380 mOhm on-resistance — what it means for signal integrity
The MAX14589EEWL+T is a single-pole double-throw (DPDT) analog switch from Analog Devices, built for low-loss signal routing in portable and battery-powered gear. Its headline spec is a maximum on-resistance of 380 mOhm, which keeps insertion loss minimal when switching audio, data, or control signals. The channel-to-channel matching is held to 5 mOhm, so the two paths track each other closely — important when the switch is used in differential or stereo signal chains where a resistance mismatch would unbalance the levels.
200 MHz bandwidth — not just an audio switch
With a -3 dB bandwidth of 200 MHz, this part handles more than audio. It can pass high-speed digital signals like SPI, I2S, or video up to SDI resolutions without significant attenuation. The crosstalk is rated at -80 dB at 100 kHz, which is clean enough for multiplexing sensitive analog signals in a mixed-signal path. If you are routing a 1.8 V logic signal through this switch, the 1.6 V to 5.5 V supply range covers that rail directly — no extra level translation needed.
9-WLP package — board-level realities
The part comes in a 9-bump wafer-level package (WLP) measuring 1.26 x 1.26 mm. That saves board space but means the package is essentially the die with solder bumps — no plastic overmold to protect it. The mounting is surface mount, and the bumps are the only mechanical attachment. During rework, the thermal mass is low, so a standard hot-air profile for a 0.4 mm pitch WLP works, but the part is small enough that it can easily blow off the board if the air flow is too high. Orientation is marked by a laser dot on the top surface — find it before placing.