16:1 analog multiplexer in a 28-SOIC
The Maxim Integrated DG506ACWI is a monolithic CMOS analog multiplexer configured as a single 16-channel multiplexer / demultiplexer (16:1 circuit). It routes one of sixteen analog or digital signal paths to a common output, controlled by a 4-bit address. The part is built for precision signal routing in data-acquisition systems, test equipment, and audio switching where low leakage and moderate on-resistance are acceptable. Key characteristics include a maximum on-resistance of 450 Ohm, channel-to-channel matching of 27 Ohm, and a switch time of 1 µs turn-on / 400 ns turn-off (typical). Off-channel leakage is rated at 5 nA max, and channel capacitance is 6 pF.
The 450 Ohm max on-resistance is the dominant spec for signal attenuation. In a typical 10 kΩ load, the mux adds about 4.3% voltage drop — acceptable for many ADC front-ends and audio paths, but a design with a 1 kΩ load would see nearly 31% loss. The 27 Ohm channel-to-channel matching ensures that the attenuation is consistent across channels, which matters for gain-matched multiplexed systems. The 1 µs turn-on time is fast enough for scanning 16 channels at sample rates up to about 60 kS/s, assuming one channel per sample. For higher-speed applications like video switching or RF routing, a faster mux family (e.g., with sub-100 ns switching) would be needed.
RoHS non-compliance — a BOM flag
Any design targeting EU RoHS, China RoHS, or similar regulations will require a waiver or an alternate part. The lead (Pb) content in the solder finish or die attach is the typical reason. If your assembly line is RoHS-only, this part cannot be placed without a deviation. For new designs, consider a RoHS-compliant variant in the same family if available.
Package and mounting
The DG506ACWI is supplied in a 28-SOIC (0.295", 7.50 mm width) surface-mount package. The wide-body SOIC is a standard footprint for analog muxes and is pick-and-place friendly.
Lifecycle and compliance
No LTB or obsolescence risk for new designs. The part is RoHS non-compliant — factor that into your BOM compliance review.
