HEF4066BT Quad Bilateral CMOS Analog Switch, SMD SOP
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Prices updated: 13 Oct 2026
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About this product
The HEF4066BT is a quad single-pole, single-throw CMOS bilateral analog switch. Each switch has two input/output terminals and an active-high enable input. Its inputs include clamp diodes, which allow current-limiting resistors when a signal goes above the supply voltage. It is used for signal routing and analog multiplexing.
Specifications
- Switches per package
- 4 (SPST)
- Enable input
- Active HIGH
- Input clamp diodes
- Yes
- Supply voltage
- 3 V to 15 V
- Package
- SMD SOP
Frequently asked questions
Can I switch signals that exceed the supply voltage?
The inputs have clamp diodes, so a current-limiting resistor can be used when a signal goes above VDD. For normal operation, keep the signal within the supply rails.
How do I enable or disable a switch?
Drive the enable input HIGH to turn the switch on; when it is LOW, the switch is off. Tie unused enable inputs to a defined logic level rather than leaving them floating.
