QA Tech 125-SDH250S

The QA Technology 125-SDH250S is a socket from the 125-25 series — 0.125 in (3.18 mm) centres, 0.250 in (6.35 mm) full stroke — which QA designs for loaded-board and high-current testing. The socket is pressed into the fixture's probe plate and the spring probe seats in it, so a probe can be changed without unsoldering the fixture wiring.

What distinguishes this variant is the tube material: H is QA's high-conductivity copper alloy with gold plating, the lowest-resistance option in the 125-25 socket range and the one to specify when the channel carries real current rather than a measurement signal. QA offers the H tube only with the S (solder cup) termination, which is what this part number carries.

• QA 125-25 series: 0.125 in (3.18 mm) centres, 0.250 in (6.35 mm) full stroke
• Tube H — high-conductivity copper alloy, gold plated
• Termination S — solder cup
• Mounting hole 0.0940 – 0.0960 in (2.390 – 2.440 mm) in AT7000/G10/FR4; drill 2.4 mm or #41
• Studio records a 2.4 mm mounting hole, 2.5 mm press-fit hole and 7.62 mm collar height
• Paired in Studio with the QA 125-PRG2541S high-current probe