MAX381/MAX383/MAX385 are precision, low-voltage analog switches. The single-pole single-throw MAX381 and double-pole single-throw MAX385 dual switches are normally open. The single-pole double-throw MAX383 has two normally open and two normally closed poles. All three parts offer low on-resistance (less than 35Ω), guaranteed to match to within 2Ω between channels and to remain flat over the specified analog signal range (4Ω max). They also offer low leak- age (less than 250pA at +25°C and less than 2.5nA at +85°C) and fast switching (turn-on time less than 175ns and turn-off time less than 100ns). The MAX381/MAX383/MAX385 are fabricated with Maxim’s low-voltage silicon-gate process for high sys- tem accuracy. Design improvements guarantee extremely low charge injection (<5pC) and low power consumption (<10µW). These monolithic switches operate with a single posi- tive supply (+3V to +15V) or with split supplies (±3V to ±8V) while retaining CMOS-logic input compatibility and fast switching. CMOS inputs provide reduced input loading.
The MAX381, MAX383, and MAX385 are precision low‑voltage analog switches offered by Maxim. They are single‑pole single‑throw (MAX381), double‑pole single‑throw (MAX385), and single‑pole double‑throw (MAX383) devices with low on‑resistance and low leakage.
These switches support single‑supply operation from +3 V to +15 V or bipolar supplies from ±3 V to ±8 V, provide fast switching (<175 ns turn‑on, <100 ns turn‑off), and consume less than 10 µW, making them suitable for sample‑and‑hold circuits, military radios, test equipment, and other applications.
| On‑Resistance (typical) | 20 Ω |
|---|---|
| On‑Resistance (maximum) | <35 Ω |
| Off‑Leakage Current (max at +25 °C) | <250 pA |
| Turn‑On Time | <175 ns |
| Turn‑Off Time | <100 ns |
| Supply Voltage (single) | +3 V to +15 V |
| Power Consumption | <10 µW |
The typical on‑resistance is 20 Ω (with a maximum of 35 Ω).
The off‑leakage current is less than 250 pA at +25 °C.