (replaced by xlt28qfn4.) ? xlt28qfn2: one 28-lead qfn transition socket. (replaced by xlt28qfn3.) ? xlt44qfn: one 44-lead qfn two-part transition socket. (replaced by xlt44qfn2.) see the drawings in this section for layout dimensions. sot transition socket target/application board cables cable to processor module pdip device adapter gold standoffs/ adapters dfn/qfn transition socket target/application board cable to processor module pdip device adapter gold standoffs/ adapters qfn transition socket target/application board cable to processor module pdip device adapter gold standoffs/ adapters dfn transition socket target/application board cables cable to processor module pdip device adapter gold standoffs/ adapters qfn transition socket target/application board cables cable to processor module pdip device adapter gold standoffs/ adapters
transition socket specification ds51194p-page 20 ? 2006 microchip technology inc. recommended installation of transition sockets with cables for transition sockets that use a cable, follow these instructions for installing your transition socket on the target board. pcb layout considerations: make sure you leave enough room on the pcb to accommodate the cable, i.e., space your target pads for each device far enough apart so that the cable from one pad group will not interfere with another pad group. 6-pin sot solder instructions: 1. remove protective cable covering from end of cable. 2. position cables on target board (see below). tape down to prevent movement. 3. solder each lead to target pad. 4. remove tape and clean. 8-pin dfn solder instructions: 1. prepare leads by trimming narrowest portion to 0.10-inch maximum in length (see below). 2. position cables on target board (see below). tape down to prevent movement. 3. solder each lead to target pad. 4. remove tape and clean. 8-pin dfn assembly instructions: 1. start with cable associated with pin 1. 2. fold cable up and over, forming a radius. 3. mate with the header on the side of the transition socket assembly, making sure pin 1 mates with the pin labeled ?dfn pin 1?. 4. fold over and mate the other cable. 16-pin qfn solder instructions: 1. remove protective cable jacket from stripped end of cable. 2. lay out the four cables in a ?+? pattern (see below). 3. center each cable on the footprint (see below). tape down each cable to prevent movement. 4. solder each lead to target pad. 5. remove tape and clean 16-pin qfn assembly instructions: 1. start with cable associated with pin 1. 2. fold cable up and over, forming a radius. header pins will now be facing upwards. 3. mate with the socket on the underside of the transition socket assembly, making sure pin 1 mates with the pin labeled ?qfn pin 1?. 4. fold over and mate the other cables. 28/44-pin qfn solder instructions: 1. remove protective cable jacket from stripped end of cable. 2. lay out with long cables opposing each other and short cables opposing each other (see below). 3. place center lead (6th lead for 44-pin, 4th lead for 28-pin) on center target pad to center each cable on the footprint (see below). tape down each cable to prevent movement. 4. solder each lead to target pad. 5. remove tape and clean 28/44-pin qfn assembly instructions: 1. start with cable associated with pin 1. 2. fold cable up and over, forming a radius. header pins will now be facing upwards. 3. mate with the socket on the underside of the transition socket assembly, making sure pin 1 mates with the pin labeled ?qfn pin 1?. 4. fold over and mate the other cables. pin 1 trim leads pin 1 pin 1 header pins facing down center cable on target footprint pin 1 use center lead to center cable on target footprint short short long long header pins facing down
? 2006 microchip technology inc. ds51194p-page 21 transition socket specification recommended pcb layout the recommended target board footprint layout for different pin-counts is shown here. figure 12: 6-pin sot, 8-pin dfn figure 13: 16-pin qfn figure 14: 28-pin qfn figure 15: 44-pin qfn XLT06SOT 6-lead sot-23 to 0.80-inch adapter socket xlt08dfn2 8/14-lead dip to 0.025-inch adapter socket 16 mils 24 mils 50 mils 24 mils 11 mils 26 mils 24 mils 11 mils 26 mils 16 mils 13 mils 26 mils dva pin 1 0.90 0.80 0.30 unless otherwise specified, dimensions are in inches. top view side view 1.50 dva pin 1 dfn pin 1 0.90 1.35 0.30 0.30 unless otherwise specified, dimensions are in inches. top view side view 0.24 2.37 0.09 dva pin 1: location of 8- or 14-lead dip pin 1
transition socket specification ds51194p-page 22 ? 2006 microchip technology inc. xlt16qfn1, xlt28qfn3, xlt28qfn4, xlt44qfn2, xlt44qfn3 multi-lead dip to 0.025-inch adapter socket multi-lead dip to 0.025-inch adapter socket cables dva pin 1 qfn pin 1 1.15 2.45 dva pin 1 qfn pin 1 1.15 2.45 xlt28qfn3 ? 18-lead dip (shown here) xlt44qfn2 ? 40-lead dip (shown here) unless otherwise specified, dimensions are in inches. xlt28qfn4 ? 28-lead dip xlt44qfn3 ? 44-lead dip dip 1 dva pin 1 qfn pin 1 1.15 1.25 xlt16qfn1 ? 14-lead dip front/back view 0.56 top view top view top view cable c xlt16qfn1 1-4 1.30 xlt28qfn3/4 1,2 1.30 3,4 2.00 xlt44qfn2/3 1,2 1.30 3,4 2.00 top view 0.40 0.85 0.40 side view unless otherwise specified, dimensions are in inches. drawing shown is for 28-lead dip. bottom view c
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