The MAX4527ESA+ from Analog Devices is an active-production SPDT analog switch configured as a dual 2:1 multiplexer/demultiplexer. It is built for precision signal routing where low charge injection and tight channel matching matter.
Signal-path parametrics for precision analog
On-state resistance is 175 Ohm maximum, with channel-to-channel matching held to 500 mOhm — this keeps the gain error across the two switch paths within 0.3 % for a 10 kOhm load. Charge injection is rated at 1 pC typical, which translates to a 1 mV glitch into a 1 nF hold capacitor — low enough for sample-and-hold or PGA gain-switching without an external compensation cap on the summing node. Off-channel leakage is 500 pA maximum, and the off-channel capacitance is 13 pF per port — together they set the crosstalk floor at roughly -80 dB into a 10 kOhm load at 1 kHz.
Package and board integration
Housed in an 8-pin SOIC (0.154-inch body width, 3.90 mm wide), the part is a surface-mount device supplied in tubes. The 8-SOIC footprint is a standard JEDEC outline — the PCB land pattern matches countless other 8-pin SOIC parts, so no special layout work is needed.