The NC7SB3257 is a high performance 2:1 NMOS switch from Fairchild Semiconductor Corporation with space saving and low impedance features
The NC7SB3257 is a 2:1 NMOS pass‑gate multiplexer/demultiplexer designed for operation from 4.0 V to 5.5 V. It features a low on‑resistance, TTL‑compatible control input, and over‑voltage tolerance up to 7.0 V. The device is offered in a space‑saving SC70 6‑lead surface‑mount package and an ultra‑small lead‑less MicroPak package.
Key electrical characteristics include a typical on‑resistance of about 3 Ω at 5 V, a propagation delay of 0.25 ns, break‑before‑make timing of 0.5 ns, quiescent supply current of 10 µA, and a maximum power dissipation of 180 mW at +85 °C. Detailed pin assignments, ordering codes, and mechanical dimensions are provided for both package types.
| Operating Voltage (VCC) | 4.0 V to 5.5 V |
|---|---|
| Control Input Overvoltage Tolerance | 7.0 V |
| Typical On‑Resistance | ≈3 Ω @ 5.0 V |
| Maximum Power Dissipation | 180 mW @ +85 °C |
| Package Options | SC70 6‑lead and MicroPak lead‑less |
| Package Options | SC70 6‑lead and MicroPak lead‑less |
The device is specified to operate from 4.0 V to 5.5 V.
The control input can tolerate voltages up to 7.0 V.
It is offered in a space‑saving SC70 6‑lead surface‑mount package and an ultra‑small MicroPak lead‑less package.
The part can dissipate up to 180 mW at +85 °C.