The MAX4649 is a low on-resistance, single-pole double-throw (SPDT) analog switch from Texas Instruments. Its on-resistance is a maximum of 45 ohms and flat (7 ohms maximum) over the specified signal range. The MAX4649 can handle Rail-to-Rail® analog signals and conducts analog or digital signals equally well in either direction. This switch operates from a single +9V to +36V supply, or from ±4.5V to ±20V dual supplies. The primary application areas are in the switching and routing of signals in telecommunications and test equipment. The MAX4649 features a switch transition time of 130ns maximum at +25°C, and a guaranteed break-before-make switching time of 5ns. Off-leakage current is only 2nA maximum at +25°C. The MAX4649 is available in a tiny 8-pin SOT23 package.
The MAX4649 is a dual‑supply, single‑pole/double‑throw (SPDT) analog switch that handles rail‑to‑rail signals. It is offered in a compact 8‑pin SOT‑23 package and is used in telecommunications, test equipment, audio systems and other signal‑routing applications.
Key features include a low on‑resistance of 45 Ω max, operation from a single +9 V to +36 V supply or dual ±4.5 V to ±20 V supplies, fast transition time (130 ns max), low off‑leakage (2 nA max) and high off‑isolation (‑92 dB at 1 MHz). The datasheet details absolute maximum ratings, electrical characteristics, dynamic behavior, pin functions and typical test circuits.
| On‑Resistance (RON) max | 45 Ω |
|---|---|
| Single‑supply voltage range | +9 V to +36 V |
| Transition time (max) | 130 ns |
| Off‑leakage current (max) | 2 nA |
| On‑leakage current (typical) | <20 pA |
| Crosstalk (1 MHz) | -92 dB |
| Off‑isolation (1 MHz) | -92 dB |
The MAX4649 has a maximum on‑resistance of 45 Ω.
It can operate from a single +9 V to +36 V supply or from dual ±4.5 V to ±20 V supplies.
The switch transition time is up to 130 ns maximum.
Off‑leakage current is limited to 2 nA maximum.