The MAX4645/MAX4646 are single-pole, single-throw (SPST) analog switches with a typical on-resistance (RON) of 2.5Ω and a flatness of 0.4Ω. The switches can handle Rail-to-Rail analog signals and have low power requirements, small board space, and high reliability compared to mechanical relays. They are ideal for low-distortion applications and are the preferred solution in automated test equipment or applications where current switching is required. They operate from a +1.8V to +5V supply, making them suitable for battery-powered applications. The switches have fast switching speeds and low leakage currents. The MAX4645 is a normally open (NO) switch, and the MAX4646 is a normally closed (NC) switch.
The MAX4645/MAX4646 are single‑pole, single‑throw (SPST) CMOS analog switches featuring a typical on‑resistance of 2.5 Ω and a flat RON of 0.4 Ω max at a 5 V supply. They support rail‑to‑rail analog signals, have ultra‑low off‑leakage (0.25 nA) and are suited for battery‑powered systems, audio/video routing, data‑acquisition, sample‑and‑hold circuits, and relay replacement.
Electrical specifications include a supply range of +1.8 V to +5 V, turn‑on time of 12 ns, turn‑off time of 8 ns, and operation from –40 °C to +85 °C. The devices are offered in 5‑pin SOT‑23, 6‑pin SOT‑23, and 8‑pin µMAX packages.
| Typical On‑Resistance (RON) | 2.5 Ω |
|---|---|
| Maximum On‑Resistance (RON) at 5 V | 0.4 Ω max |
| Supply Voltage Range | +1.8 V to +5 V |
| Turn‑On Time (tON) | 12 ns |
| Turn‑Off Time (tOFF) | 8 ns |
| Off‑Leakage Current | 0.25 nA max |
| Operating Temperature Range | -40 °C to +85 °C |
The typical on‑resistance is 2.5 Ω.
They operate from a single supply of +1.8 V to +5 V.
Turn‑on time is 12 ns and turn‑off time is 8 ns.
The maximum off‑leakage current is 0.25 nA at +25 °C.